diff --git a/modules/openapi-generator/src/main/resources/Java/jackson_annotations.mustache b/modules/openapi-generator/src/main/resources/Java/jackson_annotations.mustache
index 4fbaf983be8d..18804d0a444b 100644
--- a/modules/openapi-generator/src/main/resources/Java/jackson_annotations.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/jackson_annotations.mustache
@@ -4,7 +4,7 @@
  * If the field is required, always include it, even if it is null.
  * Else use custom behaviour, IOW use whatever is defined on the object mapper
  }}
-  @JsonProperty(JSON_PROPERTY_{{nameInSnakeCase}})
+  @JsonProperty(value = JSON_PROPERTY_{{nameInSnakeCase}}, required = {{required}})
   @JsonInclude({{#isMap}}{{#items.isNullable}}content = JsonInclude.Include.ALWAYS, {{/items.isNullable}}{{/isMap}}value = JsonInclude.Include.{{#required}}ALWAYS{{/required}}{{^required}}USE_DEFAULTS{{/required}})
 {{#withXml}}
   @JacksonXmlProperty(localName = "{{items.xmlName}}{{^items.xmlName}}{{xmlName}}{{^xmlName}}{{baseName}}{{/xmlName}}{{/items.xmlName}}"{{#isXmlAttribute}}, isAttribute = true{{/isXmlAttribute}}{{#xmlNamespace}}, namespace = "{{.}}"{{/xmlNamespace}})
diff --git a/modules/openapi-generator/src/main/resources/Java/pojo.mustache b/modules/openapi-generator/src/main/resources/Java/pojo.mustache
index 09482dd66e66..a679d3374ecb 100644
--- a/modules/openapi-generator/src/main/resources/Java/pojo.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/pojo.mustache
@@ -108,7 +108,7 @@ public class {{classname}} {{#parent}}extends {{{.}}} {{/parent}}{{#vendorExtens
   {{#jsonb}}@JsonbCreator{{/jsonb}}{{#jackson}}@JsonCreator{{/jackson}}
   public {{classname}}(
   {{#readOnlyVars}}
-    {{#jsonb}}@JsonbProperty(value = "{{baseName}}"{{^required}}, nullable = true{{/required}}){{/jsonb}}{{#jackson}}@JsonProperty(JSON_PROPERTY_{{nameInSnakeCase}}){{/jackson}} {{{datatypeWithEnum}}} {{name}}{{^-last}}, {{/-last}}
+    {{#jsonb}}@JsonbProperty(value = "{{baseName}}"{{^required}}, nullable = true{{/required}}){{/jsonb}}{{#jackson}}@JsonProperty(value = JSON_PROPERTY_{{nameInSnakeCase}}, required = {{required}}){{/jackson}} {{{datatypeWithEnum}}} {{name}}{{^-last}}, {{/-last}}
   {{/readOnlyVars}}
   ) {
     this();
@@ -123,7 +123,7 @@ public class {{classname}} {{#parent}}extends {{{.}}} {{/parent}}{{#vendorExtens
   /**
    * Constructor with all args parameters
    */
-  public {{classname}}({{#vendorExtensions.x-java-all-args-constructor-vars}}{{#jsonb}}@JsonbProperty(value = "{{baseName}}"{{^required}}, nullable = true{{/required}}){{/jsonb}}{{#jackson}}@JsonProperty(JSON_PROPERTY_{{nameInSnakeCase}}){{/jackson}} {{{datatypeWithEnum}}} {{name}}{{^-last}}, {{/-last}}{{/vendorExtensions.x-java-all-args-constructor-vars}}) {
+  public {{classname}}({{#vendorExtensions.x-java-all-args-constructor-vars}}{{#jsonb}}@JsonbProperty(value = "{{baseName}}"{{^required}}, nullable = true{{/required}}){{/jsonb}}{{#jackson}}@JsonProperty(value = JSON_PROPERTY_{{nameInSnakeCase}}, required = {{required}}){{/jackson}} {{{datatypeWithEnum}}} {{name}}{{^-last}}, {{/-last}}{{/vendorExtensions.x-java-all-args-constructor-vars}}) {
 {{#parent}}
     super({{#parentVars}}{{name}}{{^-last}}, {{/-last}}{{/parentVars}});
 {{/parent}}
@@ -252,7 +252,7 @@ public class {{classname}} {{#parent}}extends {{{.}}} {{/parent}}{{#vendorExtens
     return {{name}};
   }
   {{/vendorExtensions.x-is-jackson-optional-nullable}}{{#vendorExtensions.x-is-jackson-optional-nullable}}
-  @JsonProperty(JSON_PROPERTY_{{nameInSnakeCase}})
+  @JsonProperty(value = JSON_PROPERTY_{{nameInSnakeCase}}, required = {{required}})
   {{#isReadOnly}}private{{/isReadOnly}}{{^isReadOnly}}public{{/isReadOnly}} void {{setter}}_JsonNullable(JsonNullable<{{{datatypeWithEnum}}}> {{name}}) {
     {{! For getters/setters that have name differing from attribute name, we must include setter (albeit private) for jackson to be able to set the attribute}}
     this.{{name}} = {{name}};
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/JavaClientCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/JavaClientCodegenTest.java
index e5e14d46851d..a29b780c86dc 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/JavaClientCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/JavaClientCodegenTest.java
@@ -2099,10 +2099,10 @@ public void testDeprecatedPropertyJersey3() {
         TestUtils.assertFileContains(
                 output.resolve("src/main/java/org/openapitools/client/model/BigDog.java"),
                 "@Deprecated\n public BigDog declawed(@jakarta.annotation.Nullable Boolean declawed) {", // deprecated builder method
-                "@Deprecated\n @jakarta.annotation.Nullable\n @JsonProperty(JSON_PROPERTY_DECLAWED)\n"
+                "@Deprecated\n @jakarta.annotation.Nullable\n @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)\n"
                         + " @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)\n\n"
                         + " public Boolean getDeclawed() {", // deprecated getter
-                "@Deprecated\n @JsonProperty(JSON_PROPERTY_DECLAWED)\n"
+                "@Deprecated\n @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)\n"
                         + " @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)\n"
                         + " public void setDeclawed(@jakarta.annotation.Nullable Boolean declawed) {" // deprecated setter
         );
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Bird.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Bird.java
index bad50ebf15c7..b42be78ca655 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Bird.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Bird.java
@@ -57,7 +57,7 @@ public Bird size(@javax.annotation.Nullable String size) {
    * @return size
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSize() {
@@ -65,7 +65,7 @@ public String getSize() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSize(@javax.annotation.Nullable String size) {
     this.size = size;
@@ -82,7 +82,7 @@ public Bird color(@javax.annotation.Nullable String color) {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -90,7 +90,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Category.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Category.java
index 3a38d3a3bb78..e16924c79f9b 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Category.java
@@ -57,7 +57,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -65,7 +65,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -82,7 +82,7 @@ public Category name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -90,7 +90,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/DataQuery.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/DataQuery.java
index d66bfb24c911..d73cae47ac81 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/DataQuery.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/DataQuery.java
@@ -68,7 +68,7 @@ public DataQuery suffix(@javax.annotation.Nullable String suffix) {
    * @return suffix
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SUFFIX)
+  @JsonProperty(value = JSON_PROPERTY_SUFFIX, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSuffix() {
@@ -76,7 +76,7 @@ public String getSuffix() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SUFFIX)
+  @JsonProperty(value = JSON_PROPERTY_SUFFIX, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSuffix(@javax.annotation.Nullable String suffix) {
     this.suffix = suffix;
@@ -93,7 +93,7 @@ public DataQuery text(@javax.annotation.Nullable String text) {
    * @return text
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TEXT)
+  @JsonProperty(value = JSON_PROPERTY_TEXT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getText() {
@@ -101,7 +101,7 @@ public String getText() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TEXT)
+  @JsonProperty(value = JSON_PROPERTY_TEXT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setText(@javax.annotation.Nullable String text) {
     this.text = text;
@@ -118,7 +118,7 @@ public DataQuery date(@javax.annotation.Nullable OffsetDateTime date) {
    * @return date
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDate() {
@@ -126,7 +126,7 @@ public OffsetDateTime getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDate(@javax.annotation.Nullable OffsetDateTime date) {
     this.date = date;
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/DefaultValue.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/DefaultValue.java
index faf0905ed3ec..092b62f89676 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/DefaultValue.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/DefaultValue.java
@@ -140,7 +140,7 @@ public DefaultValue addArrayStringEnumRefDefaultItem(StringEnumRef arrayStringEn
    * @return arrayStringEnumRefDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<StringEnumRef> getArrayStringEnumRefDefault() {
@@ -148,7 +148,7 @@ public List<StringEnumRef> getArrayStringEnumRefDefault() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringEnumRefDefault(@javax.annotation.Nullable List<StringEnumRef> arrayStringEnumRefDefault) {
     this.arrayStringEnumRefDefault = arrayStringEnumRefDefault;
@@ -173,7 +173,7 @@ public DefaultValue addArrayStringEnumDefaultItem(ArrayStringEnumDefaultEnum arr
    * @return arrayStringEnumDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayStringEnumDefaultEnum> getArrayStringEnumDefault() {
@@ -181,7 +181,7 @@ public List<ArrayStringEnumDefaultEnum> getArrayStringEnumDefault() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringEnumDefault(@javax.annotation.Nullable List<ArrayStringEnumDefaultEnum> arrayStringEnumDefault) {
     this.arrayStringEnumDefault = arrayStringEnumDefault;
@@ -206,7 +206,7 @@ public DefaultValue addArrayStringDefaultItem(String arrayStringDefaultItem) {
    * @return arrayStringDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayStringDefault() {
@@ -214,7 +214,7 @@ public List<String> getArrayStringDefault() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringDefault(@javax.annotation.Nullable List<String> arrayStringDefault) {
     this.arrayStringDefault = arrayStringDefault;
@@ -239,7 +239,7 @@ public DefaultValue addArrayIntegerDefaultItem(Integer arrayIntegerDefaultItem)
    * @return arrayIntegerDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_INTEGER_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_INTEGER_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getArrayIntegerDefault() {
@@ -247,7 +247,7 @@ public List<Integer> getArrayIntegerDefault() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_INTEGER_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_INTEGER_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayIntegerDefault(@javax.annotation.Nullable List<Integer> arrayIntegerDefault) {
     this.arrayIntegerDefault = arrayIntegerDefault;
@@ -272,7 +272,7 @@ public DefaultValue addArrayStringItem(String arrayStringItem) {
    * @return arrayString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayString() {
@@ -280,7 +280,7 @@ public List<String> getArrayString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayString(@javax.annotation.Nullable List<String> arrayString) {
     this.arrayString = arrayString;
@@ -315,14 +315,14 @@ public List<String> getArrayStringNullable() {
         return arrayStringNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<String>> getArrayStringNullable_JsonNullable() {
     return arrayStringNullable;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_NULLABLE, required = false)
   public void setArrayStringNullable_JsonNullable(JsonNullable<List<String>> arrayStringNullable) {
     this.arrayStringNullable = arrayStringNullable;
   }
@@ -360,14 +360,14 @@ public List<String> getArrayStringExtensionNullable() {
         return arrayStringExtensionNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<String>> getArrayStringExtensionNullable_JsonNullable() {
     return arrayStringExtensionNullable;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE, required = false)
   public void setArrayStringExtensionNullable_JsonNullable(JsonNullable<List<String>> arrayStringExtensionNullable) {
     this.arrayStringExtensionNullable = arrayStringExtensionNullable;
   }
@@ -393,14 +393,14 @@ public String getStringNullable() {
         return stringNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_STRING_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringNullable_JsonNullable() {
     return stringNullable;
   }
   
-  @JsonProperty(JSON_PROPERTY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_STRING_NULLABLE, required = false)
   public void setStringNullable_JsonNullable(JsonNullable<String> stringNullable) {
     this.stringNullable = stringNullable;
   }
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
index d2f2dbe848a5..a3b63c87e323 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
@@ -63,7 +63,7 @@ public NumberPropertiesOnly number(@javax.annotation.Nullable BigDecimal number)
    * @return number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNumber() {
@@ -71,7 +71,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNumber(@javax.annotation.Nullable BigDecimal number) {
     this.number = number;
@@ -88,7 +88,7 @@ public NumberPropertiesOnly _float(@javax.annotation.Nullable Float _float) {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -96,7 +96,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -115,7 +115,7 @@ public NumberPropertiesOnly _double(@javax.annotation.Nullable Double _double) {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -123,7 +123,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Pet.java
index 62a88d10805e..5b6bccc30e97 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Pet.java
@@ -119,7 +119,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -127,7 +127,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -144,7 +144,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -152,7 +152,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -169,7 +169,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -177,7 +177,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -202,7 +202,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -210,7 +210,7 @@ public List<String> getPhotoUrls() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -235,7 +235,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -243,7 +243,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -260,7 +260,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -268,7 +268,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Query.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Query.java
index 49738aa20f9d..ad3e23d7958c 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Query.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Query.java
@@ -97,7 +97,7 @@ public Query id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -105,7 +105,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -130,7 +130,7 @@ public Query addOutcomesItem(OutcomesEnum outcomesItem) {
    * @return outcomes
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTCOMES)
+  @JsonProperty(value = JSON_PROPERTY_OUTCOMES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<OutcomesEnum> getOutcomes() {
@@ -138,7 +138,7 @@ public List<OutcomesEnum> getOutcomes() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTCOMES)
+  @JsonProperty(value = JSON_PROPERTY_OUTCOMES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOutcomes(@javax.annotation.Nullable List<OutcomesEnum> outcomes) {
     this.outcomes = outcomes;
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Tag.java
index 69e8a3044a19..0124efe85dd2 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Tag.java
@@ -57,7 +57,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -65,7 +65,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -82,7 +82,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -90,7 +90,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
index 9b269756b5b3..aa8efc7f3800 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
@@ -53,7 +53,7 @@ public TestFormObjectMultipartRequestMarker name(@javax.annotation.Nullable Stri
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -61,7 +61,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
index 80dad71f8674..21886f92684d 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
@@ -68,7 +68,7 @@ public TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter size(@
    * @return size
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSize() {
@@ -76,7 +76,7 @@ public String getSize() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSize(@javax.annotation.Nullable String size) {
     this.size = size;
@@ -93,7 +93,7 @@ public TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter color(
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -101,7 +101,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
@@ -118,7 +118,7 @@ public TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter id(@ja
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -126,7 +126,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -143,7 +143,7 @@ public TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter name(@
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -151,7 +151,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
index 4ff771455907..5791085e5a1c 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
@@ -64,7 +64,7 @@ public TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter addValuesIte
    * @return values
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_VALUES)
+  @JsonProperty(value = JSON_PROPERTY_VALUES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getValues() {
@@ -72,7 +72,7 @@ public List<String> getValues() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUES)
+  @JsonProperty(value = JSON_PROPERTY_VALUES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setValues(@javax.annotation.Nullable List<String> values) {
     this.values = values;
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Bird.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Bird.java
index 952048db1f6c..13f45ef10b63 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Bird.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Bird.java
@@ -59,14 +59,14 @@ public Bird size(@javax.annotation.Nullable String size) {
    * @return size
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSize() {
     return size;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSize(@javax.annotation.Nullable String size) {
     this.size = size;
@@ -83,14 +83,14 @@ public Bird color(@javax.annotation.Nullable String color) {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getColor() {
     return color;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Category.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Category.java
index d1ab4d0d52e3..b24aefc0e515 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Category.java
@@ -59,14 +59,14 @@ public Category id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -83,14 +83,14 @@ public Category name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/DataQuery.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/DataQuery.java
index e559ed31f4ca..09b3ff2e89fd 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/DataQuery.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/DataQuery.java
@@ -68,14 +68,14 @@ public DataQuery suffix(@javax.annotation.Nullable String suffix) {
    * @return suffix
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SUFFIX)
+  @JsonProperty(value = JSON_PROPERTY_SUFFIX, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSuffix() {
     return suffix;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SUFFIX)
+  @JsonProperty(value = JSON_PROPERTY_SUFFIX, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSuffix(@javax.annotation.Nullable String suffix) {
     this.suffix = suffix;
@@ -92,14 +92,14 @@ public DataQuery text(@javax.annotation.Nullable String text) {
    * @return text
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TEXT)
+  @JsonProperty(value = JSON_PROPERTY_TEXT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getText() {
     return text;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TEXT)
+  @JsonProperty(value = JSON_PROPERTY_TEXT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setText(@javax.annotation.Nullable String text) {
     this.text = text;
@@ -116,14 +116,14 @@ public DataQuery date(@javax.annotation.Nullable Instant date) {
    * @return date
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Instant getDate() {
     return date;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDate(@javax.annotation.Nullable Instant date) {
     this.date = date;
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/DefaultValue.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/DefaultValue.java
index c5cd8d523cae..25b8ca38a7ce 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/DefaultValue.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/DefaultValue.java
@@ -138,14 +138,14 @@ public DefaultValue addArrayStringEnumRefDefaultItem(StringEnumRef arrayStringEn
    * @return arrayStringEnumRefDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<StringEnumRef> getArrayStringEnumRefDefault() {
     return arrayStringEnumRefDefault;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringEnumRefDefault(@javax.annotation.Nullable List<StringEnumRef> arrayStringEnumRefDefault) {
     this.arrayStringEnumRefDefault = arrayStringEnumRefDefault;
@@ -170,14 +170,14 @@ public DefaultValue addArrayStringEnumDefaultItem(ArrayStringEnumDefaultEnum arr
    * @return arrayStringEnumDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<ArrayStringEnumDefaultEnum> getArrayStringEnumDefault() {
     return arrayStringEnumDefault;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringEnumDefault(@javax.annotation.Nullable List<ArrayStringEnumDefaultEnum> arrayStringEnumDefault) {
     this.arrayStringEnumDefault = arrayStringEnumDefault;
@@ -202,14 +202,14 @@ public DefaultValue addArrayStringDefaultItem(String arrayStringDefaultItem) {
    * @return arrayStringDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<String> getArrayStringDefault() {
     return arrayStringDefault;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringDefault(@javax.annotation.Nullable List<String> arrayStringDefault) {
     this.arrayStringDefault = arrayStringDefault;
@@ -234,14 +234,14 @@ public DefaultValue addArrayIntegerDefaultItem(Integer arrayIntegerDefaultItem)
    * @return arrayIntegerDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_INTEGER_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_INTEGER_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Integer> getArrayIntegerDefault() {
     return arrayIntegerDefault;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_INTEGER_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_INTEGER_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayIntegerDefault(@javax.annotation.Nullable List<Integer> arrayIntegerDefault) {
     this.arrayIntegerDefault = arrayIntegerDefault;
@@ -266,14 +266,14 @@ public DefaultValue addArrayStringItem(String arrayStringItem) {
    * @return arrayString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<String> getArrayString() {
     return arrayString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayString(@javax.annotation.Nullable List<String> arrayString) {
     this.arrayString = arrayString;
@@ -307,7 +307,7 @@ public List<String> getArrayStringNullable() {
         return arrayStringNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<String>> getArrayStringNullable_JsonNullable() {
@@ -351,7 +351,7 @@ public List<String> getArrayStringExtensionNullable() {
         return arrayStringExtensionNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<String>> getArrayStringExtensionNullable_JsonNullable() {
@@ -383,7 +383,7 @@ public String getStringNullable() {
         return stringNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_STRING_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringNullable_JsonNullable() {
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
index 997f916ab134..3f064e63980c 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
@@ -65,14 +65,14 @@ public NumberPropertiesOnly number(@javax.annotation.Nullable BigDecimal number)
    * @return number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getNumber() {
     return number;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNumber(@javax.annotation.Nullable BigDecimal number) {
     this.number = number;
@@ -89,14 +89,14 @@ public NumberPropertiesOnly _float(@javax.annotation.Nullable Float _float) {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Float getFloat() {
     return _float;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -115,14 +115,14 @@ public NumberPropertiesOnly _double(@javax.annotation.Nullable Double _double) {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Double getDouble() {
     return _double;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Pet.java
index a7b2446cc66c..cd65fb6c19b5 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,14 +120,14 @@ public Pet id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -144,14 +144,14 @@ public Pet name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -168,14 +168,14 @@ public Pet category(@javax.annotation.Nullable Category category) {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Category getCategory() {
     return category;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -200,14 +200,14 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public List<String> getPhotoUrls() {
     return photoUrls;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -232,14 +232,14 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Tag> getTags() {
     return tags;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -256,14 +256,14 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Query.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Query.java
index fd12ebb0a490..eed14d22bcfc 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Query.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Query.java
@@ -98,14 +98,14 @@ public Query id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -130,14 +130,14 @@ public Query addOutcomesItem(OutcomesEnum outcomesItem) {
    * @return outcomes
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTCOMES)
+  @JsonProperty(value = JSON_PROPERTY_OUTCOMES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<OutcomesEnum> getOutcomes() {
     return outcomes;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTCOMES)
+  @JsonProperty(value = JSON_PROPERTY_OUTCOMES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOutcomes(@javax.annotation.Nullable List<OutcomesEnum> outcomes) {
     this.outcomes = outcomes;
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Tag.java
index d3f25353a7bf..6e2258078f00 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Tag.java
@@ -59,14 +59,14 @@ public Tag id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -83,14 +83,14 @@ public Tag name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
index ef42cd6ca37c..43ba6dda37e9 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
@@ -54,14 +54,14 @@ public TestFormObjectMultipartRequestMarker name(@javax.annotation.Nullable Stri
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
index 7a561c7b486b..d1cc4ca0f9a8 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
@@ -69,14 +69,14 @@ public TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter size(@
    * @return size
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSize() {
     return size;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSize(@javax.annotation.Nullable String size) {
     this.size = size;
@@ -93,14 +93,14 @@ public TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter color(
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getColor() {
     return color;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
@@ -117,14 +117,14 @@ public TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter id(@ja
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -141,14 +141,14 @@ public TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter name(@
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
index d47fca975d3b..f56627374050 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
@@ -64,14 +64,14 @@ public TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter addValuesIte
    * @return values
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_VALUES)
+  @JsonProperty(value = JSON_PROPERTY_VALUES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<String> getValues() {
     return values;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUES)
+  @JsonProperty(value = JSON_PROPERTY_VALUES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setValues(@javax.annotation.Nullable List<String> values) {
     this.values = values;
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Bird.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Bird.java
index 5f5430d8a633..db4e1246e5bb 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Bird.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Bird.java
@@ -54,7 +54,7 @@ public Bird size(@jakarta.annotation.Nullable String size) {
    * @return size
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSize() {
@@ -62,7 +62,7 @@ public String getSize() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSize(@jakarta.annotation.Nullable String size) {
     this.size = size;
@@ -79,7 +79,7 @@ public Bird color(@jakarta.annotation.Nullable String color) {
    * @return color
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -87,7 +87,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@jakarta.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Category.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Category.java
index edf14f76134f..28eeb7f9c58a 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Category.java
@@ -54,7 +54,7 @@ public Category id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Category name(@jakarta.annotation.Nullable String name) {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/DataQuery.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/DataQuery.java
index 4b10be53fd7f..8322d181e513 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/DataQuery.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/DataQuery.java
@@ -65,7 +65,7 @@ public DataQuery suffix(@jakarta.annotation.Nullable String suffix) {
    * @return suffix
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SUFFIX)
+  @JsonProperty(value = JSON_PROPERTY_SUFFIX, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSuffix() {
@@ -73,7 +73,7 @@ public String getSuffix() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SUFFIX)
+  @JsonProperty(value = JSON_PROPERTY_SUFFIX, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSuffix(@jakarta.annotation.Nullable String suffix) {
     this.suffix = suffix;
@@ -90,7 +90,7 @@ public DataQuery text(@jakarta.annotation.Nullable String text) {
    * @return text
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TEXT)
+  @JsonProperty(value = JSON_PROPERTY_TEXT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getText() {
@@ -98,7 +98,7 @@ public String getText() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TEXT)
+  @JsonProperty(value = JSON_PROPERTY_TEXT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setText(@jakarta.annotation.Nullable String text) {
     this.text = text;
@@ -115,7 +115,7 @@ public DataQuery date(@jakarta.annotation.Nullable Instant date) {
    * @return date
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Instant getDate() {
@@ -123,7 +123,7 @@ public Instant getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDate(@jakarta.annotation.Nullable Instant date) {
     this.date = date;
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/DefaultValue.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/DefaultValue.java
index a815fe5be0d9..241fd7523b4a 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/DefaultValue.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/DefaultValue.java
@@ -137,7 +137,7 @@ public DefaultValue addArrayStringEnumRefDefaultItem(StringEnumRef arrayStringEn
    * @return arrayStringEnumRefDefault
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<StringEnumRef> getArrayStringEnumRefDefault() {
@@ -145,7 +145,7 @@ public List<StringEnumRef> getArrayStringEnumRefDefault() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringEnumRefDefault(@jakarta.annotation.Nullable List<StringEnumRef> arrayStringEnumRefDefault) {
     this.arrayStringEnumRefDefault = arrayStringEnumRefDefault;
@@ -170,7 +170,7 @@ public DefaultValue addArrayStringEnumDefaultItem(ArrayStringEnumDefaultEnum arr
    * @return arrayStringEnumDefault
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayStringEnumDefaultEnum> getArrayStringEnumDefault() {
@@ -178,7 +178,7 @@ public List<ArrayStringEnumDefaultEnum> getArrayStringEnumDefault() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringEnumDefault(@jakarta.annotation.Nullable List<ArrayStringEnumDefaultEnum> arrayStringEnumDefault) {
     this.arrayStringEnumDefault = arrayStringEnumDefault;
@@ -203,7 +203,7 @@ public DefaultValue addArrayStringDefaultItem(String arrayStringDefaultItem) {
    * @return arrayStringDefault
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayStringDefault() {
@@ -211,7 +211,7 @@ public List<String> getArrayStringDefault() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringDefault(@jakarta.annotation.Nullable List<String> arrayStringDefault) {
     this.arrayStringDefault = arrayStringDefault;
@@ -236,7 +236,7 @@ public DefaultValue addArrayIntegerDefaultItem(Integer arrayIntegerDefaultItem)
    * @return arrayIntegerDefault
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_INTEGER_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_INTEGER_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getArrayIntegerDefault() {
@@ -244,7 +244,7 @@ public List<Integer> getArrayIntegerDefault() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_INTEGER_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_INTEGER_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayIntegerDefault(@jakarta.annotation.Nullable List<Integer> arrayIntegerDefault) {
     this.arrayIntegerDefault = arrayIntegerDefault;
@@ -269,7 +269,7 @@ public DefaultValue addArrayStringItem(String arrayStringItem) {
    * @return arrayString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayString() {
@@ -277,7 +277,7 @@ public List<String> getArrayString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayString(@jakarta.annotation.Nullable List<String> arrayString) {
     this.arrayString = arrayString;
@@ -312,14 +312,14 @@ public List<String> getArrayStringNullable() {
         return arrayStringNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<String>> getArrayStringNullable_JsonNullable() {
     return arrayStringNullable;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_NULLABLE, required = false)
   public void setArrayStringNullable_JsonNullable(JsonNullable<List<String>> arrayStringNullable) {
     this.arrayStringNullable = arrayStringNullable;
   }
@@ -357,14 +357,14 @@ public List<String> getArrayStringExtensionNullable() {
         return arrayStringExtensionNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<String>> getArrayStringExtensionNullable_JsonNullable() {
     return arrayStringExtensionNullable;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE, required = false)
   public void setArrayStringExtensionNullable_JsonNullable(JsonNullable<List<String>> arrayStringExtensionNullable) {
     this.arrayStringExtensionNullable = arrayStringExtensionNullable;
   }
@@ -390,14 +390,14 @@ public String getStringNullable() {
         return stringNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_STRING_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringNullable_JsonNullable() {
     return stringNullable;
   }
   
-  @JsonProperty(JSON_PROPERTY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_STRING_NULLABLE, required = false)
   public void setStringNullable_JsonNullable(JsonNullable<String> stringNullable) {
     this.stringNullable = stringNullable;
   }
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
index 0e7d4b48e789..a3d87dcc7f48 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
@@ -60,7 +60,7 @@ public NumberPropertiesOnly number(@jakarta.annotation.Nullable BigDecimal numbe
    * @return number
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNumber() {
@@ -68,7 +68,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNumber(@jakarta.annotation.Nullable BigDecimal number) {
     this.number = number;
@@ -85,7 +85,7 @@ public NumberPropertiesOnly _float(@jakarta.annotation.Nullable Float _float) {
    * @return _float
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -93,7 +93,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@jakarta.annotation.Nullable Float _float) {
     this._float = _float;
@@ -112,7 +112,7 @@ public NumberPropertiesOnly _double(@jakarta.annotation.Nullable Double _double)
    * @return _double
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -120,7 +120,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@jakarta.annotation.Nullable Double _double) {
     this._double = _double;
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Pet.java
index 800af3fd0a0a..7e8a30effacf 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Pet.java
@@ -116,7 +116,7 @@ public Pet id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -124,7 +124,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -141,7 +141,7 @@ public Pet name(@jakarta.annotation.Nonnull String name) {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -149,7 +149,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
@@ -166,7 +166,7 @@ public Pet category(@jakarta.annotation.Nullable Category category) {
    * @return category
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -174,7 +174,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@jakarta.annotation.Nullable Category category) {
     this.category = category;
@@ -199,7 +199,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -207,7 +207,7 @@ public List<String> getPhotoUrls() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@jakarta.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -232,7 +232,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -240,7 +240,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@jakarta.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -257,7 +257,7 @@ public Pet status(@jakarta.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -265,7 +265,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Query.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Query.java
index 0e5c8a6f9cae..c077351b5375 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Query.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Query.java
@@ -94,7 +94,7 @@ public Query id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -102,7 +102,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -127,7 +127,7 @@ public Query addOutcomesItem(OutcomesEnum outcomesItem) {
    * @return outcomes
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTCOMES)
+  @JsonProperty(value = JSON_PROPERTY_OUTCOMES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<OutcomesEnum> getOutcomes() {
@@ -135,7 +135,7 @@ public List<OutcomesEnum> getOutcomes() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTCOMES)
+  @JsonProperty(value = JSON_PROPERTY_OUTCOMES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOutcomes(@jakarta.annotation.Nullable List<OutcomesEnum> outcomes) {
     this.outcomes = outcomes;
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Tag.java
index 72cd3c4517cb..90f634ac389c 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Tag.java
@@ -54,7 +54,7 @@ public Tag id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Tag name(@jakarta.annotation.Nullable String name) {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
index a1a457a85a8b..24fcb7b8c899 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
@@ -50,7 +50,7 @@ public TestFormObjectMultipartRequestMarker name(@jakarta.annotation.Nullable St
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -58,7 +58,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
index b4490fb324e7..4535fc99eac2 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
@@ -65,7 +65,7 @@ public TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter size(@
    * @return size
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSize() {
@@ -73,7 +73,7 @@ public String getSize() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSize(@jakarta.annotation.Nullable String size) {
     this.size = size;
@@ -90,7 +90,7 @@ public TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter color(
    * @return color
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -98,7 +98,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@jakarta.annotation.Nullable String color) {
     this.color = color;
@@ -115,7 +115,7 @@ public TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter id(@ja
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -123,7 +123,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -140,7 +140,7 @@ public TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter name(@
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -148,7 +148,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
index b41d959691bc..ee1cda1d4d30 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
@@ -61,7 +61,7 @@ public TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter addValuesIte
    * @return values
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_VALUES)
+  @JsonProperty(value = JSON_PROPERTY_VALUES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getValues() {
@@ -69,7 +69,7 @@ public List<String> getValues() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUES)
+  @JsonProperty(value = JSON_PROPERTY_VALUES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setValues(@jakarta.annotation.Nullable List<String> values) {
     this.values = values;
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Bird.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Bird.java
index 58de59cea6c4..38c2b54d87cd 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Bird.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Bird.java
@@ -54,7 +54,7 @@ public Bird size(@javax.annotation.Nullable String size) {
    * @return size
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSize() {
@@ -62,7 +62,7 @@ public String getSize() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSize(@javax.annotation.Nullable String size) {
     this.size = size;
@@ -79,7 +79,7 @@ public Bird color(@javax.annotation.Nullable String color) {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -87,7 +87,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Category.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Category.java
index f1a7381a7ee3..287218ded692 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Category.java
@@ -54,7 +54,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Category name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/DataQuery.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/DataQuery.java
index 8921838944e7..4d4320084ffa 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/DataQuery.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/DataQuery.java
@@ -65,7 +65,7 @@ public DataQuery suffix(@javax.annotation.Nullable String suffix) {
    * @return suffix
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SUFFIX)
+  @JsonProperty(value = JSON_PROPERTY_SUFFIX, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSuffix() {
@@ -73,7 +73,7 @@ public String getSuffix() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SUFFIX)
+  @JsonProperty(value = JSON_PROPERTY_SUFFIX, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSuffix(@javax.annotation.Nullable String suffix) {
     this.suffix = suffix;
@@ -90,7 +90,7 @@ public DataQuery text(@javax.annotation.Nullable String text) {
    * @return text
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TEXT)
+  @JsonProperty(value = JSON_PROPERTY_TEXT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getText() {
@@ -98,7 +98,7 @@ public String getText() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TEXT)
+  @JsonProperty(value = JSON_PROPERTY_TEXT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setText(@javax.annotation.Nullable String text) {
     this.text = text;
@@ -115,7 +115,7 @@ public DataQuery date(@javax.annotation.Nullable OffsetDateTime date) {
    * @return date
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDate() {
@@ -123,7 +123,7 @@ public OffsetDateTime getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDate(@javax.annotation.Nullable OffsetDateTime date) {
     this.date = date;
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/DefaultValue.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/DefaultValue.java
index f190793d4624..a7dba7d1b56f 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/DefaultValue.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/DefaultValue.java
@@ -137,7 +137,7 @@ public DefaultValue addArrayStringEnumRefDefaultItem(StringEnumRef arrayStringEn
    * @return arrayStringEnumRefDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<StringEnumRef> getArrayStringEnumRefDefault() {
@@ -145,7 +145,7 @@ public List<StringEnumRef> getArrayStringEnumRefDefault() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringEnumRefDefault(@javax.annotation.Nullable List<StringEnumRef> arrayStringEnumRefDefault) {
     this.arrayStringEnumRefDefault = arrayStringEnumRefDefault;
@@ -170,7 +170,7 @@ public DefaultValue addArrayStringEnumDefaultItem(ArrayStringEnumDefaultEnum arr
    * @return arrayStringEnumDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayStringEnumDefaultEnum> getArrayStringEnumDefault() {
@@ -178,7 +178,7 @@ public List<ArrayStringEnumDefaultEnum> getArrayStringEnumDefault() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringEnumDefault(@javax.annotation.Nullable List<ArrayStringEnumDefaultEnum> arrayStringEnumDefault) {
     this.arrayStringEnumDefault = arrayStringEnumDefault;
@@ -203,7 +203,7 @@ public DefaultValue addArrayStringDefaultItem(String arrayStringDefaultItem) {
    * @return arrayStringDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayStringDefault() {
@@ -211,7 +211,7 @@ public List<String> getArrayStringDefault() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringDefault(@javax.annotation.Nullable List<String> arrayStringDefault) {
     this.arrayStringDefault = arrayStringDefault;
@@ -236,7 +236,7 @@ public DefaultValue addArrayIntegerDefaultItem(Integer arrayIntegerDefaultItem)
    * @return arrayIntegerDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_INTEGER_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_INTEGER_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getArrayIntegerDefault() {
@@ -244,7 +244,7 @@ public List<Integer> getArrayIntegerDefault() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_INTEGER_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_INTEGER_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayIntegerDefault(@javax.annotation.Nullable List<Integer> arrayIntegerDefault) {
     this.arrayIntegerDefault = arrayIntegerDefault;
@@ -269,7 +269,7 @@ public DefaultValue addArrayStringItem(String arrayStringItem) {
    * @return arrayString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayString() {
@@ -277,7 +277,7 @@ public List<String> getArrayString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayString(@javax.annotation.Nullable List<String> arrayString) {
     this.arrayString = arrayString;
@@ -312,14 +312,14 @@ public List<String> getArrayStringNullable() {
         return arrayStringNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<String>> getArrayStringNullable_JsonNullable() {
     return arrayStringNullable;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_NULLABLE, required = false)
   public void setArrayStringNullable_JsonNullable(JsonNullable<List<String>> arrayStringNullable) {
     this.arrayStringNullable = arrayStringNullable;
   }
@@ -357,14 +357,14 @@ public List<String> getArrayStringExtensionNullable() {
         return arrayStringExtensionNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<String>> getArrayStringExtensionNullable_JsonNullable() {
     return arrayStringExtensionNullable;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE, required = false)
   public void setArrayStringExtensionNullable_JsonNullable(JsonNullable<List<String>> arrayStringExtensionNullable) {
     this.arrayStringExtensionNullable = arrayStringExtensionNullable;
   }
@@ -390,14 +390,14 @@ public String getStringNullable() {
         return stringNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_STRING_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringNullable_JsonNullable() {
     return stringNullable;
   }
   
-  @JsonProperty(JSON_PROPERTY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_STRING_NULLABLE, required = false)
   public void setStringNullable_JsonNullable(JsonNullable<String> stringNullable) {
     this.stringNullable = stringNullable;
   }
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
index 0532611c93b4..ec44db1fdfa1 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
@@ -60,7 +60,7 @@ public NumberPropertiesOnly number(@javax.annotation.Nullable BigDecimal number)
    * @return number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNumber() {
@@ -68,7 +68,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNumber(@javax.annotation.Nullable BigDecimal number) {
     this.number = number;
@@ -85,7 +85,7 @@ public NumberPropertiesOnly _float(@javax.annotation.Nullable Float _float) {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -93,7 +93,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -112,7 +112,7 @@ public NumberPropertiesOnly _double(@javax.annotation.Nullable Double _double) {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -120,7 +120,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Pet.java
index 39ac0b8062c8..e0f0f0469c36 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Pet.java
@@ -116,7 +116,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -124,7 +124,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -141,7 +141,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -149,7 +149,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -166,7 +166,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -174,7 +174,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -199,7 +199,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -207,7 +207,7 @@ public List<String> getPhotoUrls() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -232,7 +232,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -240,7 +240,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -257,7 +257,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -265,7 +265,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Query.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Query.java
index 98269da87273..3b08a450d938 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Query.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Query.java
@@ -94,7 +94,7 @@ public Query id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -102,7 +102,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -127,7 +127,7 @@ public Query addOutcomesItem(OutcomesEnum outcomesItem) {
    * @return outcomes
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTCOMES)
+  @JsonProperty(value = JSON_PROPERTY_OUTCOMES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<OutcomesEnum> getOutcomes() {
@@ -135,7 +135,7 @@ public List<OutcomesEnum> getOutcomes() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTCOMES)
+  @JsonProperty(value = JSON_PROPERTY_OUTCOMES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOutcomes(@javax.annotation.Nullable List<OutcomesEnum> outcomes) {
     this.outcomes = outcomes;
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Tag.java
index 601456b75a41..15e9dca19976 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Tag.java
@@ -54,7 +54,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
index d9569c36a933..abb3441ff8f9 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
@@ -50,7 +50,7 @@ public TestFormObjectMultipartRequestMarker name(@javax.annotation.Nullable Stri
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -58,7 +58,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
index 4c030f3b4428..f7e75bb1ec9d 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
@@ -65,7 +65,7 @@ public TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter size(@
    * @return size
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSize() {
@@ -73,7 +73,7 @@ public String getSize() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSize(@javax.annotation.Nullable String size) {
     this.size = size;
@@ -90,7 +90,7 @@ public TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter color(
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -98,7 +98,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
@@ -115,7 +115,7 @@ public TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter id(@ja
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -123,7 +123,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -140,7 +140,7 @@ public TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter name(@
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -148,7 +148,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
index d59905deeafe..31164a9dbb69 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
@@ -61,7 +61,7 @@ public TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter addValuesIte
    * @return values
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_VALUES)
+  @JsonProperty(value = JSON_PROPERTY_VALUES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getValues() {
@@ -69,7 +69,7 @@ public List<String> getValues() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUES)
+  @JsonProperty(value = JSON_PROPERTY_VALUES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setValues(@javax.annotation.Nullable List<String> values) {
     this.values = values;
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Bird.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Bird.java
index b0bff402914e..895435850701 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Bird.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Bird.java
@@ -54,7 +54,7 @@ public Bird size(@javax.annotation.Nullable String size) {
    * @return size
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSize() {
@@ -62,7 +62,7 @@ public String getSize() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSize(@javax.annotation.Nullable String size) {
     this.size = size;
@@ -79,7 +79,7 @@ public Bird color(@javax.annotation.Nullable String color) {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -87,7 +87,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Category.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Category.java
index c32f0beeb0ee..595e2adac9e7 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Category.java
@@ -54,7 +54,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Category name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/DataQuery.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/DataQuery.java
index 4154ec8ead89..5046b2256a8c 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/DataQuery.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/DataQuery.java
@@ -65,7 +65,7 @@ public DataQuery suffix(@javax.annotation.Nullable String suffix) {
    * @return suffix
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SUFFIX)
+  @JsonProperty(value = JSON_PROPERTY_SUFFIX, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSuffix() {
@@ -73,7 +73,7 @@ public String getSuffix() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SUFFIX)
+  @JsonProperty(value = JSON_PROPERTY_SUFFIX, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSuffix(@javax.annotation.Nullable String suffix) {
     this.suffix = suffix;
@@ -90,7 +90,7 @@ public DataQuery text(@javax.annotation.Nullable String text) {
    * @return text
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TEXT)
+  @JsonProperty(value = JSON_PROPERTY_TEXT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getText() {
@@ -98,7 +98,7 @@ public String getText() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TEXT)
+  @JsonProperty(value = JSON_PROPERTY_TEXT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setText(@javax.annotation.Nullable String text) {
     this.text = text;
@@ -115,7 +115,7 @@ public DataQuery date(@javax.annotation.Nullable OffsetDateTime date) {
    * @return date
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDate() {
@@ -123,7 +123,7 @@ public OffsetDateTime getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDate(@javax.annotation.Nullable OffsetDateTime date) {
     this.date = date;
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/DefaultValue.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/DefaultValue.java
index 84e752040fb8..4d65057997eb 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/DefaultValue.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/DefaultValue.java
@@ -137,7 +137,7 @@ public DefaultValue addArrayStringEnumRefDefaultItem(StringEnumRef arrayStringEn
    * @return arrayStringEnumRefDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<StringEnumRef> getArrayStringEnumRefDefault() {
@@ -145,7 +145,7 @@ public List<StringEnumRef> getArrayStringEnumRefDefault() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringEnumRefDefault(@javax.annotation.Nullable List<StringEnumRef> arrayStringEnumRefDefault) {
     this.arrayStringEnumRefDefault = arrayStringEnumRefDefault;
@@ -170,7 +170,7 @@ public DefaultValue addArrayStringEnumDefaultItem(ArrayStringEnumDefaultEnum arr
    * @return arrayStringEnumDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayStringEnumDefaultEnum> getArrayStringEnumDefault() {
@@ -178,7 +178,7 @@ public List<ArrayStringEnumDefaultEnum> getArrayStringEnumDefault() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringEnumDefault(@javax.annotation.Nullable List<ArrayStringEnumDefaultEnum> arrayStringEnumDefault) {
     this.arrayStringEnumDefault = arrayStringEnumDefault;
@@ -203,7 +203,7 @@ public DefaultValue addArrayStringDefaultItem(String arrayStringDefaultItem) {
    * @return arrayStringDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayStringDefault() {
@@ -211,7 +211,7 @@ public List<String> getArrayStringDefault() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringDefault(@javax.annotation.Nullable List<String> arrayStringDefault) {
     this.arrayStringDefault = arrayStringDefault;
@@ -236,7 +236,7 @@ public DefaultValue addArrayIntegerDefaultItem(Integer arrayIntegerDefaultItem)
    * @return arrayIntegerDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_INTEGER_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_INTEGER_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getArrayIntegerDefault() {
@@ -244,7 +244,7 @@ public List<Integer> getArrayIntegerDefault() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_INTEGER_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_INTEGER_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayIntegerDefault(@javax.annotation.Nullable List<Integer> arrayIntegerDefault) {
     this.arrayIntegerDefault = arrayIntegerDefault;
@@ -269,7 +269,7 @@ public DefaultValue addArrayStringItem(String arrayStringItem) {
    * @return arrayString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayString() {
@@ -277,7 +277,7 @@ public List<String> getArrayString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayString(@javax.annotation.Nullable List<String> arrayString) {
     this.arrayString = arrayString;
@@ -312,7 +312,7 @@ public List<String> getArrayStringNullable() {
         return arrayStringNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<String>> getArrayStringNullable_JsonNullable() {
@@ -357,7 +357,7 @@ public List<String> getArrayStringExtensionNullable() {
         return arrayStringExtensionNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<String>> getArrayStringExtensionNullable_JsonNullable() {
@@ -390,7 +390,7 @@ public String getStringNullable() {
         return stringNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_STRING_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringNullable_JsonNullable() {
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
index 5d3a6388cb46..0f4a90d1394d 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
@@ -60,7 +60,7 @@ public NumberPropertiesOnly number(@javax.annotation.Nullable BigDecimal number)
    * @return number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNumber() {
@@ -68,7 +68,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNumber(@javax.annotation.Nullable BigDecimal number) {
     this.number = number;
@@ -85,7 +85,7 @@ public NumberPropertiesOnly _float(@javax.annotation.Nullable Float _float) {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -93,7 +93,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -112,7 +112,7 @@ public NumberPropertiesOnly _double(@javax.annotation.Nullable Double _double) {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -120,7 +120,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Pet.java
index 69f31506c1fa..2091a5b30de9 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Pet.java
@@ -116,7 +116,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -124,7 +124,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -141,7 +141,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -149,7 +149,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -166,7 +166,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -174,7 +174,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -199,7 +199,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -207,7 +207,7 @@ public List<String> getPhotoUrls() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -232,7 +232,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -240,7 +240,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -257,7 +257,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -265,7 +265,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Query.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Query.java
index 34b61e9d4c32..67270322b0dd 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Query.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Query.java
@@ -94,7 +94,7 @@ public Query id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -102,7 +102,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -127,7 +127,7 @@ public Query addOutcomesItem(OutcomesEnum outcomesItem) {
    * @return outcomes
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTCOMES)
+  @JsonProperty(value = JSON_PROPERTY_OUTCOMES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<OutcomesEnum> getOutcomes() {
@@ -135,7 +135,7 @@ public List<OutcomesEnum> getOutcomes() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTCOMES)
+  @JsonProperty(value = JSON_PROPERTY_OUTCOMES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOutcomes(@javax.annotation.Nullable List<OutcomesEnum> outcomes) {
     this.outcomes = outcomes;
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Tag.java
index bf02627dea7b..549b09ec658b 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Tag.java
@@ -54,7 +54,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
index d182192713bf..18d1da8b057b 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
@@ -50,7 +50,7 @@ public TestFormObjectMultipartRequestMarker name(@javax.annotation.Nullable Stri
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -58,7 +58,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
index 11180e0dbaf3..c3cf31e02223 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
@@ -65,7 +65,7 @@ public TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter size(@
    * @return size
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSize() {
@@ -73,7 +73,7 @@ public String getSize() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSize(@javax.annotation.Nullable String size) {
     this.size = size;
@@ -90,7 +90,7 @@ public TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter color(
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -98,7 +98,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
@@ -115,7 +115,7 @@ public TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter id(@ja
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -123,7 +123,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -140,7 +140,7 @@ public TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter name(@
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -148,7 +148,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
index 9c24e5d881a8..7d33a34f1c9c 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
@@ -61,7 +61,7 @@ public TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter addValuesIte
    * @return values
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_VALUES)
+  @JsonProperty(value = JSON_PROPERTY_VALUES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getValues() {
@@ -69,7 +69,7 @@ public List<String> getValues() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUES)
+  @JsonProperty(value = JSON_PROPERTY_VALUES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setValues(@javax.annotation.Nullable List<String> values) {
     this.values = values;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 016b9e07e58e..1672526606e9 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -67,7 +67,7 @@ public AdditionalPropertiesClass putMapPropertyItem(String key, String mapProper
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -75,7 +75,7 @@ public Map<String, String> getMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -100,7 +100,7 @@ public AdditionalPropertiesClass putMapOfMapPropertyItem(String key, Map<String,
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -108,7 +108,7 @@ public Map<String, Map<String, String>> getMapOfMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index a0469d606a18..c6a0948cc355 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -58,7 +58,7 @@ public AllOfWithSingleRef username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -66,7 +66,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -83,7 +83,7 @@ public AllOfWithSingleRef singleRefType(@javax.annotation.Nullable SingleRefType
    * @return singleRefType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -91,7 +91,7 @@ public SingleRefType getSingleRefType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@javax.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Animal.java
index bc57685b88ac..61dd6eee9897 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Animal.java
@@ -70,7 +70,7 @@ public Animal className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -78,7 +78,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -95,7 +95,7 @@ public Animal color(@javax.annotation.Nullable String color) {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -103,7 +103,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 6f526173bfff..17633b2c4c86 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -64,7 +64,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -72,7 +72,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index bc672a68b2b4..c0546a749c03 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -64,7 +64,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -72,7 +72,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayTest.java
index 6cf8ddbc53f2..44ff0b364135 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -74,7 +74,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -82,7 +82,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -107,7 +107,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -115,7 +115,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -140,7 +140,7 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -148,7 +148,7 @@ public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Capitalization.java
index dc276e44f966..ec185f5401d0 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -77,7 +77,7 @@ public Capitalization smallCamel(@javax.annotation.Nullable String smallCamel) {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -85,7 +85,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -102,7 +102,7 @@ public Capitalization capitalCamel(@javax.annotation.Nullable String capitalCame
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -110,7 +110,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -127,7 +127,7 @@ public Capitalization smallSnake(@javax.annotation.Nullable String smallSnake) {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -135,7 +135,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -152,7 +152,7 @@ public Capitalization capitalSnake(@javax.annotation.Nullable String capitalSnak
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -160,7 +160,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -177,7 +177,7 @@ public Capitalization scAETHFlowPoints(@javax.annotation.Nullable String scAETHF
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -185,7 +185,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -202,7 +202,7 @@ public Capitalization ATT_NAME(@javax.annotation.Nullable String ATT_NAME) {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -210,7 +210,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Cat.java
index e1d6d36c1e6b..d828accf63b8 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Cat.java
@@ -63,7 +63,7 @@ public Cat declawed(@javax.annotation.Nullable Boolean declawed) {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -71,7 +71,7 @@ public Boolean getDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Category.java
index a6163f8554c1..37ee7b16ed50 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Category.java
@@ -57,7 +57,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -65,7 +65,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -82,7 +82,7 @@ public Category name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -90,7 +90,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index 74ee2eda0f19..019afa3c4228 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -64,7 +64,7 @@ public ChildWithNullable otherProperty(@javax.annotation.Nullable String otherPr
    * @return otherProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -72,7 +72,7 @@ public String getOtherProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@javax.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ClassModel.java
index 80c3fb0cc647..1fd2be0a8d49 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -52,7 +52,7 @@ public ClassModel propertyClass(@javax.annotation.Nullable String propertyClass)
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -60,7 +60,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Client.java
index b2a4f1783cdb..b44c6392dfd8 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Client.java
@@ -52,7 +52,7 @@ public Client client(@javax.annotation.Nullable String client) {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -60,7 +60,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 5f9de31a37bc..005fc644fe5d 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -54,7 +54,7 @@ public DeprecatedObject name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -62,7 +62,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Dog.java
index 6cccc86bf755..6d4679645471 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Dog.java
@@ -63,7 +63,7 @@ public Dog breed(@javax.annotation.Nullable String breed) {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -71,7 +71,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/EnumArrays.java
index f8bff2efa329..93394d2c47a1 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -130,7 +130,7 @@ public EnumArrays justSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbo
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -138,7 +138,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -163,7 +163,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -171,7 +171,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/EnumTest.java
index 504f423a3a09..6d4947baea18 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -240,7 +240,7 @@ public EnumTest enumString(@javax.annotation.Nullable EnumStringEnum enumString)
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -248,7 +248,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -265,7 +265,7 @@ public EnumTest enumStringRequired(@javax.annotation.Nonnull EnumStringRequiredE
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -273,7 +273,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -290,7 +290,7 @@ public EnumTest enumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteg
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -298,7 +298,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -315,7 +315,7 @@ public EnumTest enumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber)
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -323,7 +323,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -346,14 +346,14 @@ public OuterEnum getOuterEnum() {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
     return outerEnum;
   }
   
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   public void setOuterEnum_JsonNullable(JsonNullable<OuterEnum> outerEnum) {
     this.outerEnum = outerEnum;
   }
@@ -373,7 +373,7 @@ public EnumTest outerEnumInteger(@javax.annotation.Nullable OuterEnumInteger out
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -381,7 +381,7 @@ public OuterEnumInteger getOuterEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -398,7 +398,7 @@ public EnumTest outerEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaul
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -406,7 +406,7 @@ public OuterEnumDefaultValue getOuterEnumDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -423,7 +423,7 @@ public EnumTest outerEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnu
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -431,7 +431,7 @@ public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 130092678f20..187e5d9c569a 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -61,7 +61,7 @@ public FakeBigDecimalMap200Response someId(@javax.annotation.Nullable BigDecimal
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -69,7 +69,7 @@ public BigDecimal getSomeId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -94,7 +94,7 @@ public FakeBigDecimalMap200Response putSomeMapItem(String key, BigDecimal someMa
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -102,7 +102,7 @@ public Map<String, BigDecimal> getSomeMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 0a1402ee3387..a9da27ece4d3 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -61,7 +61,7 @@ public FileSchemaTestClass _file(@javax.annotation.Nullable ModelFile _file) {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -69,7 +69,7 @@ public ModelFile getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -94,7 +94,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -102,7 +102,7 @@ public List<ModelFile> getFiles() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Foo.java
index f0e10e283f3b..2d8b7350a17e 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Foo.java
@@ -52,7 +52,7 @@ public Foo bar(@javax.annotation.Nullable String bar) {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -60,7 +60,7 @@ public String getBar() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index f8f35d4dc613..bb49c9f0fe39 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -54,7 +54,7 @@ public FooGetDefaultResponse string(@javax.annotation.Nullable Foo string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -62,7 +62,7 @@ public Foo getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FormatTest.java
index 50ef15c5380d..43066ec2153c 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -135,7 +135,7 @@ public FormatTest integer(@javax.annotation.Nullable Integer integer) {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -143,7 +143,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -162,7 +162,7 @@ public FormatTest int32(@javax.annotation.Nullable Integer int32) {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -170,7 +170,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -187,7 +187,7 @@ public FormatTest int64(@javax.annotation.Nullable Long int64) {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -195,7 +195,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -214,7 +214,7 @@ public FormatTest number(@javax.annotation.Nonnull BigDecimal number) {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -222,7 +222,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -241,7 +241,7 @@ public FormatTest _float(@javax.annotation.Nullable Float _float) {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -249,7 +249,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -268,7 +268,7 @@ public FormatTest _double(@javax.annotation.Nullable Double _double) {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -276,7 +276,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -293,7 +293,7 @@ public FormatTest decimal(@javax.annotation.Nullable BigDecimal decimal) {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -301,7 +301,7 @@ public BigDecimal getDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -318,7 +318,7 @@ public FormatTest string(@javax.annotation.Nullable String string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -326,7 +326,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -343,7 +343,7 @@ public FormatTest _byte(@javax.annotation.Nonnull byte[] _byte) {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -351,7 +351,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -368,7 +368,7 @@ public FormatTest binary(@javax.annotation.Nullable File binary) {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -376,7 +376,7 @@ public File getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -393,7 +393,7 @@ public FormatTest date(@javax.annotation.Nonnull LocalDate date) {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -401,7 +401,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -418,7 +418,7 @@ public FormatTest dateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -426,7 +426,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -443,7 +443,7 @@ public FormatTest uuid(@javax.annotation.Nullable UUID uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -451,7 +451,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -468,7 +468,7 @@ public FormatTest password(@javax.annotation.Nonnull String password) {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -476,7 +476,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -493,7 +493,7 @@ public FormatTest patternWithDigits(@javax.annotation.Nullable String patternWit
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -501,7 +501,7 @@ public String getPatternWithDigits() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -518,7 +518,7 @@ public FormatTest patternWithDigitsAndDelimiter(@javax.annotation.Nullable Strin
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -526,7 +526,7 @@ public String getPatternWithDigitsAndDelimiter() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 794b775e3a0a..4e2734b4dc15 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -51,8 +51,8 @@ public HasOnlyReadOnly() {
    */
   @JsonCreator
   public HasOnlyReadOnly(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar, 
-    @JsonProperty(JSON_PROPERTY_FOO) String foo
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar, 
+    @JsonProperty(value = JSON_PROPERTY_FOO, required = false) String foo
   ) {
     this();
     this.bar = bar;
@@ -64,7 +64,7 @@ public HasOnlyReadOnly(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -78,7 +78,7 @@ public String getBar() {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 05f5ac0fe7d9..3d8cfdb9f3ae 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -62,14 +62,14 @@ public String getNullableMessage() {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
     return nullableMessage;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   public void setNullableMessage_JsonNullable(JsonNullable<String> nullableMessage) {
     this.nullableMessage = nullableMessage;
   }
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/MapTest.java
index 12f7191e2a10..1959e58ce3ad 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/MapTest.java
@@ -112,7 +112,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -120,7 +120,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -145,7 +145,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -153,7 +153,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -178,7 +178,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -186,7 +186,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -211,7 +211,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -219,7 +219,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 843048c3ee44..fd94bae70dd7 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -67,7 +67,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@javax.annotation.Nullab
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -75,7 +75,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -92,7 +92,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@javax.annotation.Nu
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -100,7 +100,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -125,7 +125,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -133,7 +133,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Model200Response.java
index af0ee0ec46fe..bc3ac3849a27 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -58,7 +58,7 @@ public Model200Response name(@javax.annotation.Nullable Integer name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -66,7 +66,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -83,7 +83,7 @@ public Model200Response propertyClass(@javax.annotation.Nullable String property
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -91,7 +91,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 4fa9c99aea88..c0e0aab8ee8c 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -63,7 +63,7 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -71,7 +71,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -88,7 +88,7 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -96,7 +96,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -113,7 +113,7 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -121,7 +121,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelFile.java
index 14d5b4b4fc05..ed260fc9e5db 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -53,7 +53,7 @@ public ModelFile sourceURI(@javax.annotation.Nullable String sourceURI) {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -61,7 +61,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelList.java
index 2ad85d7b4a24..69e83c7e8b63 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelList.java
@@ -53,7 +53,7 @@ public ModelList _123list(@javax.annotation.Nullable String _123list) {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -61,7 +61,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelReturn.java
index 41cbdd20f7ba..cbf6971740c2 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -53,7 +53,7 @@ public ModelReturn _return(@javax.annotation.Nullable Integer _return) {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -61,7 +61,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Name.java
index 05cf4e462973..e3523d511a43 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Name.java
@@ -60,8 +60,8 @@ public Name() {
    */
   @JsonCreator
   public Name(
-    @JsonProperty(JSON_PROPERTY_SNAKE_CASE) Integer snakeCase, 
-    @JsonProperty(JSON_PROPERTY_123NUMBER) Integer _123number
+    @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false) Integer snakeCase, 
+    @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false) Integer _123number
   ) {
     this();
     this.snakeCase = snakeCase;
@@ -79,7 +79,7 @@ public Name name(@javax.annotation.Nonnull Integer name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -87,7 +87,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -98,7 +98,7 @@ public void setName(@javax.annotation.Nonnull Integer name) {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -118,7 +118,7 @@ public Name property(@javax.annotation.Nullable String property) {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -126,7 +126,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -137,7 +137,7 @@ public void setProperty(@javax.annotation.Nullable String property) {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/NullableClass.java
index c79b9563ff52..1e354cb3a173 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -126,14 +126,14 @@ public Integer getIntegerProp() {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
     return integerProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   public void setIntegerProp_JsonNullable(JsonNullable<Integer> integerProp) {
     this.integerProp = integerProp;
   }
@@ -159,14 +159,14 @@ public BigDecimal getNumberProp() {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
     return numberProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   public void setNumberProp_JsonNullable(JsonNullable<BigDecimal> numberProp) {
     this.numberProp = numberProp;
   }
@@ -192,14 +192,14 @@ public Boolean getBooleanProp() {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
     return booleanProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   public void setBooleanProp_JsonNullable(JsonNullable<Boolean> booleanProp) {
     this.booleanProp = booleanProp;
   }
@@ -225,14 +225,14 @@ public String getStringProp() {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
     return stringProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   public void setStringProp_JsonNullable(JsonNullable<String> stringProp) {
     this.stringProp = stringProp;
   }
@@ -258,14 +258,14 @@ public LocalDate getDateProp() {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
     return dateProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   public void setDateProp_JsonNullable(JsonNullable<LocalDate> dateProp) {
     this.dateProp = dateProp;
   }
@@ -291,14 +291,14 @@ public OffsetDateTime getDatetimeProp() {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
     return datetimeProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   public void setDatetimeProp_JsonNullable(JsonNullable<OffsetDateTime> datetimeProp) {
     this.datetimeProp = datetimeProp;
   }
@@ -336,14 +336,14 @@ public List<Object> getArrayNullableProp() {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
     return arrayNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   public void setArrayNullableProp_JsonNullable(JsonNullable<List<Object>> arrayNullableProp) {
     this.arrayNullableProp = arrayNullableProp;
   }
@@ -381,14 +381,14 @@ public List<Object> getArrayAndItemsNullableProp() {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
     return arrayAndItemsNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   public void setArrayAndItemsNullableProp_JsonNullable(JsonNullable<List<Object>> arrayAndItemsNullableProp) {
     this.arrayAndItemsNullableProp = arrayAndItemsNullableProp;
   }
@@ -416,7 +416,7 @@ public NullableClass addArrayItemsNullableItem(Object arrayItemsNullableItem) {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -424,7 +424,7 @@ public List<Object> getArrayItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -459,14 +459,14 @@ public Map<String, Object> getObjectNullableProp() {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
     return objectNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   public void setObjectNullableProp_JsonNullable(JsonNullable<Map<String, Object>> objectNullableProp) {
     this.objectNullableProp = objectNullableProp;
   }
@@ -504,14 +504,14 @@ public Map<String, Object> getObjectAndItemsNullableProp() {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
     return objectAndItemsNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   public void setObjectAndItemsNullableProp_JsonNullable(JsonNullable<Map<String, Object>> objectAndItemsNullableProp) {
     this.objectAndItemsNullableProp = objectAndItemsNullableProp;
   }
@@ -539,7 +539,7 @@ public NullableClass putObjectItemsNullableItem(String key, Object objectItemsNu
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -547,7 +547,7 @@ public Map<String, Object> getObjectItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/NumberOnly.java
index 8f93c8865f2e..2ad040080427 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -53,7 +53,7 @@ public NumberOnly justNumber(@javax.annotation.Nullable BigDecimal justNumber) {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -61,7 +61,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 8048b889afde..7d1c69147dec 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -72,7 +72,7 @@ public ObjectWithDeprecatedFields uuid(@javax.annotation.Nullable String uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -80,7 +80,7 @@ public String getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -99,7 +99,7 @@ public ObjectWithDeprecatedFields id(@javax.annotation.Nullable BigDecimal id) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -107,7 +107,7 @@ public BigDecimal getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -126,7 +126,7 @@ public ObjectWithDeprecatedFields deprecatedRef(@javax.annotation.Nullable Depre
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -134,7 +134,7 @@ public DeprecatedObject getDeprecatedRef() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -161,7 +161,7 @@ public ObjectWithDeprecatedFields addBarsItem(String barsItem) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -169,7 +169,7 @@ public List<String> getBars() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Order.java
index ecc9fedf1b12..e09f17ec6a6b 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Order.java
@@ -115,7 +115,7 @@ public Order id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -123,7 +123,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -140,7 +140,7 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -148,7 +148,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -165,7 +165,7 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -173,7 +173,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -190,7 +190,7 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -198,7 +198,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -215,7 +215,7 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -223,7 +223,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -240,7 +240,7 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -248,7 +248,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/OuterComposite.java
index 730caa95d0f3..3772e6e982b9 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -63,7 +63,7 @@ public OuterComposite myNumber(@javax.annotation.Nullable BigDecimal myNumber) {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -71,7 +71,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -88,7 +88,7 @@ public OuterComposite myString(@javax.annotation.Nullable String myString) {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -96,7 +96,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -113,7 +113,7 @@ public OuterComposite myBoolean(@javax.annotation.Nullable Boolean myBoolean) {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -121,7 +121,7 @@ public Boolean getMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 23bb3f8bad2c..ce1f14349edd 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -53,7 +53,7 @@ public OuterObjectWithEnumProperty value(@javax.annotation.Nonnull OuterEnumInte
    * @return value
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -61,7 +61,7 @@ public OuterEnumInteger getValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@javax.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index 39c62b47ec44..3c40db1de484 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -106,7 +106,7 @@ public ParentWithNullable type(@javax.annotation.Nullable TypeEnum type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -114,7 +114,7 @@ public TypeEnum getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -137,14 +137,14 @@ public String getNullableProperty() {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
     return nullableProperty;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   public void setNullableProperty_JsonNullable(JsonNullable<String> nullableProperty) {
     this.nullableProperty = nullableProperty;
   }
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Pet.java
index 7a766ce1af8d..f08af75093bf 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Pet.java
@@ -122,7 +122,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -130,7 +130,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -147,7 +147,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -155,7 +155,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -172,7 +172,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -180,7 +180,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -205,7 +205,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -214,7 +214,7 @@ public Set<String> getPhotoUrls() {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -239,7 +239,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -247,7 +247,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -264,7 +264,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -272,7 +272,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 7440db0676c0..c752cb32877b 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -50,7 +50,7 @@ public ReadOnlyFirst() {
    */
   @JsonCreator
   public ReadOnlyFirst(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar
   ) {
     this();
     this.bar = bar;
@@ -61,7 +61,7 @@ public ReadOnlyFirst(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -81,7 +81,7 @@ public ReadOnlyFirst baz(@javax.annotation.Nullable String baz) {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -89,7 +89,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/SpecialModelName.java
index f9de607561af..6394a00144fb 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -53,7 +53,7 @@ public SpecialModelName() {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -61,7 +61,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Tag.java
index bb1ca8c42501..ab95e21cd654 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Tag.java
@@ -57,7 +57,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -65,7 +65,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -82,7 +82,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -90,7 +90,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 063aa4f489be..354ae3450548 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -56,7 +56,7 @@ public TestInlineFreeformAdditionalPropertiesRequest someProperty(@javax.annotat
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -64,7 +64,7 @@ public String getSomeProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/User.java
index 17e9de4a30c9..3a1a9c5a71db 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/User.java
@@ -87,7 +87,7 @@ public User id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -95,7 +95,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -112,7 +112,7 @@ public User username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -120,7 +120,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -137,7 +137,7 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -145,7 +145,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -162,7 +162,7 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -170,7 +170,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -187,7 +187,7 @@ public User email(@javax.annotation.Nullable String email) {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -195,7 +195,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -212,7 +212,7 @@ public User password(@javax.annotation.Nullable String password) {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -220,7 +220,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -237,7 +237,7 @@ public User phone(@javax.annotation.Nullable String phone) {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -245,7 +245,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -262,7 +262,7 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -270,7 +270,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
index 380c0c8629f5..07d07fe8fa22 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
@@ -59,7 +59,7 @@ public AdditionalPropertiesAnyType name(@javax.annotation.Nullable String name)
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -67,7 +67,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
index 39e42455040c..2e298acc0b7c 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
@@ -60,7 +60,7 @@ public AdditionalPropertiesArray name(@javax.annotation.Nullable String name) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -68,7 +68,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
index 05b74f72eaa1..590c562ba9bb 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
@@ -59,7 +59,7 @@ public AdditionalPropertiesBoolean name(@javax.annotation.Nullable String name)
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -67,7 +67,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 4bfbb29a8600..e15dbc523596 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -117,7 +117,7 @@ public AdditionalPropertiesClass putMapStringItem(String key, String mapStringIt
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapString() {
@@ -125,7 +125,7 @@ public Map<String, String> getMapString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapString(@javax.annotation.Nullable Map<String, String> mapString) {
     this.mapString = mapString;
@@ -152,7 +152,7 @@ public AdditionalPropertiesClass putMapNumberItem(String key, BigDecimal mapNumb
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getMapNumber() {
@@ -160,7 +160,7 @@ public Map<String, BigDecimal> getMapNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapNumber(@javax.annotation.Nullable Map<String, BigDecimal> mapNumber) {
     this.mapNumber = mapNumber;
@@ -187,7 +187,7 @@ public AdditionalPropertiesClass putMapIntegerItem(String key, Integer mapIntege
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Integer> getMapInteger() {
@@ -195,7 +195,7 @@ public Map<String, Integer> getMapInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapInteger(@javax.annotation.Nullable Map<String, Integer> mapInteger) {
     this.mapInteger = mapInteger;
@@ -222,7 +222,7 @@ public AdditionalPropertiesClass putMapBooleanItem(String key, Boolean mapBoolea
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getMapBoolean() {
@@ -230,7 +230,7 @@ public Map<String, Boolean> getMapBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapBoolean(@javax.annotation.Nullable Map<String, Boolean> mapBoolean) {
     this.mapBoolean = mapBoolean;
@@ -257,7 +257,7 @@ public AdditionalPropertiesClass putMapArrayIntegerItem(String key, List<Integer
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Integer>> getMapArrayInteger() {
@@ -265,7 +265,7 @@ public Map<String, List<Integer>> getMapArrayInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayInteger(@javax.annotation.Nullable Map<String, List<Integer>> mapArrayInteger) {
     this.mapArrayInteger = mapArrayInteger;
@@ -292,7 +292,7 @@ public AdditionalPropertiesClass putMapArrayAnytypeItem(String key, List<Object>
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Object>> getMapArrayAnytype() {
@@ -300,7 +300,7 @@ public Map<String, List<Object>> getMapArrayAnytype() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayAnytype(@javax.annotation.Nullable Map<String, List<Object>> mapArrayAnytype) {
     this.mapArrayAnytype = mapArrayAnytype;
@@ -327,7 +327,7 @@ public AdditionalPropertiesClass putMapMapStringItem(String key, Map<String, Str
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapString() {
@@ -335,7 +335,7 @@ public Map<String, Map<String, String>> getMapMapString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapString) {
     this.mapMapString = mapMapString;
@@ -362,7 +362,7 @@ public AdditionalPropertiesClass putMapMapAnytypeItem(String key, Map<String, Ob
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, Object>> getMapMapAnytype() {
@@ -370,7 +370,7 @@ public Map<String, Map<String, Object>> getMapMapAnytype() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapAnytype(@javax.annotation.Nullable Map<String, Map<String, Object>> mapMapAnytype) {
     this.mapMapAnytype = mapMapAnytype;
@@ -389,7 +389,7 @@ public AdditionalPropertiesClass anytype1(@javax.annotation.Nullable Object anyt
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype1() {
@@ -397,7 +397,7 @@ public Object getAnytype1() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype1(@javax.annotation.Nullable Object anytype1) {
     this.anytype1 = anytype1;
@@ -416,7 +416,7 @@ public AdditionalPropertiesClass anytype2(@javax.annotation.Nullable Object anyt
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype2() {
@@ -424,7 +424,7 @@ public Object getAnytype2() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype2(@javax.annotation.Nullable Object anytype2) {
     this.anytype2 = anytype2;
@@ -443,7 +443,7 @@ public AdditionalPropertiesClass anytype3(@javax.annotation.Nullable Object anyt
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype3() {
@@ -451,7 +451,7 @@ public Object getAnytype3() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype3(@javax.annotation.Nullable Object anytype3) {
     this.anytype3 = anytype3;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
index 13a636cb8b60..af5a7bcd30b1 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
@@ -59,7 +59,7 @@ public AdditionalPropertiesInteger name(@javax.annotation.Nullable String name)
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -67,7 +67,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
index 915d36189555..4049186038f8 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
@@ -60,7 +60,7 @@ public AdditionalPropertiesNumber name(@javax.annotation.Nullable String name) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -68,7 +68,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
index ac48d57fd6d8..151d2999cbcc 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
@@ -60,7 +60,7 @@ public AdditionalPropertiesObject name(@javax.annotation.Nullable String name) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -68,7 +68,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
index bb87f2143212..2d57c9832ff0 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
@@ -59,7 +59,7 @@ public AdditionalPropertiesString name(@javax.annotation.Nullable String name) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -67,7 +67,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Animal.java
index 0759174d4176..3075fd0d2e0e 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Animal.java
@@ -74,7 +74,7 @@ public Animal className(@javax.annotation.Nonnull String className) {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -82,7 +82,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -101,7 +101,7 @@ public Animal color(@javax.annotation.Nullable String color) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -109,7 +109,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index ef6066b0d6c2..9a040e7383d8 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -67,7 +67,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -75,7 +75,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 7491a2565ab7..f7373afcfbe5 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -67,7 +67,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -75,7 +75,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayTest.java
index 9b9567181a61..d6747a6cfbad 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -77,7 +77,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -85,7 +85,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -112,7 +112,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -120,7 +120,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -147,7 +147,7 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -155,7 +155,7 @@ public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/BigCat.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/BigCat.java
index 13dabe78abb1..c802ab66a5d2 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/BigCat.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/BigCat.java
@@ -105,7 +105,7 @@ public BigCat kind(@javax.annotation.Nullable KindEnum kind) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public KindEnum getKind() {
@@ -113,7 +113,7 @@ public KindEnum getKind() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setKind(@javax.annotation.Nullable KindEnum kind) {
     this.kind = kind;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Capitalization.java
index 2097b0bddd25..629834509b4e 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -80,7 +80,7 @@ public Capitalization smallCamel(@javax.annotation.Nullable String smallCamel) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -88,7 +88,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -107,7 +107,7 @@ public Capitalization capitalCamel(@javax.annotation.Nullable String capitalCame
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -115,7 +115,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -134,7 +134,7 @@ public Capitalization smallSnake(@javax.annotation.Nullable String smallSnake) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -142,7 +142,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -161,7 +161,7 @@ public Capitalization capitalSnake(@javax.annotation.Nullable String capitalSnak
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -169,7 +169,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -188,7 +188,7 @@ public Capitalization scAETHFlowPoints(@javax.annotation.Nullable String scAETHF
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -196,7 +196,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -215,7 +215,7 @@ public Capitalization ATT_NAME(@javax.annotation.Nullable String ATT_NAME) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "Name of the pet ")
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -223,7 +223,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Cat.java
index 4f06daa5af8a..91256dcd3702 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Cat.java
@@ -69,7 +69,7 @@ public Cat declawed(@javax.annotation.Nullable Boolean declawed) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isDeclawed() {
@@ -77,7 +77,7 @@ public Boolean isDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Category.java
index 27cb6dc5eca2..891646633f39 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Category.java
@@ -60,7 +60,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -68,7 +68,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -87,7 +87,7 @@ public Category name(@javax.annotation.Nonnull String name) {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -95,7 +95,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ClassModel.java
index 09c524ff8d72..e6e84ccc2ca1 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -56,7 +56,7 @@ public ClassModel propertyClass(@javax.annotation.Nullable String propertyClass)
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -64,7 +64,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Client.java
index 5c7b130ab19d..4861d7111cb4 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Client.java
@@ -55,7 +55,7 @@ public Client client(@javax.annotation.Nullable String client) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -63,7 +63,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Dog.java
index 3770a6544af0..e02ebe2f1f1a 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Dog.java
@@ -66,7 +66,7 @@ public Dog breed(@javax.annotation.Nullable String breed) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -74,7 +74,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/EnumArrays.java
index b817dda8646d..3c9f9888493a 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -133,7 +133,7 @@ public EnumArrays justSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbo
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -141,7 +141,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -168,7 +168,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -176,7 +176,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/EnumTest.java
index 55aa9167b181..2f9ed0d57d0e 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -221,7 +221,7 @@ public EnumTest enumString(@javax.annotation.Nullable EnumStringEnum enumString)
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -229,7 +229,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -248,7 +248,7 @@ public EnumTest enumStringRequired(@javax.annotation.Nonnull EnumStringRequiredE
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -256,7 +256,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -275,7 +275,7 @@ public EnumTest enumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteg
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -283,7 +283,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -302,7 +302,7 @@ public EnumTest enumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber)
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -310,7 +310,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -329,7 +329,7 @@ public EnumTest outerEnum(@javax.annotation.Nullable OuterEnum outerEnum) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnum getOuterEnum() {
@@ -337,7 +337,7 @@ public OuterEnum getOuterEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnum(@javax.annotation.Nullable OuterEnum outerEnum) {
     this.outerEnum = outerEnum;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/File.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/File.java
index 9592efb80121..36f1016ab82b 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/File.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/File.java
@@ -56,7 +56,7 @@ public File sourceURI(@javax.annotation.Nullable String sourceURI) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "Test capitalization")
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -64,7 +64,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index c4e33d31e58c..cb50ca78dad0 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -64,7 +64,7 @@ public FileSchemaTestClass file(@javax.annotation.Nullable File file) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getFile() {
@@ -72,7 +72,7 @@ public File getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable File file) {
     this.file = file;
@@ -99,7 +99,7 @@ public FileSchemaTestClass addFilesItem(File filesItem) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<File> getFiles() {
@@ -107,7 +107,7 @@ public List<File> getFiles() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<File> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/FormatTest.java
index f5494142683f..6d7369d6f600 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -128,7 +128,7 @@ public FormatTest integer(@javax.annotation.Nullable Integer integer) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -136,7 +136,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -157,7 +157,7 @@ public FormatTest int32(@javax.annotation.Nullable Integer int32) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -165,7 +165,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -184,7 +184,7 @@ public FormatTest int64(@javax.annotation.Nullable Long int64) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -192,7 +192,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -213,7 +213,7 @@ public FormatTest number(@javax.annotation.Nonnull BigDecimal number) {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -221,7 +221,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -242,7 +242,7 @@ public FormatTest _float(@javax.annotation.Nullable Float _float) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -250,7 +250,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -271,7 +271,7 @@ public FormatTest _double(@javax.annotation.Nullable Double _double) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -279,7 +279,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -298,7 +298,7 @@ public FormatTest string(@javax.annotation.Nullable String string) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -306,7 +306,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -325,7 +325,7 @@ public FormatTest _byte(@javax.annotation.Nonnull byte[] _byte) {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -333,7 +333,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -352,7 +352,7 @@ public FormatTest binary(@javax.annotation.Nullable File binary) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -360,7 +360,7 @@ public File getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -379,7 +379,7 @@ public FormatTest date(@javax.annotation.Nonnull LocalDate date) {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -387,7 +387,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -406,7 +406,7 @@ public FormatTest dateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -414,7 +414,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -433,7 +433,7 @@ public FormatTest uuid(@javax.annotation.Nullable UUID uuid) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "72f98069-206d-4f12-9f12-3d1e525a8e84", value = "")
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -441,7 +441,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -460,7 +460,7 @@ public FormatTest password(@javax.annotation.Nonnull String password) {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -468,7 +468,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -487,7 +487,7 @@ public FormatTest bigDecimal(@javax.annotation.Nullable BigDecimal bigDecimal) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getBigDecimal() {
@@ -495,7 +495,7 @@ public BigDecimal getBigDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBigDecimal(@javax.annotation.Nullable BigDecimal bigDecimal) {
     this.bigDecimal = bigDecimal;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 051ab92e6970..692c024e7842 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -65,7 +65,7 @@ public HasOnlyReadOnly(
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -81,7 +81,7 @@ public String getBar() {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/MapTest.java
index b4c1b6927f58..38a0625e1662 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/MapTest.java
@@ -115,7 +115,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -123,7 +123,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -150,7 +150,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -158,7 +158,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -185,7 +185,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -193,7 +193,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -220,7 +220,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -228,7 +228,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 384ff952a32a..7b3a34fcaa40 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -70,7 +70,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@javax.annotation.Nullab
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -78,7 +78,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -97,7 +97,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@javax.annotation.Nu
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -105,7 +105,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -132,7 +132,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -140,7 +140,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Model200Response.java
index 7f4083380ee6..234045024e51 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -62,7 +62,7 @@ public Model200Response name(@javax.annotation.Nullable Integer name) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -70,7 +70,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -89,7 +89,7 @@ public Model200Response propertyClass(@javax.annotation.Nullable String property
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -97,7 +97,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 735370d0b31d..ac7032a36111 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -66,7 +66,7 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -74,7 +74,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -93,7 +93,7 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -101,7 +101,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -120,7 +120,7 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -128,7 +128,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelList.java
index 902e627b80d2..69c79511698b 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelList.java
@@ -56,7 +56,7 @@ public ModelList _123list(@javax.annotation.Nullable String _123list) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -64,7 +64,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelReturn.java
index aa67edb22436..487472ec6419 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -57,7 +57,7 @@ public ModelReturn _return(@javax.annotation.Nullable Integer _return) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -65,7 +65,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Name.java
index 599ed900f31c..6724f4ef453c 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Name.java
@@ -81,7 +81,7 @@ public Name name(@javax.annotation.Nonnull Integer name) {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -89,7 +89,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -102,7 +102,7 @@ public void setName(@javax.annotation.Nonnull Integer name) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -124,7 +124,7 @@ public Name property(@javax.annotation.Nullable String property) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -132,7 +132,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -145,7 +145,7 @@ public void setProperty(@javax.annotation.Nullable String property) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/NumberOnly.java
index 96dd5c074144..ec87dd8463d3 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -56,7 +56,7 @@ public NumberOnly justNumber(@javax.annotation.Nullable BigDecimal justNumber) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -64,7 +64,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Order.java
index 6c5d7ee6e6c9..75321a224b16 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Order.java
@@ -118,7 +118,7 @@ public Order id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -126,7 +126,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -145,7 +145,7 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -153,7 +153,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -172,7 +172,7 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -180,7 +180,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -199,7 +199,7 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -207,7 +207,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -226,7 +226,7 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "Order Status")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -234,7 +234,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -253,7 +253,7 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isComplete() {
@@ -261,7 +261,7 @@ public Boolean isComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/OuterComposite.java
index 59f8c95cf1cc..2bd5f401b064 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -66,7 +66,7 @@ public OuterComposite myNumber(@javax.annotation.Nullable BigDecimal myNumber) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -74,7 +74,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -93,7 +93,7 @@ public OuterComposite myString(@javax.annotation.Nullable String myString) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -101,7 +101,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -120,7 +120,7 @@ public OuterComposite myBoolean(@javax.annotation.Nullable Boolean myBoolean) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isMyBoolean() {
@@ -128,7 +128,7 @@ public Boolean isMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Pet.java
index 8d68aa91bf20..c181eb76c6dd 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Pet.java
@@ -125,7 +125,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -133,7 +133,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -152,7 +152,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -160,7 +160,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -179,7 +179,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(example = "doggie", required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -187,7 +187,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -214,7 +214,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -223,7 +223,7 @@ public Set<String> getPhotoUrls() {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -250,7 +250,7 @@ public Pet addTagsItem(Tag tagsItem) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -258,7 +258,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -277,7 +277,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "pet status in the store")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -285,7 +285,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 09c5403febf1..d5b4373cf4d0 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -62,7 +62,7 @@ public ReadOnlyFirst(
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -84,7 +84,7 @@ public ReadOnlyFirst baz(@javax.annotation.Nullable String baz) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -92,7 +92,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/SpecialModelName.java
index cc4a76e900bd..68e2dcf309e7 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -56,7 +56,7 @@ public SpecialModelName() {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -64,7 +64,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Tag.java
index e5e353fa8637..c7d8a553edc7 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Tag.java
@@ -60,7 +60,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -68,7 +68,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -87,7 +87,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -95,7 +95,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderDefault.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
index bea820ba9405..72953f908970 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
@@ -79,7 +79,7 @@ public TypeHolderDefault stringItem(@javax.annotation.Nonnull String stringItem)
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -87,7 +87,7 @@ public String getStringItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -106,7 +106,7 @@ public TypeHolderDefault numberItem(@javax.annotation.Nonnull BigDecimal numberI
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -114,7 +114,7 @@ public BigDecimal getNumberItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -133,7 +133,7 @@ public TypeHolderDefault integerItem(@javax.annotation.Nonnull Integer integerIt
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -141,7 +141,7 @@ public Integer getIntegerItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -160,7 +160,7 @@ public TypeHolderDefault boolItem(@javax.annotation.Nonnull Boolean boolItem) {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean isBoolItem() {
@@ -168,7 +168,7 @@ public Boolean isBoolItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -195,7 +195,7 @@ public TypeHolderDefault addArrayItemItem(Integer arrayItemItem) {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -203,7 +203,7 @@ public List<Integer> getArrayItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderExample.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderExample.java
index 01e77e3c4869..10bd9e3159ba 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderExample.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderExample.java
@@ -84,7 +84,7 @@ public TypeHolderExample stringItem(@javax.annotation.Nonnull String stringItem)
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(example = "what", required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -92,7 +92,7 @@ public String getStringItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -111,7 +111,7 @@ public TypeHolderExample numberItem(@javax.annotation.Nonnull BigDecimal numberI
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(example = "1.234", required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -119,7 +119,7 @@ public BigDecimal getNumberItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -138,7 +138,7 @@ public TypeHolderExample floatItem(@javax.annotation.Nonnull Float floatItem) {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(example = "1.234", required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Float getFloatItem() {
@@ -146,7 +146,7 @@ public Float getFloatItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setFloatItem(@javax.annotation.Nonnull Float floatItem) {
     this.floatItem = floatItem;
@@ -165,7 +165,7 @@ public TypeHolderExample integerItem(@javax.annotation.Nonnull Integer integerIt
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(example = "-2", required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -173,7 +173,7 @@ public Integer getIntegerItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -192,7 +192,7 @@ public TypeHolderExample boolItem(@javax.annotation.Nonnull Boolean boolItem) {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(example = "true", required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean isBoolItem() {
@@ -200,7 +200,7 @@ public Boolean isBoolItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -227,7 +227,7 @@ public TypeHolderExample addArrayItemItem(Integer arrayItemItem) {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(example = "[0, 1, 2, 3]", required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -235,7 +235,7 @@ public List<Integer> getArrayItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/User.java
index 751cfc8e0e86..cbd6e9ec8b02 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/User.java
@@ -90,7 +90,7 @@ public User id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -98,7 +98,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -117,7 +117,7 @@ public User username(@javax.annotation.Nullable String username) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -125,7 +125,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -144,7 +144,7 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -152,7 +152,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -171,7 +171,7 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -179,7 +179,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -198,7 +198,7 @@ public User email(@javax.annotation.Nullable String email) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -206,7 +206,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -225,7 +225,7 @@ public User password(@javax.annotation.Nullable String password) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -233,7 +233,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -252,7 +252,7 @@ public User phone(@javax.annotation.Nullable String phone) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -260,7 +260,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -279,7 +279,7 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "User Status")
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -287,7 +287,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/XmlItem.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/XmlItem.java
index bab1a081b05e..d367fcece905 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/XmlItem.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/XmlItem.java
@@ -199,7 +199,7 @@ public XmlItem attributeString(@javax.annotation.Nullable String attributeString
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "string", value = "")
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAttributeString() {
@@ -207,7 +207,7 @@ public String getAttributeString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeString(@javax.annotation.Nullable String attributeString) {
     this.attributeString = attributeString;
@@ -226,7 +226,7 @@ public XmlItem attributeNumber(@javax.annotation.Nullable BigDecimal attributeNu
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "1.234", value = "")
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getAttributeNumber() {
@@ -234,7 +234,7 @@ public BigDecimal getAttributeNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeNumber(@javax.annotation.Nullable BigDecimal attributeNumber) {
     this.attributeNumber = attributeNumber;
@@ -253,7 +253,7 @@ public XmlItem attributeInteger(@javax.annotation.Nullable Integer attributeInte
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "-2", value = "")
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getAttributeInteger() {
@@ -261,7 +261,7 @@ public Integer getAttributeInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeInteger(@javax.annotation.Nullable Integer attributeInteger) {
     this.attributeInteger = attributeInteger;
@@ -280,7 +280,7 @@ public XmlItem attributeBoolean(@javax.annotation.Nullable Boolean attributeBool
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "true", value = "")
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isAttributeBoolean() {
@@ -288,7 +288,7 @@ public Boolean isAttributeBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeBoolean(@javax.annotation.Nullable Boolean attributeBoolean) {
     this.attributeBoolean = attributeBoolean;
@@ -315,7 +315,7 @@ public XmlItem addWrappedArrayItem(Integer wrappedArrayItem) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getWrappedArray() {
@@ -323,7 +323,7 @@ public List<Integer> getWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setWrappedArray(@javax.annotation.Nullable List<Integer> wrappedArray) {
     this.wrappedArray = wrappedArray;
@@ -342,7 +342,7 @@ public XmlItem nameString(@javax.annotation.Nullable String nameString) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "string", value = "")
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNameString() {
@@ -350,7 +350,7 @@ public String getNameString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameString(@javax.annotation.Nullable String nameString) {
     this.nameString = nameString;
@@ -369,7 +369,7 @@ public XmlItem nameNumber(@javax.annotation.Nullable BigDecimal nameNumber) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "1.234", value = "")
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNameNumber() {
@@ -377,7 +377,7 @@ public BigDecimal getNameNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameNumber(@javax.annotation.Nullable BigDecimal nameNumber) {
     this.nameNumber = nameNumber;
@@ -396,7 +396,7 @@ public XmlItem nameInteger(@javax.annotation.Nullable Integer nameInteger) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "-2", value = "")
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNameInteger() {
@@ -404,7 +404,7 @@ public Integer getNameInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameInteger(@javax.annotation.Nullable Integer nameInteger) {
     this.nameInteger = nameInteger;
@@ -423,7 +423,7 @@ public XmlItem nameBoolean(@javax.annotation.Nullable Boolean nameBoolean) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "true", value = "")
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isNameBoolean() {
@@ -431,7 +431,7 @@ public Boolean isNameBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameBoolean(@javax.annotation.Nullable Boolean nameBoolean) {
     this.nameBoolean = nameBoolean;
@@ -458,7 +458,7 @@ public XmlItem addNameArrayItem(Integer nameArrayItem) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameArray() {
@@ -466,7 +466,7 @@ public List<Integer> getNameArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameArray(@javax.annotation.Nullable List<Integer> nameArray) {
     this.nameArray = nameArray;
@@ -493,7 +493,7 @@ public XmlItem addNameWrappedArrayItem(Integer nameWrappedArrayItem) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameWrappedArray() {
@@ -501,7 +501,7 @@ public List<Integer> getNameWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameWrappedArray(@javax.annotation.Nullable List<Integer> nameWrappedArray) {
     this.nameWrappedArray = nameWrappedArray;
@@ -520,7 +520,7 @@ public XmlItem prefixString(@javax.annotation.Nullable String prefixString) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "string", value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixString() {
@@ -528,7 +528,7 @@ public String getPrefixString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixString(@javax.annotation.Nullable String prefixString) {
     this.prefixString = prefixString;
@@ -547,7 +547,7 @@ public XmlItem prefixNumber(@javax.annotation.Nullable BigDecimal prefixNumber)
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "1.234", value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNumber() {
@@ -555,7 +555,7 @@ public BigDecimal getPrefixNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNumber(@javax.annotation.Nullable BigDecimal prefixNumber) {
     this.prefixNumber = prefixNumber;
@@ -574,7 +574,7 @@ public XmlItem prefixInteger(@javax.annotation.Nullable Integer prefixInteger) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "-2", value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixInteger() {
@@ -582,7 +582,7 @@ public Integer getPrefixInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixInteger(@javax.annotation.Nullable Integer prefixInteger) {
     this.prefixInteger = prefixInteger;
@@ -601,7 +601,7 @@ public XmlItem prefixBoolean(@javax.annotation.Nullable Boolean prefixBoolean) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "true", value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isPrefixBoolean() {
@@ -609,7 +609,7 @@ public Boolean isPrefixBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixBoolean(@javax.annotation.Nullable Boolean prefixBoolean) {
     this.prefixBoolean = prefixBoolean;
@@ -636,7 +636,7 @@ public XmlItem addPrefixArrayItem(Integer prefixArrayItem) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixArray() {
@@ -644,7 +644,7 @@ public List<Integer> getPrefixArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixArray(@javax.annotation.Nullable List<Integer> prefixArray) {
     this.prefixArray = prefixArray;
@@ -671,7 +671,7 @@ public XmlItem addPrefixWrappedArrayItem(Integer prefixWrappedArrayItem) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixWrappedArray() {
@@ -679,7 +679,7 @@ public List<Integer> getPrefixWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixWrappedArray(@javax.annotation.Nullable List<Integer> prefixWrappedArray) {
     this.prefixWrappedArray = prefixWrappedArray;
@@ -698,7 +698,7 @@ public XmlItem namespaceString(@javax.annotation.Nullable String namespaceString
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "string", value = "")
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNamespaceString() {
@@ -706,7 +706,7 @@ public String getNamespaceString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceString(@javax.annotation.Nullable String namespaceString) {
     this.namespaceString = namespaceString;
@@ -725,7 +725,7 @@ public XmlItem namespaceNumber(@javax.annotation.Nullable BigDecimal namespaceNu
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "1.234", value = "")
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNamespaceNumber() {
@@ -733,7 +733,7 @@ public BigDecimal getNamespaceNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceNumber(@javax.annotation.Nullable BigDecimal namespaceNumber) {
     this.namespaceNumber = namespaceNumber;
@@ -752,7 +752,7 @@ public XmlItem namespaceInteger(@javax.annotation.Nullable Integer namespaceInte
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "-2", value = "")
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNamespaceInteger() {
@@ -760,7 +760,7 @@ public Integer getNamespaceInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceInteger(@javax.annotation.Nullable Integer namespaceInteger) {
     this.namespaceInteger = namespaceInteger;
@@ -779,7 +779,7 @@ public XmlItem namespaceBoolean(@javax.annotation.Nullable Boolean namespaceBool
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "true", value = "")
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isNamespaceBoolean() {
@@ -787,7 +787,7 @@ public Boolean isNamespaceBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceBoolean(@javax.annotation.Nullable Boolean namespaceBoolean) {
     this.namespaceBoolean = namespaceBoolean;
@@ -814,7 +814,7 @@ public XmlItem addNamespaceArrayItem(Integer namespaceArrayItem) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceArray() {
@@ -822,7 +822,7 @@ public List<Integer> getNamespaceArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceArray(@javax.annotation.Nullable List<Integer> namespaceArray) {
     this.namespaceArray = namespaceArray;
@@ -849,7 +849,7 @@ public XmlItem addNamespaceWrappedArrayItem(Integer namespaceWrappedArrayItem) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceWrappedArray() {
@@ -857,7 +857,7 @@ public List<Integer> getNamespaceWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceWrappedArray(@javax.annotation.Nullable List<Integer> namespaceWrappedArray) {
     this.namespaceWrappedArray = namespaceWrappedArray;
@@ -876,7 +876,7 @@ public XmlItem prefixNsString(@javax.annotation.Nullable String prefixNsString)
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "string", value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixNsString() {
@@ -884,7 +884,7 @@ public String getPrefixNsString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsString(@javax.annotation.Nullable String prefixNsString) {
     this.prefixNsString = prefixNsString;
@@ -903,7 +903,7 @@ public XmlItem prefixNsNumber(@javax.annotation.Nullable BigDecimal prefixNsNumb
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "1.234", value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNsNumber() {
@@ -911,7 +911,7 @@ public BigDecimal getPrefixNsNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsNumber(@javax.annotation.Nullable BigDecimal prefixNsNumber) {
     this.prefixNsNumber = prefixNsNumber;
@@ -930,7 +930,7 @@ public XmlItem prefixNsInteger(@javax.annotation.Nullable Integer prefixNsIntege
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "-2", value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixNsInteger() {
@@ -938,7 +938,7 @@ public Integer getPrefixNsInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsInteger(@javax.annotation.Nullable Integer prefixNsInteger) {
     this.prefixNsInteger = prefixNsInteger;
@@ -957,7 +957,7 @@ public XmlItem prefixNsBoolean(@javax.annotation.Nullable Boolean prefixNsBoolea
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "true", value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isPrefixNsBoolean() {
@@ -965,7 +965,7 @@ public Boolean isPrefixNsBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsBoolean(@javax.annotation.Nullable Boolean prefixNsBoolean) {
     this.prefixNsBoolean = prefixNsBoolean;
@@ -992,7 +992,7 @@ public XmlItem addPrefixNsArrayItem(Integer prefixNsArrayItem) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsArray() {
@@ -1000,7 +1000,7 @@ public List<Integer> getPrefixNsArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsArray(@javax.annotation.Nullable List<Integer> prefixNsArray) {
     this.prefixNsArray = prefixNsArray;
@@ -1027,7 +1027,7 @@ public XmlItem addPrefixNsWrappedArrayItem(Integer prefixNsWrappedArrayItem) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsWrappedArray() {
@@ -1035,7 +1035,7 @@ public List<Integer> getPrefixNsWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsWrappedArray(@javax.annotation.Nullable List<Integer> prefixNsWrappedArray) {
     this.prefixNsWrappedArray = prefixNsWrappedArray;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 519c95fe4e10..b304a32f68e2 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -64,7 +64,7 @@ public AdditionalPropertiesClass putMapPropertyItem(String key, String mapProper
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -72,7 +72,7 @@ public Map<String, String> getMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -98,7 +98,7 @@ public AdditionalPropertiesClass putMapOfMapPropertyItem(String key, Map<String,
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -106,7 +106,7 @@ public Map<String, Map<String, String>> getMapOfMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 951f485ef703..4070e7aedaeb 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -55,7 +55,7 @@ public AllOfWithSingleRef username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -63,7 +63,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -81,7 +81,7 @@ public AllOfWithSingleRef singleRefType(@javax.annotation.Nullable SingleRefType
    * @return singleRefType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -89,7 +89,7 @@ public SingleRefType getSingleRefType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@javax.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Animal.java
index 19e308b46a9f..450f55e0c8df 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Animal.java
@@ -67,7 +67,7 @@ public Animal className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -75,7 +75,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -93,7 +93,7 @@ public Animal color(@javax.annotation.Nullable String color) {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -101,7 +101,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index ddbdf87f33fd..6bd84bd2af24 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -61,7 +61,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -69,7 +69,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index d68310c80773..f6ec8bd3f5aa 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -61,7 +61,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -69,7 +69,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayTest.java
index c64553f65a00..10ff182a2ce4 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -71,7 +71,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -79,7 +79,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -105,7 +105,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -113,7 +113,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -139,7 +139,7 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -147,7 +147,7 @@ public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Capitalization.java
index 08856f42ccaf..c0bfed4ceb3f 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -74,7 +74,7 @@ public Capitalization smallCamel(@javax.annotation.Nullable String smallCamel) {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -82,7 +82,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -100,7 +100,7 @@ public Capitalization capitalCamel(@javax.annotation.Nullable String capitalCame
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -108,7 +108,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -126,7 +126,7 @@ public Capitalization smallSnake(@javax.annotation.Nullable String smallSnake) {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -134,7 +134,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -152,7 +152,7 @@ public Capitalization capitalSnake(@javax.annotation.Nullable String capitalSnak
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -160,7 +160,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -178,7 +178,7 @@ public Capitalization scAETHFlowPoints(@javax.annotation.Nullable String scAETHF
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -186,7 +186,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -204,7 +204,7 @@ public Capitalization ATT_NAME(@javax.annotation.Nullable String ATT_NAME) {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -212,7 +212,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Cat.java
index 9ac4735cae75..c9640eb9d606 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Cat.java
@@ -60,7 +60,7 @@ public Cat declawed(@javax.annotation.Nullable Boolean declawed) {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isDeclawed() {
@@ -68,7 +68,7 @@ public Boolean isDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Category.java
index 6176dcce5a53..5cd912c637f7 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Category.java
@@ -54,7 +54,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public Category name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index 6d28b846e134..966e550ed58f 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -61,7 +61,7 @@ public ChildWithNullable otherProperty(@javax.annotation.Nullable String otherPr
    * @return otherProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -69,7 +69,7 @@ public String getOtherProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@javax.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ClassModel.java
index b0ee79bf0a2c..8bbff8268c14 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -49,7 +49,7 @@ public ClassModel propertyClass(@javax.annotation.Nullable String propertyClass)
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -57,7 +57,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Client.java
index 36b415404a71..b98ab5c2e070 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Client.java
@@ -49,7 +49,7 @@ public Client client(@javax.annotation.Nullable String client) {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -57,7 +57,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 3401d0a58ced..03b3fab5be8b 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -51,7 +51,7 @@ public DeprecatedObject name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -59,7 +59,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Dog.java
index bf0eea90573a..331fc8b1f502 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Dog.java
@@ -60,7 +60,7 @@ public Dog breed(@javax.annotation.Nullable String breed) {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -68,7 +68,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/EnumArrays.java
index 5d9be29b25c2..28855ff0c41a 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -127,7 +127,7 @@ public EnumArrays justSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbo
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -135,7 +135,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -161,7 +161,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -169,7 +169,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/EnumTest.java
index 2b09e9ebed33..f46b716be35c 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -236,7 +236,7 @@ public EnumTest enumString(@javax.annotation.Nullable EnumStringEnum enumString)
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -244,7 +244,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -262,7 +262,7 @@ public EnumTest enumStringRequired(@javax.annotation.Nonnull EnumStringRequiredE
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -270,7 +270,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -288,7 +288,7 @@ public EnumTest enumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteg
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -296,7 +296,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -314,7 +314,7 @@ public EnumTest enumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber)
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -322,7 +322,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -346,7 +346,7 @@ public OuterEnum getOuterEnum() {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -374,7 +374,7 @@ public EnumTest outerEnumInteger(@javax.annotation.Nullable OuterEnumInteger out
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -382,7 +382,7 @@ public OuterEnumInteger getOuterEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -400,7 +400,7 @@ public EnumTest outerEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaul
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -408,7 +408,7 @@ public OuterEnumDefaultValue getOuterEnumDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -426,7 +426,7 @@ public EnumTest outerEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnu
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -434,7 +434,7 @@ public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 335206051a4c..103dd9e03797 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -58,7 +58,7 @@ public FakeBigDecimalMap200Response someId(@javax.annotation.Nullable BigDecimal
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -66,7 +66,7 @@ public BigDecimal getSomeId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -92,7 +92,7 @@ public FakeBigDecimalMap200Response putSomeMapItem(String key, BigDecimal someMa
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -100,7 +100,7 @@ public Map<String, BigDecimal> getSomeMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/File.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/File.java
index 0ccb2866e6f5..72cd42fd1127 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/File.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/File.java
@@ -49,7 +49,7 @@ public File sourceURI(@javax.annotation.Nullable String sourceURI) {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -57,7 +57,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 76f1b719b1e1..34f73d92536e 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -58,7 +58,7 @@ public FileSchemaTestClass file(@javax.annotation.Nullable File file) {
    * @return file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getFile() {
@@ -66,7 +66,7 @@ public File getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable File file) {
     this.file = file;
@@ -92,7 +92,7 @@ public FileSchemaTestClass addFilesItem(File filesItem) {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<File> getFiles() {
@@ -100,7 +100,7 @@ public List<File> getFiles() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<File> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Foo.java
index 463ae01d5cea..4846b6d1ea72 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Foo.java
@@ -49,7 +49,7 @@ public Foo bar(@javax.annotation.Nullable String bar) {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -57,7 +57,7 @@ public String getBar() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 43c21b188db5..1b077747099e 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -51,7 +51,7 @@ public FooGetDefaultResponse string(@javax.annotation.Nullable Foo string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -59,7 +59,7 @@ public Foo getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FormatTest.java
index 2203497797d6..31643a880a45 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -132,7 +132,7 @@ public FormatTest integer(@javax.annotation.Nullable Integer integer) {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -140,7 +140,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -160,7 +160,7 @@ public FormatTest int32(@javax.annotation.Nullable Integer int32) {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -168,7 +168,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -186,7 +186,7 @@ public FormatTest int64(@javax.annotation.Nullable Long int64) {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -194,7 +194,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -214,7 +214,7 @@ public FormatTest number(@javax.annotation.Nonnull BigDecimal number) {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -222,7 +222,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -242,7 +242,7 @@ public FormatTest _float(@javax.annotation.Nullable Float _float) {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -250,7 +250,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -270,7 +270,7 @@ public FormatTest _double(@javax.annotation.Nullable Double _double) {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -278,7 +278,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -296,7 +296,7 @@ public FormatTest decimal(@javax.annotation.Nullable BigDecimal decimal) {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -304,7 +304,7 @@ public BigDecimal getDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -322,7 +322,7 @@ public FormatTest string(@javax.annotation.Nullable String string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -330,7 +330,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -348,7 +348,7 @@ public FormatTest _byte(@javax.annotation.Nonnull byte[] _byte) {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -356,7 +356,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -374,7 +374,7 @@ public FormatTest binary(@javax.annotation.Nullable File binary) {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -382,7 +382,7 @@ public File getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -400,7 +400,7 @@ public FormatTest date(@javax.annotation.Nonnull LocalDate date) {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -408,7 +408,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -426,7 +426,7 @@ public FormatTest dateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -434,7 +434,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -452,7 +452,7 @@ public FormatTest uuid(@javax.annotation.Nullable UUID uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -460,7 +460,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -478,7 +478,7 @@ public FormatTest password(@javax.annotation.Nonnull String password) {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -486,7 +486,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -504,7 +504,7 @@ public FormatTest patternWithDigits(@javax.annotation.Nullable String patternWit
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -512,7 +512,7 @@ public String getPatternWithDigits() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -530,7 +530,7 @@ public FormatTest patternWithDigitsAndDelimiter(@javax.annotation.Nullable Strin
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -538,7 +538,7 @@ public String getPatternWithDigitsAndDelimiter() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index c4911fbaf299..9ba03b499d24 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -59,7 +59,7 @@ public HasOnlyReadOnly(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -74,7 +74,7 @@ public String getBar() {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 04185c07159e..cd7287412170 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -58,7 +58,7 @@ public String getNullableMessage() {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/MapTest.java
index 7c7e8bf90863..ec5ee7bb1645 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/MapTest.java
@@ -109,7 +109,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -117,7 +117,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -143,7 +143,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -151,7 +151,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -177,7 +177,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -185,7 +185,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -211,7 +211,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -219,7 +219,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index b99867682dd6..c820ba2fe58b 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -64,7 +64,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@javax.annotation.Nullab
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -72,7 +72,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -90,7 +90,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@javax.annotation.Nu
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -98,7 +98,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -124,7 +124,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -132,7 +132,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Model200Response.java
index 32fee39581c0..3626d2cf696d 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -55,7 +55,7 @@ public Model200Response name(@javax.annotation.Nullable Integer name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -63,7 +63,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -81,7 +81,7 @@ public Model200Response propertyClass(@javax.annotation.Nullable String property
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -89,7 +89,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 0a5ba46129a9..5ec1d7b79a88 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -60,7 +60,7 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -68,7 +68,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -86,7 +86,7 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -94,7 +94,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -112,7 +112,7 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -120,7 +120,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelList.java
index 2c483607d79c..e5321f45292b 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelList.java
@@ -50,7 +50,7 @@ public ModelList _123list(@javax.annotation.Nullable String _123list) {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -58,7 +58,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelReturn.java
index 9be47ab8e0bf..48898b8c24d6 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -50,7 +50,7 @@ public ModelReturn _return(@javax.annotation.Nullable Integer _return) {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -58,7 +58,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Name.java
index 063860b55176..7416abba589e 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Name.java
@@ -74,7 +74,7 @@ public Name name(@javax.annotation.Nonnull Integer name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -82,7 +82,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -94,7 +94,7 @@ public void setName(@javax.annotation.Nonnull Integer name) {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -115,7 +115,7 @@ public Name property(@javax.annotation.Nullable String property) {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -123,7 +123,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -135,7 +135,7 @@ public void setProperty(@javax.annotation.Nullable String property) {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/NullableClass.java
index 4996df36423c..015ebd3ccf00 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -116,7 +116,7 @@ public Integer getIntegerProp() {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -150,7 +150,7 @@ public BigDecimal getNumberProp() {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -184,7 +184,7 @@ public Boolean isBooleanProp() {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> isBooleanProp_JsonNullable() {
@@ -218,7 +218,7 @@ public String getStringProp() {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -252,7 +252,7 @@ public LocalDate getDateProp() {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -286,7 +286,7 @@ public OffsetDateTime getDatetimeProp() {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -332,7 +332,7 @@ public List<Object> getArrayNullableProp() {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -378,7 +378,7 @@ public List<Object> getArrayAndItemsNullableProp() {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -414,7 +414,7 @@ public NullableClass addArrayItemsNullableItem(Object arrayItemsNullableItem) {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -422,7 +422,7 @@ public List<Object> getArrayItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -458,7 +458,7 @@ public Map<String, Object> getObjectNullableProp() {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -504,7 +504,7 @@ public Map<String, Object> getObjectAndItemsNullableProp() {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -540,7 +540,7 @@ public NullableClass putObjectItemsNullableItem(String key, Object objectItemsNu
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -548,7 +548,7 @@ public Map<String, Object> getObjectItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/NumberOnly.java
index 5320c0ba1199..5de3c5578f81 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -50,7 +50,7 @@ public NumberOnly justNumber(@javax.annotation.Nullable BigDecimal justNumber) {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -58,7 +58,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 41f3d3a6e0c1..dea38411a3d7 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -69,7 +69,7 @@ public ObjectWithDeprecatedFields uuid(@javax.annotation.Nullable String uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -77,7 +77,7 @@ public String getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -97,7 +97,7 @@ public ObjectWithDeprecatedFields id(@javax.annotation.Nullable BigDecimal id) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -105,7 +105,7 @@ public BigDecimal getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -125,7 +125,7 @@ public ObjectWithDeprecatedFields deprecatedRef(@javax.annotation.Nullable Depre
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -133,7 +133,7 @@ public DeprecatedObject getDeprecatedRef() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -161,7 +161,7 @@ public ObjectWithDeprecatedFields addBarsItem(String barsItem) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -169,7 +169,7 @@ public List<String> getBars() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Order.java
index 6e36f9dcd45b..d29ba68634f0 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Order.java
@@ -112,7 +112,7 @@ public Order id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -120,7 +120,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -138,7 +138,7 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -146,7 +146,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -164,7 +164,7 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -172,7 +172,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -190,7 +190,7 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -198,7 +198,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -216,7 +216,7 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -224,7 +224,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -242,7 +242,7 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isComplete() {
@@ -250,7 +250,7 @@ public Boolean isComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/OuterComposite.java
index 199d81b3455b..9c6cc6714da0 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -60,7 +60,7 @@ public OuterComposite myNumber(@javax.annotation.Nullable BigDecimal myNumber) {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -68,7 +68,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -86,7 +86,7 @@ public OuterComposite myString(@javax.annotation.Nullable String myString) {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -94,7 +94,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -112,7 +112,7 @@ public OuterComposite myBoolean(@javax.annotation.Nullable Boolean myBoolean) {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isMyBoolean() {
@@ -120,7 +120,7 @@ public Boolean isMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 5488479ce207..dcabc1b57ead 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -50,7 +50,7 @@ public OuterObjectWithEnumProperty value(@javax.annotation.Nonnull OuterEnumInte
    * @return value
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -58,7 +58,7 @@ public OuterEnumInteger getValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@javax.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index 95fe799a1068..07b3d5721edf 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -102,7 +102,7 @@ public ParentWithNullable type(@javax.annotation.Nullable TypeEnum type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -110,7 +110,7 @@ public TypeEnum getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -134,7 +134,7 @@ public String getNullableProperty() {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Pet.java
index cdab0b745fff..356b23af5bc3 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Pet.java
@@ -119,7 +119,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -127,7 +127,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -145,7 +145,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -153,7 +153,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -171,7 +171,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -179,7 +179,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -205,7 +205,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -214,7 +214,7 @@ public Set<String> getPhotoUrls() {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -240,7 +240,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -248,7 +248,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -266,7 +266,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -274,7 +274,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index c301aaa5b85e..5f5b42900027 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -56,7 +56,7 @@ public ReadOnlyFirst(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -77,7 +77,7 @@ public ReadOnlyFirst baz(@javax.annotation.Nullable String baz) {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -85,7 +85,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 16b10bc50579..fa900aef3f54 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -50,7 +50,7 @@ public SpecialModelName() {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -58,7 +58,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Tag.java
index 8741cba2698c..72ce11b587b8 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Tag.java
@@ -54,7 +54,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index d6419a7ed19f..de4a70be1e11 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -54,7 +54,7 @@ public TestInlineFreeformAdditionalPropertiesRequest someProperty(@javax.annotat
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -62,7 +62,7 @@ public String getSomeProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/User.java
index 14116fddd9e2..7ad5190b5e02 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/User.java
@@ -84,7 +84,7 @@ public User id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -92,7 +92,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -110,7 +110,7 @@ public User username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -118,7 +118,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -136,7 +136,7 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -144,7 +144,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -162,7 +162,7 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -170,7 +170,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -188,7 +188,7 @@ public User email(@javax.annotation.Nullable String email) {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -196,7 +196,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -214,7 +214,7 @@ public User password(@javax.annotation.Nullable String password) {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -222,7 +222,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -240,7 +240,7 @@ public User phone(@javax.annotation.Nullable String phone) {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -248,7 +248,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -266,7 +266,7 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -274,7 +274,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
index bee74a4c8118..89864f827112 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
@@ -52,7 +52,7 @@ public AdditionalPropertiesAnyType name(@javax.annotation.Nullable String name)
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
index 5aba7267a12a..dfd23375dc01 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
@@ -53,7 +53,7 @@ public AdditionalPropertiesArray name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -61,7 +61,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
index 8114cd21193f..506a41488de9 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
@@ -52,7 +52,7 @@ public AdditionalPropertiesBoolean name(@javax.annotation.Nullable String name)
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 581c2fbe1407..8044ecbab6ea 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -111,7 +111,7 @@ public AdditionalPropertiesClass putMapStringItem(String key, String mapStringIt
    * @return mapString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapString() {
@@ -119,7 +119,7 @@ public Map<String, String> getMapString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapString(@javax.annotation.Nullable Map<String, String> mapString) {
     this.mapString = mapString;
@@ -144,7 +144,7 @@ public AdditionalPropertiesClass putMapNumberItem(String key, BigDecimal mapNumb
    * @return mapNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getMapNumber() {
@@ -152,7 +152,7 @@ public Map<String, BigDecimal> getMapNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapNumber(@javax.annotation.Nullable Map<String, BigDecimal> mapNumber) {
     this.mapNumber = mapNumber;
@@ -177,7 +177,7 @@ public AdditionalPropertiesClass putMapIntegerItem(String key, Integer mapIntege
    * @return mapInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Integer> getMapInteger() {
@@ -185,7 +185,7 @@ public Map<String, Integer> getMapInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapInteger(@javax.annotation.Nullable Map<String, Integer> mapInteger) {
     this.mapInteger = mapInteger;
@@ -210,7 +210,7 @@ public AdditionalPropertiesClass putMapBooleanItem(String key, Boolean mapBoolea
    * @return mapBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getMapBoolean() {
@@ -218,7 +218,7 @@ public Map<String, Boolean> getMapBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapBoolean(@javax.annotation.Nullable Map<String, Boolean> mapBoolean) {
     this.mapBoolean = mapBoolean;
@@ -243,7 +243,7 @@ public AdditionalPropertiesClass putMapArrayIntegerItem(String key, List<Integer
    * @return mapArrayInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Integer>> getMapArrayInteger() {
@@ -251,7 +251,7 @@ public Map<String, List<Integer>> getMapArrayInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayInteger(@javax.annotation.Nullable Map<String, List<Integer>> mapArrayInteger) {
     this.mapArrayInteger = mapArrayInteger;
@@ -276,7 +276,7 @@ public AdditionalPropertiesClass putMapArrayAnytypeItem(String key, List<Object>
    * @return mapArrayAnytype
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Object>> getMapArrayAnytype() {
@@ -284,7 +284,7 @@ public Map<String, List<Object>> getMapArrayAnytype() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayAnytype(@javax.annotation.Nullable Map<String, List<Object>> mapArrayAnytype) {
     this.mapArrayAnytype = mapArrayAnytype;
@@ -309,7 +309,7 @@ public AdditionalPropertiesClass putMapMapStringItem(String key, Map<String, Str
    * @return mapMapString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapString() {
@@ -317,7 +317,7 @@ public Map<String, Map<String, String>> getMapMapString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapString) {
     this.mapMapString = mapMapString;
@@ -342,7 +342,7 @@ public AdditionalPropertiesClass putMapMapAnytypeItem(String key, Map<String, Ob
    * @return mapMapAnytype
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, Object>> getMapMapAnytype() {
@@ -350,7 +350,7 @@ public Map<String, Map<String, Object>> getMapMapAnytype() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapAnytype(@javax.annotation.Nullable Map<String, Map<String, Object>> mapMapAnytype) {
     this.mapMapAnytype = mapMapAnytype;
@@ -367,7 +367,7 @@ public AdditionalPropertiesClass anytype1(@javax.annotation.Nullable Object anyt
    * @return anytype1
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype1() {
@@ -375,7 +375,7 @@ public Object getAnytype1() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype1(@javax.annotation.Nullable Object anytype1) {
     this.anytype1 = anytype1;
@@ -392,7 +392,7 @@ public AdditionalPropertiesClass anytype2(@javax.annotation.Nullable Object anyt
    * @return anytype2
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype2() {
@@ -400,7 +400,7 @@ public Object getAnytype2() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype2(@javax.annotation.Nullable Object anytype2) {
     this.anytype2 = anytype2;
@@ -417,7 +417,7 @@ public AdditionalPropertiesClass anytype3(@javax.annotation.Nullable Object anyt
    * @return anytype3
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype3() {
@@ -425,7 +425,7 @@ public Object getAnytype3() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype3(@javax.annotation.Nullable Object anytype3) {
     this.anytype3 = anytype3;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
index cd225fac1575..613f96692a46 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
@@ -52,7 +52,7 @@ public AdditionalPropertiesInteger name(@javax.annotation.Nullable String name)
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
index 5ef408e04c4c..0c00ee724427 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
@@ -53,7 +53,7 @@ public AdditionalPropertiesNumber name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -61,7 +61,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
index 3a313e40fe2b..524112e88a91 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
@@ -52,7 +52,7 @@ public AdditionalPropertiesObject name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
index 4a834585bfe1..7b418b7c87e8 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
@@ -52,7 +52,7 @@ public AdditionalPropertiesString name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Animal.java
index e88053cfbca1..eaa5c323d7fe 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Animal.java
@@ -68,7 +68,7 @@ public Animal className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -76,7 +76,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -93,7 +93,7 @@ public Animal color(@javax.annotation.Nullable String color) {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -101,7 +101,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 9f9230f5c51b..e48bf84ca4cc 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -61,7 +61,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -69,7 +69,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 95eb35a262ca..01c9badd8ece 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -61,7 +61,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -69,7 +69,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayTest.java
index 6e87eafcc512..006c8ce93a21 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -71,7 +71,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -79,7 +79,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -104,7 +104,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -112,7 +112,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -137,7 +137,7 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -145,7 +145,7 @@ public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/BigCat.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/BigCat.java
index d72c2a445010..cdf37400e42c 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/BigCat.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/BigCat.java
@@ -99,7 +99,7 @@ public BigCat kind(@javax.annotation.Nullable KindEnum kind) {
    * @return kind
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public KindEnum getKind() {
@@ -107,7 +107,7 @@ public KindEnum getKind() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setKind(@javax.annotation.Nullable KindEnum kind) {
     this.kind = kind;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Capitalization.java
index dec70966d099..dd08bed9aebb 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -74,7 +74,7 @@ public Capitalization smallCamel(@javax.annotation.Nullable String smallCamel) {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -82,7 +82,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -99,7 +99,7 @@ public Capitalization capitalCamel(@javax.annotation.Nullable String capitalCame
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -107,7 +107,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -124,7 +124,7 @@ public Capitalization smallSnake(@javax.annotation.Nullable String smallSnake) {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -132,7 +132,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -149,7 +149,7 @@ public Capitalization capitalSnake(@javax.annotation.Nullable String capitalSnak
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -157,7 +157,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -174,7 +174,7 @@ public Capitalization scAETHFlowPoints(@javax.annotation.Nullable String scAETHF
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -182,7 +182,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -199,7 +199,7 @@ public Capitalization ATT_NAME(@javax.annotation.Nullable String ATT_NAME) {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -207,7 +207,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Cat.java
index 66109a131e1a..ff3c8f5bc560 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Cat.java
@@ -63,7 +63,7 @@ public Cat declawed(@javax.annotation.Nullable Boolean declawed) {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -71,7 +71,7 @@ public Boolean getDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Category.java
index d1fc7b09c499..9e1b7316bbfa 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Category.java
@@ -54,7 +54,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Category name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ClassModel.java
index 675e9f398283..e8d8b419f6ab 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -49,7 +49,7 @@ public ClassModel propertyClass(@javax.annotation.Nullable String propertyClass)
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -57,7 +57,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Client.java
index 434d46ad1b64..2d1ad6833b70 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Client.java
@@ -49,7 +49,7 @@ public Client client(@javax.annotation.Nullable String client) {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -57,7 +57,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Dog.java
index b62b147f96e1..8787d050632b 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Dog.java
@@ -60,7 +60,7 @@ public Dog breed(@javax.annotation.Nullable String breed) {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -68,7 +68,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/EnumArrays.java
index 96da52dd6a11..2d9895cc3874 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -127,7 +127,7 @@ public EnumArrays justSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbo
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -135,7 +135,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -160,7 +160,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -168,7 +168,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/EnumTest.java
index f9183223c201..591077e5a260 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -215,7 +215,7 @@ public EnumTest enumString(@javax.annotation.Nullable EnumStringEnum enumString)
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -223,7 +223,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -240,7 +240,7 @@ public EnumTest enumStringRequired(@javax.annotation.Nonnull EnumStringRequiredE
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -248,7 +248,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -265,7 +265,7 @@ public EnumTest enumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteg
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -273,7 +273,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -290,7 +290,7 @@ public EnumTest enumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber)
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -298,7 +298,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -315,7 +315,7 @@ public EnumTest outerEnum(@javax.annotation.Nullable OuterEnum outerEnum) {
    * @return outerEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnum getOuterEnum() {
@@ -323,7 +323,7 @@ public OuterEnum getOuterEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnum(@javax.annotation.Nullable OuterEnum outerEnum) {
     this.outerEnum = outerEnum;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 3231a00ed0f3..39bb17b9ea7b 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -58,7 +58,7 @@ public FileSchemaTestClass _file(@javax.annotation.Nullable ModelFile _file) {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -66,7 +66,7 @@ public ModelFile getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -91,7 +91,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -99,7 +99,7 @@ public List<ModelFile> getFiles() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/FormatTest.java
index e6899f6085d7..c7a22e4791e8 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -122,7 +122,7 @@ public FormatTest integer(@javax.annotation.Nullable Integer integer) {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -130,7 +130,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -149,7 +149,7 @@ public FormatTest int32(@javax.annotation.Nullable Integer int32) {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -157,7 +157,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -174,7 +174,7 @@ public FormatTest int64(@javax.annotation.Nullable Long int64) {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -182,7 +182,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -201,7 +201,7 @@ public FormatTest number(@javax.annotation.Nonnull BigDecimal number) {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -209,7 +209,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -228,7 +228,7 @@ public FormatTest _float(@javax.annotation.Nullable Float _float) {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -236,7 +236,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -255,7 +255,7 @@ public FormatTest _double(@javax.annotation.Nullable Double _double) {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -263,7 +263,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -280,7 +280,7 @@ public FormatTest string(@javax.annotation.Nullable String string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -288,7 +288,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -305,7 +305,7 @@ public FormatTest _byte(@javax.annotation.Nonnull byte[] _byte) {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -313,7 +313,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -330,7 +330,7 @@ public FormatTest binary(@javax.annotation.Nullable File binary) {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -338,7 +338,7 @@ public File getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -355,7 +355,7 @@ public FormatTest date(@javax.annotation.Nonnull LocalDate date) {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -363,7 +363,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -380,7 +380,7 @@ public FormatTest dateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -388,7 +388,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -405,7 +405,7 @@ public FormatTest uuid(@javax.annotation.Nullable UUID uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -413,7 +413,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -430,7 +430,7 @@ public FormatTest password(@javax.annotation.Nonnull String password) {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -438,7 +438,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -455,7 +455,7 @@ public FormatTest bigDecimal(@javax.annotation.Nullable BigDecimal bigDecimal) {
    * @return bigDecimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getBigDecimal() {
@@ -463,7 +463,7 @@ public BigDecimal getBigDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBigDecimal(@javax.annotation.Nullable BigDecimal bigDecimal) {
     this.bigDecimal = bigDecimal;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index fab16c721c1c..75462506e6c8 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -48,8 +48,8 @@ public HasOnlyReadOnly() {
    */
   @JsonCreator
   public HasOnlyReadOnly(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar, 
-    @JsonProperty(JSON_PROPERTY_FOO) String foo
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar, 
+    @JsonProperty(value = JSON_PROPERTY_FOO, required = false) String foo
   ) {
     this();
     this.bar = bar;
@@ -61,7 +61,7 @@ public HasOnlyReadOnly(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -75,7 +75,7 @@ public String getBar() {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/MapTest.java
index 226af5128b2b..94020730a719 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/MapTest.java
@@ -109,7 +109,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -117,7 +117,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -142,7 +142,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -150,7 +150,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -175,7 +175,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -183,7 +183,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -208,7 +208,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -216,7 +216,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index be9066f8a227..c515e1506f66 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -64,7 +64,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@javax.annotation.Nullab
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -72,7 +72,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -89,7 +89,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@javax.annotation.Nu
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -97,7 +97,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -122,7 +122,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -130,7 +130,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Model200Response.java
index f445295ef573..cc0125122612 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -55,7 +55,7 @@ public Model200Response name(@javax.annotation.Nullable Integer name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -63,7 +63,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -80,7 +80,7 @@ public Model200Response propertyClass(@javax.annotation.Nullable String property
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -88,7 +88,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 9fce2e1e3bab..4b9ecc77489a 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -60,7 +60,7 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -68,7 +68,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -85,7 +85,7 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -93,7 +93,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -110,7 +110,7 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -118,7 +118,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelFile.java
index b56cda290634..aafab80e041d 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -50,7 +50,7 @@ public ModelFile sourceURI(@javax.annotation.Nullable String sourceURI) {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -58,7 +58,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelList.java
index d0f770be3bdb..2ac93e97b4c5 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelList.java
@@ -50,7 +50,7 @@ public ModelList _123list(@javax.annotation.Nullable String _123list) {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -58,7 +58,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelReturn.java
index a5e4c8656d48..2e06a4c7a467 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -50,7 +50,7 @@ public ModelReturn _return(@javax.annotation.Nullable Integer _return) {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -58,7 +58,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Name.java
index 7c79599ff5d8..ead2b3b3e5f1 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Name.java
@@ -57,8 +57,8 @@ public Name() {
    */
   @JsonCreator
   public Name(
-    @JsonProperty(JSON_PROPERTY_SNAKE_CASE) Integer snakeCase, 
-    @JsonProperty(JSON_PROPERTY_123NUMBER) Integer _123number
+    @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false) Integer snakeCase, 
+    @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false) Integer _123number
   ) {
     this();
     this.snakeCase = snakeCase;
@@ -76,7 +76,7 @@ public Name name(@javax.annotation.Nonnull Integer name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -84,7 +84,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -95,7 +95,7 @@ public void setName(@javax.annotation.Nonnull Integer name) {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -115,7 +115,7 @@ public Name property(@javax.annotation.Nullable String property) {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -123,7 +123,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -134,7 +134,7 @@ public void setProperty(@javax.annotation.Nullable String property) {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/NumberOnly.java
index 2b2688a79089..264e825134f1 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -50,7 +50,7 @@ public NumberOnly justNumber(@javax.annotation.Nullable BigDecimal justNumber) {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -58,7 +58,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Order.java
index 19a6f2e22dd1..075006c47dc6 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Order.java
@@ -112,7 +112,7 @@ public Order id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -120,7 +120,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -137,7 +137,7 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -145,7 +145,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -162,7 +162,7 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -170,7 +170,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -187,7 +187,7 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -195,7 +195,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -212,7 +212,7 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -220,7 +220,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -237,7 +237,7 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -245,7 +245,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/OuterComposite.java
index 7b928ac82f35..14b334e4829a 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -60,7 +60,7 @@ public OuterComposite myNumber(@javax.annotation.Nullable BigDecimal myNumber) {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -68,7 +68,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -85,7 +85,7 @@ public OuterComposite myString(@javax.annotation.Nullable String myString) {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -93,7 +93,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -110,7 +110,7 @@ public OuterComposite myBoolean(@javax.annotation.Nullable Boolean myBoolean) {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -118,7 +118,7 @@ public Boolean getMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Pet.java
index 9c64c19a7c2c..6642f3237661 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Pet.java
@@ -119,7 +119,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -127,7 +127,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -144,7 +144,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -152,7 +152,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -169,7 +169,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -177,7 +177,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -202,7 +202,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -211,7 +211,7 @@ public Set<String> getPhotoUrls() {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -236,7 +236,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -244,7 +244,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -261,7 +261,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -269,7 +269,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 784d47d6a106..eeffca460496 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -47,7 +47,7 @@ public ReadOnlyFirst() {
    */
   @JsonCreator
   public ReadOnlyFirst(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar
   ) {
     this();
     this.bar = bar;
@@ -58,7 +58,7 @@ public ReadOnlyFirst(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -78,7 +78,7 @@ public ReadOnlyFirst baz(@javax.annotation.Nullable String baz) {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -86,7 +86,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 62f2544da2d3..4d2bf7518e90 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -50,7 +50,7 @@ public SpecialModelName() {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -58,7 +58,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Tag.java
index fc2ee7bfc564..83ece7141a46 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Tag.java
@@ -54,7 +54,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/TypeHolderDefault.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
index 59435e41e0bd..c34d335d9a53 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
@@ -73,7 +73,7 @@ public TypeHolderDefault stringItem(@javax.annotation.Nonnull String stringItem)
    * @return stringItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -81,7 +81,7 @@ public String getStringItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -98,7 +98,7 @@ public TypeHolderDefault numberItem(@javax.annotation.Nonnull BigDecimal numberI
    * @return numberItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -106,7 +106,7 @@ public BigDecimal getNumberItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -123,7 +123,7 @@ public TypeHolderDefault integerItem(@javax.annotation.Nonnull Integer integerIt
    * @return integerItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -131,7 +131,7 @@ public Integer getIntegerItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -148,7 +148,7 @@ public TypeHolderDefault boolItem(@javax.annotation.Nonnull Boolean boolItem) {
    * @return boolItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean getBoolItem() {
@@ -156,7 +156,7 @@ public Boolean getBoolItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -181,7 +181,7 @@ public TypeHolderDefault addArrayItemItem(Integer arrayItemItem) {
    * @return arrayItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -189,7 +189,7 @@ public List<Integer> getArrayItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/TypeHolderExample.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/TypeHolderExample.java
index 952e5a73f2ef..c170ffebe32b 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/TypeHolderExample.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/TypeHolderExample.java
@@ -78,7 +78,7 @@ public TypeHolderExample stringItem(@javax.annotation.Nonnull String stringItem)
    * @return stringItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -86,7 +86,7 @@ public String getStringItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -103,7 +103,7 @@ public TypeHolderExample numberItem(@javax.annotation.Nonnull BigDecimal numberI
    * @return numberItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -111,7 +111,7 @@ public BigDecimal getNumberItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -128,7 +128,7 @@ public TypeHolderExample floatItem(@javax.annotation.Nonnull Float floatItem) {
    * @return floatItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Float getFloatItem() {
@@ -136,7 +136,7 @@ public Float getFloatItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setFloatItem(@javax.annotation.Nonnull Float floatItem) {
     this.floatItem = floatItem;
@@ -153,7 +153,7 @@ public TypeHolderExample integerItem(@javax.annotation.Nonnull Integer integerIt
    * @return integerItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -161,7 +161,7 @@ public Integer getIntegerItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -178,7 +178,7 @@ public TypeHolderExample boolItem(@javax.annotation.Nonnull Boolean boolItem) {
    * @return boolItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean getBoolItem() {
@@ -186,7 +186,7 @@ public Boolean getBoolItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -211,7 +211,7 @@ public TypeHolderExample addArrayItemItem(Integer arrayItemItem) {
    * @return arrayItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -219,7 +219,7 @@ public List<Integer> getArrayItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/User.java
index 4aa0d35c2889..7a457acb78ba 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/User.java
@@ -84,7 +84,7 @@ public User id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -92,7 +92,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -109,7 +109,7 @@ public User username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -117,7 +117,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -134,7 +134,7 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -142,7 +142,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -159,7 +159,7 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -167,7 +167,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -184,7 +184,7 @@ public User email(@javax.annotation.Nullable String email) {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -192,7 +192,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -209,7 +209,7 @@ public User password(@javax.annotation.Nullable String password) {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -217,7 +217,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -234,7 +234,7 @@ public User phone(@javax.annotation.Nullable String phone) {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -242,7 +242,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -259,7 +259,7 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -267,7 +267,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/XmlItem.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/XmlItem.java
index af00bcc3538b..cdb509cf8e06 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/XmlItem.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/XmlItem.java
@@ -193,7 +193,7 @@ public XmlItem attributeString(@javax.annotation.Nullable String attributeString
    * @return attributeString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAttributeString() {
@@ -201,7 +201,7 @@ public String getAttributeString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeString(@javax.annotation.Nullable String attributeString) {
     this.attributeString = attributeString;
@@ -218,7 +218,7 @@ public XmlItem attributeNumber(@javax.annotation.Nullable BigDecimal attributeNu
    * @return attributeNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getAttributeNumber() {
@@ -226,7 +226,7 @@ public BigDecimal getAttributeNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeNumber(@javax.annotation.Nullable BigDecimal attributeNumber) {
     this.attributeNumber = attributeNumber;
@@ -243,7 +243,7 @@ public XmlItem attributeInteger(@javax.annotation.Nullable Integer attributeInte
    * @return attributeInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getAttributeInteger() {
@@ -251,7 +251,7 @@ public Integer getAttributeInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeInteger(@javax.annotation.Nullable Integer attributeInteger) {
     this.attributeInteger = attributeInteger;
@@ -268,7 +268,7 @@ public XmlItem attributeBoolean(@javax.annotation.Nullable Boolean attributeBool
    * @return attributeBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getAttributeBoolean() {
@@ -276,7 +276,7 @@ public Boolean getAttributeBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeBoolean(@javax.annotation.Nullable Boolean attributeBoolean) {
     this.attributeBoolean = attributeBoolean;
@@ -301,7 +301,7 @@ public XmlItem addWrappedArrayItem(Integer wrappedArrayItem) {
    * @return wrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getWrappedArray() {
@@ -309,7 +309,7 @@ public List<Integer> getWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setWrappedArray(@javax.annotation.Nullable List<Integer> wrappedArray) {
     this.wrappedArray = wrappedArray;
@@ -326,7 +326,7 @@ public XmlItem nameString(@javax.annotation.Nullable String nameString) {
    * @return nameString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNameString() {
@@ -334,7 +334,7 @@ public String getNameString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameString(@javax.annotation.Nullable String nameString) {
     this.nameString = nameString;
@@ -351,7 +351,7 @@ public XmlItem nameNumber(@javax.annotation.Nullable BigDecimal nameNumber) {
    * @return nameNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNameNumber() {
@@ -359,7 +359,7 @@ public BigDecimal getNameNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameNumber(@javax.annotation.Nullable BigDecimal nameNumber) {
     this.nameNumber = nameNumber;
@@ -376,7 +376,7 @@ public XmlItem nameInteger(@javax.annotation.Nullable Integer nameInteger) {
    * @return nameInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNameInteger() {
@@ -384,7 +384,7 @@ public Integer getNameInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameInteger(@javax.annotation.Nullable Integer nameInteger) {
     this.nameInteger = nameInteger;
@@ -401,7 +401,7 @@ public XmlItem nameBoolean(@javax.annotation.Nullable Boolean nameBoolean) {
    * @return nameBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getNameBoolean() {
@@ -409,7 +409,7 @@ public Boolean getNameBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameBoolean(@javax.annotation.Nullable Boolean nameBoolean) {
     this.nameBoolean = nameBoolean;
@@ -434,7 +434,7 @@ public XmlItem addNameArrayItem(Integer nameArrayItem) {
    * @return nameArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameArray() {
@@ -442,7 +442,7 @@ public List<Integer> getNameArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameArray(@javax.annotation.Nullable List<Integer> nameArray) {
     this.nameArray = nameArray;
@@ -467,7 +467,7 @@ public XmlItem addNameWrappedArrayItem(Integer nameWrappedArrayItem) {
    * @return nameWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameWrappedArray() {
@@ -475,7 +475,7 @@ public List<Integer> getNameWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameWrappedArray(@javax.annotation.Nullable List<Integer> nameWrappedArray) {
     this.nameWrappedArray = nameWrappedArray;
@@ -492,7 +492,7 @@ public XmlItem prefixString(@javax.annotation.Nullable String prefixString) {
    * @return prefixString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixString() {
@@ -500,7 +500,7 @@ public String getPrefixString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixString(@javax.annotation.Nullable String prefixString) {
     this.prefixString = prefixString;
@@ -517,7 +517,7 @@ public XmlItem prefixNumber(@javax.annotation.Nullable BigDecimal prefixNumber)
    * @return prefixNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNumber() {
@@ -525,7 +525,7 @@ public BigDecimal getPrefixNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNumber(@javax.annotation.Nullable BigDecimal prefixNumber) {
     this.prefixNumber = prefixNumber;
@@ -542,7 +542,7 @@ public XmlItem prefixInteger(@javax.annotation.Nullable Integer prefixInteger) {
    * @return prefixInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixInteger() {
@@ -550,7 +550,7 @@ public Integer getPrefixInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixInteger(@javax.annotation.Nullable Integer prefixInteger) {
     this.prefixInteger = prefixInteger;
@@ -567,7 +567,7 @@ public XmlItem prefixBoolean(@javax.annotation.Nullable Boolean prefixBoolean) {
    * @return prefixBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getPrefixBoolean() {
@@ -575,7 +575,7 @@ public Boolean getPrefixBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixBoolean(@javax.annotation.Nullable Boolean prefixBoolean) {
     this.prefixBoolean = prefixBoolean;
@@ -600,7 +600,7 @@ public XmlItem addPrefixArrayItem(Integer prefixArrayItem) {
    * @return prefixArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixArray() {
@@ -608,7 +608,7 @@ public List<Integer> getPrefixArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixArray(@javax.annotation.Nullable List<Integer> prefixArray) {
     this.prefixArray = prefixArray;
@@ -633,7 +633,7 @@ public XmlItem addPrefixWrappedArrayItem(Integer prefixWrappedArrayItem) {
    * @return prefixWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixWrappedArray() {
@@ -641,7 +641,7 @@ public List<Integer> getPrefixWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixWrappedArray(@javax.annotation.Nullable List<Integer> prefixWrappedArray) {
     this.prefixWrappedArray = prefixWrappedArray;
@@ -658,7 +658,7 @@ public XmlItem namespaceString(@javax.annotation.Nullable String namespaceString
    * @return namespaceString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNamespaceString() {
@@ -666,7 +666,7 @@ public String getNamespaceString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceString(@javax.annotation.Nullable String namespaceString) {
     this.namespaceString = namespaceString;
@@ -683,7 +683,7 @@ public XmlItem namespaceNumber(@javax.annotation.Nullable BigDecimal namespaceNu
    * @return namespaceNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNamespaceNumber() {
@@ -691,7 +691,7 @@ public BigDecimal getNamespaceNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceNumber(@javax.annotation.Nullable BigDecimal namespaceNumber) {
     this.namespaceNumber = namespaceNumber;
@@ -708,7 +708,7 @@ public XmlItem namespaceInteger(@javax.annotation.Nullable Integer namespaceInte
    * @return namespaceInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNamespaceInteger() {
@@ -716,7 +716,7 @@ public Integer getNamespaceInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceInteger(@javax.annotation.Nullable Integer namespaceInteger) {
     this.namespaceInteger = namespaceInteger;
@@ -733,7 +733,7 @@ public XmlItem namespaceBoolean(@javax.annotation.Nullable Boolean namespaceBool
    * @return namespaceBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getNamespaceBoolean() {
@@ -741,7 +741,7 @@ public Boolean getNamespaceBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceBoolean(@javax.annotation.Nullable Boolean namespaceBoolean) {
     this.namespaceBoolean = namespaceBoolean;
@@ -766,7 +766,7 @@ public XmlItem addNamespaceArrayItem(Integer namespaceArrayItem) {
    * @return namespaceArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceArray() {
@@ -774,7 +774,7 @@ public List<Integer> getNamespaceArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceArray(@javax.annotation.Nullable List<Integer> namespaceArray) {
     this.namespaceArray = namespaceArray;
@@ -799,7 +799,7 @@ public XmlItem addNamespaceWrappedArrayItem(Integer namespaceWrappedArrayItem) {
    * @return namespaceWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceWrappedArray() {
@@ -807,7 +807,7 @@ public List<Integer> getNamespaceWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceWrappedArray(@javax.annotation.Nullable List<Integer> namespaceWrappedArray) {
     this.namespaceWrappedArray = namespaceWrappedArray;
@@ -824,7 +824,7 @@ public XmlItem prefixNsString(@javax.annotation.Nullable String prefixNsString)
    * @return prefixNsString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixNsString() {
@@ -832,7 +832,7 @@ public String getPrefixNsString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsString(@javax.annotation.Nullable String prefixNsString) {
     this.prefixNsString = prefixNsString;
@@ -849,7 +849,7 @@ public XmlItem prefixNsNumber(@javax.annotation.Nullable BigDecimal prefixNsNumb
    * @return prefixNsNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNsNumber() {
@@ -857,7 +857,7 @@ public BigDecimal getPrefixNsNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsNumber(@javax.annotation.Nullable BigDecimal prefixNsNumber) {
     this.prefixNsNumber = prefixNsNumber;
@@ -874,7 +874,7 @@ public XmlItem prefixNsInteger(@javax.annotation.Nullable Integer prefixNsIntege
    * @return prefixNsInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixNsInteger() {
@@ -882,7 +882,7 @@ public Integer getPrefixNsInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsInteger(@javax.annotation.Nullable Integer prefixNsInteger) {
     this.prefixNsInteger = prefixNsInteger;
@@ -899,7 +899,7 @@ public XmlItem prefixNsBoolean(@javax.annotation.Nullable Boolean prefixNsBoolea
    * @return prefixNsBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getPrefixNsBoolean() {
@@ -907,7 +907,7 @@ public Boolean getPrefixNsBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsBoolean(@javax.annotation.Nullable Boolean prefixNsBoolean) {
     this.prefixNsBoolean = prefixNsBoolean;
@@ -932,7 +932,7 @@ public XmlItem addPrefixNsArrayItem(Integer prefixNsArrayItem) {
    * @return prefixNsArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsArray() {
@@ -940,7 +940,7 @@ public List<Integer> getPrefixNsArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsArray(@javax.annotation.Nullable List<Integer> prefixNsArray) {
     this.prefixNsArray = prefixNsArray;
@@ -965,7 +965,7 @@ public XmlItem addPrefixNsWrappedArrayItem(Integer prefixNsWrappedArrayItem) {
    * @return prefixNsWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsWrappedArray() {
@@ -973,7 +973,7 @@ public List<Integer> getPrefixNsWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsWrappedArray(@javax.annotation.Nullable List<Integer> prefixNsWrappedArray) {
     this.prefixNsWrappedArray = prefixNsWrappedArray;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
index 4f0efe25c1ce..a696ecb53b71 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
@@ -55,7 +55,7 @@ public AdditionalPropertiesAnyType name(@javax.annotation.Nullable String name)
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -63,7 +63,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
index e8b4b56c5b17..00662e5f093d 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
@@ -56,7 +56,7 @@ public AdditionalPropertiesArray name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
index 4b51b315dda1..266ace2a7579 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
@@ -55,7 +55,7 @@ public AdditionalPropertiesBoolean name(@javax.annotation.Nullable String name)
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -63,7 +63,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 2dfaf8914e27..ee8f4c1aa53b 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -113,7 +113,7 @@ public AdditionalPropertiesClass putMapStringItem(String key, String mapStringIt
    * @return mapString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapString() {
@@ -121,7 +121,7 @@ public Map<String, String> getMapString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapString(@javax.annotation.Nullable Map<String, String> mapString) {
     this.mapString = mapString;
@@ -146,7 +146,7 @@ public AdditionalPropertiesClass putMapNumberItem(String key, BigDecimal mapNumb
    * @return mapNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getMapNumber() {
@@ -154,7 +154,7 @@ public Map<String, BigDecimal> getMapNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapNumber(@javax.annotation.Nullable Map<String, BigDecimal> mapNumber) {
     this.mapNumber = mapNumber;
@@ -179,7 +179,7 @@ public AdditionalPropertiesClass putMapIntegerItem(String key, Integer mapIntege
    * @return mapInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Integer> getMapInteger() {
@@ -187,7 +187,7 @@ public Map<String, Integer> getMapInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapInteger(@javax.annotation.Nullable Map<String, Integer> mapInteger) {
     this.mapInteger = mapInteger;
@@ -212,7 +212,7 @@ public AdditionalPropertiesClass putMapBooleanItem(String key, Boolean mapBoolea
    * @return mapBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getMapBoolean() {
@@ -220,7 +220,7 @@ public Map<String, Boolean> getMapBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapBoolean(@javax.annotation.Nullable Map<String, Boolean> mapBoolean) {
     this.mapBoolean = mapBoolean;
@@ -245,7 +245,7 @@ public AdditionalPropertiesClass putMapArrayIntegerItem(String key, List<Integer
    * @return mapArrayInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Integer>> getMapArrayInteger() {
@@ -253,7 +253,7 @@ public Map<String, List<Integer>> getMapArrayInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayInteger(@javax.annotation.Nullable Map<String, List<Integer>> mapArrayInteger) {
     this.mapArrayInteger = mapArrayInteger;
@@ -278,7 +278,7 @@ public AdditionalPropertiesClass putMapArrayAnytypeItem(String key, List<Object>
    * @return mapArrayAnytype
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Object>> getMapArrayAnytype() {
@@ -286,7 +286,7 @@ public Map<String, List<Object>> getMapArrayAnytype() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayAnytype(@javax.annotation.Nullable Map<String, List<Object>> mapArrayAnytype) {
     this.mapArrayAnytype = mapArrayAnytype;
@@ -311,7 +311,7 @@ public AdditionalPropertiesClass putMapMapStringItem(String key, Map<String, Str
    * @return mapMapString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapString() {
@@ -319,7 +319,7 @@ public Map<String, Map<String, String>> getMapMapString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapString) {
     this.mapMapString = mapMapString;
@@ -344,7 +344,7 @@ public AdditionalPropertiesClass putMapMapAnytypeItem(String key, Map<String, Ob
    * @return mapMapAnytype
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, Object>> getMapMapAnytype() {
@@ -352,7 +352,7 @@ public Map<String, Map<String, Object>> getMapMapAnytype() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapAnytype(@javax.annotation.Nullable Map<String, Map<String, Object>> mapMapAnytype) {
     this.mapMapAnytype = mapMapAnytype;
@@ -369,7 +369,7 @@ public AdditionalPropertiesClass anytype1(@javax.annotation.Nullable Object anyt
    * @return anytype1
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype1() {
@@ -377,7 +377,7 @@ public Object getAnytype1() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype1(@javax.annotation.Nullable Object anytype1) {
     this.anytype1 = anytype1;
@@ -394,7 +394,7 @@ public AdditionalPropertiesClass anytype2(@javax.annotation.Nullable Object anyt
    * @return anytype2
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype2() {
@@ -402,7 +402,7 @@ public Object getAnytype2() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype2(@javax.annotation.Nullable Object anytype2) {
     this.anytype2 = anytype2;
@@ -419,7 +419,7 @@ public AdditionalPropertiesClass anytype3(@javax.annotation.Nullable Object anyt
    * @return anytype3
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype3() {
@@ -427,7 +427,7 @@ public Object getAnytype3() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype3(@javax.annotation.Nullable Object anytype3) {
     this.anytype3 = anytype3;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
index d2844615adfb..0dc9281501ba 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
@@ -55,7 +55,7 @@ public AdditionalPropertiesInteger name(@javax.annotation.Nullable String name)
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -63,7 +63,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
index 4bcd92f51b06..b9277443b1d2 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
@@ -56,7 +56,7 @@ public AdditionalPropertiesNumber name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
index b326c9dcd84e..b1a4275124d6 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
@@ -56,7 +56,7 @@ public AdditionalPropertiesObject name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
index 4516b455ad87..44732475174a 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
@@ -55,7 +55,7 @@ public AdditionalPropertiesString name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -63,7 +63,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Animal.java
index c5f45f76a3bb..c7fe346559a9 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Animal.java
@@ -70,7 +70,7 @@ public Animal className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -78,7 +78,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -95,7 +95,7 @@ public Animal color(@javax.annotation.Nullable String color) {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -103,7 +103,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index cf4ba44c209a..31b3ce0c82ee 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -70,7 +70,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 0644a72ec8ad..b0c542547f37 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -70,7 +70,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayTest.java
index 21359069849e..999b8b316a8e 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -72,7 +72,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -80,7 +80,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -105,7 +105,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -113,7 +113,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -138,7 +138,7 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -146,7 +146,7 @@ public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/BigCat.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/BigCat.java
index 0c7572958a0a..82001a1bc95e 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/BigCat.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/BigCat.java
@@ -100,7 +100,7 @@ public BigCat kind(@javax.annotation.Nullable KindEnum kind) {
    * @return kind
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public KindEnum getKind() {
@@ -108,7 +108,7 @@ public KindEnum getKind() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setKind(@javax.annotation.Nullable KindEnum kind) {
     this.kind = kind;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Capitalization.java
index 5ff61b49a08c..44ae15d4d8dd 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -76,7 +76,7 @@ public Capitalization smallCamel(@javax.annotation.Nullable String smallCamel) {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -84,7 +84,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -101,7 +101,7 @@ public Capitalization capitalCamel(@javax.annotation.Nullable String capitalCame
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -109,7 +109,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -126,7 +126,7 @@ public Capitalization smallSnake(@javax.annotation.Nullable String smallSnake) {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -134,7 +134,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -151,7 +151,7 @@ public Capitalization capitalSnake(@javax.annotation.Nullable String capitalSnak
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -159,7 +159,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -176,7 +176,7 @@ public Capitalization scAETHFlowPoints(@javax.annotation.Nullable String scAETHF
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -184,7 +184,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -201,7 +201,7 @@ public Capitalization ATT_NAME(@javax.annotation.Nullable String ATT_NAME) {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -209,7 +209,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Cat.java
index 1b2f8018387f..8f13e7b052fe 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Cat.java
@@ -64,7 +64,7 @@ public Cat declawed(@javax.annotation.Nullable Boolean declawed) {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -72,7 +72,7 @@ public Boolean getDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Category.java
index 566a6a84f6c2..5dd8aa4a3272 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Category.java
@@ -56,7 +56,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -64,7 +64,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -81,7 +81,7 @@ public Category name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -89,7 +89,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ClassModel.java
index 3a6f13aeaa82..e5d2d7f429be 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -51,7 +51,7 @@ public ClassModel propertyClass(@javax.annotation.Nullable String propertyClass)
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -59,7 +59,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Client.java
index 1fb37094dafa..641d7a417a24 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Client.java
@@ -51,7 +51,7 @@ public Client client(@javax.annotation.Nullable String client) {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -59,7 +59,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Dog.java
index 2305e19ef2b0..d2532908e7b4 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Dog.java
@@ -61,7 +61,7 @@ public Dog breed(@javax.annotation.Nullable String breed) {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -69,7 +69,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/EnumArrays.java
index 04b06119cff9..d51f3e032486 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -128,7 +128,7 @@ public EnumArrays justSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbo
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -136,7 +136,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -161,7 +161,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -169,7 +169,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/EnumTest.java
index 0c0684107a8e..5a7eb8f3178a 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -217,7 +217,7 @@ public EnumTest enumString(@javax.annotation.Nullable EnumStringEnum enumString)
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -225,7 +225,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -242,7 +242,7 @@ public EnumTest enumStringRequired(@javax.annotation.Nonnull EnumStringRequiredE
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -250,7 +250,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -267,7 +267,7 @@ public EnumTest enumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteg
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -275,7 +275,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -292,7 +292,7 @@ public EnumTest enumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber)
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -300,7 +300,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -317,7 +317,7 @@ public EnumTest outerEnum(@javax.annotation.Nullable OuterEnum outerEnum) {
    * @return outerEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnum getOuterEnum() {
@@ -325,7 +325,7 @@ public OuterEnum getOuterEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnum(@javax.annotation.Nullable OuterEnum outerEnum) {
     this.outerEnum = outerEnum;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 312b378814ec..e97860bd7ebe 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -59,7 +59,7 @@ public FileSchemaTestClass _file(@javax.annotation.Nullable ModelFile _file) {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -67,7 +67,7 @@ public ModelFile getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -92,7 +92,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -100,7 +100,7 @@ public List<ModelFile> getFiles() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/FormatTest.java
index fbfcf902ab71..2ce71629ff9a 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -124,7 +124,7 @@ public FormatTest integer(@javax.annotation.Nullable Integer integer) {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -132,7 +132,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -151,7 +151,7 @@ public FormatTest int32(@javax.annotation.Nullable Integer int32) {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -159,7 +159,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -176,7 +176,7 @@ public FormatTest int64(@javax.annotation.Nullable Long int64) {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -184,7 +184,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -203,7 +203,7 @@ public FormatTest number(@javax.annotation.Nonnull BigDecimal number) {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -211,7 +211,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -230,7 +230,7 @@ public FormatTest _float(@javax.annotation.Nullable Float _float) {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -238,7 +238,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -257,7 +257,7 @@ public FormatTest _double(@javax.annotation.Nullable Double _double) {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -265,7 +265,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -282,7 +282,7 @@ public FormatTest string(@javax.annotation.Nullable String string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -290,7 +290,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -307,7 +307,7 @@ public FormatTest _byte(@javax.annotation.Nonnull byte[] _byte) {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -315,7 +315,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -332,7 +332,7 @@ public FormatTest binary(@javax.annotation.Nullable File binary) {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -340,7 +340,7 @@ public File getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -357,7 +357,7 @@ public FormatTest date(@javax.annotation.Nonnull LocalDate date) {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -365,7 +365,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -382,7 +382,7 @@ public FormatTest dateTime(@javax.annotation.Nullable LocalDateTime dateTime) {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public LocalDateTime getDateTime() {
@@ -390,7 +390,7 @@ public LocalDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable LocalDateTime dateTime) {
     this.dateTime = dateTime;
@@ -407,7 +407,7 @@ public FormatTest uuid(@javax.annotation.Nullable UUID uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -415,7 +415,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -432,7 +432,7 @@ public FormatTest password(@javax.annotation.Nonnull String password) {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -440,7 +440,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -457,7 +457,7 @@ public FormatTest bigDecimal(@javax.annotation.Nullable BigDecimal bigDecimal) {
    * @return bigDecimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getBigDecimal() {
@@ -465,7 +465,7 @@ public BigDecimal getBigDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBigDecimal(@javax.annotation.Nullable BigDecimal bigDecimal) {
     this.bigDecimal = bigDecimal;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 476a3fefee0c..0b2e7ecb6ccc 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -62,7 +62,7 @@ public HasOnlyReadOnly(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -77,7 +77,7 @@ public String getBar() {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/MapTest.java
index 305346b28dee..4c47b26893d1 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/MapTest.java
@@ -111,7 +111,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -119,7 +119,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -144,7 +144,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -152,7 +152,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -177,7 +177,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -185,7 +185,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -210,7 +210,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -218,7 +218,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index d9369fe001f1..fb470fe2ad86 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -66,7 +66,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@javax.annotation.Nullab
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -74,7 +74,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -91,7 +91,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@javax.annotation.Nu
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public LocalDateTime getDateTime() {
@@ -99,7 +99,7 @@ public LocalDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable LocalDateTime dateTime) {
     this.dateTime = dateTime;
@@ -124,7 +124,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -132,7 +132,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Model200Response.java
index d467daad3541..2b673f325409 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -57,7 +57,7 @@ public Model200Response name(@javax.annotation.Nullable Integer name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -65,7 +65,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -82,7 +82,7 @@ public Model200Response propertyClass(@javax.annotation.Nullable String property
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -90,7 +90,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 351c62bac8b9..d449a5952227 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -62,7 +62,7 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -70,7 +70,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -87,7 +87,7 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -95,7 +95,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -112,7 +112,7 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -120,7 +120,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelFile.java
index 816fc4fa0064..8d5f51659eb6 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -52,7 +52,7 @@ public ModelFile sourceURI(@javax.annotation.Nullable String sourceURI) {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -60,7 +60,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelList.java
index 65a566ce5e83..8c2fbabc55ff 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelList.java
@@ -52,7 +52,7 @@ public ModelList _123list(@javax.annotation.Nullable String _123list) {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -60,7 +60,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelReturn.java
index 79a6baa30dee..7ae7ccb5a135 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -52,7 +52,7 @@ public ModelReturn _return(@javax.annotation.Nullable Integer _return) {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -60,7 +60,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Name.java
index a8d62707df8b..98faf0055bb8 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Name.java
@@ -76,7 +76,7 @@ public Name name(@javax.annotation.Nonnull Integer name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -84,7 +84,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -96,7 +96,7 @@ public void setName(@javax.annotation.Nonnull Integer name) {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -116,7 +116,7 @@ public Name property(@javax.annotation.Nullable String property) {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -124,7 +124,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -136,7 +136,7 @@ public void setProperty(@javax.annotation.Nullable String property) {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/NumberOnly.java
index 5c82b27291fa..1b802b71cae7 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -52,7 +52,7 @@ public NumberOnly justNumber(@javax.annotation.Nullable BigDecimal justNumber) {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -60,7 +60,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Order.java
index be54733fa2b0..ea26cc9665f0 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Order.java
@@ -114,7 +114,7 @@ public Order id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -122,7 +122,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -139,7 +139,7 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -147,7 +147,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -164,7 +164,7 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -172,7 +172,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -189,7 +189,7 @@ public Order shipDate(@javax.annotation.Nullable LocalDateTime shipDate) {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public LocalDateTime getShipDate() {
@@ -197,7 +197,7 @@ public LocalDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable LocalDateTime shipDate) {
     this.shipDate = shipDate;
@@ -214,7 +214,7 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -222,7 +222,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -239,7 +239,7 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -247,7 +247,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/OuterComposite.java
index 3f2e4b03f92e..bbd2fd96b114 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -62,7 +62,7 @@ public OuterComposite myNumber(@javax.annotation.Nullable BigDecimal myNumber) {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -70,7 +70,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -87,7 +87,7 @@ public OuterComposite myString(@javax.annotation.Nullable String myString) {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -95,7 +95,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -112,7 +112,7 @@ public OuterComposite myBoolean(@javax.annotation.Nullable Boolean myBoolean) {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -120,7 +120,7 @@ public Boolean getMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Pet.java
index c1723ce2eb9c..bbada0565220 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,7 +120,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -128,7 +128,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -145,7 +145,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -153,7 +153,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -170,7 +170,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -178,7 +178,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -203,7 +203,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -212,7 +212,7 @@ public Set<String> getPhotoUrls() {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -237,7 +237,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -245,7 +245,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -262,7 +262,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -270,7 +270,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index babde0bf76b7..362a6723e6d0 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -59,7 +59,7 @@ public ReadOnlyFirst(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -79,7 +79,7 @@ public ReadOnlyFirst baz(@javax.annotation.Nullable String baz) {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -87,7 +87,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 95f0e6c94565..358711cab17b 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -52,7 +52,7 @@ public SpecialModelName() {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -60,7 +60,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Tag.java
index 6ae76dc3ab77..9a5bea0d753c 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Tag.java
@@ -56,7 +56,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -64,7 +64,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -81,7 +81,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -89,7 +89,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/TypeHolderDefault.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
index 7c79d169424c..ab4fada17762 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
@@ -74,7 +74,7 @@ public TypeHolderDefault stringItem(@javax.annotation.Nonnull String stringItem)
    * @return stringItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -82,7 +82,7 @@ public String getStringItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -99,7 +99,7 @@ public TypeHolderDefault numberItem(@javax.annotation.Nonnull BigDecimal numberI
    * @return numberItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -107,7 +107,7 @@ public BigDecimal getNumberItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -124,7 +124,7 @@ public TypeHolderDefault integerItem(@javax.annotation.Nonnull Integer integerIt
    * @return integerItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -132,7 +132,7 @@ public Integer getIntegerItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -149,7 +149,7 @@ public TypeHolderDefault boolItem(@javax.annotation.Nonnull Boolean boolItem) {
    * @return boolItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean getBoolItem() {
@@ -157,7 +157,7 @@ public Boolean getBoolItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -182,7 +182,7 @@ public TypeHolderDefault addArrayItemItem(Integer arrayItemItem) {
    * @return arrayItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -190,7 +190,7 @@ public List<Integer> getArrayItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/TypeHolderExample.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/TypeHolderExample.java
index 9d3ae7f8a7f1..e0c6060f3db9 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/TypeHolderExample.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/TypeHolderExample.java
@@ -79,7 +79,7 @@ public TypeHolderExample stringItem(@javax.annotation.Nonnull String stringItem)
    * @return stringItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -87,7 +87,7 @@ public String getStringItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -104,7 +104,7 @@ public TypeHolderExample numberItem(@javax.annotation.Nonnull BigDecimal numberI
    * @return numberItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -112,7 +112,7 @@ public BigDecimal getNumberItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -129,7 +129,7 @@ public TypeHolderExample floatItem(@javax.annotation.Nonnull Float floatItem) {
    * @return floatItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Float getFloatItem() {
@@ -137,7 +137,7 @@ public Float getFloatItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setFloatItem(@javax.annotation.Nonnull Float floatItem) {
     this.floatItem = floatItem;
@@ -154,7 +154,7 @@ public TypeHolderExample integerItem(@javax.annotation.Nonnull Integer integerIt
    * @return integerItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -162,7 +162,7 @@ public Integer getIntegerItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -179,7 +179,7 @@ public TypeHolderExample boolItem(@javax.annotation.Nonnull Boolean boolItem) {
    * @return boolItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean getBoolItem() {
@@ -187,7 +187,7 @@ public Boolean getBoolItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -212,7 +212,7 @@ public TypeHolderExample addArrayItemItem(Integer arrayItemItem) {
    * @return arrayItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -220,7 +220,7 @@ public List<Integer> getArrayItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/User.java
index 548915ebcb47..dc565ff2ce7c 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/User.java
@@ -86,7 +86,7 @@ public User id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -94,7 +94,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -111,7 +111,7 @@ public User username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -119,7 +119,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -136,7 +136,7 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -144,7 +144,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -161,7 +161,7 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -169,7 +169,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -186,7 +186,7 @@ public User email(@javax.annotation.Nullable String email) {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -194,7 +194,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -211,7 +211,7 @@ public User password(@javax.annotation.Nullable String password) {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -219,7 +219,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -236,7 +236,7 @@ public User phone(@javax.annotation.Nullable String phone) {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -244,7 +244,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -261,7 +261,7 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -269,7 +269,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/XmlItem.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/XmlItem.java
index f006ea5fdb4b..1e0d9e47b00b 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/XmlItem.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/XmlItem.java
@@ -194,7 +194,7 @@ public XmlItem attributeString(@javax.annotation.Nullable String attributeString
    * @return attributeString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAttributeString() {
@@ -202,7 +202,7 @@ public String getAttributeString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeString(@javax.annotation.Nullable String attributeString) {
     this.attributeString = attributeString;
@@ -219,7 +219,7 @@ public XmlItem attributeNumber(@javax.annotation.Nullable BigDecimal attributeNu
    * @return attributeNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getAttributeNumber() {
@@ -227,7 +227,7 @@ public BigDecimal getAttributeNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeNumber(@javax.annotation.Nullable BigDecimal attributeNumber) {
     this.attributeNumber = attributeNumber;
@@ -244,7 +244,7 @@ public XmlItem attributeInteger(@javax.annotation.Nullable Integer attributeInte
    * @return attributeInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getAttributeInteger() {
@@ -252,7 +252,7 @@ public Integer getAttributeInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeInteger(@javax.annotation.Nullable Integer attributeInteger) {
     this.attributeInteger = attributeInteger;
@@ -269,7 +269,7 @@ public XmlItem attributeBoolean(@javax.annotation.Nullable Boolean attributeBool
    * @return attributeBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getAttributeBoolean() {
@@ -277,7 +277,7 @@ public Boolean getAttributeBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeBoolean(@javax.annotation.Nullable Boolean attributeBoolean) {
     this.attributeBoolean = attributeBoolean;
@@ -302,7 +302,7 @@ public XmlItem addWrappedArrayItem(Integer wrappedArrayItem) {
    * @return wrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getWrappedArray() {
@@ -310,7 +310,7 @@ public List<Integer> getWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setWrappedArray(@javax.annotation.Nullable List<Integer> wrappedArray) {
     this.wrappedArray = wrappedArray;
@@ -327,7 +327,7 @@ public XmlItem nameString(@javax.annotation.Nullable String nameString) {
    * @return nameString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNameString() {
@@ -335,7 +335,7 @@ public String getNameString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameString(@javax.annotation.Nullable String nameString) {
     this.nameString = nameString;
@@ -352,7 +352,7 @@ public XmlItem nameNumber(@javax.annotation.Nullable BigDecimal nameNumber) {
    * @return nameNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNameNumber() {
@@ -360,7 +360,7 @@ public BigDecimal getNameNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameNumber(@javax.annotation.Nullable BigDecimal nameNumber) {
     this.nameNumber = nameNumber;
@@ -377,7 +377,7 @@ public XmlItem nameInteger(@javax.annotation.Nullable Integer nameInteger) {
    * @return nameInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNameInteger() {
@@ -385,7 +385,7 @@ public Integer getNameInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameInteger(@javax.annotation.Nullable Integer nameInteger) {
     this.nameInteger = nameInteger;
@@ -402,7 +402,7 @@ public XmlItem nameBoolean(@javax.annotation.Nullable Boolean nameBoolean) {
    * @return nameBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getNameBoolean() {
@@ -410,7 +410,7 @@ public Boolean getNameBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameBoolean(@javax.annotation.Nullable Boolean nameBoolean) {
     this.nameBoolean = nameBoolean;
@@ -435,7 +435,7 @@ public XmlItem addNameArrayItem(Integer nameArrayItem) {
    * @return nameArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameArray() {
@@ -443,7 +443,7 @@ public List<Integer> getNameArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameArray(@javax.annotation.Nullable List<Integer> nameArray) {
     this.nameArray = nameArray;
@@ -468,7 +468,7 @@ public XmlItem addNameWrappedArrayItem(Integer nameWrappedArrayItem) {
    * @return nameWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameWrappedArray() {
@@ -476,7 +476,7 @@ public List<Integer> getNameWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameWrappedArray(@javax.annotation.Nullable List<Integer> nameWrappedArray) {
     this.nameWrappedArray = nameWrappedArray;
@@ -493,7 +493,7 @@ public XmlItem prefixString(@javax.annotation.Nullable String prefixString) {
    * @return prefixString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixString() {
@@ -501,7 +501,7 @@ public String getPrefixString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixString(@javax.annotation.Nullable String prefixString) {
     this.prefixString = prefixString;
@@ -518,7 +518,7 @@ public XmlItem prefixNumber(@javax.annotation.Nullable BigDecimal prefixNumber)
    * @return prefixNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNumber() {
@@ -526,7 +526,7 @@ public BigDecimal getPrefixNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNumber(@javax.annotation.Nullable BigDecimal prefixNumber) {
     this.prefixNumber = prefixNumber;
@@ -543,7 +543,7 @@ public XmlItem prefixInteger(@javax.annotation.Nullable Integer prefixInteger) {
    * @return prefixInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixInteger() {
@@ -551,7 +551,7 @@ public Integer getPrefixInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixInteger(@javax.annotation.Nullable Integer prefixInteger) {
     this.prefixInteger = prefixInteger;
@@ -568,7 +568,7 @@ public XmlItem prefixBoolean(@javax.annotation.Nullable Boolean prefixBoolean) {
    * @return prefixBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getPrefixBoolean() {
@@ -576,7 +576,7 @@ public Boolean getPrefixBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixBoolean(@javax.annotation.Nullable Boolean prefixBoolean) {
     this.prefixBoolean = prefixBoolean;
@@ -601,7 +601,7 @@ public XmlItem addPrefixArrayItem(Integer prefixArrayItem) {
    * @return prefixArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixArray() {
@@ -609,7 +609,7 @@ public List<Integer> getPrefixArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixArray(@javax.annotation.Nullable List<Integer> prefixArray) {
     this.prefixArray = prefixArray;
@@ -634,7 +634,7 @@ public XmlItem addPrefixWrappedArrayItem(Integer prefixWrappedArrayItem) {
    * @return prefixWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixWrappedArray() {
@@ -642,7 +642,7 @@ public List<Integer> getPrefixWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixWrappedArray(@javax.annotation.Nullable List<Integer> prefixWrappedArray) {
     this.prefixWrappedArray = prefixWrappedArray;
@@ -659,7 +659,7 @@ public XmlItem namespaceString(@javax.annotation.Nullable String namespaceString
    * @return namespaceString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNamespaceString() {
@@ -667,7 +667,7 @@ public String getNamespaceString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceString(@javax.annotation.Nullable String namespaceString) {
     this.namespaceString = namespaceString;
@@ -684,7 +684,7 @@ public XmlItem namespaceNumber(@javax.annotation.Nullable BigDecimal namespaceNu
    * @return namespaceNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNamespaceNumber() {
@@ -692,7 +692,7 @@ public BigDecimal getNamespaceNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceNumber(@javax.annotation.Nullable BigDecimal namespaceNumber) {
     this.namespaceNumber = namespaceNumber;
@@ -709,7 +709,7 @@ public XmlItem namespaceInteger(@javax.annotation.Nullable Integer namespaceInte
    * @return namespaceInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNamespaceInteger() {
@@ -717,7 +717,7 @@ public Integer getNamespaceInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceInteger(@javax.annotation.Nullable Integer namespaceInteger) {
     this.namespaceInteger = namespaceInteger;
@@ -734,7 +734,7 @@ public XmlItem namespaceBoolean(@javax.annotation.Nullable Boolean namespaceBool
    * @return namespaceBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getNamespaceBoolean() {
@@ -742,7 +742,7 @@ public Boolean getNamespaceBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceBoolean(@javax.annotation.Nullable Boolean namespaceBoolean) {
     this.namespaceBoolean = namespaceBoolean;
@@ -767,7 +767,7 @@ public XmlItem addNamespaceArrayItem(Integer namespaceArrayItem) {
    * @return namespaceArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceArray() {
@@ -775,7 +775,7 @@ public List<Integer> getNamespaceArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceArray(@javax.annotation.Nullable List<Integer> namespaceArray) {
     this.namespaceArray = namespaceArray;
@@ -800,7 +800,7 @@ public XmlItem addNamespaceWrappedArrayItem(Integer namespaceWrappedArrayItem) {
    * @return namespaceWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceWrappedArray() {
@@ -808,7 +808,7 @@ public List<Integer> getNamespaceWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceWrappedArray(@javax.annotation.Nullable List<Integer> namespaceWrappedArray) {
     this.namespaceWrappedArray = namespaceWrappedArray;
@@ -825,7 +825,7 @@ public XmlItem prefixNsString(@javax.annotation.Nullable String prefixNsString)
    * @return prefixNsString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixNsString() {
@@ -833,7 +833,7 @@ public String getPrefixNsString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsString(@javax.annotation.Nullable String prefixNsString) {
     this.prefixNsString = prefixNsString;
@@ -850,7 +850,7 @@ public XmlItem prefixNsNumber(@javax.annotation.Nullable BigDecimal prefixNsNumb
    * @return prefixNsNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNsNumber() {
@@ -858,7 +858,7 @@ public BigDecimal getPrefixNsNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsNumber(@javax.annotation.Nullable BigDecimal prefixNsNumber) {
     this.prefixNsNumber = prefixNsNumber;
@@ -875,7 +875,7 @@ public XmlItem prefixNsInteger(@javax.annotation.Nullable Integer prefixNsIntege
    * @return prefixNsInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixNsInteger() {
@@ -883,7 +883,7 @@ public Integer getPrefixNsInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsInteger(@javax.annotation.Nullable Integer prefixNsInteger) {
     this.prefixNsInteger = prefixNsInteger;
@@ -900,7 +900,7 @@ public XmlItem prefixNsBoolean(@javax.annotation.Nullable Boolean prefixNsBoolea
    * @return prefixNsBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getPrefixNsBoolean() {
@@ -908,7 +908,7 @@ public Boolean getPrefixNsBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsBoolean(@javax.annotation.Nullable Boolean prefixNsBoolean) {
     this.prefixNsBoolean = prefixNsBoolean;
@@ -933,7 +933,7 @@ public XmlItem addPrefixNsArrayItem(Integer prefixNsArrayItem) {
    * @return prefixNsArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsArray() {
@@ -941,7 +941,7 @@ public List<Integer> getPrefixNsArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsArray(@javax.annotation.Nullable List<Integer> prefixNsArray) {
     this.prefixNsArray = prefixNsArray;
@@ -966,7 +966,7 @@ public XmlItem addPrefixNsWrappedArrayItem(Integer prefixNsWrappedArrayItem) {
    * @return prefixNsWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsWrappedArray() {
@@ -974,7 +974,7 @@ public List<Integer> getPrefixNsWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsWrappedArray(@javax.annotation.Nullable List<Integer> prefixNsWrappedArray) {
     this.prefixNsWrappedArray = prefixNsWrappedArray;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
index 4f0efe25c1ce..a696ecb53b71 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
@@ -55,7 +55,7 @@ public AdditionalPropertiesAnyType name(@javax.annotation.Nullable String name)
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -63,7 +63,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
index e8b4b56c5b17..00662e5f093d 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
@@ -56,7 +56,7 @@ public AdditionalPropertiesArray name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
index 4b51b315dda1..266ace2a7579 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
@@ -55,7 +55,7 @@ public AdditionalPropertiesBoolean name(@javax.annotation.Nullable String name)
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -63,7 +63,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 2dfaf8914e27..ee8f4c1aa53b 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -113,7 +113,7 @@ public AdditionalPropertiesClass putMapStringItem(String key, String mapStringIt
    * @return mapString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapString() {
@@ -121,7 +121,7 @@ public Map<String, String> getMapString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapString(@javax.annotation.Nullable Map<String, String> mapString) {
     this.mapString = mapString;
@@ -146,7 +146,7 @@ public AdditionalPropertiesClass putMapNumberItem(String key, BigDecimal mapNumb
    * @return mapNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getMapNumber() {
@@ -154,7 +154,7 @@ public Map<String, BigDecimal> getMapNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapNumber(@javax.annotation.Nullable Map<String, BigDecimal> mapNumber) {
     this.mapNumber = mapNumber;
@@ -179,7 +179,7 @@ public AdditionalPropertiesClass putMapIntegerItem(String key, Integer mapIntege
    * @return mapInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Integer> getMapInteger() {
@@ -187,7 +187,7 @@ public Map<String, Integer> getMapInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapInteger(@javax.annotation.Nullable Map<String, Integer> mapInteger) {
     this.mapInteger = mapInteger;
@@ -212,7 +212,7 @@ public AdditionalPropertiesClass putMapBooleanItem(String key, Boolean mapBoolea
    * @return mapBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getMapBoolean() {
@@ -220,7 +220,7 @@ public Map<String, Boolean> getMapBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapBoolean(@javax.annotation.Nullable Map<String, Boolean> mapBoolean) {
     this.mapBoolean = mapBoolean;
@@ -245,7 +245,7 @@ public AdditionalPropertiesClass putMapArrayIntegerItem(String key, List<Integer
    * @return mapArrayInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Integer>> getMapArrayInteger() {
@@ -253,7 +253,7 @@ public Map<String, List<Integer>> getMapArrayInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayInteger(@javax.annotation.Nullable Map<String, List<Integer>> mapArrayInteger) {
     this.mapArrayInteger = mapArrayInteger;
@@ -278,7 +278,7 @@ public AdditionalPropertiesClass putMapArrayAnytypeItem(String key, List<Object>
    * @return mapArrayAnytype
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Object>> getMapArrayAnytype() {
@@ -286,7 +286,7 @@ public Map<String, List<Object>> getMapArrayAnytype() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayAnytype(@javax.annotation.Nullable Map<String, List<Object>> mapArrayAnytype) {
     this.mapArrayAnytype = mapArrayAnytype;
@@ -311,7 +311,7 @@ public AdditionalPropertiesClass putMapMapStringItem(String key, Map<String, Str
    * @return mapMapString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapString() {
@@ -319,7 +319,7 @@ public Map<String, Map<String, String>> getMapMapString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapString) {
     this.mapMapString = mapMapString;
@@ -344,7 +344,7 @@ public AdditionalPropertiesClass putMapMapAnytypeItem(String key, Map<String, Ob
    * @return mapMapAnytype
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, Object>> getMapMapAnytype() {
@@ -352,7 +352,7 @@ public Map<String, Map<String, Object>> getMapMapAnytype() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapAnytype(@javax.annotation.Nullable Map<String, Map<String, Object>> mapMapAnytype) {
     this.mapMapAnytype = mapMapAnytype;
@@ -369,7 +369,7 @@ public AdditionalPropertiesClass anytype1(@javax.annotation.Nullable Object anyt
    * @return anytype1
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype1() {
@@ -377,7 +377,7 @@ public Object getAnytype1() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype1(@javax.annotation.Nullable Object anytype1) {
     this.anytype1 = anytype1;
@@ -394,7 +394,7 @@ public AdditionalPropertiesClass anytype2(@javax.annotation.Nullable Object anyt
    * @return anytype2
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype2() {
@@ -402,7 +402,7 @@ public Object getAnytype2() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype2(@javax.annotation.Nullable Object anytype2) {
     this.anytype2 = anytype2;
@@ -419,7 +419,7 @@ public AdditionalPropertiesClass anytype3(@javax.annotation.Nullable Object anyt
    * @return anytype3
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype3() {
@@ -427,7 +427,7 @@ public Object getAnytype3() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype3(@javax.annotation.Nullable Object anytype3) {
     this.anytype3 = anytype3;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
index d2844615adfb..0dc9281501ba 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
@@ -55,7 +55,7 @@ public AdditionalPropertiesInteger name(@javax.annotation.Nullable String name)
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -63,7 +63,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
index 4bcd92f51b06..b9277443b1d2 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
@@ -56,7 +56,7 @@ public AdditionalPropertiesNumber name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
index b326c9dcd84e..b1a4275124d6 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
@@ -56,7 +56,7 @@ public AdditionalPropertiesObject name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
index 4516b455ad87..44732475174a 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
@@ -55,7 +55,7 @@ public AdditionalPropertiesString name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -63,7 +63,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Animal.java
index c5f45f76a3bb..c7fe346559a9 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Animal.java
@@ -70,7 +70,7 @@ public Animal className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -78,7 +78,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -95,7 +95,7 @@ public Animal color(@javax.annotation.Nullable String color) {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -103,7 +103,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index cf4ba44c209a..31b3ce0c82ee 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -70,7 +70,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 0644a72ec8ad..b0c542547f37 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -70,7 +70,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayTest.java
index 21359069849e..999b8b316a8e 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -72,7 +72,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -80,7 +80,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -105,7 +105,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -113,7 +113,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -138,7 +138,7 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -146,7 +146,7 @@ public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BigCat.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BigCat.java
index 0c7572958a0a..82001a1bc95e 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BigCat.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BigCat.java
@@ -100,7 +100,7 @@ public BigCat kind(@javax.annotation.Nullable KindEnum kind) {
    * @return kind
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public KindEnum getKind() {
@@ -108,7 +108,7 @@ public KindEnum getKind() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setKind(@javax.annotation.Nullable KindEnum kind) {
     this.kind = kind;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Capitalization.java
index 5ff61b49a08c..44ae15d4d8dd 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -76,7 +76,7 @@ public Capitalization smallCamel(@javax.annotation.Nullable String smallCamel) {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -84,7 +84,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -101,7 +101,7 @@ public Capitalization capitalCamel(@javax.annotation.Nullable String capitalCame
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -109,7 +109,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -126,7 +126,7 @@ public Capitalization smallSnake(@javax.annotation.Nullable String smallSnake) {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -134,7 +134,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -151,7 +151,7 @@ public Capitalization capitalSnake(@javax.annotation.Nullable String capitalSnak
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -159,7 +159,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -176,7 +176,7 @@ public Capitalization scAETHFlowPoints(@javax.annotation.Nullable String scAETHF
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -184,7 +184,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -201,7 +201,7 @@ public Capitalization ATT_NAME(@javax.annotation.Nullable String ATT_NAME) {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -209,7 +209,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Cat.java
index 1b2f8018387f..8f13e7b052fe 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Cat.java
@@ -64,7 +64,7 @@ public Cat declawed(@javax.annotation.Nullable Boolean declawed) {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -72,7 +72,7 @@ public Boolean getDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Category.java
index 566a6a84f6c2..5dd8aa4a3272 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Category.java
@@ -56,7 +56,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -64,7 +64,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -81,7 +81,7 @@ public Category name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -89,7 +89,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ClassModel.java
index 3a6f13aeaa82..e5d2d7f429be 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -51,7 +51,7 @@ public ClassModel propertyClass(@javax.annotation.Nullable String propertyClass)
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -59,7 +59,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Client.java
index 1fb37094dafa..641d7a417a24 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Client.java
@@ -51,7 +51,7 @@ public Client client(@javax.annotation.Nullable String client) {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -59,7 +59,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Dog.java
index 2305e19ef2b0..d2532908e7b4 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Dog.java
@@ -61,7 +61,7 @@ public Dog breed(@javax.annotation.Nullable String breed) {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -69,7 +69,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumArrays.java
index 04b06119cff9..d51f3e032486 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -128,7 +128,7 @@ public EnumArrays justSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbo
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -136,7 +136,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -161,7 +161,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -169,7 +169,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumTest.java
index 0c0684107a8e..5a7eb8f3178a 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -217,7 +217,7 @@ public EnumTest enumString(@javax.annotation.Nullable EnumStringEnum enumString)
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -225,7 +225,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -242,7 +242,7 @@ public EnumTest enumStringRequired(@javax.annotation.Nonnull EnumStringRequiredE
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -250,7 +250,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -267,7 +267,7 @@ public EnumTest enumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteg
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -275,7 +275,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -292,7 +292,7 @@ public EnumTest enumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber)
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -300,7 +300,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -317,7 +317,7 @@ public EnumTest outerEnum(@javax.annotation.Nullable OuterEnum outerEnum) {
    * @return outerEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnum getOuterEnum() {
@@ -325,7 +325,7 @@ public OuterEnum getOuterEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnum(@javax.annotation.Nullable OuterEnum outerEnum) {
     this.outerEnum = outerEnum;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 312b378814ec..e97860bd7ebe 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -59,7 +59,7 @@ public FileSchemaTestClass _file(@javax.annotation.Nullable ModelFile _file) {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -67,7 +67,7 @@ public ModelFile getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -92,7 +92,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -100,7 +100,7 @@ public List<ModelFile> getFiles() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FormatTest.java
index 19180fae06b6..b3bef0acefa9 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -124,7 +124,7 @@ public FormatTest integer(@javax.annotation.Nullable Integer integer) {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -132,7 +132,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -151,7 +151,7 @@ public FormatTest int32(@javax.annotation.Nullable Integer int32) {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -159,7 +159,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -176,7 +176,7 @@ public FormatTest int64(@javax.annotation.Nullable Long int64) {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -184,7 +184,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -203,7 +203,7 @@ public FormatTest number(@javax.annotation.Nonnull BigDecimal number) {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -211,7 +211,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -230,7 +230,7 @@ public FormatTest _float(@javax.annotation.Nullable Float _float) {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -238,7 +238,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -257,7 +257,7 @@ public FormatTest _double(@javax.annotation.Nullable Double _double) {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -265,7 +265,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -282,7 +282,7 @@ public FormatTest string(@javax.annotation.Nullable String string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -290,7 +290,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -307,7 +307,7 @@ public FormatTest _byte(@javax.annotation.Nonnull byte[] _byte) {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -315,7 +315,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -332,7 +332,7 @@ public FormatTest binary(@javax.annotation.Nullable File binary) {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -340,7 +340,7 @@ public File getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -357,7 +357,7 @@ public FormatTest date(@javax.annotation.Nonnull LocalDate date) {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -365,7 +365,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -382,7 +382,7 @@ public FormatTest dateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -390,7 +390,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -407,7 +407,7 @@ public FormatTest uuid(@javax.annotation.Nullable UUID uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -415,7 +415,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -432,7 +432,7 @@ public FormatTest password(@javax.annotation.Nonnull String password) {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -440,7 +440,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -457,7 +457,7 @@ public FormatTest bigDecimal(@javax.annotation.Nullable BigDecimal bigDecimal) {
    * @return bigDecimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getBigDecimal() {
@@ -465,7 +465,7 @@ public BigDecimal getBigDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBigDecimal(@javax.annotation.Nullable BigDecimal bigDecimal) {
     this.bigDecimal = bigDecimal;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 476a3fefee0c..0b2e7ecb6ccc 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -62,7 +62,7 @@ public HasOnlyReadOnly(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -77,7 +77,7 @@ public String getBar() {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MapTest.java
index 305346b28dee..4c47b26893d1 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MapTest.java
@@ -111,7 +111,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -119,7 +119,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -144,7 +144,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -152,7 +152,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -177,7 +177,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -185,7 +185,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -210,7 +210,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -218,7 +218,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 749a6e1f85e7..fafac9908cdb 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -66,7 +66,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@javax.annotation.Nullab
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -74,7 +74,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -91,7 +91,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@javax.annotation.Nu
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -99,7 +99,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -124,7 +124,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -132,7 +132,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Model200Response.java
index d467daad3541..2b673f325409 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -57,7 +57,7 @@ public Model200Response name(@javax.annotation.Nullable Integer name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -65,7 +65,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -82,7 +82,7 @@ public Model200Response propertyClass(@javax.annotation.Nullable String property
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -90,7 +90,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 351c62bac8b9..d449a5952227 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -62,7 +62,7 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -70,7 +70,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -87,7 +87,7 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -95,7 +95,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -112,7 +112,7 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -120,7 +120,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelFile.java
index 816fc4fa0064..8d5f51659eb6 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -52,7 +52,7 @@ public ModelFile sourceURI(@javax.annotation.Nullable String sourceURI) {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -60,7 +60,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelList.java
index 65a566ce5e83..8c2fbabc55ff 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelList.java
@@ -52,7 +52,7 @@ public ModelList _123list(@javax.annotation.Nullable String _123list) {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -60,7 +60,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelReturn.java
index 79a6baa30dee..7ae7ccb5a135 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -52,7 +52,7 @@ public ModelReturn _return(@javax.annotation.Nullable Integer _return) {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -60,7 +60,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Name.java
index a8d62707df8b..98faf0055bb8 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Name.java
@@ -76,7 +76,7 @@ public Name name(@javax.annotation.Nonnull Integer name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -84,7 +84,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -96,7 +96,7 @@ public void setName(@javax.annotation.Nonnull Integer name) {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -116,7 +116,7 @@ public Name property(@javax.annotation.Nullable String property) {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -124,7 +124,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -136,7 +136,7 @@ public void setProperty(@javax.annotation.Nullable String property) {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NumberOnly.java
index 5c82b27291fa..1b802b71cae7 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -52,7 +52,7 @@ public NumberOnly justNumber(@javax.annotation.Nullable BigDecimal justNumber) {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -60,7 +60,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Order.java
index e6f2d914d986..2ad50354cb03 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Order.java
@@ -114,7 +114,7 @@ public Order id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -122,7 +122,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -139,7 +139,7 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -147,7 +147,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -164,7 +164,7 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -172,7 +172,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -189,7 +189,7 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -197,7 +197,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -214,7 +214,7 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -222,7 +222,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -239,7 +239,7 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -247,7 +247,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/OuterComposite.java
index 3f2e4b03f92e..bbd2fd96b114 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -62,7 +62,7 @@ public OuterComposite myNumber(@javax.annotation.Nullable BigDecimal myNumber) {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -70,7 +70,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -87,7 +87,7 @@ public OuterComposite myString(@javax.annotation.Nullable String myString) {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -95,7 +95,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -112,7 +112,7 @@ public OuterComposite myBoolean(@javax.annotation.Nullable Boolean myBoolean) {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -120,7 +120,7 @@ public Boolean getMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Pet.java
index c1723ce2eb9c..bbada0565220 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,7 +120,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -128,7 +128,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -145,7 +145,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -153,7 +153,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -170,7 +170,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -178,7 +178,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -203,7 +203,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -212,7 +212,7 @@ public Set<String> getPhotoUrls() {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -237,7 +237,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -245,7 +245,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -262,7 +262,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -270,7 +270,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index babde0bf76b7..362a6723e6d0 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -59,7 +59,7 @@ public ReadOnlyFirst(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -79,7 +79,7 @@ public ReadOnlyFirst baz(@javax.annotation.Nullable String baz) {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -87,7 +87,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 95f0e6c94565..358711cab17b 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -52,7 +52,7 @@ public SpecialModelName() {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -60,7 +60,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Tag.java
index 6ae76dc3ab77..9a5bea0d753c 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Tag.java
@@ -56,7 +56,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -64,7 +64,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -81,7 +81,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -89,7 +89,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TypeHolderDefault.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
index 7c79d169424c..ab4fada17762 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
@@ -74,7 +74,7 @@ public TypeHolderDefault stringItem(@javax.annotation.Nonnull String stringItem)
    * @return stringItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -82,7 +82,7 @@ public String getStringItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -99,7 +99,7 @@ public TypeHolderDefault numberItem(@javax.annotation.Nonnull BigDecimal numberI
    * @return numberItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -107,7 +107,7 @@ public BigDecimal getNumberItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -124,7 +124,7 @@ public TypeHolderDefault integerItem(@javax.annotation.Nonnull Integer integerIt
    * @return integerItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -132,7 +132,7 @@ public Integer getIntegerItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -149,7 +149,7 @@ public TypeHolderDefault boolItem(@javax.annotation.Nonnull Boolean boolItem) {
    * @return boolItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean getBoolItem() {
@@ -157,7 +157,7 @@ public Boolean getBoolItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -182,7 +182,7 @@ public TypeHolderDefault addArrayItemItem(Integer arrayItemItem) {
    * @return arrayItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -190,7 +190,7 @@ public List<Integer> getArrayItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TypeHolderExample.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TypeHolderExample.java
index 9d3ae7f8a7f1..e0c6060f3db9 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TypeHolderExample.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TypeHolderExample.java
@@ -79,7 +79,7 @@ public TypeHolderExample stringItem(@javax.annotation.Nonnull String stringItem)
    * @return stringItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -87,7 +87,7 @@ public String getStringItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -104,7 +104,7 @@ public TypeHolderExample numberItem(@javax.annotation.Nonnull BigDecimal numberI
    * @return numberItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -112,7 +112,7 @@ public BigDecimal getNumberItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -129,7 +129,7 @@ public TypeHolderExample floatItem(@javax.annotation.Nonnull Float floatItem) {
    * @return floatItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Float getFloatItem() {
@@ -137,7 +137,7 @@ public Float getFloatItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setFloatItem(@javax.annotation.Nonnull Float floatItem) {
     this.floatItem = floatItem;
@@ -154,7 +154,7 @@ public TypeHolderExample integerItem(@javax.annotation.Nonnull Integer integerIt
    * @return integerItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -162,7 +162,7 @@ public Integer getIntegerItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -179,7 +179,7 @@ public TypeHolderExample boolItem(@javax.annotation.Nonnull Boolean boolItem) {
    * @return boolItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean getBoolItem() {
@@ -187,7 +187,7 @@ public Boolean getBoolItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -212,7 +212,7 @@ public TypeHolderExample addArrayItemItem(Integer arrayItemItem) {
    * @return arrayItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -220,7 +220,7 @@ public List<Integer> getArrayItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/User.java
index 548915ebcb47..dc565ff2ce7c 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/User.java
@@ -86,7 +86,7 @@ public User id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -94,7 +94,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -111,7 +111,7 @@ public User username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -119,7 +119,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -136,7 +136,7 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -144,7 +144,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -161,7 +161,7 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -169,7 +169,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -186,7 +186,7 @@ public User email(@javax.annotation.Nullable String email) {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -194,7 +194,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -211,7 +211,7 @@ public User password(@javax.annotation.Nullable String password) {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -219,7 +219,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -236,7 +236,7 @@ public User phone(@javax.annotation.Nullable String phone) {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -244,7 +244,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -261,7 +261,7 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -269,7 +269,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/XmlItem.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/XmlItem.java
index f006ea5fdb4b..1e0d9e47b00b 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/XmlItem.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/XmlItem.java
@@ -194,7 +194,7 @@ public XmlItem attributeString(@javax.annotation.Nullable String attributeString
    * @return attributeString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAttributeString() {
@@ -202,7 +202,7 @@ public String getAttributeString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeString(@javax.annotation.Nullable String attributeString) {
     this.attributeString = attributeString;
@@ -219,7 +219,7 @@ public XmlItem attributeNumber(@javax.annotation.Nullable BigDecimal attributeNu
    * @return attributeNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getAttributeNumber() {
@@ -227,7 +227,7 @@ public BigDecimal getAttributeNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeNumber(@javax.annotation.Nullable BigDecimal attributeNumber) {
     this.attributeNumber = attributeNumber;
@@ -244,7 +244,7 @@ public XmlItem attributeInteger(@javax.annotation.Nullable Integer attributeInte
    * @return attributeInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getAttributeInteger() {
@@ -252,7 +252,7 @@ public Integer getAttributeInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeInteger(@javax.annotation.Nullable Integer attributeInteger) {
     this.attributeInteger = attributeInteger;
@@ -269,7 +269,7 @@ public XmlItem attributeBoolean(@javax.annotation.Nullable Boolean attributeBool
    * @return attributeBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getAttributeBoolean() {
@@ -277,7 +277,7 @@ public Boolean getAttributeBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeBoolean(@javax.annotation.Nullable Boolean attributeBoolean) {
     this.attributeBoolean = attributeBoolean;
@@ -302,7 +302,7 @@ public XmlItem addWrappedArrayItem(Integer wrappedArrayItem) {
    * @return wrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getWrappedArray() {
@@ -310,7 +310,7 @@ public List<Integer> getWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setWrappedArray(@javax.annotation.Nullable List<Integer> wrappedArray) {
     this.wrappedArray = wrappedArray;
@@ -327,7 +327,7 @@ public XmlItem nameString(@javax.annotation.Nullable String nameString) {
    * @return nameString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNameString() {
@@ -335,7 +335,7 @@ public String getNameString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameString(@javax.annotation.Nullable String nameString) {
     this.nameString = nameString;
@@ -352,7 +352,7 @@ public XmlItem nameNumber(@javax.annotation.Nullable BigDecimal nameNumber) {
    * @return nameNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNameNumber() {
@@ -360,7 +360,7 @@ public BigDecimal getNameNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameNumber(@javax.annotation.Nullable BigDecimal nameNumber) {
     this.nameNumber = nameNumber;
@@ -377,7 +377,7 @@ public XmlItem nameInteger(@javax.annotation.Nullable Integer nameInteger) {
    * @return nameInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNameInteger() {
@@ -385,7 +385,7 @@ public Integer getNameInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameInteger(@javax.annotation.Nullable Integer nameInteger) {
     this.nameInteger = nameInteger;
@@ -402,7 +402,7 @@ public XmlItem nameBoolean(@javax.annotation.Nullable Boolean nameBoolean) {
    * @return nameBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getNameBoolean() {
@@ -410,7 +410,7 @@ public Boolean getNameBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameBoolean(@javax.annotation.Nullable Boolean nameBoolean) {
     this.nameBoolean = nameBoolean;
@@ -435,7 +435,7 @@ public XmlItem addNameArrayItem(Integer nameArrayItem) {
    * @return nameArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameArray() {
@@ -443,7 +443,7 @@ public List<Integer> getNameArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameArray(@javax.annotation.Nullable List<Integer> nameArray) {
     this.nameArray = nameArray;
@@ -468,7 +468,7 @@ public XmlItem addNameWrappedArrayItem(Integer nameWrappedArrayItem) {
    * @return nameWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameWrappedArray() {
@@ -476,7 +476,7 @@ public List<Integer> getNameWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameWrappedArray(@javax.annotation.Nullable List<Integer> nameWrappedArray) {
     this.nameWrappedArray = nameWrappedArray;
@@ -493,7 +493,7 @@ public XmlItem prefixString(@javax.annotation.Nullable String prefixString) {
    * @return prefixString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixString() {
@@ -501,7 +501,7 @@ public String getPrefixString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixString(@javax.annotation.Nullable String prefixString) {
     this.prefixString = prefixString;
@@ -518,7 +518,7 @@ public XmlItem prefixNumber(@javax.annotation.Nullable BigDecimal prefixNumber)
    * @return prefixNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNumber() {
@@ -526,7 +526,7 @@ public BigDecimal getPrefixNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNumber(@javax.annotation.Nullable BigDecimal prefixNumber) {
     this.prefixNumber = prefixNumber;
@@ -543,7 +543,7 @@ public XmlItem prefixInteger(@javax.annotation.Nullable Integer prefixInteger) {
    * @return prefixInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixInteger() {
@@ -551,7 +551,7 @@ public Integer getPrefixInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixInteger(@javax.annotation.Nullable Integer prefixInteger) {
     this.prefixInteger = prefixInteger;
@@ -568,7 +568,7 @@ public XmlItem prefixBoolean(@javax.annotation.Nullable Boolean prefixBoolean) {
    * @return prefixBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getPrefixBoolean() {
@@ -576,7 +576,7 @@ public Boolean getPrefixBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixBoolean(@javax.annotation.Nullable Boolean prefixBoolean) {
     this.prefixBoolean = prefixBoolean;
@@ -601,7 +601,7 @@ public XmlItem addPrefixArrayItem(Integer prefixArrayItem) {
    * @return prefixArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixArray() {
@@ -609,7 +609,7 @@ public List<Integer> getPrefixArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixArray(@javax.annotation.Nullable List<Integer> prefixArray) {
     this.prefixArray = prefixArray;
@@ -634,7 +634,7 @@ public XmlItem addPrefixWrappedArrayItem(Integer prefixWrappedArrayItem) {
    * @return prefixWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixWrappedArray() {
@@ -642,7 +642,7 @@ public List<Integer> getPrefixWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixWrappedArray(@javax.annotation.Nullable List<Integer> prefixWrappedArray) {
     this.prefixWrappedArray = prefixWrappedArray;
@@ -659,7 +659,7 @@ public XmlItem namespaceString(@javax.annotation.Nullable String namespaceString
    * @return namespaceString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNamespaceString() {
@@ -667,7 +667,7 @@ public String getNamespaceString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceString(@javax.annotation.Nullable String namespaceString) {
     this.namespaceString = namespaceString;
@@ -684,7 +684,7 @@ public XmlItem namespaceNumber(@javax.annotation.Nullable BigDecimal namespaceNu
    * @return namespaceNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNamespaceNumber() {
@@ -692,7 +692,7 @@ public BigDecimal getNamespaceNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceNumber(@javax.annotation.Nullable BigDecimal namespaceNumber) {
     this.namespaceNumber = namespaceNumber;
@@ -709,7 +709,7 @@ public XmlItem namespaceInteger(@javax.annotation.Nullable Integer namespaceInte
    * @return namespaceInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNamespaceInteger() {
@@ -717,7 +717,7 @@ public Integer getNamespaceInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceInteger(@javax.annotation.Nullable Integer namespaceInteger) {
     this.namespaceInteger = namespaceInteger;
@@ -734,7 +734,7 @@ public XmlItem namespaceBoolean(@javax.annotation.Nullable Boolean namespaceBool
    * @return namespaceBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getNamespaceBoolean() {
@@ -742,7 +742,7 @@ public Boolean getNamespaceBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceBoolean(@javax.annotation.Nullable Boolean namespaceBoolean) {
     this.namespaceBoolean = namespaceBoolean;
@@ -767,7 +767,7 @@ public XmlItem addNamespaceArrayItem(Integer namespaceArrayItem) {
    * @return namespaceArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceArray() {
@@ -775,7 +775,7 @@ public List<Integer> getNamespaceArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceArray(@javax.annotation.Nullable List<Integer> namespaceArray) {
     this.namespaceArray = namespaceArray;
@@ -800,7 +800,7 @@ public XmlItem addNamespaceWrappedArrayItem(Integer namespaceWrappedArrayItem) {
    * @return namespaceWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceWrappedArray() {
@@ -808,7 +808,7 @@ public List<Integer> getNamespaceWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceWrappedArray(@javax.annotation.Nullable List<Integer> namespaceWrappedArray) {
     this.namespaceWrappedArray = namespaceWrappedArray;
@@ -825,7 +825,7 @@ public XmlItem prefixNsString(@javax.annotation.Nullable String prefixNsString)
    * @return prefixNsString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixNsString() {
@@ -833,7 +833,7 @@ public String getPrefixNsString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsString(@javax.annotation.Nullable String prefixNsString) {
     this.prefixNsString = prefixNsString;
@@ -850,7 +850,7 @@ public XmlItem prefixNsNumber(@javax.annotation.Nullable BigDecimal prefixNsNumb
    * @return prefixNsNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNsNumber() {
@@ -858,7 +858,7 @@ public BigDecimal getPrefixNsNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsNumber(@javax.annotation.Nullable BigDecimal prefixNsNumber) {
     this.prefixNsNumber = prefixNsNumber;
@@ -875,7 +875,7 @@ public XmlItem prefixNsInteger(@javax.annotation.Nullable Integer prefixNsIntege
    * @return prefixNsInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixNsInteger() {
@@ -883,7 +883,7 @@ public Integer getPrefixNsInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsInteger(@javax.annotation.Nullable Integer prefixNsInteger) {
     this.prefixNsInteger = prefixNsInteger;
@@ -900,7 +900,7 @@ public XmlItem prefixNsBoolean(@javax.annotation.Nullable Boolean prefixNsBoolea
    * @return prefixNsBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getPrefixNsBoolean() {
@@ -908,7 +908,7 @@ public Boolean getPrefixNsBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsBoolean(@javax.annotation.Nullable Boolean prefixNsBoolean) {
     this.prefixNsBoolean = prefixNsBoolean;
@@ -933,7 +933,7 @@ public XmlItem addPrefixNsArrayItem(Integer prefixNsArrayItem) {
    * @return prefixNsArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsArray() {
@@ -941,7 +941,7 @@ public List<Integer> getPrefixNsArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsArray(@javax.annotation.Nullable List<Integer> prefixNsArray) {
     this.prefixNsArray = prefixNsArray;
@@ -966,7 +966,7 @@ public XmlItem addPrefixNsWrappedArrayItem(Integer prefixNsWrappedArrayItem) {
    * @return prefixNsWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsWrappedArray() {
@@ -974,7 +974,7 @@ public List<Integer> getPrefixNsWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsWrappedArray(@javax.annotation.Nullable List<Integer> prefixNsWrappedArray) {
     this.prefixNsWrappedArray = prefixNsWrappedArray;
diff --git a/samples/client/petstore/java/jersey3-oneOf/src/main/java/org/openapitools/client/model/SchemaA.java b/samples/client/petstore/java/jersey3-oneOf/src/main/java/org/openapitools/client/model/SchemaA.java
index 4fcfc27ea8b6..73a420174772 100644
--- a/samples/client/petstore/java/jersey3-oneOf/src/main/java/org/openapitools/client/model/SchemaA.java
+++ b/samples/client/petstore/java/jersey3-oneOf/src/main/java/org/openapitools/client/model/SchemaA.java
@@ -52,7 +52,7 @@ public SchemaA propA(@jakarta.annotation.Nullable String propA) {
    * @return propA
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROP_A)
+  @JsonProperty(value = JSON_PROPERTY_PROP_A, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropA() {
@@ -60,7 +60,7 @@ public String getPropA() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROP_A)
+  @JsonProperty(value = JSON_PROPERTY_PROP_A, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropA(@jakarta.annotation.Nullable String propA) {
     this.propA = propA;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 860febf9011f..4e3e6086077d 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -104,7 +104,7 @@ public AdditionalPropertiesClass putMapPropertyItem(String key, String mapProper
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -112,7 +112,7 @@ public Map<String, String> getMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@jakarta.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -139,7 +139,7 @@ public AdditionalPropertiesClass putMapOfMapPropertyItem(String key, Map<String,
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -147,7 +147,7 @@ public Map<String, Map<String, String>> getMapOfMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
@@ -171,7 +171,7 @@ public Object getAnytype1() {
         return anytype1.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnytype1_JsonNullable() {
@@ -199,7 +199,7 @@ public AdditionalPropertiesClass mapWithUndeclaredPropertiesAnytype1(@jakarta.an
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getMapWithUndeclaredPropertiesAnytype1() {
@@ -207,7 +207,7 @@ public Object getMapWithUndeclaredPropertiesAnytype1() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype1(@jakarta.annotation.Nullable Object mapWithUndeclaredPropertiesAnytype1) {
     this.mapWithUndeclaredPropertiesAnytype1 = mapWithUndeclaredPropertiesAnytype1;
@@ -225,7 +225,7 @@ public AdditionalPropertiesClass mapWithUndeclaredPropertiesAnytype2(@jakarta.an
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getMapWithUndeclaredPropertiesAnytype2() {
@@ -233,7 +233,7 @@ public Object getMapWithUndeclaredPropertiesAnytype2() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype2(@jakarta.annotation.Nullable Object mapWithUndeclaredPropertiesAnytype2) {
     this.mapWithUndeclaredPropertiesAnytype2 = mapWithUndeclaredPropertiesAnytype2;
@@ -259,7 +259,7 @@ public AdditionalPropertiesClass putMapWithUndeclaredPropertiesAnytype3Item(Stri
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getMapWithUndeclaredPropertiesAnytype3() {
@@ -267,7 +267,7 @@ public Map<String, Object> getMapWithUndeclaredPropertiesAnytype3() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype3(@jakarta.annotation.Nullable Map<String, Object> mapWithUndeclaredPropertiesAnytype3) {
     this.mapWithUndeclaredPropertiesAnytype3 = mapWithUndeclaredPropertiesAnytype3;
@@ -285,7 +285,7 @@ public AdditionalPropertiesClass emptyMap(@jakarta.annotation.Nullable Object em
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_EMPTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_EMPTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getEmptyMap() {
@@ -293,7 +293,7 @@ public Object getEmptyMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMPTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_EMPTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmptyMap(@jakarta.annotation.Nullable Object emptyMap) {
     this.emptyMap = emptyMap;
@@ -319,7 +319,7 @@ public AdditionalPropertiesClass putMapWithUndeclaredPropertiesStringItem(String
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapWithUndeclaredPropertiesString() {
@@ -327,7 +327,7 @@ public Map<String, String> getMapWithUndeclaredPropertiesString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesString(@jakarta.annotation.Nullable Map<String, String> mapWithUndeclaredPropertiesString) {
     this.mapWithUndeclaredPropertiesString = mapWithUndeclaredPropertiesString;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Animal.java
index 4c1ab21fbc5b..4de375281291 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Animal.java
@@ -75,7 +75,7 @@ public Animal className(@jakarta.annotation.Nonnull String className) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -83,7 +83,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
@@ -101,7 +101,7 @@ public Animal color(@jakarta.annotation.Nullable String color) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -109,7 +109,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@jakarta.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Apple.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Apple.java
index 002d6b185137..b653024a08cd 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Apple.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Apple.java
@@ -62,7 +62,7 @@ public Apple cultivar(@jakarta.annotation.Nullable String cultivar) {
    */
   @jakarta.annotation.Nullable
  @Pattern(regexp="^[a-zA-Z\\s]*$")
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCultivar() {
@@ -70,7 +70,7 @@ public String getCultivar() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCultivar(@jakarta.annotation.Nullable String cultivar) {
     this.cultivar = cultivar;
@@ -88,7 +88,7 @@ public Apple origin(@jakarta.annotation.Nullable String origin) {
    */
   @jakarta.annotation.Nullable
  @Pattern(regexp="/^[A-Z\\s]*$/i")
-  @JsonProperty(JSON_PROPERTY_ORIGIN)
+  @JsonProperty(value = JSON_PROPERTY_ORIGIN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOrigin() {
@@ -96,7 +96,7 @@ public String getOrigin() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ORIGIN)
+  @JsonProperty(value = JSON_PROPERTY_ORIGIN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOrigin(@jakarta.annotation.Nullable String origin) {
     this.origin = origin;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/AppleReq.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/AppleReq.java
index ba784fddff1a..03919dc3f992 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/AppleReq.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/AppleReq.java
@@ -63,7 +63,7 @@ public AppleReq cultivar(@jakarta.annotation.Nonnull String cultivar) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getCultivar() {
@@ -71,7 +71,7 @@ public String getCultivar() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setCultivar(@jakarta.annotation.Nonnull String cultivar) {
     this.cultivar = cultivar;
@@ -89,7 +89,7 @@ public AppleReq mealy(@jakarta.annotation.Nullable Boolean mealy) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MEALY)
+  @JsonProperty(value = JSON_PROPERTY_MEALY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMealy() {
@@ -97,7 +97,7 @@ public Boolean getMealy() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MEALY)
+  @JsonProperty(value = JSON_PROPERTY_MEALY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMealy(@jakarta.annotation.Nullable Boolean mealy) {
     this.mealy = mealy;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index d4bddcb89bd5..29b80e171e29 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -68,7 +68,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -76,7 +76,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@jakarta.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index a841087d0517..c0c7c19a1efe 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -68,7 +68,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -76,7 +76,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@jakarta.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayTest.java
index bd1636145fb9..1c75793ffc37 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -77,7 +77,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -85,7 +85,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@jakarta.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -112,7 +112,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -120,7 +120,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@jakarta.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -147,7 +147,7 @@ public ArrayTest addArrayArrayOfModelItem(List<@Valid ReadOnlyFirst> arrayArrayO
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<@Valid ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -155,7 +155,7 @@ public ArrayTest addArrayArrayOfModelItem(List<@Valid ReadOnlyFirst> arrayArrayO
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@jakarta.annotation.Nullable List<List<@Valid ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Banana.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Banana.java
index 1d4d4ed41f08..376971ac4ff5 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Banana.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Banana.java
@@ -59,7 +59,7 @@ public Banana lengthCm(@jakarta.annotation.Nullable BigDecimal lengthCm) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getLengthCm() {
@@ -67,7 +67,7 @@ public BigDecimal getLengthCm() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLengthCm(@jakarta.annotation.Nullable BigDecimal lengthCm) {
     this.lengthCm = lengthCm;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/BananaReq.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/BananaReq.java
index 8140faafb623..9182cf1604af 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/BananaReq.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/BananaReq.java
@@ -65,7 +65,7 @@ public BananaReq lengthCm(@jakarta.annotation.Nonnull BigDecimal lengthCm) {
   @NotNull
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getLengthCm() {
@@ -73,7 +73,7 @@ public BigDecimal getLengthCm() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setLengthCm(@jakarta.annotation.Nonnull BigDecimal lengthCm) {
     this.lengthCm = lengthCm;
@@ -91,7 +91,7 @@ public BananaReq sweet(@jakarta.annotation.Nullable Boolean sweet) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SWEET)
+  @JsonProperty(value = JSON_PROPERTY_SWEET, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getSweet() {
@@ -99,7 +99,7 @@ public Boolean getSweet() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SWEET)
+  @JsonProperty(value = JSON_PROPERTY_SWEET, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSweet(@jakarta.annotation.Nullable Boolean sweet) {
     this.sweet = sweet;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/BasquePig.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/BasquePig.java
index 8d3949ac7884..c4e07c25fcf9 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/BasquePig.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/BasquePig.java
@@ -57,7 +57,7 @@ public BasquePig className(@jakarta.annotation.Nonnull String className) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -65,7 +65,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Capitalization.java
index 68919b60111a..a05cc53bb9d7 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -81,7 +81,7 @@ public Capitalization smallCamel(@jakarta.annotation.Nullable String smallCamel)
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -89,7 +89,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@jakarta.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -107,7 +107,7 @@ public Capitalization capitalCamel(@jakarta.annotation.Nullable String capitalCa
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -115,7 +115,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@jakarta.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -133,7 +133,7 @@ public Capitalization smallSnake(@jakarta.annotation.Nullable String smallSnake)
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -141,7 +141,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@jakarta.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -159,7 +159,7 @@ public Capitalization capitalSnake(@jakarta.annotation.Nullable String capitalSn
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -167,7 +167,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@jakarta.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -185,7 +185,7 @@ public Capitalization scAETHFlowPoints(@jakarta.annotation.Nullable String scAET
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -193,7 +193,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@jakarta.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -211,7 +211,7 @@ public Capitalization ATT_NAME(@jakarta.annotation.Nullable String ATT_NAME) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -219,7 +219,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@jakarta.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Cat.java
index 581a41293519..a5328a2d4419 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Cat.java
@@ -71,7 +71,7 @@ public Cat declawed(@jakarta.annotation.Nullable Boolean declawed) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -79,7 +79,7 @@ public Boolean getDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@jakarta.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Category.java
index cdb4f63e835d..9bb072554dac 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Category.java
@@ -61,7 +61,7 @@ public Category id(@jakarta.annotation.Nullable Long id) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -69,7 +69,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -88,7 +88,7 @@ public Category name(@jakarta.annotation.Nonnull String name) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -96,7 +96,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ChildCat.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ChildCat.java
index 3278dd840b48..20dd77d4758c 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ChildCat.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ChildCat.java
@@ -77,7 +77,7 @@ public ChildCat name(@jakarta.annotation.Nullable String name) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -85,7 +85,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
@@ -111,7 +111,7 @@ public ChildCat petType(@jakarta.annotation.Nullable String petType) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPetType() {
@@ -119,7 +119,7 @@ public String getPetType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetType(@jakarta.annotation.Nullable String petType) {
     if (!PET_TYPE_VALUES.contains(petType)) {
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ClassModel.java
index 58b7a713d523..e103cc8cb418 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -56,7 +56,7 @@ public ClassModel propertyClass(@jakarta.annotation.Nullable String propertyClas
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -64,7 +64,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Client.java
index c2b37145f054..a1a258a05dc5 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Client.java
@@ -56,7 +56,7 @@ public Client client(@jakarta.annotation.Nullable String client) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -64,7 +64,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@jakarta.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
index dc93c0741d40..f7540f940eab 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
@@ -66,7 +66,7 @@ public ComplexQuadrilateral shapeType(@jakarta.annotation.Nonnull String shapeTy
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -74,7 +74,7 @@ public String getShapeType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@jakarta.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -93,7 +93,7 @@ public ComplexQuadrilateral quadrilateralType(@jakarta.annotation.Nonnull String
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getQuadrilateralType() {
@@ -101,7 +101,7 @@ public String getQuadrilateralType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@jakarta.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/DanishPig.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/DanishPig.java
index 25a796af9521..72474590ea79 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/DanishPig.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/DanishPig.java
@@ -57,7 +57,7 @@ public DanishPig className(@jakarta.annotation.Nonnull String className) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -65,7 +65,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 03f8e396340e..e18394b64db7 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -58,7 +58,7 @@ public DeprecatedObject name(@jakarta.annotation.Nullable String name) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -66,7 +66,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Dog.java
index a46242557ce9..5e60372efc40 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Dog.java
@@ -70,7 +70,7 @@ public Dog breed(@jakarta.annotation.Nullable String breed) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -78,7 +78,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@jakarta.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Drawing.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Drawing.java
index 9e60cda883e4..08c12b08df1c 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Drawing.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Drawing.java
@@ -84,7 +84,7 @@ public Drawing mainShape(@jakarta.annotation.Nullable Shape mainShape) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAIN_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_MAIN_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Shape getMainShape() {
@@ -92,7 +92,7 @@ public Shape getMainShape() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAIN_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_MAIN_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMainShape(@jakarta.annotation.Nullable Shape mainShape) {
     this.mainShape = mainShape;
@@ -117,7 +117,7 @@ public ShapeOrNull getShapeOrNull() {
         return shapeOrNull.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_OR_NULL)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_OR_NULL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<ShapeOrNull> getShapeOrNull_JsonNullable() {
@@ -152,7 +152,7 @@ public NullableShape getNullableShape() {
         return nullableShape.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<NullableShape> getNullableShape_JsonNullable() {
@@ -189,7 +189,7 @@ public Drawing addShapesItem(Shape shapesItem) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_SHAPES)
+  @JsonProperty(value = JSON_PROPERTY_SHAPES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Shape> getShapes() {
@@ -197,7 +197,7 @@ public List<Shape> getShapes() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPES)
+  @JsonProperty(value = JSON_PROPERTY_SHAPES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShapes(@jakarta.annotation.Nullable List<Shape> shapes) {
     this.shapes = shapes;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EnumArrays.java
index 6fe5cb0b5aa6..d99e8d907b6b 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -133,7 +133,7 @@ public EnumArrays justSymbol(@jakarta.annotation.Nullable JustSymbolEnum justSym
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -141,7 +141,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@jakarta.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -167,7 +167,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -175,7 +175,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@jakarta.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EnumTest.java
index d819b882ae22..ea2e69136fad 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -283,7 +283,7 @@ public EnumTest enumString(@jakarta.annotation.Nullable EnumStringEnum enumStrin
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -291,7 +291,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@jakarta.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -310,7 +310,7 @@ public EnumTest enumStringRequired(@jakarta.annotation.Nonnull EnumStringRequire
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -318,7 +318,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@jakarta.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -336,7 +336,7 @@ public EnumTest enumInteger(@jakarta.annotation.Nullable EnumIntegerEnum enumInt
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -344,7 +344,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@jakarta.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -362,7 +362,7 @@ public EnumTest enumIntegerOnly(@jakarta.annotation.Nullable EnumIntegerOnlyEnum
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER_ONLY)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER_ONLY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerOnlyEnum getEnumIntegerOnly() {
@@ -370,7 +370,7 @@ public EnumIntegerOnlyEnum getEnumIntegerOnly() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER_ONLY)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER_ONLY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumIntegerOnly(@jakarta.annotation.Nullable EnumIntegerOnlyEnum enumIntegerOnly) {
     this.enumIntegerOnly = enumIntegerOnly;
@@ -388,7 +388,7 @@ public EnumTest enumNumber(@jakarta.annotation.Nullable EnumNumberEnum enumNumbe
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -396,7 +396,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@jakarta.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -421,7 +421,7 @@ public OuterEnum getOuterEnum() {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -450,7 +450,7 @@ public EnumTest outerEnumInteger(@jakarta.annotation.Nullable OuterEnumInteger o
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -458,7 +458,7 @@ public OuterEnumInteger getOuterEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@jakarta.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -477,7 +477,7 @@ public EnumTest outerEnumDefaultValue(@jakarta.annotation.Nullable OuterEnumDefa
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -485,7 +485,7 @@ public OuterEnumDefaultValue getOuterEnumDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@jakarta.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -504,7 +504,7 @@ public EnumTest outerEnumIntegerDefaultValue(@jakarta.annotation.Nullable OuterE
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -512,7 +512,7 @@ public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@jakarta.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EquilateralTriangle.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
index 5995f32aafe3..de12900bef19 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
@@ -66,7 +66,7 @@ public EquilateralTriangle shapeType(@jakarta.annotation.Nonnull String shapeTyp
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -74,7 +74,7 @@ public String getShapeType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@jakarta.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -93,7 +93,7 @@ public EquilateralTriangle triangleType(@jakarta.annotation.Nonnull String trian
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getTriangleType() {
@@ -101,7 +101,7 @@ public String getTriangleType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@jakarta.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 566506a9719d..94c29ede4414 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -65,7 +65,7 @@ public FileSchemaTestClass _file(@jakarta.annotation.Nullable ModelFile _file) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -73,7 +73,7 @@ public ModelFile getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@jakarta.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -100,7 +100,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<@Valid ModelFile> getFiles() {
@@ -108,7 +108,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@jakarta.annotation.Nullable List<@Valid ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Foo.java
index 6366dcd2386c..8bbe15b97ff1 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Foo.java
@@ -56,7 +56,7 @@ public Foo bar(@jakarta.annotation.Nullable String bar) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -64,7 +64,7 @@ public String getBar() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@jakarta.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 00539b9f015b..e96ccee132e7 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -59,7 +59,7 @@ public FooGetDefaultResponse string(@jakarta.annotation.Nullable Foo string) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -67,7 +67,7 @@ public Foo getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FormatTest.java
index 8486b300fd58..9bc07e80c2b7 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -139,7 +139,7 @@ public FormatTest integer(@jakarta.annotation.Nullable Integer integer) {
    */
   @jakarta.annotation.Nullable
  @Min(10) @Max(100)
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -147,7 +147,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@jakarta.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -167,7 +167,7 @@ public FormatTest int32(@jakarta.annotation.Nullable Integer int32) {
    */
   @jakarta.annotation.Nullable
  @Min(20) @Max(200)
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -175,7 +175,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@jakarta.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -193,7 +193,7 @@ public FormatTest int64(@jakarta.annotation.Nullable Long int64) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -201,7 +201,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@jakarta.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -223,7 +223,7 @@ public FormatTest number(@jakarta.annotation.Nonnull BigDecimal number) {
   @NotNull
   @Valid
  @DecimalMin("32.1") @DecimalMax("543.2")
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -231,7 +231,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@jakarta.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -251,7 +251,7 @@ public FormatTest _float(@jakarta.annotation.Nullable Float _float) {
    */
   @jakarta.annotation.Nullable
  @DecimalMin("54.3") @DecimalMax("987.6")
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -259,7 +259,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@jakarta.annotation.Nullable Float _float) {
     this._float = _float;
@@ -279,7 +279,7 @@ public FormatTest _double(@jakarta.annotation.Nullable Double _double) {
    */
   @jakarta.annotation.Nullable
  @DecimalMin("67.8") @DecimalMax("123.4")
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -287,7 +287,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@jakarta.annotation.Nullable Double _double) {
     this._double = _double;
@@ -306,7 +306,7 @@ public FormatTest decimal(@jakarta.annotation.Nullable BigDecimal decimal) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -314,7 +314,7 @@ public BigDecimal getDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@jakarta.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -332,7 +332,7 @@ public FormatTest string(@jakarta.annotation.Nullable String string) {
    */
   @jakarta.annotation.Nullable
  @Pattern(regexp="/[a-z]/i")
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -340,7 +340,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable String string) {
     this.string = string;
@@ -359,7 +359,7 @@ public FormatTest _byte(@jakarta.annotation.Nonnull byte[] _byte) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -367,7 +367,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@jakarta.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -386,7 +386,7 @@ public FormatTest binary(@jakarta.annotation.Nullable File binary) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -394,7 +394,7 @@ public File getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@jakarta.annotation.Nullable File binary) {
     this.binary = binary;
@@ -414,7 +414,7 @@ public FormatTest date(@jakarta.annotation.Nonnull LocalDate date) {
   @NotNull
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -422,7 +422,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@jakarta.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -441,7 +441,7 @@ public FormatTest dateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime)
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -449,7 +449,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -468,7 +468,7 @@ public FormatTest uuid(@jakarta.annotation.Nullable UUID uuid) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -476,7 +476,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -495,7 +495,7 @@ public FormatTest password(@jakarta.annotation.Nonnull String password) {
   @jakarta.annotation.Nonnull
   @NotNull
  @Size(min=10,max=64)
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -503,7 +503,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@jakarta.annotation.Nonnull String password) {
     this.password = password;
@@ -521,7 +521,7 @@ public FormatTest patternWithDigits(@jakarta.annotation.Nullable String patternW
    */
   @jakarta.annotation.Nullable
  @Pattern(regexp="^\\d{10}$")
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -529,7 +529,7 @@ public String getPatternWithDigits() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@jakarta.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -547,7 +547,7 @@ public FormatTest patternWithDigitsAndDelimiter(@jakarta.annotation.Nullable Str
    */
   @jakarta.annotation.Nullable
  @Pattern(regexp="/^image_\\d{1,3}$/i")
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -555,7 +555,7 @@ public String getPatternWithDigitsAndDelimiter() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@jakarta.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/GrandparentAnimal.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
index 0fd27fdff36d..be839aa49ef7 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
@@ -70,7 +70,7 @@ public GrandparentAnimal petType(@jakarta.annotation.Nonnull String petType) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPetType() {
@@ -78,7 +78,7 @@ public String getPetType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPetType(@jakarta.annotation.Nonnull String petType) {
     this.petType = petType;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index a25846f605c9..3f89d558fb3a 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -67,7 +67,7 @@ public HasOnlyReadOnly(
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -83,7 +83,7 @@ public String getBar() {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 32616aa0e344..b5f142fceb95 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -65,7 +65,7 @@ public String getNullableMessage() {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
index 3d2b46eecdaa..a2049a2df117 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
@@ -62,7 +62,7 @@ public IsoscelesTriangle shapeType(@jakarta.annotation.Nonnull String shapeType)
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -70,7 +70,7 @@ public String getShapeType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@jakarta.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -89,7 +89,7 @@ public IsoscelesTriangle triangleType(@jakarta.annotation.Nonnull String triangl
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getTriangleType() {
@@ -97,7 +97,7 @@ public String getTriangleType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@jakarta.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/MapTest.java
index 4e347352b5cd..528e73283f93 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/MapTest.java
@@ -117,7 +117,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -125,7 +125,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -151,7 +151,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -159,7 +159,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@jakarta.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -185,7 +185,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -193,7 +193,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@jakarta.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -219,7 +219,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -227,7 +227,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@jakarta.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 7dbcff746482..72941cfac44e 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -72,7 +72,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@jakarta.annotation.Null
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -80,7 +80,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -99,7 +99,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@jakarta.annotation.
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -107,7 +107,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -134,7 +134,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -142,7 +142,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@jakarta.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Model200Response.java
index 79d2323b7269..917d7a97e23c 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -62,7 +62,7 @@ public Model200Response name(@jakarta.annotation.Nullable Integer name) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -70,7 +70,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable Integer name) {
     this.name = name;
@@ -88,7 +88,7 @@ public Model200Response propertyClass(@jakarta.annotation.Nullable String proper
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -96,7 +96,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index bebd21e7d472..4306305329d0 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -67,7 +67,7 @@ public ModelApiResponse code(@jakarta.annotation.Nullable Integer code) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -75,7 +75,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@jakarta.annotation.Nullable Integer code) {
     this.code = code;
@@ -93,7 +93,7 @@ public ModelApiResponse type(@jakarta.annotation.Nullable String type) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -101,7 +101,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable String type) {
     this.type = type;
@@ -119,7 +119,7 @@ public ModelApiResponse message(@jakarta.annotation.Nullable String message) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -127,7 +127,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@jakarta.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelFile.java
index 8ad5ed892ef3..c0785c427815 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -57,7 +57,7 @@ public ModelFile sourceURI(@jakarta.annotation.Nullable String sourceURI) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -65,7 +65,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@jakarta.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelList.java
index 4ab27804312d..1da5a329e447 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelList.java
@@ -57,7 +57,7 @@ public ModelList _123list(@jakarta.annotation.Nullable String _123list) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -65,7 +65,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@jakarta.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelReturn.java
index 557ea26fb105..7a5acc539ee6 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -57,7 +57,7 @@ public ModelReturn _return(@jakarta.annotation.Nullable Integer _return) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -65,7 +65,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@jakarta.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Name.java
index 7a793343432d..777efef14fa7 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Name.java
@@ -82,7 +82,7 @@ public Name name(@jakarta.annotation.Nonnull Integer name) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -90,7 +90,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull Integer name) {
     this.name = name;
@@ -103,7 +103,7 @@ public void setName(@jakarta.annotation.Nonnull Integer name) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -124,7 +124,7 @@ public Name property(@jakarta.annotation.Nullable String property) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -132,7 +132,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@jakarta.annotation.Nullable String property) {
     this.property = property;
@@ -145,7 +145,7 @@ public void setProperty(@jakarta.annotation.Nullable String property) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/NullableClass.java
index ee9999b9b336..bf86cb646ce7 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -122,7 +122,7 @@ public Integer getIntegerProp() {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -157,7 +157,7 @@ public BigDecimal getNumberProp() {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -191,7 +191,7 @@ public Boolean getBooleanProp() {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -225,7 +225,7 @@ public String getStringProp() {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -260,7 +260,7 @@ public LocalDate getDateProp() {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -295,7 +295,7 @@ public OffsetDateTime getDatetimeProp() {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -341,7 +341,7 @@ public List<Object> getArrayNullableProp() {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -387,7 +387,7 @@ public List<Object> getArrayAndItemsNullableProp() {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -423,7 +423,7 @@ public NullableClass addArrayItemsNullableItem(Object arrayItemsNullableItem) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -431,7 +431,7 @@ public List<Object> getArrayItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@jakarta.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -467,7 +467,7 @@ public Map<String, Object> getObjectNullableProp() {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -513,7 +513,7 @@ public Map<String, Object> getObjectAndItemsNullableProp() {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -549,7 +549,7 @@ public NullableClass putObjectItemsNullableItem(String key, Object objectItemsNu
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -557,7 +557,7 @@ public Map<String, Object> getObjectItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@jakarta.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/NumberOnly.java
index f15a94c9ad7c..55e0470d593d 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -58,7 +58,7 @@ public NumberOnly justNumber(@jakarta.annotation.Nullable BigDecimal justNumber)
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -66,7 +66,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@jakarta.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 98ae893510f1..44423a1fbc95 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -78,7 +78,7 @@ public ObjectWithDeprecatedFields uuid(@jakarta.annotation.Nullable String uuid)
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -86,7 +86,7 @@ public String getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -108,7 +108,7 @@ public ObjectWithDeprecatedFields id(@jakarta.annotation.Nullable BigDecimal id)
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -117,7 +117,7 @@ public BigDecimal getId() {
 
 
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -139,7 +139,7 @@ public ObjectWithDeprecatedFields deprecatedRef(@jakarta.annotation.Nullable Dep
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -148,7 +148,7 @@ public DeprecatedObject getDeprecatedRef() {
 
 
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@jakarta.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -177,7 +177,7 @@ public ObjectWithDeprecatedFields addBarsItem(String barsItem) {
   @Deprecated
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -186,7 +186,7 @@ public List<String> getBars() {
 
 
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@jakarta.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Order.java
index e4f43fff43af..1b4dc5c0c693 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Order.java
@@ -119,7 +119,7 @@ public Order id(@jakarta.annotation.Nullable Long id) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -127,7 +127,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -145,7 +145,7 @@ public Order petId(@jakarta.annotation.Nullable Long petId) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -153,7 +153,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@jakarta.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -171,7 +171,7 @@ public Order quantity(@jakarta.annotation.Nullable Integer quantity) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -179,7 +179,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@jakarta.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -198,7 +198,7 @@ public Order shipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -206,7 +206,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -224,7 +224,7 @@ public Order status(@jakarta.annotation.Nullable StatusEnum status) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -232,7 +232,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -250,7 +250,7 @@ public Order complete(@jakarta.annotation.Nullable Boolean complete) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -258,7 +258,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@jakarta.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/OuterComposite.java
index ea89147f7e87..7b406135d114 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -68,7 +68,7 @@ public OuterComposite myNumber(@jakarta.annotation.Nullable BigDecimal myNumber)
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -76,7 +76,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@jakarta.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -94,7 +94,7 @@ public OuterComposite myString(@jakarta.annotation.Nullable String myString) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -102,7 +102,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@jakarta.annotation.Nullable String myString) {
     this.myString = myString;
@@ -120,7 +120,7 @@ public OuterComposite myBoolean(@jakarta.annotation.Nullable Boolean myBoolean)
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -128,7 +128,7 @@ public Boolean getMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@jakarta.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Pet.java
index 9ba6e1347b3a..6c9f3d48402d 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Pet.java
@@ -122,7 +122,7 @@ public Pet id(@jakarta.annotation.Nullable Long id) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -130,7 +130,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -149,7 +149,7 @@ public Pet category(@jakarta.annotation.Nullable Category category) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -157,7 +157,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@jakarta.annotation.Nullable Category category) {
     this.category = category;
@@ -176,7 +176,7 @@ public Pet name(@jakarta.annotation.Nonnull String name) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -184,7 +184,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
@@ -211,7 +211,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -219,7 +219,7 @@ public List<String> getPhotoUrls() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@jakarta.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -246,7 +246,7 @@ public Pet addTagsItem(Tag tagsItem) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<@Valid Tag> getTags() {
@@ -254,7 +254,7 @@ public Pet addTagsItem(Tag tagsItem) {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@jakarta.annotation.Nullable List<@Valid Tag> tags) {
     this.tags = tags;
@@ -272,7 +272,7 @@ public Pet status(@jakarta.annotation.Nullable StatusEnum status) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -280,7 +280,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
index 66b64bc88752..518f83cf6404 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
@@ -57,7 +57,7 @@ public QuadrilateralInterface quadrilateralType(@jakarta.annotation.Nonnull Stri
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getQuadrilateralType() {
@@ -65,7 +65,7 @@ public String getQuadrilateralType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@jakarta.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 82ee510ddf31..42cae841b1cb 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -64,7 +64,7 @@ public ReadOnlyFirst(
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -85,7 +85,7 @@ public ReadOnlyFirst baz(@jakarta.annotation.Nullable String baz) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -93,7 +93,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@jakarta.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ScaleneTriangle.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
index 09cf6b767b6e..9b845bd8fef9 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
@@ -66,7 +66,7 @@ public ScaleneTriangle shapeType(@jakarta.annotation.Nonnull String shapeType) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -74,7 +74,7 @@ public String getShapeType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@jakarta.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -93,7 +93,7 @@ public ScaleneTriangle triangleType(@jakarta.annotation.Nonnull String triangleT
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getTriangleType() {
@@ -101,7 +101,7 @@ public String getTriangleType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@jakarta.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ShapeInterface.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ShapeInterface.java
index 76c0bc7d0511..510d0a891b55 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ShapeInterface.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ShapeInterface.java
@@ -57,7 +57,7 @@ public ShapeInterface shapeType(@jakarta.annotation.Nonnull String shapeType) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -65,7 +65,7 @@ public String getShapeType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@jakarta.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
index 049d89d45b9b..59b665520745 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
@@ -66,7 +66,7 @@ public SimpleQuadrilateral shapeType(@jakarta.annotation.Nonnull String shapeTyp
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -74,7 +74,7 @@ public String getShapeType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@jakarta.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -93,7 +93,7 @@ public SimpleQuadrilateral quadrilateralType(@jakarta.annotation.Nonnull String
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getQuadrilateralType() {
@@ -101,7 +101,7 @@ public String getQuadrilateralType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@jakarta.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/SpecialModelName.java
index d8fbd836b85c..af98e5eb4a6e 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -62,7 +62,7 @@ public SpecialModelName() {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -70,7 +70,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@jakarta.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
@@ -88,7 +88,7 @@ public SpecialModelName specialModelName(@jakarta.annotation.Nullable String spe
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SPECIAL_MODEL_NAME)
+  @JsonProperty(value = JSON_PROPERTY_SPECIAL_MODEL_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSpecialModelName() {
@@ -96,7 +96,7 @@ public String getSpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SPECIAL_MODEL_NAME)
+  @JsonProperty(value = JSON_PROPERTY_SPECIAL_MODEL_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSpecialModelName(@jakarta.annotation.Nullable String specialModelName) {
     this.specialModelName = specialModelName;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Tag.java
index 1bf671b67801..b29116b4bb2a 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Tag.java
@@ -61,7 +61,7 @@ public Tag id(@jakarta.annotation.Nullable Long id) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -69,7 +69,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -87,7 +87,7 @@ public Tag name(@jakarta.annotation.Nullable String name) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -95,7 +95,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 1c1487bdaa5f..1c248287f66b 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -61,7 +61,7 @@ public TestInlineFreeformAdditionalPropertiesRequest someProperty(@jakarta.annot
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -69,7 +69,7 @@ public String getSomeProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@jakarta.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/TriangleInterface.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/TriangleInterface.java
index 819aae909dc9..7429c8f2cda5 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/TriangleInterface.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/TriangleInterface.java
@@ -57,7 +57,7 @@ public TriangleInterface triangleType(@jakarta.annotation.Nonnull String triangl
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getTriangleType() {
@@ -65,7 +65,7 @@ public String getTriangleType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@jakarta.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/User.java
index ead050aef559..d9eb756a41ea 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/User.java
@@ -112,7 +112,7 @@ public User id(@jakarta.annotation.Nullable Long id) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -120,7 +120,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -138,7 +138,7 @@ public User username(@jakarta.annotation.Nullable String username) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -146,7 +146,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -164,7 +164,7 @@ public User firstName(@jakarta.annotation.Nullable String firstName) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -172,7 +172,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@jakarta.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -190,7 +190,7 @@ public User lastName(@jakarta.annotation.Nullable String lastName) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -198,7 +198,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@jakarta.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -216,7 +216,7 @@ public User email(@jakarta.annotation.Nullable String email) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -224,7 +224,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@jakarta.annotation.Nullable String email) {
     this.email = email;
@@ -242,7 +242,7 @@ public User password(@jakarta.annotation.Nullable String password) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -250,7 +250,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@jakarta.annotation.Nullable String password) {
     this.password = password;
@@ -268,7 +268,7 @@ public User phone(@jakarta.annotation.Nullable String phone) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -276,7 +276,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@jakarta.annotation.Nullable String phone) {
     this.phone = phone;
@@ -294,7 +294,7 @@ public User userStatus(@jakarta.annotation.Nullable Integer userStatus) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -302,7 +302,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@jakarta.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
@@ -320,7 +320,7 @@ public User objectWithNoDeclaredProps(@jakarta.annotation.Nullable Object object
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getObjectWithNoDeclaredProps() {
@@ -328,7 +328,7 @@ public Object getObjectWithNoDeclaredProps() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectWithNoDeclaredProps(@jakarta.annotation.Nullable Object objectWithNoDeclaredProps) {
     this.objectWithNoDeclaredProps = objectWithNoDeclaredProps;
@@ -352,7 +352,7 @@ public Object getObjectWithNoDeclaredPropsNullable() {
         return objectWithNoDeclaredPropsNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getObjectWithNoDeclaredPropsNullable_JsonNullable() {
@@ -386,7 +386,7 @@ public Object getAnyTypeProp() {
         return anyTypeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANY_TYPE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ANY_TYPE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnyTypeProp_JsonNullable() {
@@ -420,7 +420,7 @@ public Object getAnyTypePropNullable() {
         return anyTypePropNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANY_TYPE_PROP_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ANY_TYPE_PROP_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnyTypePropNullable_JsonNullable() {
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Whale.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Whale.java
index 9f5596733bd1..8a01713a1516 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Whale.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Whale.java
@@ -67,7 +67,7 @@ public Whale hasBaleen(@jakarta.annotation.Nullable Boolean hasBaleen) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_HAS_BALEEN)
+  @JsonProperty(value = JSON_PROPERTY_HAS_BALEEN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getHasBaleen() {
@@ -75,7 +75,7 @@ public Boolean getHasBaleen() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_HAS_BALEEN)
+  @JsonProperty(value = JSON_PROPERTY_HAS_BALEEN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setHasBaleen(@jakarta.annotation.Nullable Boolean hasBaleen) {
     this.hasBaleen = hasBaleen;
@@ -93,7 +93,7 @@ public Whale hasTeeth(@jakarta.annotation.Nullable Boolean hasTeeth) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_HAS_TEETH)
+  @JsonProperty(value = JSON_PROPERTY_HAS_TEETH, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getHasTeeth() {
@@ -101,7 +101,7 @@ public Boolean getHasTeeth() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_HAS_TEETH)
+  @JsonProperty(value = JSON_PROPERTY_HAS_TEETH, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setHasTeeth(@jakarta.annotation.Nullable Boolean hasTeeth) {
     this.hasTeeth = hasTeeth;
@@ -120,7 +120,7 @@ public Whale className(@jakarta.annotation.Nonnull String className) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -128,7 +128,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Zebra.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Zebra.java
index 120223ccde1a..c97302085fd9 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Zebra.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Zebra.java
@@ -103,7 +103,7 @@ public Zebra type(@jakarta.annotation.Nullable TypeEnum type) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -111,7 +111,7 @@ public TypeEnum getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -130,7 +130,7 @@ public Zebra className(@jakarta.annotation.Nonnull String className) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -138,7 +138,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Category.java
index f90301183daa..022154365c5c 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Category.java
@@ -55,7 +55,7 @@ public class Category  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public Long getId() {
@@ -65,7 +65,7 @@ public Long getId() {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(Long id) {
@@ -81,7 +81,7 @@ public Category id(Long id) {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "name")
   public String getName() {
@@ -91,7 +91,7 @@ public String getName() {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "name")
   public void setName(String name) {
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 334229b6626f..8e7da5c59795 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -61,7 +61,7 @@ public class ModelApiResponse  {
    * Get code
    * @return code
    **/
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "code")
   public Integer getCode() {
@@ -71,7 +71,7 @@ public Integer getCode() {
   /**
    * Set code
    */
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "code")
   public void setCode(Integer code) {
@@ -87,7 +87,7 @@ public ModelApiResponse code(Integer code) {
    * Get type
    * @return type
    **/
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "type")
   public String getType() {
@@ -97,7 +97,7 @@ public String getType() {
   /**
    * Set type
    */
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "type")
   public void setType(String type) {
@@ -113,7 +113,7 @@ public ModelApiResponse type(String type) {
    * Get message
    * @return message
    **/
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "message")
   public String getMessage() {
@@ -123,7 +123,7 @@ public String getMessage() {
   /**
    * Set message
    */
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "message")
   public void setMessage(String message) {
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Order.java
index 14d273215c1b..e083dc1632e2 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Order.java
@@ -112,7 +112,7 @@ public static StatusEnum fromValue(String v) {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public Long getId() {
@@ -122,7 +122,7 @@ public Long getId() {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(Long id) {
@@ -138,7 +138,7 @@ public Order id(Long id) {
    * Get petId
    * @return petId
    **/
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "petId")
   public Long getPetId() {
@@ -148,7 +148,7 @@ public Long getPetId() {
   /**
    * Set petId
    */
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "petId")
   public void setPetId(Long petId) {
@@ -164,7 +164,7 @@ public Order petId(Long petId) {
    * Get quantity
    * @return quantity
    **/
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "quantity")
   public Integer getQuantity() {
@@ -174,7 +174,7 @@ public Integer getQuantity() {
   /**
    * Set quantity
    */
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "quantity")
   public void setQuantity(Integer quantity) {
@@ -190,7 +190,7 @@ public Order quantity(Integer quantity) {
    * Get shipDate
    * @return shipDate
    **/
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "shipDate")
   public Date getShipDate() {
@@ -200,7 +200,7 @@ public Date getShipDate() {
   /**
    * Set shipDate
    */
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "shipDate")
   public void setShipDate(Date shipDate) {
@@ -216,7 +216,7 @@ public Order shipDate(Date shipDate) {
    * Order Status
    * @return status
    **/
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "status")
    public String getStatus() {
@@ -229,7 +229,7 @@ public String getStatus() {
   /**
    * Set status
    */
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "status")
   public void setStatus(StatusEnum status) {
@@ -245,7 +245,7 @@ public Order status(StatusEnum status) {
    * Get complete
    * @return complete
    **/
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "complete")
   public Boolean getComplete() {
@@ -255,7 +255,7 @@ public Boolean getComplete() {
   /**
    * Set complete
    */
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "complete")
   public void setComplete(Boolean complete) {
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Pet.java
index 74cf6d7ec2ca..9b64834c2155 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Pet.java
@@ -118,7 +118,7 @@ public static StatusEnum fromValue(String v) {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public Long getId() {
@@ -128,7 +128,7 @@ public Long getId() {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(Long id) {
@@ -144,7 +144,7 @@ public Pet id(Long id) {
    * Get category
    * @return category
    **/
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "Category")
   public Category getCategory() {
@@ -154,7 +154,7 @@ public Category getCategory() {
   /**
    * Set category
    */
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "Category")
   public void setCategory(Category category) {
@@ -170,7 +170,7 @@ public Pet category(Category category) {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "name")
   public String getName() {
@@ -180,7 +180,7 @@ public String getName() {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "name")
   public void setName(String name) {
@@ -196,7 +196,7 @@ public Pet name(String name) {
    * Get photoUrls
    * @return photoUrls
    **/
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "photoUrl")
   @JacksonXmlElementWrapper(localName = "photoUrl", useWrapping = true)
@@ -207,7 +207,7 @@ public List<String> getPhotoUrls() {
   /**
    * Set photoUrls
    */
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "photoUrl")
   @JacksonXmlElementWrapper(localName = "photoUrl", useWrapping = true)
@@ -232,7 +232,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * Get tags
    * @return tags
    **/
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "Tag")
   @JacksonXmlElementWrapper(localName = "tag", useWrapping = true)
@@ -243,7 +243,7 @@ public List<Tag> getTags() {
   /**
    * Set tags
    */
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "Tag")
   @JacksonXmlElementWrapper(localName = "tag", useWrapping = true)
@@ -270,7 +270,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @deprecated
    **/
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "status")
    public String getStatus() {
@@ -283,7 +283,7 @@ public String getStatus() {
   /**
    * Set status
    */
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "status")
   public void setStatus(StatusEnum status) {
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Tag.java
index f74a6e14dcfa..8223731dad44 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Tag.java
@@ -55,7 +55,7 @@ public class Tag  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public Long getId() {
@@ -65,7 +65,7 @@ public Long getId() {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(Long id) {
@@ -81,7 +81,7 @@ public Tag id(Long id) {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "name")
   public String getName() {
@@ -91,7 +91,7 @@ public String getName() {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "name")
   public void setName(String name) {
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/User.java
index 1d571783f608..b4d74cbbc9c2 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/User.java
@@ -88,7 +88,7 @@ public class User  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public Long getId() {
@@ -98,7 +98,7 @@ public Long getId() {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(Long id) {
@@ -114,7 +114,7 @@ public User id(Long id) {
    * Get username
    * @return username
    **/
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "username")
   public String getUsername() {
@@ -124,7 +124,7 @@ public String getUsername() {
   /**
    * Set username
    */
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "username")
   public void setUsername(String username) {
@@ -140,7 +140,7 @@ public User username(String username) {
    * Get firstName
    * @return firstName
    **/
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "firstName")
   public String getFirstName() {
@@ -150,7 +150,7 @@ public String getFirstName() {
   /**
    * Set firstName
    */
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "firstName")
   public void setFirstName(String firstName) {
@@ -166,7 +166,7 @@ public User firstName(String firstName) {
    * Get lastName
    * @return lastName
    **/
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "lastName")
   public String getLastName() {
@@ -176,7 +176,7 @@ public String getLastName() {
   /**
    * Set lastName
    */
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "lastName")
   public void setLastName(String lastName) {
@@ -192,7 +192,7 @@ public User lastName(String lastName) {
    * Get email
    * @return email
    **/
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "email")
   public String getEmail() {
@@ -202,7 +202,7 @@ public String getEmail() {
   /**
    * Set email
    */
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "email")
   public void setEmail(String email) {
@@ -218,7 +218,7 @@ public User email(String email) {
    * Get password
    * @return password
    **/
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "password")
   public String getPassword() {
@@ -228,7 +228,7 @@ public String getPassword() {
   /**
    * Set password
    */
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "password")
   public void setPassword(String password) {
@@ -244,7 +244,7 @@ public User password(String password) {
    * Get phone
    * @return phone
    **/
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "phone")
   public String getPhone() {
@@ -254,7 +254,7 @@ public String getPhone() {
   /**
    * Set phone
    */
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "phone")
   public void setPhone(String phone) {
@@ -270,7 +270,7 @@ public User phone(String phone) {
    * User Status
    * @return userStatus
    **/
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "userStatus")
   public Integer getUserStatus() {
@@ -280,7 +280,7 @@ public Integer getUserStatus() {
   /**
    * Set userStatus
    */
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "userStatus")
   public void setUserStatus(Integer userStatus) {
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index be4be5765e0c..5a6e4301e8f1 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -45,7 +45,7 @@ public class AdditionalPropertiesClass  {
    * Get mapProperty
    * @return mapProperty
    **/
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, String> getMapProperty() {
     return mapProperty;
@@ -54,7 +54,7 @@ public Map<String, String> getMapProperty() {
   /**
    * Set mapProperty
    */
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -77,7 +77,7 @@ public AdditionalPropertiesClass putMapPropertyItem(String key, String mapProper
    * Get mapOfMapProperty
    * @return mapOfMapProperty
    **/
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Map<String, String>> getMapOfMapProperty() {
     return mapOfMapProperty;
@@ -86,7 +86,7 @@ public Map<String, Map<String, String>> getMapOfMapProperty() {
   /**
    * Set mapOfMapProperty
    */
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 53c0cb73bf2b..e398f91c7d8f 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -44,7 +44,7 @@ public class AllOfWithSingleRef  {
    * Get username
    * @return username
    **/
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getUsername() {
     return username;
@@ -53,7 +53,7 @@ public String getUsername() {
   /**
    * Set username
    */
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(String username) {
     this.username = username;
@@ -68,7 +68,7 @@ public AllOfWithSingleRef username(String username) {
    * Get singleRefType
    * @return singleRefType
    **/
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public SingleRefType getSingleRefType() {
     return singleRefType;
@@ -77,7 +77,7 @@ public SingleRefType getSingleRefType() {
   /**
    * Set singleRefType
    */
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Animal.java
index d1d133daa3fa..191e86ff5525 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Animal.java
@@ -56,7 +56,7 @@ public class Animal  {
    * Get className
    * @return className
    **/
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
@@ -65,7 +65,7 @@ public String getClassName() {
   /**
    * Set className
    */
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(String className) {
     this.className = className;
@@ -80,7 +80,7 @@ public Animal className(String className) {
    * Get color
    * @return color
    **/
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getColor() {
     return color;
@@ -89,7 +89,7 @@ public String getColor() {
   /**
    * Set color
    */
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 633f5951245a..9ec58cdd30de 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -42,7 +42,7 @@ public class ArrayOfArrayOfNumberOnly  {
    * Get arrayArrayNumber
    * @return arrayArrayNumber
    **/
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<List<BigDecimal>> getArrayArrayNumber() {
     return arrayArrayNumber;
@@ -51,7 +51,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   /**
    * Set arrayArrayNumber
    */
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index eee630e931e7..b83669ab2e07 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -42,7 +42,7 @@ public class ArrayOfNumberOnly  {
    * Get arrayNumber
    * @return arrayNumber
    **/
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<BigDecimal> getArrayNumber() {
     return arrayNumber;
@@ -51,7 +51,7 @@ public List<BigDecimal> getArrayNumber() {
   /**
    * Set arrayNumber
    */
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayTest.java
index 54969eb9ad64..97e2386afcd3 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -52,7 +52,7 @@ public class ArrayTest  {
    * Get arrayOfString
    * @return arrayOfString
    **/
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<String> getArrayOfString() {
     return arrayOfString;
@@ -61,7 +61,7 @@ public List<String> getArrayOfString() {
   /**
    * Set arrayOfString
    */
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -84,7 +84,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    * Get arrayArrayOfInteger
    * @return arrayArrayOfInteger
    **/
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<List<Long>> getArrayArrayOfInteger() {
     return arrayArrayOfInteger;
@@ -93,7 +93,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   /**
    * Set arrayArrayOfInteger
    */
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -116,7 +116,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    * Get arrayArrayOfModel
    * @return arrayArrayOfModel
    **/
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
     return arrayArrayOfModel;
@@ -125,7 +125,7 @@ public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
   /**
    * Set arrayArrayOfModel
    */
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Capitalization.java
index 5c6131e7761b..938657fdd43b 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -66,7 +66,7 @@ public class Capitalization  {
    * Get smallCamel
    * @return smallCamel
    **/
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSmallCamel() {
     return smallCamel;
@@ -75,7 +75,7 @@ public String getSmallCamel() {
   /**
    * Set smallCamel
    */
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(String smallCamel) {
     this.smallCamel = smallCamel;
@@ -90,7 +90,7 @@ public Capitalization smallCamel(String smallCamel) {
    * Get capitalCamel
    * @return capitalCamel
    **/
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getCapitalCamel() {
     return capitalCamel;
@@ -99,7 +99,7 @@ public String getCapitalCamel() {
   /**
    * Set capitalCamel
    */
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -114,7 +114,7 @@ public Capitalization capitalCamel(String capitalCamel) {
    * Get smallSnake
    * @return smallSnake
    **/
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSmallSnake() {
     return smallSnake;
@@ -123,7 +123,7 @@ public String getSmallSnake() {
   /**
    * Set smallSnake
    */
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(String smallSnake) {
     this.smallSnake = smallSnake;
@@ -138,7 +138,7 @@ public Capitalization smallSnake(String smallSnake) {
    * Get capitalSnake
    * @return capitalSnake
    **/
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getCapitalSnake() {
     return capitalSnake;
@@ -147,7 +147,7 @@ public String getCapitalSnake() {
   /**
    * Set capitalSnake
    */
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -162,7 +162,7 @@ public Capitalization capitalSnake(String capitalSnake) {
    * Get scAETHFlowPoints
    * @return scAETHFlowPoints
    **/
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getScAETHFlowPoints() {
     return scAETHFlowPoints;
@@ -171,7 +171,7 @@ public String getScAETHFlowPoints() {
   /**
    * Set scAETHFlowPoints
    */
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -186,7 +186,7 @@ public Capitalization scAETHFlowPoints(String scAETHFlowPoints) {
    * Name of the pet 
    * @return ATT_NAME
    **/
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getATTNAME() {
     return ATT_NAME;
@@ -195,7 +195,7 @@ public String getATTNAME() {
   /**
    * Set ATT_NAME
    */
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Cat.java
index f8ee048670a1..a593ca8bfa31 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Cat.java
@@ -48,7 +48,7 @@ public class Cat extends Animal {
    * Get declawed
    * @return declawed
    **/
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getDeclawed() {
     return declawed;
@@ -57,7 +57,7 @@ public Boolean getDeclawed() {
   /**
    * Set declawed
    */
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Category.java
index 28e0277c8ae7..6b62dd162f61 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Category.java
@@ -43,7 +43,7 @@ public class Category  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -52,7 +52,7 @@ public Long getId() {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -67,7 +67,7 @@ public Category id(Long id) {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getName() {
     return name;
@@ -76,7 +76,7 @@ public String getName() {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index 4c315942c2c1..f027cfee5b3c 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -48,7 +48,7 @@ public class ChildWithNullable extends ParentWithNullable {
    * Get otherProperty
    * @return otherProperty
    **/
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getOtherProperty() {
     return otherProperty;
@@ -57,7 +57,7 @@ public String getOtherProperty() {
   /**
    * Set otherProperty
    */
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ClassModel.java
index 5001a36e341d..593f911897f0 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -41,7 +41,7 @@ public class ClassModel  {
    * Get propertyClass
    * @return propertyClass
    **/
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPropertyClass() {
     return propertyClass;
@@ -50,7 +50,7 @@ public String getPropertyClass() {
   /**
    * Set propertyClass
    */
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Client.java
index 74256bdbc46e..67f26adce83f 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Client.java
@@ -38,7 +38,7 @@ public class Client  {
    * Get client
    * @return client
    **/
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getClient() {
     return client;
@@ -47,7 +47,7 @@ public String getClient() {
   /**
    * Set client
    */
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 84f363f42802..b6e68f9eee87 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -38,7 +38,7 @@ public class DeprecatedObject  {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
@@ -47,7 +47,7 @@ public String getName() {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Dog.java
index a40c4f416e02..94052b0f0054 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Dog.java
@@ -48,7 +48,7 @@ public class Dog extends Animal {
    * Get breed
    * @return breed
    **/
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBreed() {
     return breed;
@@ -57,7 +57,7 @@ public String getBreed() {
   /**
    * Set breed
    */
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/EnumArrays.java
index 4c3728a3d099..9235d5c3b0bb 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -110,7 +110,7 @@ public static ArrayEnumEnum fromValue(String value) {
    * Get justSymbol
    * @return justSymbol
    **/
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public JustSymbolEnum getJustSymbol() {
     return justSymbol;
@@ -119,7 +119,7 @@ public JustSymbolEnum getJustSymbol() {
   /**
    * Set justSymbol
    */
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -134,7 +134,7 @@ public EnumArrays justSymbol(JustSymbolEnum justSymbol) {
    * Get arrayEnum
    * @return arrayEnum
    **/
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<ArrayEnumEnum> getArrayEnum() {
     return arrayEnum;
@@ -143,7 +143,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   /**
    * Set arrayEnum
    */
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/EnumTest.java
index c896035c6e69..f8de5e433909 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -206,7 +206,7 @@ public static EnumNumberEnum fromValue(Double value) {
    * Get enumString
    * @return enumString
    **/
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumStringEnum getEnumString() {
     return enumString;
@@ -215,7 +215,7 @@ public EnumStringEnum getEnumString() {
   /**
    * Set enumString
    */
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -230,7 +230,7 @@ public EnumTest enumString(EnumStringEnum enumString) {
    * Get enumStringRequired
    * @return enumStringRequired
    **/
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public EnumStringRequiredEnum getEnumStringRequired() {
     return enumStringRequired;
@@ -239,7 +239,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   /**
    * Set enumStringRequired
    */
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -254,7 +254,7 @@ public EnumTest enumStringRequired(EnumStringRequiredEnum enumStringRequired) {
    * Get enumInteger
    * @return enumInteger
    **/
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumIntegerEnum getEnumInteger() {
     return enumInteger;
@@ -263,7 +263,7 @@ public EnumIntegerEnum getEnumInteger() {
   /**
    * Set enumInteger
    */
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -278,7 +278,7 @@ public EnumTest enumInteger(EnumIntegerEnum enumInteger) {
    * Get enumNumber
    * @return enumNumber
    **/
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumNumberEnum getEnumNumber() {
     return enumNumber;
@@ -287,7 +287,7 @@ public EnumNumberEnum getEnumNumber() {
   /**
    * Set enumNumber
    */
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -302,7 +302,7 @@ public EnumTest enumNumber(EnumNumberEnum enumNumber) {
    * Get outerEnum
    * @return outerEnum
    **/
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OuterEnum getOuterEnum() {
     return outerEnum;
@@ -311,7 +311,7 @@ public OuterEnum getOuterEnum() {
   /**
    * Set outerEnum
    */
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnum(OuterEnum outerEnum) {
     this.outerEnum = outerEnum;
@@ -326,7 +326,7 @@ public EnumTest outerEnum(OuterEnum outerEnum) {
    * Get outerEnumInteger
    * @return outerEnumInteger
    **/
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OuterEnumInteger getOuterEnumInteger() {
     return outerEnumInteger;
@@ -335,7 +335,7 @@ public OuterEnumInteger getOuterEnumInteger() {
   /**
    * Set outerEnumInteger
    */
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -350,7 +350,7 @@ public EnumTest outerEnumInteger(OuterEnumInteger outerEnumInteger) {
    * Get outerEnumDefaultValue
    * @return outerEnumDefaultValue
    **/
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
     return outerEnumDefaultValue;
@@ -359,7 +359,7 @@ public OuterEnumDefaultValue getOuterEnumDefaultValue() {
   /**
    * Set outerEnumDefaultValue
    */
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -374,7 +374,7 @@ public EnumTest outerEnumDefaultValue(OuterEnumDefaultValue outerEnumDefaultValu
    * Get outerEnumIntegerDefaultValue
    * @return outerEnumIntegerDefaultValue
    **/
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
     return outerEnumIntegerDefaultValue;
@@ -383,7 +383,7 @@ public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
   /**
    * Set outerEnumIntegerDefaultValue
    */
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 9229df6b454f..4d12510cc923 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -47,7 +47,7 @@ public class FakeBigDecimalMap200Response  {
    * Get someId
    * @return someId
    **/
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getSomeId() {
     return someId;
@@ -56,7 +56,7 @@ public BigDecimal getSomeId() {
   /**
    * Set someId
    */
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(BigDecimal someId) {
     this.someId = someId;
@@ -71,7 +71,7 @@ public FakeBigDecimalMap200Response someId(BigDecimal someId) {
    * Get someMap
    * @return someMap
    **/
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, BigDecimal> getSomeMap() {
     return someMap;
@@ -80,7 +80,7 @@ public Map<String, BigDecimal> getSomeMap() {
   /**
    * Set someMap
    */
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 18dd00075932..51108c634b12 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -47,7 +47,7 @@ public class FileSchemaTestClass  {
    * Get _file
    * @return _file
    **/
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public ModelFile getFile() {
     return _file;
@@ -56,7 +56,7 @@ public ModelFile getFile() {
   /**
    * Set _file
    */
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(ModelFile _file) {
     this._file = _file;
@@ -71,7 +71,7 @@ public FileSchemaTestClass _file(ModelFile _file) {
    * Get files
    * @return files
    **/
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<ModelFile> getFiles() {
     return files;
@@ -80,7 +80,7 @@ public List<ModelFile> getFiles() {
   /**
    * Set files
    */
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Foo.java
index 5a4027297bc9..ffb6ac44d3a1 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Foo.java
@@ -38,7 +38,7 @@ public class Foo  {
    * Get bar
    * @return bar
    **/
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBar() {
     return bar;
@@ -47,7 +47,7 @@ public String getBar() {
   /**
    * Set bar
    */
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index b7402dc34a80..05736c64a5d4 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -40,7 +40,7 @@ public class FooGetDefaultResponse  {
    * Get string
    * @return string
    **/
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Foo getString() {
     return string;
@@ -49,7 +49,7 @@ public Foo getString() {
   /**
    * Set string
    */
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FormatTest.java
index 67d54cf4552d..7494d71f9f8c 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -126,7 +126,7 @@ public class FormatTest  {
    * maximum: 100
    * @return integer
    **/
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getInteger() {
     return integer;
@@ -135,7 +135,7 @@ public Integer getInteger() {
   /**
    * Set integer
    */
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(Integer integer) {
     this.integer = integer;
@@ -152,7 +152,7 @@ public FormatTest integer(Integer integer) {
    * maximum: 200
    * @return int32
    **/
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getInt32() {
     return int32;
@@ -161,7 +161,7 @@ public Integer getInt32() {
   /**
    * Set int32
    */
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(Integer int32) {
     this.int32 = int32;
@@ -176,7 +176,7 @@ public FormatTest int32(Integer int32) {
    * Get int64
    * @return int64
    **/
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getInt64() {
     return int64;
@@ -185,7 +185,7 @@ public Long getInt64() {
   /**
    * Set int64
    */
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(Long int64) {
     this.int64 = int64;
@@ -202,7 +202,7 @@ public FormatTest int64(Long int64) {
    * maximum: 543.2
    * @return number
    **/
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public BigDecimal getNumber() {
     return number;
@@ -211,7 +211,7 @@ public BigDecimal getNumber() {
   /**
    * Set number
    */
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(BigDecimal number) {
     this.number = number;
@@ -228,7 +228,7 @@ public FormatTest number(BigDecimal number) {
    * maximum: 987.6
    * @return _float
    **/
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Float getFloat() {
     return _float;
@@ -237,7 +237,7 @@ public Float getFloat() {
   /**
    * Set _float
    */
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(Float _float) {
     this._float = _float;
@@ -254,7 +254,7 @@ public FormatTest _float(Float _float) {
    * maximum: 123.4
    * @return _double
    **/
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Double getDouble() {
     return _double;
@@ -263,7 +263,7 @@ public Double getDouble() {
   /**
    * Set _double
    */
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(Double _double) {
     this._double = _double;
@@ -278,7 +278,7 @@ public FormatTest _double(Double _double) {
    * Get decimal
    * @return decimal
    **/
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getDecimal() {
     return decimal;
@@ -287,7 +287,7 @@ public BigDecimal getDecimal() {
   /**
    * Set decimal
    */
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(BigDecimal decimal) {
     this.decimal = decimal;
@@ -302,7 +302,7 @@ public FormatTest decimal(BigDecimal decimal) {
    * Get string
    * @return string
    **/
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getString() {
     return string;
@@ -311,7 +311,7 @@ public String getString() {
   /**
    * Set string
    */
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(String string) {
     this.string = string;
@@ -326,7 +326,7 @@ public FormatTest string(String string) {
    * Get _byte
    * @return _byte
    **/
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public byte[] getByte() {
     return _byte;
@@ -335,7 +335,7 @@ public byte[] getByte() {
   /**
    * Set _byte
    */
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(byte[] _byte) {
     this._byte = _byte;
@@ -350,7 +350,7 @@ public FormatTest _byte(byte[] _byte) {
    * Get binary
    * @return binary
    **/
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public File getBinary() {
     return binary;
@@ -359,7 +359,7 @@ public File getBinary() {
   /**
    * Set binary
    */
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(File binary) {
     this.binary = binary;
@@ -374,7 +374,7 @@ public FormatTest binary(File binary) {
    * Get date
    * @return date
    **/
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public Date getDate() {
     return date;
@@ -383,7 +383,7 @@ public Date getDate() {
   /**
    * Set date
    */
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(Date date) {
     this.date = date;
@@ -398,7 +398,7 @@ public FormatTest date(Date date) {
    * Get dateTime
    * @return dateTime
    **/
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Date getDateTime() {
     return dateTime;
@@ -407,7 +407,7 @@ public Date getDateTime() {
   /**
    * Set dateTime
    */
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(Date dateTime) {
     this.dateTime = dateTime;
@@ -422,7 +422,7 @@ public FormatTest dateTime(Date dateTime) {
    * Get uuid
    * @return uuid
    **/
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public UUID getUuid() {
     return uuid;
@@ -431,7 +431,7 @@ public UUID getUuid() {
   /**
    * Set uuid
    */
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(UUID uuid) {
     this.uuid = uuid;
@@ -446,7 +446,7 @@ public FormatTest uuid(UUID uuid) {
    * Get password
    * @return password
    **/
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getPassword() {
     return password;
@@ -455,7 +455,7 @@ public String getPassword() {
   /**
    * Set password
    */
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(String password) {
     this.password = password;
@@ -470,7 +470,7 @@ public FormatTest password(String password) {
    * A string that is a 10 digit number. Can have leading zeros.
    * @return patternWithDigits
    **/
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPatternWithDigits() {
     return patternWithDigits;
@@ -479,7 +479,7 @@ public String getPatternWithDigits() {
   /**
    * Set patternWithDigits
    */
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -494,7 +494,7 @@ public FormatTest patternWithDigits(String patternWithDigits) {
    * A string starting with &#39;image_&#39; (case insensitive) and one to three digits following i.e. Image_01.
    * @return patternWithDigitsAndDelimiter
    **/
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPatternWithDigitsAndDelimiter() {
     return patternWithDigitsAndDelimiter;
@@ -503,7 +503,7 @@ public String getPatternWithDigitsAndDelimiter() {
   /**
    * Set patternWithDigitsAndDelimiter
    */
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 78de93c838b1..470ac2ef007a 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -56,7 +56,7 @@ public HasOnlyReadOnly(
    * Get bar
    * @return bar
    **/
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBar() {
     return bar;
@@ -67,7 +67,7 @@ public String getBar() {
    * Get foo
    * @return foo
    **/
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getFoo() {
     return foo;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index faeae0f51c2d..dbf1362b40ce 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -41,7 +41,7 @@ public class HealthCheckResult  {
    * Get nullableMessage
    * @return nullableMessage
    **/
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getNullableMessage() {
     return nullableMessage;
@@ -50,7 +50,7 @@ public String getNullableMessage() {
   /**
    * Set nullableMessage
    */
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNullableMessage(String nullableMessage) {
     this.nullableMessage = nullableMessage;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/MapTest.java
index 5adaa6bb314f..fbc6f5f9082d 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/MapTest.java
@@ -87,7 +87,7 @@ public static InnerEnum fromValue(String value) {
    * Get mapMapOfString
    * @return mapMapOfString
    **/
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Map<String, String>> getMapMapOfString() {
     return mapMapOfString;
@@ -96,7 +96,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   /**
    * Set mapMapOfString
    */
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -119,7 +119,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    * Get mapOfEnumString
    * @return mapOfEnumString
    **/
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, InnerEnum> getMapOfEnumString() {
     return mapOfEnumString;
@@ -128,7 +128,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   /**
    * Set mapOfEnumString
    */
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -151,7 +151,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    * Get directMap
    * @return directMap
    **/
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Boolean> getDirectMap() {
     return directMap;
@@ -160,7 +160,7 @@ public Map<String, Boolean> getDirectMap() {
   /**
    * Set directMap
    */
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -183,7 +183,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    * Get indirectMap
    * @return indirectMap
    **/
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Boolean> getIndirectMap() {
     return indirectMap;
@@ -192,7 +192,7 @@ public Map<String, Boolean> getIndirectMap() {
   /**
    * Set indirectMap
    */
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 78060d4ef767..17df9b11fa9a 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -53,7 +53,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass  {
    * Get uuid
    * @return uuid
    **/
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public UUID getUuid() {
     return uuid;
@@ -62,7 +62,7 @@ public UUID getUuid() {
   /**
    * Set uuid
    */
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(UUID uuid) {
     this.uuid = uuid;
@@ -77,7 +77,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(UUID uuid) {
    * Get dateTime
    * @return dateTime
    **/
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Date getDateTime() {
     return dateTime;
@@ -86,7 +86,7 @@ public Date getDateTime() {
   /**
    * Set dateTime
    */
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(Date dateTime) {
     this.dateTime = dateTime;
@@ -101,7 +101,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(Date dateTime) {
    * Get map
    * @return map
    **/
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Animal> getMap() {
     return map;
@@ -110,7 +110,7 @@ public Map<String, Animal> getMap() {
   /**
    * Set map
    */
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Model200Response.java
index 56557b9ab1e2..3a5666f20a57 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -47,7 +47,7 @@ public class Model200Response  {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getName() {
     return name;
@@ -56,7 +56,7 @@ public Integer getName() {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(Integer name) {
     this.name = name;
@@ -71,7 +71,7 @@ public Model200Response name(Integer name) {
    * Get propertyClass
    * @return propertyClass
    **/
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPropertyClass() {
     return propertyClass;
@@ -80,7 +80,7 @@ public String getPropertyClass() {
   /**
    * Set propertyClass
    */
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 8539f1173a92..fc6cade466f6 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -49,7 +49,7 @@ public class ModelApiResponse  {
    * Get code
    * @return code
    **/
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getCode() {
     return code;
@@ -58,7 +58,7 @@ public Integer getCode() {
   /**
    * Set code
    */
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(Integer code) {
     this.code = code;
@@ -73,7 +73,7 @@ public ModelApiResponse code(Integer code) {
    * Get type
    * @return type
    **/
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getType() {
     return type;
@@ -82,7 +82,7 @@ public String getType() {
   /**
    * Set type
    */
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(String type) {
     this.type = type;
@@ -97,7 +97,7 @@ public ModelApiResponse type(String type) {
    * Get message
    * @return message
    **/
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getMessage() {
     return message;
@@ -106,7 +106,7 @@ public String getMessage() {
   /**
    * Set message
    */
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelFile.java
index 77a5d760f0fa..ec76b64efa88 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -45,7 +45,7 @@ public class ModelFile  {
    * Test capitalization
    * @return sourceURI
    **/
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSourceURI() {
     return sourceURI;
@@ -54,7 +54,7 @@ public String getSourceURI() {
   /**
    * Set sourceURI
    */
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelList.java
index 27814afbd025..617343a24888 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelList.java
@@ -39,7 +39,7 @@ public class ModelList  {
    * Get _123list
    * @return _123list
    **/
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String get123list() {
     return _123list;
@@ -48,7 +48,7 @@ public String get123list() {
   /**
    * Set _123list
    */
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelReturn.java
index 53c7bc7623c9..ec172ddc8cac 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -42,7 +42,7 @@ public class ModelReturn  {
    * Get _return
    * @return _return
    **/
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getReturn() {
     return _return;
@@ -51,7 +51,7 @@ public Integer getReturn() {
   /**
    * Set _return
    */
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Name.java
index 81ab3e3d38da..ad3614c95022 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Name.java
@@ -68,7 +68,7 @@ public Name(
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public Integer getName() {
     return name;
@@ -77,7 +77,7 @@ public Integer getName() {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(Integer name) {
     this.name = name;
@@ -92,7 +92,7 @@ public Name name(Integer name) {
    * Get snakeCase
    * @return snakeCase
    **/
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getSnakeCase() {
     return snakeCase;
@@ -103,7 +103,7 @@ public Integer getSnakeCase() {
    * Get property
    * @return property
    **/
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getProperty() {
     return property;
@@ -112,7 +112,7 @@ public String getProperty() {
   /**
    * Set property
    */
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(String property) {
     this.property = property;
@@ -127,7 +127,7 @@ public Name property(String property) {
    * Get _123number
    * @return _123number
    **/
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer get123number() {
     return _123number;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/NullableClass.java
index 059c3597bcb0..45a34fe7d31e 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -100,7 +100,7 @@ public class NullableClass extends HashMap<String, Object> {
    * Get integerProp
    * @return integerProp
    **/
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getIntegerProp() {
     return integerProp;
@@ -109,7 +109,7 @@ public Integer getIntegerProp() {
   /**
    * Set integerProp
    */
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIntegerProp(Integer integerProp) {
     this.integerProp = integerProp;
@@ -124,7 +124,7 @@ public NullableClass integerProp(Integer integerProp) {
    * Get numberProp
    * @return numberProp
    **/
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getNumberProp() {
     return numberProp;
@@ -133,7 +133,7 @@ public BigDecimal getNumberProp() {
   /**
    * Set numberProp
    */
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNumberProp(BigDecimal numberProp) {
     this.numberProp = numberProp;
@@ -148,7 +148,7 @@ public NullableClass numberProp(BigDecimal numberProp) {
    * Get booleanProp
    * @return booleanProp
    **/
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getBooleanProp() {
     return booleanProp;
@@ -157,7 +157,7 @@ public Boolean getBooleanProp() {
   /**
    * Set booleanProp
    */
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBooleanProp(Boolean booleanProp) {
     this.booleanProp = booleanProp;
@@ -172,7 +172,7 @@ public NullableClass booleanProp(Boolean booleanProp) {
    * Get stringProp
    * @return stringProp
    **/
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getStringProp() {
     return stringProp;
@@ -181,7 +181,7 @@ public String getStringProp() {
   /**
    * Set stringProp
    */
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStringProp(String stringProp) {
     this.stringProp = stringProp;
@@ -196,7 +196,7 @@ public NullableClass stringProp(String stringProp) {
    * Get dateProp
    * @return dateProp
    **/
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Date getDateProp() {
     return dateProp;
@@ -205,7 +205,7 @@ public Date getDateProp() {
   /**
    * Set dateProp
    */
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateProp(Date dateProp) {
     this.dateProp = dateProp;
@@ -220,7 +220,7 @@ public NullableClass dateProp(Date dateProp) {
    * Get datetimeProp
    * @return datetimeProp
    **/
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Date getDatetimeProp() {
     return datetimeProp;
@@ -229,7 +229,7 @@ public Date getDatetimeProp() {
   /**
    * Set datetimeProp
    */
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDatetimeProp(Date datetimeProp) {
     this.datetimeProp = datetimeProp;
@@ -244,7 +244,7 @@ public NullableClass datetimeProp(Date datetimeProp) {
    * Get arrayNullableProp
    * @return arrayNullableProp
    **/
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Object> getArrayNullableProp() {
     return arrayNullableProp;
@@ -253,7 +253,7 @@ public List<Object> getArrayNullableProp() {
   /**
    * Set arrayNullableProp
    */
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNullableProp(List<Object> arrayNullableProp) {
     this.arrayNullableProp = arrayNullableProp;
@@ -276,7 +276,7 @@ public NullableClass addArrayNullablePropItem(Object arrayNullablePropItem) {
    * Get arrayAndItemsNullableProp
    * @return arrayAndItemsNullableProp
    **/
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Object> getArrayAndItemsNullableProp() {
     return arrayAndItemsNullableProp;
@@ -285,7 +285,7 @@ public List<Object> getArrayAndItemsNullableProp() {
   /**
    * Set arrayAndItemsNullableProp
    */
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayAndItemsNullableProp(List<Object> arrayAndItemsNullableProp) {
     this.arrayAndItemsNullableProp = arrayAndItemsNullableProp;
@@ -308,7 +308,7 @@ public NullableClass addArrayAndItemsNullablePropItem(Object arrayAndItemsNullab
    * Get arrayItemsNullable
    * @return arrayItemsNullable
    **/
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Object> getArrayItemsNullable() {
     return arrayItemsNullable;
@@ -317,7 +317,7 @@ public List<Object> getArrayItemsNullable() {
   /**
    * Set arrayItemsNullable
    */
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -340,7 +340,7 @@ public NullableClass addArrayItemsNullableItem(Object arrayItemsNullableItem) {
    * Get objectNullableProp
    * @return objectNullableProp
    **/
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Object> getObjectNullableProp() {
     return objectNullableProp;
@@ -349,7 +349,7 @@ public Map<String, Object> getObjectNullableProp() {
   /**
    * Set objectNullableProp
    */
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectNullableProp(Map<String, Object> objectNullableProp) {
     this.objectNullableProp = objectNullableProp;
@@ -372,7 +372,7 @@ public NullableClass putObjectNullablePropItem(String key, Object objectNullable
    * Get objectAndItemsNullableProp
    * @return objectAndItemsNullableProp
    **/
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Object> getObjectAndItemsNullableProp() {
     return objectAndItemsNullableProp;
@@ -381,7 +381,7 @@ public Map<String, Object> getObjectAndItemsNullableProp() {
   /**
    * Set objectAndItemsNullableProp
    */
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectAndItemsNullableProp(Map<String, Object> objectAndItemsNullableProp) {
     this.objectAndItemsNullableProp = objectAndItemsNullableProp;
@@ -404,7 +404,7 @@ public NullableClass putObjectAndItemsNullablePropItem(String key, Object object
    * Get objectItemsNullable
    * @return objectItemsNullable
    **/
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Object> getObjectItemsNullable() {
     return objectItemsNullable;
@@ -413,7 +413,7 @@ public Map<String, Object> getObjectItemsNullable() {
   /**
    * Set objectItemsNullable
    */
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/NumberOnly.java
index 6a9ffb70ff3c..e2f75eeb1d0c 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -39,7 +39,7 @@ public class NumberOnly  {
    * Get justNumber
    * @return justNumber
    **/
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getJustNumber() {
     return justNumber;
@@ -48,7 +48,7 @@ public BigDecimal getJustNumber() {
   /**
    * Set justNumber
    */
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 226bd6c44c93..66399594b9a8 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -58,7 +58,7 @@ public class ObjectWithDeprecatedFields  {
    * Get uuid
    * @return uuid
    **/
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getUuid() {
     return uuid;
@@ -67,7 +67,7 @@ public String getUuid() {
   /**
    * Set uuid
    */
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(String uuid) {
     this.uuid = uuid;
@@ -84,7 +84,7 @@ public ObjectWithDeprecatedFields uuid(String uuid) {
    * @deprecated
    **/
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getId() {
     return id;
@@ -93,7 +93,7 @@ public BigDecimal getId() {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(BigDecimal id) {
     this.id = id;
@@ -110,7 +110,7 @@ public ObjectWithDeprecatedFields id(BigDecimal id) {
    * @deprecated
    **/
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public DeprecatedObject getDeprecatedRef() {
     return deprecatedRef;
@@ -119,7 +119,7 @@ public DeprecatedObject getDeprecatedRef() {
   /**
    * Set deprecatedRef
    */
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -136,7 +136,7 @@ public ObjectWithDeprecatedFields deprecatedRef(DeprecatedObject deprecatedRef)
    * @deprecated
    **/
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<String> getBars() {
     return bars;
@@ -145,7 +145,7 @@ public List<String> getBars() {
   /**
    * Set bars
    */
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Order.java
index 271bd025d550..7535ebe03232 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Order.java
@@ -99,7 +99,7 @@ public static StatusEnum fromValue(String value) {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -108,7 +108,7 @@ public Long getId() {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -123,7 +123,7 @@ public Order id(Long id) {
    * Get petId
    * @return petId
    **/
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getPetId() {
     return petId;
@@ -132,7 +132,7 @@ public Long getPetId() {
   /**
    * Set petId
    */
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(Long petId) {
     this.petId = petId;
@@ -147,7 +147,7 @@ public Order petId(Long petId) {
    * Get quantity
    * @return quantity
    **/
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getQuantity() {
     return quantity;
@@ -156,7 +156,7 @@ public Integer getQuantity() {
   /**
    * Set quantity
    */
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(Integer quantity) {
     this.quantity = quantity;
@@ -171,7 +171,7 @@ public Order quantity(Integer quantity) {
    * Get shipDate
    * @return shipDate
    **/
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Date getShipDate() {
     return shipDate;
@@ -180,7 +180,7 @@ public Date getShipDate() {
   /**
    * Set shipDate
    */
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(Date shipDate) {
     this.shipDate = shipDate;
@@ -195,7 +195,7 @@ public Order shipDate(Date shipDate) {
    * Order Status
    * @return status
    **/
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
@@ -204,7 +204,7 @@ public StatusEnum getStatus() {
   /**
    * Set status
    */
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(StatusEnum status) {
     this.status = status;
@@ -219,7 +219,7 @@ public Order status(StatusEnum status) {
    * Get complete
    * @return complete
    **/
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getComplete() {
     return complete;
@@ -228,7 +228,7 @@ public Boolean getComplete() {
   /**
    * Set complete
    */
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/OuterComposite.java
index 2c75587b5b34..df7ad0a9bdc2 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -49,7 +49,7 @@ public class OuterComposite  {
    * Get myNumber
    * @return myNumber
    **/
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getMyNumber() {
     return myNumber;
@@ -58,7 +58,7 @@ public BigDecimal getMyNumber() {
   /**
    * Set myNumber
    */
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -73,7 +73,7 @@ public OuterComposite myNumber(BigDecimal myNumber) {
    * Get myString
    * @return myString
    **/
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getMyString() {
     return myString;
@@ -82,7 +82,7 @@ public String getMyString() {
   /**
    * Set myString
    */
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(String myString) {
     this.myString = myString;
@@ -97,7 +97,7 @@ public OuterComposite myString(String myString) {
    * Get myBoolean
    * @return myBoolean
    **/
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getMyBoolean() {
     return myBoolean;
@@ -106,7 +106,7 @@ public Boolean getMyBoolean() {
   /**
    * Set myBoolean
    */
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 8a297681902f..18980e3daa02 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -39,7 +39,7 @@ public class OuterObjectWithEnumProperty  {
    * Get value
    * @return value
    **/
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public OuterEnumInteger getValue() {
     return value;
@@ -48,7 +48,7 @@ public OuterEnumInteger getValue() {
   /**
    * Set value
    */
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index 657f266e6db5..69ee531af8dc 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -87,7 +87,7 @@ public static TypeEnum fromValue(String value) {
    * Get type
    * @return type
    **/
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public TypeEnum getType() {
     return type;
@@ -96,7 +96,7 @@ public TypeEnum getType() {
   /**
    * Set type
    */
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(TypeEnum type) {
     this.type = type;
@@ -111,7 +111,7 @@ public ParentWithNullable type(TypeEnum type) {
    * Get nullableProperty
    * @return nullableProperty
    **/
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getNullableProperty() {
     return nullableProperty;
@@ -120,7 +120,7 @@ public String getNullableProperty() {
   /**
    * Set nullableProperty
    */
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNullableProperty(String nullableProperty) {
     this.nullableProperty = nullableProperty;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Pet.java
index f53d512ee9c2..aead24076af7 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Pet.java
@@ -106,7 +106,7 @@ public static StatusEnum fromValue(String value) {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -115,7 +115,7 @@ public Long getId() {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -130,7 +130,7 @@ public Pet id(Long id) {
    * Get category
    * @return category
    **/
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Category getCategory() {
     return category;
@@ -139,7 +139,7 @@ public Category getCategory() {
   /**
    * Set category
    */
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(Category category) {
     this.category = category;
@@ -154,7 +154,7 @@ public Pet category(Category category) {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getName() {
     return name;
@@ -163,7 +163,7 @@ public String getName() {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(String name) {
     this.name = name;
@@ -178,7 +178,7 @@ public Pet name(String name) {
    * Get photoUrls
    * @return photoUrls
    **/
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public Set<String> getPhotoUrls() {
     return photoUrls;
@@ -188,7 +188,7 @@ public Set<String> getPhotoUrls() {
    * Set photoUrls
    */
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -211,7 +211,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * Get tags
    * @return tags
    **/
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Tag> getTags() {
     return tags;
@@ -220,7 +220,7 @@ public List<Tag> getTags() {
   /**
    * Set tags
    */
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(List<Tag> tags) {
     this.tags = tags;
@@ -243,7 +243,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * pet status in the store
    * @return status
    **/
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
@@ -252,7 +252,7 @@ public StatusEnum getStatus() {
   /**
    * Set status
    */
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 12380db2a61d..8eb2f10ede5c 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -53,7 +53,7 @@ public ReadOnlyFirst(
    * Get bar
    * @return bar
    **/
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBar() {
     return bar;
@@ -64,7 +64,7 @@ public String getBar() {
    * Get baz
    * @return baz
    **/
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBaz() {
     return baz;
@@ -73,7 +73,7 @@ public String getBaz() {
   /**
    * Set baz
    */
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 36ceec5f5489..2fb7d77a2911 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -39,7 +39,7 @@ public class SpecialModelName  {
    * Get $specialPropertyName
    * @return $specialPropertyName
    **/
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long get$SpecialPropertyName() {
     return $specialPropertyName;
@@ -48,7 +48,7 @@ public class SpecialModelName  {
   /**
    * Set $specialPropertyName
    */
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Tag.java
index b7968d2ea3b6..b1cd63a419a7 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Tag.java
@@ -43,7 +43,7 @@ public class Tag  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -52,7 +52,7 @@ public Long getId() {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -67,7 +67,7 @@ public Tag id(Long id) {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
@@ -76,7 +76,7 @@ public String getName() {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 27445b752c14..c17dd545f9bf 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -41,7 +41,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest extends HashMap<Strin
    * Get someProperty
    * @return someProperty
    **/
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSomeProperty() {
     return someProperty;
@@ -50,7 +50,7 @@ public String getSomeProperty() {
   /**
    * Set someProperty
    */
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/User.java
index 14db71eafc49..01c5da6c1646 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/User.java
@@ -76,7 +76,7 @@ public class User  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -85,7 +85,7 @@ public Long getId() {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -100,7 +100,7 @@ public User id(Long id) {
    * Get username
    * @return username
    **/
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getUsername() {
     return username;
@@ -109,7 +109,7 @@ public String getUsername() {
   /**
    * Set username
    */
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(String username) {
     this.username = username;
@@ -124,7 +124,7 @@ public User username(String username) {
    * Get firstName
    * @return firstName
    **/
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getFirstName() {
     return firstName;
@@ -133,7 +133,7 @@ public String getFirstName() {
   /**
    * Set firstName
    */
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(String firstName) {
     this.firstName = firstName;
@@ -148,7 +148,7 @@ public User firstName(String firstName) {
    * Get lastName
    * @return lastName
    **/
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getLastName() {
     return lastName;
@@ -157,7 +157,7 @@ public String getLastName() {
   /**
    * Set lastName
    */
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(String lastName) {
     this.lastName = lastName;
@@ -172,7 +172,7 @@ public User lastName(String lastName) {
    * Get email
    * @return email
    **/
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getEmail() {
     return email;
@@ -181,7 +181,7 @@ public String getEmail() {
   /**
    * Set email
    */
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(String email) {
     this.email = email;
@@ -196,7 +196,7 @@ public User email(String email) {
    * Get password
    * @return password
    **/
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPassword() {
     return password;
@@ -205,7 +205,7 @@ public String getPassword() {
   /**
    * Set password
    */
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(String password) {
     this.password = password;
@@ -220,7 +220,7 @@ public User password(String password) {
    * Get phone
    * @return phone
    **/
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPhone() {
     return phone;
@@ -229,7 +229,7 @@ public String getPhone() {
   /**
    * Set phone
    */
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(String phone) {
     this.phone = phone;
@@ -244,7 +244,7 @@ public User phone(String phone) {
    * User Status
    * @return userStatus
    **/
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getUserStatus() {
     return userStatus;
@@ -253,7 +253,7 @@ public Integer getUserStatus() {
   /**
    * Set userStatus
    */
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 1e599b532714..d23570638a96 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -102,14 +102,14 @@ public AdditionalPropertiesClass putMapPropertyItem(String key, String mapProper
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, String> getMapProperty() {
     return mapProperty;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -134,14 +134,14 @@ public AdditionalPropertiesClass putMapOfMapPropertyItem(String key, Map<String,
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Map<String, String>> getMapOfMapProperty() {
     return mapOfMapProperty;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
@@ -163,7 +163,7 @@ public Object getAnytype1() {
         return anytype1.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnytype1_JsonNullable() {
@@ -190,14 +190,14 @@ public AdditionalPropertiesClass mapWithUndeclaredPropertiesAnytype1(@javax.anno
    * @return mapWithUndeclaredPropertiesAnytype1
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Object getMapWithUndeclaredPropertiesAnytype1() {
     return mapWithUndeclaredPropertiesAnytype1;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype1(@javax.annotation.Nullable Object mapWithUndeclaredPropertiesAnytype1) {
     this.mapWithUndeclaredPropertiesAnytype1 = mapWithUndeclaredPropertiesAnytype1;
@@ -214,14 +214,14 @@ public AdditionalPropertiesClass mapWithUndeclaredPropertiesAnytype2(@javax.anno
    * @return mapWithUndeclaredPropertiesAnytype2
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Object getMapWithUndeclaredPropertiesAnytype2() {
     return mapWithUndeclaredPropertiesAnytype2;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype2(@javax.annotation.Nullable Object mapWithUndeclaredPropertiesAnytype2) {
     this.mapWithUndeclaredPropertiesAnytype2 = mapWithUndeclaredPropertiesAnytype2;
@@ -246,14 +246,14 @@ public AdditionalPropertiesClass putMapWithUndeclaredPropertiesAnytype3Item(Stri
    * @return mapWithUndeclaredPropertiesAnytype3
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Object> getMapWithUndeclaredPropertiesAnytype3() {
     return mapWithUndeclaredPropertiesAnytype3;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype3(@javax.annotation.Nullable Map<String, Object> mapWithUndeclaredPropertiesAnytype3) {
     this.mapWithUndeclaredPropertiesAnytype3 = mapWithUndeclaredPropertiesAnytype3;
@@ -270,14 +270,14 @@ public AdditionalPropertiesClass emptyMap(@javax.annotation.Nullable Object empt
    * @return emptyMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMPTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_EMPTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Object getEmptyMap() {
     return emptyMap;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMPTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_EMPTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmptyMap(@javax.annotation.Nullable Object emptyMap) {
     this.emptyMap = emptyMap;
@@ -302,14 +302,14 @@ public AdditionalPropertiesClass putMapWithUndeclaredPropertiesStringItem(String
    * @return mapWithUndeclaredPropertiesString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, String> getMapWithUndeclaredPropertiesString() {
     return mapWithUndeclaredPropertiesString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesString(@javax.annotation.Nullable Map<String, String> mapWithUndeclaredPropertiesString) {
     this.mapWithUndeclaredPropertiesString = mapWithUndeclaredPropertiesString;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Animal.java
index 3783966b604b..fd60aae7ef64 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Animal.java
@@ -73,14 +73,14 @@ public Animal className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -97,14 +97,14 @@ public Animal color(@javax.annotation.Nullable String color) {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getColor() {
     return color;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Apple.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Apple.java
index cbc7844c3b3c..abdbea1e5178 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Apple.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Apple.java
@@ -59,14 +59,14 @@ public Apple cultivar(@javax.annotation.Nullable String cultivar) {
    * @return cultivar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getCultivar() {
     return cultivar;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCultivar(@javax.annotation.Nullable String cultivar) {
     this.cultivar = cultivar;
@@ -83,14 +83,14 @@ public Apple origin(@javax.annotation.Nullable String origin) {
    * @return origin
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ORIGIN)
+  @JsonProperty(value = JSON_PROPERTY_ORIGIN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getOrigin() {
     return origin;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ORIGIN)
+  @JsonProperty(value = JSON_PROPERTY_ORIGIN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOrigin(@javax.annotation.Nullable String origin) {
     this.origin = origin;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/AppleReq.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/AppleReq.java
index 12a05a2e8eaf..66256b9d4588 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/AppleReq.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/AppleReq.java
@@ -59,14 +59,14 @@ public AppleReq cultivar(@javax.annotation.Nonnull String cultivar) {
    * @return cultivar
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getCultivar() {
     return cultivar;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setCultivar(@javax.annotation.Nonnull String cultivar) {
     this.cultivar = cultivar;
@@ -83,14 +83,14 @@ public AppleReq mealy(@javax.annotation.Nullable Boolean mealy) {
    * @return mealy
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MEALY)
+  @JsonProperty(value = JSON_PROPERTY_MEALY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getMealy() {
     return mealy;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MEALY)
+  @JsonProperty(value = JSON_PROPERTY_MEALY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMealy(@javax.annotation.Nullable Boolean mealy) {
     this.mealy = mealy;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index d504f8f96d1e..cbd7897dfb90 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -65,14 +65,14 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<List<BigDecimal>> getArrayArrayNumber() {
     return arrayArrayNumber;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 2b1b38834885..df1c0ee1f9f3 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -65,14 +65,14 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<BigDecimal> getArrayNumber() {
     return arrayNumber;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayTest.java
index 66d277bef0ce..34d9d603987f 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -75,14 +75,14 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<String> getArrayOfString() {
     return arrayOfString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -107,14 +107,14 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<List<Long>> getArrayArrayOfInteger() {
     return arrayArrayOfInteger;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -139,14 +139,14 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
     return arrayArrayOfModel;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Banana.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Banana.java
index ff6f5e34dbe1..19a479041b67 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Banana.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Banana.java
@@ -55,14 +55,14 @@ public Banana lengthCm(@javax.annotation.Nullable BigDecimal lengthCm) {
    * @return lengthCm
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getLengthCm() {
     return lengthCm;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLengthCm(@javax.annotation.Nullable BigDecimal lengthCm) {
     this.lengthCm = lengthCm;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/BananaReq.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/BananaReq.java
index 8b014a829ae8..5d6abdfbb210 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/BananaReq.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/BananaReq.java
@@ -60,14 +60,14 @@ public BananaReq lengthCm(@javax.annotation.Nonnull BigDecimal lengthCm) {
    * @return lengthCm
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public BigDecimal getLengthCm() {
     return lengthCm;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setLengthCm(@javax.annotation.Nonnull BigDecimal lengthCm) {
     this.lengthCm = lengthCm;
@@ -84,14 +84,14 @@ public BananaReq sweet(@javax.annotation.Nullable Boolean sweet) {
    * @return sweet
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SWEET)
+  @JsonProperty(value = JSON_PROPERTY_SWEET, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getSweet() {
     return sweet;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SWEET)
+  @JsonProperty(value = JSON_PROPERTY_SWEET, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSweet(@javax.annotation.Nullable Boolean sweet) {
     this.sweet = sweet;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/BasquePig.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/BasquePig.java
index 5c3f9b09330b..3ee654f026b2 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/BasquePig.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/BasquePig.java
@@ -54,14 +54,14 @@ public BasquePig className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Capitalization.java
index 7403a68f6ba0..c022944ca4f1 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -79,14 +79,14 @@ public Capitalization smallCamel(@javax.annotation.Nullable String smallCamel) {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSmallCamel() {
     return smallCamel;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -103,14 +103,14 @@ public Capitalization capitalCamel(@javax.annotation.Nullable String capitalCame
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getCapitalCamel() {
     return capitalCamel;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -127,14 +127,14 @@ public Capitalization smallSnake(@javax.annotation.Nullable String smallSnake) {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSmallSnake() {
     return smallSnake;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -151,14 +151,14 @@ public Capitalization capitalSnake(@javax.annotation.Nullable String capitalSnak
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getCapitalSnake() {
     return capitalSnake;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -175,14 +175,14 @@ public Capitalization scAETHFlowPoints(@javax.annotation.Nullable String scAETHF
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getScAETHFlowPoints() {
     return scAETHFlowPoints;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -199,14 +199,14 @@ public Capitalization ATT_NAME(@javax.annotation.Nullable String ATT_NAME) {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getATTNAME() {
     return ATT_NAME;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Cat.java
index 9078496ae839..f9f4834d970f 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Cat.java
@@ -66,14 +66,14 @@ public Cat declawed(@javax.annotation.Nullable Boolean declawed) {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getDeclawed() {
     return declawed;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Category.java
index eea9d796319f..104fb572ca6c 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Category.java
@@ -59,14 +59,14 @@ public Category id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -83,14 +83,14 @@ public Category name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ChildCat.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ChildCat.java
index 8ed5fa5a8932..0c7ec860dbc1 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ChildCat.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ChildCat.java
@@ -72,14 +72,14 @@ public ChildCat name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
@@ -104,14 +104,14 @@ public ChildCat petType(@javax.annotation.Nullable String petType) {
    * @return petType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPetType() {
     return petType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetType(@javax.annotation.Nullable String petType) {
     if (!PET_TYPE_VALUES.contains(petType)) {
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ClassModel.java
index 451d863bdfa5..5fb4a4ef1b54 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -54,14 +54,14 @@ public ClassModel propertyClass(@javax.annotation.Nullable String propertyClass)
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPropertyClass() {
     return propertyClass;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Client.java
index 1512b5a11568..1381d00bfe7a 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Client.java
@@ -54,14 +54,14 @@ public Client client(@javax.annotation.Nullable String client) {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getClient() {
     return client;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
index d5c05a97a6b8..fa2d375eabc6 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
@@ -59,14 +59,14 @@ public ComplexQuadrilateral shapeType(@javax.annotation.Nonnull String shapeType
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -83,14 +83,14 @@ public ComplexQuadrilateral quadrilateralType(@javax.annotation.Nonnull String q
    * @return quadrilateralType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getQuadrilateralType() {
     return quadrilateralType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@javax.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/DanishPig.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/DanishPig.java
index 4e8f5919f42e..7532dc7a5408 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/DanishPig.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/DanishPig.java
@@ -54,14 +54,14 @@ public DanishPig className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index a6b3730faf10..f4ff53dd9456 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -56,14 +56,14 @@ public DeprecatedObject name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Dog.java
index 1cecd40a8008..069e5d0c721a 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Dog.java
@@ -65,14 +65,14 @@ public Dog breed(@javax.annotation.Nullable String breed) {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBreed() {
     return breed;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Drawing.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Drawing.java
index 1d263ac2bae8..38c7ad54402c 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Drawing.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Drawing.java
@@ -84,14 +84,14 @@ public Drawing mainShape(@javax.annotation.Nullable Shape mainShape) {
    * @return mainShape
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAIN_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_MAIN_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Shape getMainShape() {
     return mainShape;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAIN_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_MAIN_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMainShape(@javax.annotation.Nullable Shape mainShape) {
     this.mainShape = mainShape;
@@ -108,14 +108,14 @@ public Drawing shapeOrNull(@javax.annotation.Nullable ShapeOrNull shapeOrNull) {
    * @return shapeOrNull
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHAPE_OR_NULL)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_OR_NULL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public ShapeOrNull getShapeOrNull() {
     return shapeOrNull;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_OR_NULL)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_OR_NULL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShapeOrNull(@javax.annotation.Nullable ShapeOrNull shapeOrNull) {
     this.shapeOrNull = shapeOrNull;
@@ -137,7 +137,7 @@ public NullableShape getNullableShape() {
         return nullableShape.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<NullableShape> getNullableShape_JsonNullable() {
@@ -172,14 +172,14 @@ public Drawing addShapesItem(Shape shapesItem) {
    * @return shapes
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHAPES)
+  @JsonProperty(value = JSON_PROPERTY_SHAPES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Shape> getShapes() {
     return shapes;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPES)
+  @JsonProperty(value = JSON_PROPERTY_SHAPES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShapes(@javax.annotation.Nullable List<Shape> shapes) {
     this.shapes = shapes;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EnumArrays.java
index 10031364f2a8..0f6401130e12 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -131,14 +131,14 @@ public EnumArrays justSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbo
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public JustSymbolEnum getJustSymbol() {
     return justSymbol;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -163,14 +163,14 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<ArrayEnumEnum> getArrayEnum() {
     return arrayEnum;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EnumTest.java
index 8b704a506001..e0fdfa51bf94 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -280,14 +280,14 @@ public EnumTest enumString(@javax.annotation.Nullable EnumStringEnum enumString)
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumStringEnum getEnumString() {
     return enumString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -304,14 +304,14 @@ public EnumTest enumStringRequired(@javax.annotation.Nonnull EnumStringRequiredE
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public EnumStringRequiredEnum getEnumStringRequired() {
     return enumStringRequired;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -328,14 +328,14 @@ public EnumTest enumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteg
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumIntegerEnum getEnumInteger() {
     return enumInteger;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -352,14 +352,14 @@ public EnumTest enumIntegerOnly(@javax.annotation.Nullable EnumIntegerOnlyEnum e
    * @return enumIntegerOnly
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER_ONLY)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER_ONLY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumIntegerOnlyEnum getEnumIntegerOnly() {
     return enumIntegerOnly;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER_ONLY)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER_ONLY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumIntegerOnly(@javax.annotation.Nullable EnumIntegerOnlyEnum enumIntegerOnly) {
     this.enumIntegerOnly = enumIntegerOnly;
@@ -376,14 +376,14 @@ public EnumTest enumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber)
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumNumberEnum getEnumNumber() {
     return enumNumber;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -405,7 +405,7 @@ public OuterEnum getOuterEnum() {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -432,14 +432,14 @@ public EnumTest outerEnumInteger(@javax.annotation.Nullable OuterEnumInteger out
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OuterEnumInteger getOuterEnumInteger() {
     return outerEnumInteger;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -456,14 +456,14 @@ public EnumTest outerEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaul
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
     return outerEnumDefaultValue;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -480,14 +480,14 @@ public EnumTest outerEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnu
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
     return outerEnumIntegerDefaultValue;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EquilateralTriangle.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
index ac0a016d0aea..b590da26ec44 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
@@ -59,14 +59,14 @@ public EquilateralTriangle shapeType(@javax.annotation.Nonnull String shapeType)
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -83,14 +83,14 @@ public EquilateralTriangle triangleType(@javax.annotation.Nonnull String triangl
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getTriangleType() {
     return triangleType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 5b4577092754..17c9fc191ba7 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -62,14 +62,14 @@ public FakeBigDecimalMap200Response someId(@javax.annotation.Nullable BigDecimal
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getSomeId() {
     return someId;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -94,14 +94,14 @@ public FakeBigDecimalMap200Response putSomeMapItem(String key, BigDecimal someMa
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, BigDecimal> getSomeMap() {
     return someMap;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 31c62cdd7287..b09369fb7ce4 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -62,14 +62,14 @@ public FileSchemaTestClass _file(@javax.annotation.Nullable ModelFile _file) {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public ModelFile getFile() {
     return _file;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -94,14 +94,14 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<ModelFile> getFiles() {
     return files;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Foo.java
index a09e3849c52c..2eaafd4631e4 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Foo.java
@@ -54,14 +54,14 @@ public Foo bar(@javax.annotation.Nullable String bar) {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBar() {
     return bar;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 8c0facd8753b..22f7c1d5d7d1 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -55,14 +55,14 @@ public FooGetDefaultResponse string(@javax.annotation.Nullable Foo string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Foo getString() {
     return string;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FormatTest.java
index de1723c7001a..37ecf09d42c1 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -136,14 +136,14 @@ public FormatTest integer(@javax.annotation.Nullable Integer integer) {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getInteger() {
     return integer;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -162,14 +162,14 @@ public FormatTest int32(@javax.annotation.Nullable Integer int32) {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getInt32() {
     return int32;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -186,14 +186,14 @@ public FormatTest int64(@javax.annotation.Nullable Long int64) {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getInt64() {
     return int64;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -212,14 +212,14 @@ public FormatTest number(@javax.annotation.Nonnull BigDecimal number) {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public BigDecimal getNumber() {
     return number;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -238,14 +238,14 @@ public FormatTest _float(@javax.annotation.Nullable Float _float) {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Float getFloat() {
     return _float;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -264,14 +264,14 @@ public FormatTest _double(@javax.annotation.Nullable Double _double) {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Double getDouble() {
     return _double;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -288,14 +288,14 @@ public FormatTest decimal(@javax.annotation.Nullable BigDecimal decimal) {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getDecimal() {
     return decimal;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -312,14 +312,14 @@ public FormatTest string(@javax.annotation.Nullable String string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getString() {
     return string;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -336,14 +336,14 @@ public FormatTest _byte(@javax.annotation.Nonnull byte[] _byte) {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public byte[] getByte() {
     return _byte;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -360,14 +360,14 @@ public FormatTest binary(@javax.annotation.Nullable File binary) {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public File getBinary() {
     return binary;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -384,14 +384,14 @@ public FormatTest date(@javax.annotation.Nonnull LocalDate date) {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public LocalDate getDate() {
     return date;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -408,14 +408,14 @@ public FormatTest dateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OffsetDateTime getDateTime() {
     return dateTime;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -432,14 +432,14 @@ public FormatTest uuid(@javax.annotation.Nullable UUID uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public UUID getUuid() {
     return uuid;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -456,14 +456,14 @@ public FormatTest password(@javax.annotation.Nonnull String password) {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getPassword() {
     return password;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -480,14 +480,14 @@ public FormatTest patternWithDigits(@javax.annotation.Nullable String patternWit
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPatternWithDigits() {
     return patternWithDigits;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -504,14 +504,14 @@ public FormatTest patternWithDigitsAndDelimiter(@javax.annotation.Nullable Strin
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPatternWithDigitsAndDelimiter() {
     return patternWithDigitsAndDelimiter;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/GrandparentAnimal.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
index 931d8bb0447d..036633558056 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
@@ -68,14 +68,14 @@ public GrandparentAnimal petType(@javax.annotation.Nonnull String petType) {
    * @return petType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getPetType() {
     return petType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPetType(@javax.annotation.Nonnull String petType) {
     this.petType = petType;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index e2aa3cac46c3..d3d44bb7fdb2 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -64,7 +64,7 @@ public HasOnlyReadOnly(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBar() {
     return bar;
@@ -78,7 +78,7 @@ public String getBar() {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getFoo() {
     return foo;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 6b7d959040f2..216b4bdd97c4 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -62,7 +62,7 @@ public String getNullableMessage() {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
index d738de96fbe5..82ac5a02e37c 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
@@ -59,14 +59,14 @@ public IsoscelesTriangle shapeType(@javax.annotation.Nonnull String shapeType) {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -83,14 +83,14 @@ public IsoscelesTriangle triangleType(@javax.annotation.Nonnull String triangleT
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getTriangleType() {
     return triangleType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/MapTest.java
index 7839a46a1be8..ef0822c56eae 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/MapTest.java
@@ -114,14 +114,14 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Map<String, String>> getMapMapOfString() {
     return mapMapOfString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -146,14 +146,14 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, InnerEnum> getMapOfEnumString() {
     return mapOfEnumString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -178,14 +178,14 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Boolean> getDirectMap() {
     return directMap;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -210,14 +210,14 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Boolean> getIndirectMap() {
     return indirectMap;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index bb6296af1807..2ac43a0dc902 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -69,14 +69,14 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@javax.annotation.Nullab
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public UUID getUuid() {
     return uuid;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -93,14 +93,14 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@javax.annotation.Nu
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OffsetDateTime getDateTime() {
     return dateTime;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -125,14 +125,14 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Animal> getMap() {
     return map;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Model200Response.java
index 97bc402c47bd..6fad88b9b323 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -59,14 +59,14 @@ public Model200Response name(@javax.annotation.Nullable Integer name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -83,14 +83,14 @@ public Model200Response propertyClass(@javax.annotation.Nullable String property
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPropertyClass() {
     return propertyClass;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index c918cab6bb4f..f58443a997bb 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -64,14 +64,14 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getCode() {
     return code;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -88,14 +88,14 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getType() {
     return type;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -112,14 +112,14 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getMessage() {
     return message;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelFile.java
index 4a19e50fca83..2f7d82af8172 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -54,14 +54,14 @@ public ModelFile sourceURI(@javax.annotation.Nullable String sourceURI) {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSourceURI() {
     return sourceURI;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelList.java
index 239e703d06ab..fda9907db102 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelList.java
@@ -54,14 +54,14 @@ public ModelList _123list(@javax.annotation.Nullable String _123list) {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String get123list() {
     return _123list;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelReturn.java
index 4829066a7958..5372f0cfc96a 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -54,14 +54,14 @@ public ModelReturn _return(@javax.annotation.Nullable Integer _return) {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getReturn() {
     return _return;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Name.java
index 66525a496d15..6debc78299c3 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Name.java
@@ -79,14 +79,14 @@ public Name name(@javax.annotation.Nonnull Integer name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public Integer getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -98,7 +98,7 @@ public void setName(@javax.annotation.Nonnull Integer name) {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getSnakeCase() {
     return snakeCase;
@@ -117,14 +117,14 @@ public Name property(@javax.annotation.Nullable String property) {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getProperty() {
     return property;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -136,7 +136,7 @@ public void setProperty(@javax.annotation.Nullable String property) {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer get123number() {
     return _123number;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/NullableClass.java
index 2f622a6a830a..2c549f1f512d 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -119,7 +119,7 @@ public Integer getIntegerProp() {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -151,7 +151,7 @@ public BigDecimal getNumberProp() {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -183,7 +183,7 @@ public Boolean getBooleanProp() {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -215,7 +215,7 @@ public String getStringProp() {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -247,7 +247,7 @@ public LocalDate getDateProp() {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -279,7 +279,7 @@ public OffsetDateTime getDatetimeProp() {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -323,7 +323,7 @@ public List<Object> getArrayNullableProp() {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -367,7 +367,7 @@ public List<Object> getArrayAndItemsNullableProp() {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -402,14 +402,14 @@ public NullableClass addArrayItemsNullableItem(Object arrayItemsNullableItem) {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Object> getArrayItemsNullable() {
     return arrayItemsNullable;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -443,7 +443,7 @@ public Map<String, Object> getObjectNullableProp() {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -487,7 +487,7 @@ public Map<String, Object> getObjectAndItemsNullableProp() {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -522,14 +522,14 @@ public NullableClass putObjectItemsNullableItem(String key, Object objectItemsNu
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Object> getObjectItemsNullable() {
     return objectItemsNullable;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/NumberOnly.java
index 9f4a6c45cfdf..fc6f8b5d763a 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -55,14 +55,14 @@ public NumberOnly justNumber(@javax.annotation.Nullable BigDecimal justNumber) {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getJustNumber() {
     return justNumber;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index a1b3074e4291..32cff4c94383 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -73,14 +73,14 @@ public ObjectWithDeprecatedFields uuid(@javax.annotation.Nullable String uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getUuid() {
     return uuid;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -99,14 +99,14 @@ public ObjectWithDeprecatedFields id(@javax.annotation.Nullable BigDecimal id) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -125,14 +125,14 @@ public ObjectWithDeprecatedFields deprecatedRef(@javax.annotation.Nullable Depre
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public DeprecatedObject getDeprecatedRef() {
     return deprecatedRef;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -159,14 +159,14 @@ public ObjectWithDeprecatedFields addBarsItem(String barsItem) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<String> getBars() {
     return bars;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Order.java
index 155ea285634f..12fecb624acf 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Order.java
@@ -117,14 +117,14 @@ public Order id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -141,14 +141,14 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getPetId() {
     return petId;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -165,14 +165,14 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getQuantity() {
     return quantity;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -189,14 +189,14 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OffsetDateTime getShipDate() {
     return shipDate;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -213,14 +213,14 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -237,14 +237,14 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getComplete() {
     return complete;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/OuterComposite.java
index c969dea17b9a..e94ef8f1de66 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -65,14 +65,14 @@ public OuterComposite myNumber(@javax.annotation.Nullable BigDecimal myNumber) {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getMyNumber() {
     return myNumber;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -89,14 +89,14 @@ public OuterComposite myString(@javax.annotation.Nullable String myString) {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getMyString() {
     return myString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -113,14 +113,14 @@ public OuterComposite myBoolean(@javax.annotation.Nullable Boolean myBoolean) {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getMyBoolean() {
     return myBoolean;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Pet.java
index b38d39b23379..61ba97b1d10b 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,14 +120,14 @@ public Pet id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -144,14 +144,14 @@ public Pet category(@javax.annotation.Nullable Category category) {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Category getCategory() {
     return category;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -168,14 +168,14 @@ public Pet name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -200,14 +200,14 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public List<String> getPhotoUrls() {
     return photoUrls;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -232,14 +232,14 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Tag> getTags() {
     return tags;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -256,14 +256,14 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
index 065fba773da4..bb7daf4b0ffe 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
@@ -54,14 +54,14 @@ public QuadrilateralInterface quadrilateralType(@javax.annotation.Nonnull String
    * @return quadrilateralType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getQuadrilateralType() {
     return quadrilateralType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@javax.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 47031055d832..59189bcb5fea 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -62,7 +62,7 @@ public ReadOnlyFirst(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBar() {
     return bar;
@@ -81,14 +81,14 @@ public ReadOnlyFirst baz(@javax.annotation.Nullable String baz) {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBaz() {
     return baz;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ScaleneTriangle.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
index cc6be1b0d137..8da0a50952cd 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
@@ -59,14 +59,14 @@ public ScaleneTriangle shapeType(@javax.annotation.Nonnull String shapeType) {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -83,14 +83,14 @@ public ScaleneTriangle triangleType(@javax.annotation.Nonnull String triangleTyp
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getTriangleType() {
     return triangleType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ShapeInterface.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ShapeInterface.java
index fb6055603498..daa533eda4cf 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ShapeInterface.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ShapeInterface.java
@@ -54,14 +54,14 @@ public ShapeInterface shapeType(@javax.annotation.Nonnull String shapeType) {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
index 80191829c432..bc068a43b1da 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
@@ -59,14 +59,14 @@ public SimpleQuadrilateral shapeType(@javax.annotation.Nonnull String shapeType)
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -83,14 +83,14 @@ public SimpleQuadrilateral quadrilateralType(@javax.annotation.Nonnull String qu
    * @return quadrilateralType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getQuadrilateralType() {
     return quadrilateralType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@javax.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/SpecialModelName.java
index b6fa732c1da1..85fd5ace318f 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -59,14 +59,14 @@ public SpecialModelName() {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long get$SpecialPropertyName() {
     return $specialPropertyName;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
@@ -83,14 +83,14 @@ public SpecialModelName specialModelName(@javax.annotation.Nullable String speci
    * @return specialModelName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SPECIAL_MODEL_NAME)
+  @JsonProperty(value = JSON_PROPERTY_SPECIAL_MODEL_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSpecialModelName() {
     return specialModelName;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SPECIAL_MODEL_NAME)
+  @JsonProperty(value = JSON_PROPERTY_SPECIAL_MODEL_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSpecialModelName(@javax.annotation.Nullable String specialModelName) {
     this.specialModelName = specialModelName;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Tag.java
index 5c91186abf0c..078d3cb8fd15 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Tag.java
@@ -59,14 +59,14 @@ public Tag id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -83,14 +83,14 @@ public Tag name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 0233d93e9bc7..508f5f706ba8 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -60,14 +60,14 @@ public TestInlineFreeformAdditionalPropertiesRequest someProperty(@javax.annotat
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSomeProperty() {
     return someProperty;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/TriangleInterface.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/TriangleInterface.java
index f0def5f75312..8f678ada63f5 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/TriangleInterface.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/TriangleInterface.java
@@ -54,14 +54,14 @@ public TriangleInterface triangleType(@javax.annotation.Nonnull String triangleT
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getTriangleType() {
     return triangleType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/User.java
index 794dcaa5f978..65ce875ca8cb 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/User.java
@@ -110,14 +110,14 @@ public User id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -134,14 +134,14 @@ public User username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getUsername() {
     return username;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -158,14 +158,14 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getFirstName() {
     return firstName;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -182,14 +182,14 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getLastName() {
     return lastName;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -206,14 +206,14 @@ public User email(@javax.annotation.Nullable String email) {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getEmail() {
     return email;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -230,14 +230,14 @@ public User password(@javax.annotation.Nullable String password) {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPassword() {
     return password;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -254,14 +254,14 @@ public User phone(@javax.annotation.Nullable String phone) {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPhone() {
     return phone;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -278,14 +278,14 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getUserStatus() {
     return userStatus;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
@@ -302,14 +302,14 @@ public User objectWithNoDeclaredProps(@javax.annotation.Nullable Object objectWi
    * @return objectWithNoDeclaredProps
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Object getObjectWithNoDeclaredProps() {
     return objectWithNoDeclaredProps;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectWithNoDeclaredProps(@javax.annotation.Nullable Object objectWithNoDeclaredProps) {
     this.objectWithNoDeclaredProps = objectWithNoDeclaredProps;
@@ -331,7 +331,7 @@ public Object getObjectWithNoDeclaredPropsNullable() {
         return objectWithNoDeclaredPropsNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getObjectWithNoDeclaredPropsNullable_JsonNullable() {
@@ -363,7 +363,7 @@ public Object getAnyTypeProp() {
         return anyTypeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANY_TYPE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ANY_TYPE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnyTypeProp_JsonNullable() {
@@ -395,7 +395,7 @@ public Object getAnyTypePropNullable() {
         return anyTypePropNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANY_TYPE_PROP_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ANY_TYPE_PROP_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnyTypePropNullable_JsonNullable() {
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Whale.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Whale.java
index f842259ed5b3..bd23bcc672ce 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Whale.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Whale.java
@@ -64,14 +64,14 @@ public Whale hasBaleen(@javax.annotation.Nullable Boolean hasBaleen) {
    * @return hasBaleen
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_HAS_BALEEN)
+  @JsonProperty(value = JSON_PROPERTY_HAS_BALEEN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getHasBaleen() {
     return hasBaleen;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_HAS_BALEEN)
+  @JsonProperty(value = JSON_PROPERTY_HAS_BALEEN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setHasBaleen(@javax.annotation.Nullable Boolean hasBaleen) {
     this.hasBaleen = hasBaleen;
@@ -88,14 +88,14 @@ public Whale hasTeeth(@javax.annotation.Nullable Boolean hasTeeth) {
    * @return hasTeeth
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_HAS_TEETH)
+  @JsonProperty(value = JSON_PROPERTY_HAS_TEETH, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getHasTeeth() {
     return hasTeeth;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_HAS_TEETH)
+  @JsonProperty(value = JSON_PROPERTY_HAS_TEETH, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setHasTeeth(@javax.annotation.Nullable Boolean hasTeeth) {
     this.hasTeeth = hasTeeth;
@@ -112,14 +112,14 @@ public Whale className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Zebra.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Zebra.java
index d52025677f0b..411e01101126 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Zebra.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Zebra.java
@@ -102,14 +102,14 @@ public Zebra type(@javax.annotation.Nullable TypeEnum type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public TypeEnum getType() {
     return type;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -126,14 +126,14 @@ public Zebra className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Category.java
index 8d89df6866a5..c3f06e6efe3e 100644
--- a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Category.java
@@ -59,14 +59,14 @@ public Category id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -83,14 +83,14 @@ public Category name(@jakarta.annotation.Nullable String name) {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 47fcf7987697..a395a57a737f 100644
--- a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -64,14 +64,14 @@ public ModelApiResponse code(@jakarta.annotation.Nullable Integer code) {
    * @return code
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getCode() {
     return code;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@jakarta.annotation.Nullable Integer code) {
     this.code = code;
@@ -88,14 +88,14 @@ public ModelApiResponse type(@jakarta.annotation.Nullable String type) {
    * @return type
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getType() {
     return type;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable String type) {
     this.type = type;
@@ -112,14 +112,14 @@ public ModelApiResponse message(@jakarta.annotation.Nullable String message) {
    * @return message
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getMessage() {
     return message;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@jakarta.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Order.java
index 63108cf78894..c827e6db9956 100644
--- a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Order.java
@@ -117,14 +117,14 @@ public Order id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -141,14 +141,14 @@ public Order petId(@jakarta.annotation.Nullable Long petId) {
    * @return petId
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getPetId() {
     return petId;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@jakarta.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -165,14 +165,14 @@ public Order quantity(@jakarta.annotation.Nullable Integer quantity) {
    * @return quantity
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getQuantity() {
     return quantity;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@jakarta.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -189,14 +189,14 @@ public Order shipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
    * @return shipDate
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OffsetDateTime getShipDate() {
     return shipDate;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -213,14 +213,14 @@ public Order status(@jakarta.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -237,14 +237,14 @@ public Order complete(@jakarta.annotation.Nullable Boolean complete) {
    * @return complete
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getComplete() {
     return complete;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@jakarta.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Pet.java
index f6d37e54532b..95c09760dd31 100644
--- a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,14 +120,14 @@ public Pet id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -144,14 +144,14 @@ public Pet category(@jakarta.annotation.Nullable Category category) {
    * @return category
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Category getCategory() {
     return category;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@jakarta.annotation.Nullable Category category) {
     this.category = category;
@@ -168,14 +168,14 @@ public Pet name(@jakarta.annotation.Nonnull String name) {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
@@ -200,14 +200,14 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public List<String> getPhotoUrls() {
     return photoUrls;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@jakarta.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -232,14 +232,14 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Tag> getTags() {
     return tags;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@jakarta.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -258,14 +258,14 @@ public Pet status(@jakarta.annotation.Nullable StatusEnum status) {
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Tag.java
index fb1de24c04a8..9b9f6209c15c 100644
--- a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Tag.java
@@ -59,14 +59,14 @@ public Tag id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -83,14 +83,14 @@ public Tag name(@jakarta.annotation.Nullable String name) {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/User.java
index 9fb1ed2b46e1..19696bf575ab 100644
--- a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/User.java
@@ -89,14 +89,14 @@ public User id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -113,14 +113,14 @@ public User username(@jakarta.annotation.Nullable String username) {
    * @return username
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getUsername() {
     return username;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -137,14 +137,14 @@ public User firstName(@jakarta.annotation.Nullable String firstName) {
    * @return firstName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getFirstName() {
     return firstName;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@jakarta.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -161,14 +161,14 @@ public User lastName(@jakarta.annotation.Nullable String lastName) {
    * @return lastName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getLastName() {
     return lastName;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@jakarta.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -185,14 +185,14 @@ public User email(@jakarta.annotation.Nullable String email) {
    * @return email
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getEmail() {
     return email;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@jakarta.annotation.Nullable String email) {
     this.email = email;
@@ -209,14 +209,14 @@ public User password(@jakarta.annotation.Nullable String password) {
    * @return password
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPassword() {
     return password;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@jakarta.annotation.Nullable String password) {
     this.password = password;
@@ -233,14 +233,14 @@ public User phone(@jakarta.annotation.Nullable String phone) {
    * @return phone
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPhone() {
     return phone;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@jakarta.annotation.Nullable String phone) {
     this.phone = phone;
@@ -257,14 +257,14 @@ public User userStatus(@jakarta.annotation.Nullable Integer userStatus) {
    * @return userStatus
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getUserStatus() {
     return userStatus;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@jakarta.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 49f661c4ef24..22eeaf9a7578 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -104,14 +104,14 @@ public AdditionalPropertiesClass putMapPropertyItem(String key, String mapProper
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, String> getMapProperty() {
     return mapProperty;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -136,14 +136,14 @@ public AdditionalPropertiesClass putMapOfMapPropertyItem(String key, Map<String,
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Map<String, String>> getMapOfMapProperty() {
     return mapOfMapProperty;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
@@ -165,7 +165,7 @@ public Object getAnytype1() {
         return anytype1.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnytype1_JsonNullable() {
@@ -192,14 +192,14 @@ public AdditionalPropertiesClass mapWithUndeclaredPropertiesAnytype1(@javax.anno
    * @return mapWithUndeclaredPropertiesAnytype1
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Object getMapWithUndeclaredPropertiesAnytype1() {
     return mapWithUndeclaredPropertiesAnytype1;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype1(@javax.annotation.Nullable Object mapWithUndeclaredPropertiesAnytype1) {
     this.mapWithUndeclaredPropertiesAnytype1 = mapWithUndeclaredPropertiesAnytype1;
@@ -216,14 +216,14 @@ public AdditionalPropertiesClass mapWithUndeclaredPropertiesAnytype2(@javax.anno
    * @return mapWithUndeclaredPropertiesAnytype2
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Object getMapWithUndeclaredPropertiesAnytype2() {
     return mapWithUndeclaredPropertiesAnytype2;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype2(@javax.annotation.Nullable Object mapWithUndeclaredPropertiesAnytype2) {
     this.mapWithUndeclaredPropertiesAnytype2 = mapWithUndeclaredPropertiesAnytype2;
@@ -248,14 +248,14 @@ public AdditionalPropertiesClass putMapWithUndeclaredPropertiesAnytype3Item(Stri
    * @return mapWithUndeclaredPropertiesAnytype3
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Object> getMapWithUndeclaredPropertiesAnytype3() {
     return mapWithUndeclaredPropertiesAnytype3;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype3(@javax.annotation.Nullable Map<String, Object> mapWithUndeclaredPropertiesAnytype3) {
     this.mapWithUndeclaredPropertiesAnytype3 = mapWithUndeclaredPropertiesAnytype3;
@@ -272,14 +272,14 @@ public AdditionalPropertiesClass emptyMap(@javax.annotation.Nullable Object empt
    * @return emptyMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMPTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_EMPTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Object getEmptyMap() {
     return emptyMap;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMPTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_EMPTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmptyMap(@javax.annotation.Nullable Object emptyMap) {
     this.emptyMap = emptyMap;
@@ -304,14 +304,14 @@ public AdditionalPropertiesClass putMapWithUndeclaredPropertiesStringItem(String
    * @return mapWithUndeclaredPropertiesString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, String> getMapWithUndeclaredPropertiesString() {
     return mapWithUndeclaredPropertiesString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesString(@javax.annotation.Nullable Map<String, String> mapWithUndeclaredPropertiesString) {
     this.mapWithUndeclaredPropertiesString = mapWithUndeclaredPropertiesString;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Animal.java
index cd1ec8a4a484..e45b71130f3c 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Animal.java
@@ -75,14 +75,14 @@ public Animal className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -99,14 +99,14 @@ public Animal color(@javax.annotation.Nullable String color) {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getColor() {
     return color;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Apple.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Apple.java
index 5c4c6ed03dfa..c2a3676c8f68 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Apple.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Apple.java
@@ -61,14 +61,14 @@ public Apple cultivar(@javax.annotation.Nullable String cultivar) {
    * @return cultivar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getCultivar() {
     return cultivar;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCultivar(@javax.annotation.Nullable String cultivar) {
     this.cultivar = cultivar;
@@ -85,14 +85,14 @@ public Apple origin(@javax.annotation.Nullable String origin) {
    * @return origin
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ORIGIN)
+  @JsonProperty(value = JSON_PROPERTY_ORIGIN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getOrigin() {
     return origin;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ORIGIN)
+  @JsonProperty(value = JSON_PROPERTY_ORIGIN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOrigin(@javax.annotation.Nullable String origin) {
     this.origin = origin;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/AppleReq.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/AppleReq.java
index b6eb00b757f5..6c87384b2ca9 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/AppleReq.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/AppleReq.java
@@ -61,14 +61,14 @@ public AppleReq cultivar(@javax.annotation.Nonnull String cultivar) {
    * @return cultivar
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getCultivar() {
     return cultivar;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setCultivar(@javax.annotation.Nonnull String cultivar) {
     this.cultivar = cultivar;
@@ -85,14 +85,14 @@ public AppleReq mealy(@javax.annotation.Nullable Boolean mealy) {
    * @return mealy
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MEALY)
+  @JsonProperty(value = JSON_PROPERTY_MEALY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getMealy() {
     return mealy;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MEALY)
+  @JsonProperty(value = JSON_PROPERTY_MEALY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMealy(@javax.annotation.Nullable Boolean mealy) {
     this.mealy = mealy;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 14b7620863f8..9b0b8be828f4 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -67,14 +67,14 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<List<BigDecimal>> getArrayArrayNumber() {
     return arrayArrayNumber;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 43edb1b8bf8a..97b355b58990 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -67,14 +67,14 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<BigDecimal> getArrayNumber() {
     return arrayNumber;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayTest.java
index 34cf747c2d46..c66a84c35a07 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -77,14 +77,14 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<String> getArrayOfString() {
     return arrayOfString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -109,14 +109,14 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<List<Long>> getArrayArrayOfInteger() {
     return arrayArrayOfInteger;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -141,14 +141,14 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
     return arrayArrayOfModel;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Banana.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Banana.java
index 41fea114560c..2ef39d87bdc9 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Banana.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Banana.java
@@ -57,14 +57,14 @@ public Banana lengthCm(@javax.annotation.Nullable BigDecimal lengthCm) {
    * @return lengthCm
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getLengthCm() {
     return lengthCm;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLengthCm(@javax.annotation.Nullable BigDecimal lengthCm) {
     this.lengthCm = lengthCm;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/BananaReq.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/BananaReq.java
index 2eac6472e4f6..66159756d0f6 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/BananaReq.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/BananaReq.java
@@ -62,14 +62,14 @@ public BananaReq lengthCm(@javax.annotation.Nonnull BigDecimal lengthCm) {
    * @return lengthCm
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public BigDecimal getLengthCm() {
     return lengthCm;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setLengthCm(@javax.annotation.Nonnull BigDecimal lengthCm) {
     this.lengthCm = lengthCm;
@@ -86,14 +86,14 @@ public BananaReq sweet(@javax.annotation.Nullable Boolean sweet) {
    * @return sweet
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SWEET)
+  @JsonProperty(value = JSON_PROPERTY_SWEET, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getSweet() {
     return sweet;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SWEET)
+  @JsonProperty(value = JSON_PROPERTY_SWEET, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSweet(@javax.annotation.Nullable Boolean sweet) {
     this.sweet = sweet;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/BasquePig.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/BasquePig.java
index 6bb38b297f8e..006740649100 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/BasquePig.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/BasquePig.java
@@ -56,14 +56,14 @@ public BasquePig className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Capitalization.java
index 6fa476a244dc..d3df708b7381 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -81,14 +81,14 @@ public Capitalization smallCamel(@javax.annotation.Nullable String smallCamel) {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSmallCamel() {
     return smallCamel;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -105,14 +105,14 @@ public Capitalization capitalCamel(@javax.annotation.Nullable String capitalCame
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getCapitalCamel() {
     return capitalCamel;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -129,14 +129,14 @@ public Capitalization smallSnake(@javax.annotation.Nullable String smallSnake) {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSmallSnake() {
     return smallSnake;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -153,14 +153,14 @@ public Capitalization capitalSnake(@javax.annotation.Nullable String capitalSnak
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getCapitalSnake() {
     return capitalSnake;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -177,14 +177,14 @@ public Capitalization scAETHFlowPoints(@javax.annotation.Nullable String scAETHF
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getScAETHFlowPoints() {
     return scAETHFlowPoints;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -201,14 +201,14 @@ public Capitalization ATT_NAME(@javax.annotation.Nullable String ATT_NAME) {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getATTNAME() {
     return ATT_NAME;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Cat.java
index c0524f8e92eb..5581cc6df769 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Cat.java
@@ -68,14 +68,14 @@ public Cat declawed(@javax.annotation.Nullable Boolean declawed) {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getDeclawed() {
     return declawed;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Category.java
index 8d118b3e824d..178a5ede9109 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Category.java
@@ -61,14 +61,14 @@ public Category id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -85,14 +85,14 @@ public Category name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ChildCat.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ChildCat.java
index a2afbae31ba7..0e410465a291 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ChildCat.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ChildCat.java
@@ -74,14 +74,14 @@ public ChildCat name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
@@ -106,14 +106,14 @@ public ChildCat petType(@javax.annotation.Nullable String petType) {
    * @return petType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPetType() {
     return petType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetType(@javax.annotation.Nullable String petType) {
     if (!PET_TYPE_VALUES.contains(petType)) {
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ClassModel.java
index 32b0f2a8b3e2..d7780df6516b 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -56,14 +56,14 @@ public ClassModel propertyClass(@javax.annotation.Nullable String propertyClass)
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPropertyClass() {
     return propertyClass;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Client.java
index 09d797b04470..e109db49d4a8 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Client.java
@@ -56,14 +56,14 @@ public Client client(@javax.annotation.Nullable String client) {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getClient() {
     return client;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
index 81e6650477b1..e34bb045ebab 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
@@ -61,14 +61,14 @@ public ComplexQuadrilateral shapeType(@javax.annotation.Nonnull String shapeType
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -85,14 +85,14 @@ public ComplexQuadrilateral quadrilateralType(@javax.annotation.Nonnull String q
    * @return quadrilateralType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getQuadrilateralType() {
     return quadrilateralType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@javax.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/DanishPig.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/DanishPig.java
index fa2efe1fa9a0..0d54335d9dec 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/DanishPig.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/DanishPig.java
@@ -56,14 +56,14 @@ public DanishPig className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index a5960b43eb9e..2b16ac78749b 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -58,14 +58,14 @@ public DeprecatedObject name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Dog.java
index 3ac4e5f3afbd..d27f3050d634 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Dog.java
@@ -67,14 +67,14 @@ public Dog breed(@javax.annotation.Nullable String breed) {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBreed() {
     return breed;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Drawing.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Drawing.java
index 4e635940328e..bf71bf6e70e8 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Drawing.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Drawing.java
@@ -86,14 +86,14 @@ public Drawing mainShape(@javax.annotation.Nullable Shape mainShape) {
    * @return mainShape
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAIN_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_MAIN_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Shape getMainShape() {
     return mainShape;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAIN_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_MAIN_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMainShape(@javax.annotation.Nullable Shape mainShape) {
     this.mainShape = mainShape;
@@ -110,14 +110,14 @@ public Drawing shapeOrNull(@javax.annotation.Nullable ShapeOrNull shapeOrNull) {
    * @return shapeOrNull
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHAPE_OR_NULL)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_OR_NULL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public ShapeOrNull getShapeOrNull() {
     return shapeOrNull;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_OR_NULL)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_OR_NULL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShapeOrNull(@javax.annotation.Nullable ShapeOrNull shapeOrNull) {
     this.shapeOrNull = shapeOrNull;
@@ -139,7 +139,7 @@ public NullableShape getNullableShape() {
         return nullableShape.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<NullableShape> getNullableShape_JsonNullable() {
@@ -174,14 +174,14 @@ public Drawing addShapesItem(Shape shapesItem) {
    * @return shapes
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHAPES)
+  @JsonProperty(value = JSON_PROPERTY_SHAPES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Shape> getShapes() {
     return shapes;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPES)
+  @JsonProperty(value = JSON_PROPERTY_SHAPES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShapes(@javax.annotation.Nullable List<Shape> shapes) {
     this.shapes = shapes;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EnumArrays.java
index 689a3c68d1fb..082f172a1227 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -133,14 +133,14 @@ public EnumArrays justSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbo
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public JustSymbolEnum getJustSymbol() {
     return justSymbol;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -165,14 +165,14 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<ArrayEnumEnum> getArrayEnum() {
     return arrayEnum;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EnumTest.java
index 3f7026b60d94..e5fb788d1df0 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -282,14 +282,14 @@ public EnumTest enumString(@javax.annotation.Nullable EnumStringEnum enumString)
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumStringEnum getEnumString() {
     return enumString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -306,14 +306,14 @@ public EnumTest enumStringRequired(@javax.annotation.Nonnull EnumStringRequiredE
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public EnumStringRequiredEnum getEnumStringRequired() {
     return enumStringRequired;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -330,14 +330,14 @@ public EnumTest enumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteg
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumIntegerEnum getEnumInteger() {
     return enumInteger;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -354,14 +354,14 @@ public EnumTest enumIntegerOnly(@javax.annotation.Nullable EnumIntegerOnlyEnum e
    * @return enumIntegerOnly
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER_ONLY)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER_ONLY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumIntegerOnlyEnum getEnumIntegerOnly() {
     return enumIntegerOnly;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER_ONLY)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER_ONLY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumIntegerOnly(@javax.annotation.Nullable EnumIntegerOnlyEnum enumIntegerOnly) {
     this.enumIntegerOnly = enumIntegerOnly;
@@ -378,14 +378,14 @@ public EnumTest enumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber)
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumNumberEnum getEnumNumber() {
     return enumNumber;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -407,7 +407,7 @@ public OuterEnum getOuterEnum() {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -434,14 +434,14 @@ public EnumTest outerEnumInteger(@javax.annotation.Nullable OuterEnumInteger out
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OuterEnumInteger getOuterEnumInteger() {
     return outerEnumInteger;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -458,14 +458,14 @@ public EnumTest outerEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaul
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
     return outerEnumDefaultValue;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -482,14 +482,14 @@ public EnumTest outerEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnu
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
     return outerEnumIntegerDefaultValue;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EquilateralTriangle.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
index 770ce763aa7a..ee4ff2999cd5 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
@@ -61,14 +61,14 @@ public EquilateralTriangle shapeType(@javax.annotation.Nonnull String shapeType)
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -85,14 +85,14 @@ public EquilateralTriangle triangleType(@javax.annotation.Nonnull String triangl
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getTriangleType() {
     return triangleType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 8a6ac4345a0c..630ef8f88b0e 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -64,14 +64,14 @@ public FakeBigDecimalMap200Response someId(@javax.annotation.Nullable BigDecimal
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getSomeId() {
     return someId;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -96,14 +96,14 @@ public FakeBigDecimalMap200Response putSomeMapItem(String key, BigDecimal someMa
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, BigDecimal> getSomeMap() {
     return someMap;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 6bdbe1590b99..66766a396e0f 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -64,14 +64,14 @@ public FileSchemaTestClass _file(@javax.annotation.Nullable ModelFile _file) {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public ModelFile getFile() {
     return _file;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -96,14 +96,14 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<ModelFile> getFiles() {
     return files;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Foo.java
index 9c667af93193..b91118d5551f 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Foo.java
@@ -56,14 +56,14 @@ public Foo bar(@javax.annotation.Nullable String bar) {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBar() {
     return bar;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 4194f6cb2871..c935223dd6ba 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -57,14 +57,14 @@ public FooGetDefaultResponse string(@javax.annotation.Nullable Foo string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Foo getString() {
     return string;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FormatTest.java
index 192c27e80cd9..5e282197f38e 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -138,14 +138,14 @@ public FormatTest integer(@javax.annotation.Nullable Integer integer) {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getInteger() {
     return integer;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -164,14 +164,14 @@ public FormatTest int32(@javax.annotation.Nullable Integer int32) {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getInt32() {
     return int32;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -188,14 +188,14 @@ public FormatTest int64(@javax.annotation.Nullable Long int64) {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getInt64() {
     return int64;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -214,14 +214,14 @@ public FormatTest number(@javax.annotation.Nonnull BigDecimal number) {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public BigDecimal getNumber() {
     return number;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -240,14 +240,14 @@ public FormatTest _float(@javax.annotation.Nullable Float _float) {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Float getFloat() {
     return _float;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -266,14 +266,14 @@ public FormatTest _double(@javax.annotation.Nullable Double _double) {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Double getDouble() {
     return _double;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -290,14 +290,14 @@ public FormatTest decimal(@javax.annotation.Nullable BigDecimal decimal) {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getDecimal() {
     return decimal;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -314,14 +314,14 @@ public FormatTest string(@javax.annotation.Nullable String string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getString() {
     return string;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -338,14 +338,14 @@ public FormatTest _byte(@javax.annotation.Nonnull byte[] _byte) {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public byte[] getByte() {
     return _byte;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -362,14 +362,14 @@ public FormatTest binary(@javax.annotation.Nullable File binary) {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public File getBinary() {
     return binary;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -386,14 +386,14 @@ public FormatTest date(@javax.annotation.Nonnull LocalDate date) {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public LocalDate getDate() {
     return date;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -410,14 +410,14 @@ public FormatTest dateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OffsetDateTime getDateTime() {
     return dateTime;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -434,14 +434,14 @@ public FormatTest uuid(@javax.annotation.Nullable UUID uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public UUID getUuid() {
     return uuid;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -458,14 +458,14 @@ public FormatTest password(@javax.annotation.Nonnull String password) {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getPassword() {
     return password;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -482,14 +482,14 @@ public FormatTest patternWithDigits(@javax.annotation.Nullable String patternWit
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPatternWithDigits() {
     return patternWithDigits;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -506,14 +506,14 @@ public FormatTest patternWithDigitsAndDelimiter(@javax.annotation.Nullable Strin
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPatternWithDigitsAndDelimiter() {
     return patternWithDigitsAndDelimiter;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/GrandparentAnimal.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
index a797d730f4cd..eaf4a4b12a2c 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
@@ -70,14 +70,14 @@ public GrandparentAnimal petType(@javax.annotation.Nonnull String petType) {
    * @return petType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getPetType() {
     return petType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPetType(@javax.annotation.Nonnull String petType) {
     this.petType = petType;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 92a1fe401524..f2b35871d574 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -66,7 +66,7 @@ public HasOnlyReadOnly(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBar() {
     return bar;
@@ -80,7 +80,7 @@ public String getBar() {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getFoo() {
     return foo;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 0578235c39e0..e79fd8e66617 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -64,7 +64,7 @@ public String getNullableMessage() {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
index d019b1b87f23..93abd238f97f 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
@@ -61,14 +61,14 @@ public IsoscelesTriangle shapeType(@javax.annotation.Nonnull String shapeType) {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -85,14 +85,14 @@ public IsoscelesTriangle triangleType(@javax.annotation.Nonnull String triangleT
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getTriangleType() {
     return triangleType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/MapTest.java
index 828c1d70d8a2..e43cb165a78f 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/MapTest.java
@@ -116,14 +116,14 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Map<String, String>> getMapMapOfString() {
     return mapMapOfString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -148,14 +148,14 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, InnerEnum> getMapOfEnumString() {
     return mapOfEnumString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -180,14 +180,14 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Boolean> getDirectMap() {
     return directMap;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -212,14 +212,14 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Boolean> getIndirectMap() {
     return indirectMap;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index ad82a2c1f8be..73f11aabc760 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -71,14 +71,14 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@javax.annotation.Nullab
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public UUID getUuid() {
     return uuid;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -95,14 +95,14 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@javax.annotation.Nu
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OffsetDateTime getDateTime() {
     return dateTime;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -127,14 +127,14 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Animal> getMap() {
     return map;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Model200Response.java
index 14124ff8fcef..a4e48c5c46fb 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -61,14 +61,14 @@ public Model200Response name(@javax.annotation.Nullable Integer name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -85,14 +85,14 @@ public Model200Response propertyClass(@javax.annotation.Nullable String property
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPropertyClass() {
     return propertyClass;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 5fd326a90908..42e5766af55c 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -66,14 +66,14 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getCode() {
     return code;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -90,14 +90,14 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getType() {
     return type;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -114,14 +114,14 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getMessage() {
     return message;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelFile.java
index 6fca51fce4fd..b970cde011b5 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -56,14 +56,14 @@ public ModelFile sourceURI(@javax.annotation.Nullable String sourceURI) {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSourceURI() {
     return sourceURI;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelList.java
index ac97c50ccafa..fee6e4ec982b 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelList.java
@@ -56,14 +56,14 @@ public ModelList _123list(@javax.annotation.Nullable String _123list) {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String get123list() {
     return _123list;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelReturn.java
index a83d6f6408e1..5bbd397992f2 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -56,14 +56,14 @@ public ModelReturn _return(@javax.annotation.Nullable Integer _return) {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getReturn() {
     return _return;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Name.java
index 80ae78b791aa..4ac44bf65919 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Name.java
@@ -81,14 +81,14 @@ public Name name(@javax.annotation.Nonnull Integer name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public Integer getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -100,7 +100,7 @@ public void setName(@javax.annotation.Nonnull Integer name) {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getSnakeCase() {
     return snakeCase;
@@ -119,14 +119,14 @@ public Name property(@javax.annotation.Nullable String property) {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getProperty() {
     return property;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -138,7 +138,7 @@ public void setProperty(@javax.annotation.Nullable String property) {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer get123number() {
     return _123number;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/NullableClass.java
index f4e760fab123..2ea342b91cbe 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -121,7 +121,7 @@ public Integer getIntegerProp() {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -153,7 +153,7 @@ public BigDecimal getNumberProp() {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -185,7 +185,7 @@ public Boolean getBooleanProp() {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -217,7 +217,7 @@ public String getStringProp() {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -249,7 +249,7 @@ public LocalDate getDateProp() {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -281,7 +281,7 @@ public OffsetDateTime getDatetimeProp() {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -325,7 +325,7 @@ public List<Object> getArrayNullableProp() {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -369,7 +369,7 @@ public List<Object> getArrayAndItemsNullableProp() {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -404,14 +404,14 @@ public NullableClass addArrayItemsNullableItem(Object arrayItemsNullableItem) {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Object> getArrayItemsNullable() {
     return arrayItemsNullable;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -445,7 +445,7 @@ public Map<String, Object> getObjectNullableProp() {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -489,7 +489,7 @@ public Map<String, Object> getObjectAndItemsNullableProp() {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -524,14 +524,14 @@ public NullableClass putObjectItemsNullableItem(String key, Object objectItemsNu
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Object> getObjectItemsNullable() {
     return objectItemsNullable;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/NumberOnly.java
index 2304751309ff..ce5f0d3a16d9 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -57,14 +57,14 @@ public NumberOnly justNumber(@javax.annotation.Nullable BigDecimal justNumber) {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getJustNumber() {
     return justNumber;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index eac3e8579b00..7c6d294ecd01 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -75,14 +75,14 @@ public ObjectWithDeprecatedFields uuid(@javax.annotation.Nullable String uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getUuid() {
     return uuid;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -101,14 +101,14 @@ public ObjectWithDeprecatedFields id(@javax.annotation.Nullable BigDecimal id) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -127,14 +127,14 @@ public ObjectWithDeprecatedFields deprecatedRef(@javax.annotation.Nullable Depre
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public DeprecatedObject getDeprecatedRef() {
     return deprecatedRef;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -161,14 +161,14 @@ public ObjectWithDeprecatedFields addBarsItem(String barsItem) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<String> getBars() {
     return bars;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Order.java
index b61f80f7c8f9..f9742e6e39b1 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Order.java
@@ -119,14 +119,14 @@ public Order id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -143,14 +143,14 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getPetId() {
     return petId;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -167,14 +167,14 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getQuantity() {
     return quantity;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -191,14 +191,14 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OffsetDateTime getShipDate() {
     return shipDate;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -215,14 +215,14 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -239,14 +239,14 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getComplete() {
     return complete;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/OuterComposite.java
index 1fcf185f0465..29007d6a5d6b 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -67,14 +67,14 @@ public OuterComposite myNumber(@javax.annotation.Nullable BigDecimal myNumber) {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getMyNumber() {
     return myNumber;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -91,14 +91,14 @@ public OuterComposite myString(@javax.annotation.Nullable String myString) {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getMyString() {
     return myString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -115,14 +115,14 @@ public OuterComposite myBoolean(@javax.annotation.Nullable Boolean myBoolean) {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getMyBoolean() {
     return myBoolean;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Pet.java
index db02cf0d123d..e107cb2ff9f5 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Pet.java
@@ -122,14 +122,14 @@ public Pet id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -146,14 +146,14 @@ public Pet category(@javax.annotation.Nullable Category category) {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Category getCategory() {
     return category;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -170,14 +170,14 @@ public Pet name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -202,14 +202,14 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public List<String> getPhotoUrls() {
     return photoUrls;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -234,14 +234,14 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Tag> getTags() {
     return tags;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -258,14 +258,14 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
index 19dceef1bff6..51120b5254fa 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
@@ -56,14 +56,14 @@ public QuadrilateralInterface quadrilateralType(@javax.annotation.Nonnull String
    * @return quadrilateralType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getQuadrilateralType() {
     return quadrilateralType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@javax.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 614a003fe43c..b0c3c72363f8 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -64,7 +64,7 @@ public ReadOnlyFirst(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBar() {
     return bar;
@@ -83,14 +83,14 @@ public ReadOnlyFirst baz(@javax.annotation.Nullable String baz) {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBaz() {
     return baz;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ScaleneTriangle.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
index d8a905d4ff1e..8911dbd28af7 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
@@ -61,14 +61,14 @@ public ScaleneTriangle shapeType(@javax.annotation.Nonnull String shapeType) {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -85,14 +85,14 @@ public ScaleneTriangle triangleType(@javax.annotation.Nonnull String triangleTyp
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getTriangleType() {
     return triangleType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ShapeInterface.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ShapeInterface.java
index ccf89551f0c9..00c37e3a401f 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ShapeInterface.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ShapeInterface.java
@@ -56,14 +56,14 @@ public ShapeInterface shapeType(@javax.annotation.Nonnull String shapeType) {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
index b62fc6654d8a..62deb35441bd 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
@@ -61,14 +61,14 @@ public SimpleQuadrilateral shapeType(@javax.annotation.Nonnull String shapeType)
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -85,14 +85,14 @@ public SimpleQuadrilateral quadrilateralType(@javax.annotation.Nonnull String qu
    * @return quadrilateralType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getQuadrilateralType() {
     return quadrilateralType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@javax.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 1c2100edd187..4cc4c7c55566 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -61,14 +61,14 @@ public SpecialModelName() {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long get$SpecialPropertyName() {
     return $specialPropertyName;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
@@ -85,14 +85,14 @@ public SpecialModelName specialModelName(@javax.annotation.Nullable String speci
    * @return specialModelName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SPECIAL_MODEL_NAME)
+  @JsonProperty(value = JSON_PROPERTY_SPECIAL_MODEL_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSpecialModelName() {
     return specialModelName;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SPECIAL_MODEL_NAME)
+  @JsonProperty(value = JSON_PROPERTY_SPECIAL_MODEL_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSpecialModelName(@javax.annotation.Nullable String specialModelName) {
     this.specialModelName = specialModelName;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Tag.java
index c6847294be65..e1659060b6df 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Tag.java
@@ -61,14 +61,14 @@ public Tag id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -85,14 +85,14 @@ public Tag name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 8615fa68ddbb..cfeb7cbef5f0 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -62,14 +62,14 @@ public TestInlineFreeformAdditionalPropertiesRequest someProperty(@javax.annotat
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSomeProperty() {
     return someProperty;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/TriangleInterface.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/TriangleInterface.java
index bdf639fc39db..499a84829b1e 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/TriangleInterface.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/TriangleInterface.java
@@ -56,14 +56,14 @@ public TriangleInterface triangleType(@javax.annotation.Nonnull String triangleT
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getTriangleType() {
     return triangleType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/User.java
index 7911ce706268..78bd2e4305ac 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/User.java
@@ -112,14 +112,14 @@ public User id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -136,14 +136,14 @@ public User username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getUsername() {
     return username;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -160,14 +160,14 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getFirstName() {
     return firstName;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -184,14 +184,14 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getLastName() {
     return lastName;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -208,14 +208,14 @@ public User email(@javax.annotation.Nullable String email) {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getEmail() {
     return email;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -232,14 +232,14 @@ public User password(@javax.annotation.Nullable String password) {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPassword() {
     return password;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -256,14 +256,14 @@ public User phone(@javax.annotation.Nullable String phone) {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPhone() {
     return phone;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -280,14 +280,14 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getUserStatus() {
     return userStatus;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
@@ -304,14 +304,14 @@ public User objectWithNoDeclaredProps(@javax.annotation.Nullable Object objectWi
    * @return objectWithNoDeclaredProps
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Object getObjectWithNoDeclaredProps() {
     return objectWithNoDeclaredProps;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectWithNoDeclaredProps(@javax.annotation.Nullable Object objectWithNoDeclaredProps) {
     this.objectWithNoDeclaredProps = objectWithNoDeclaredProps;
@@ -333,7 +333,7 @@ public Object getObjectWithNoDeclaredPropsNullable() {
         return objectWithNoDeclaredPropsNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getObjectWithNoDeclaredPropsNullable_JsonNullable() {
@@ -365,7 +365,7 @@ public Object getAnyTypeProp() {
         return anyTypeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANY_TYPE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ANY_TYPE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnyTypeProp_JsonNullable() {
@@ -397,7 +397,7 @@ public Object getAnyTypePropNullable() {
         return anyTypePropNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANY_TYPE_PROP_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ANY_TYPE_PROP_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnyTypePropNullable_JsonNullable() {
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Whale.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Whale.java
index 0a3cb543b947..55da2d067c89 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Whale.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Whale.java
@@ -66,14 +66,14 @@ public Whale hasBaleen(@javax.annotation.Nullable Boolean hasBaleen) {
    * @return hasBaleen
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_HAS_BALEEN)
+  @JsonProperty(value = JSON_PROPERTY_HAS_BALEEN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getHasBaleen() {
     return hasBaleen;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_HAS_BALEEN)
+  @JsonProperty(value = JSON_PROPERTY_HAS_BALEEN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setHasBaleen(@javax.annotation.Nullable Boolean hasBaleen) {
     this.hasBaleen = hasBaleen;
@@ -90,14 +90,14 @@ public Whale hasTeeth(@javax.annotation.Nullable Boolean hasTeeth) {
    * @return hasTeeth
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_HAS_TEETH)
+  @JsonProperty(value = JSON_PROPERTY_HAS_TEETH, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getHasTeeth() {
     return hasTeeth;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_HAS_TEETH)
+  @JsonProperty(value = JSON_PROPERTY_HAS_TEETH, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setHasTeeth(@javax.annotation.Nullable Boolean hasTeeth) {
     this.hasTeeth = hasTeeth;
@@ -114,14 +114,14 @@ public Whale className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Zebra.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Zebra.java
index 758e13224514..fa8a6ca6683f 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Zebra.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Zebra.java
@@ -104,14 +104,14 @@ public Zebra type(@javax.annotation.Nullable TypeEnum type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public TypeEnum getType() {
     return type;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -128,14 +128,14 @@ public Zebra className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
index e1ee0706c7b1..5e139136efdf 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
@@ -56,7 +56,7 @@ public AdditionalPropertiesAnyType name(@javax.annotation.Nullable String name)
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
index 294c1d3cdaf1..72f3ec428ded 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
@@ -57,7 +57,7 @@ public AdditionalPropertiesArray name(@javax.annotation.Nullable String name) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -65,7 +65,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
index dbd8bf33ba14..1ef4e0fe24cf 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
@@ -56,7 +56,7 @@ public AdditionalPropertiesBoolean name(@javax.annotation.Nullable String name)
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index a7f638095fb9..a24fdc7a8c73 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -115,7 +115,7 @@ public AdditionalPropertiesClass putMapStringItem(String key, String mapStringIt
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapString() {
@@ -123,7 +123,7 @@ public Map<String, String> getMapString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapString(@javax.annotation.Nullable Map<String, String> mapString) {
     this.mapString = mapString;
@@ -150,7 +150,7 @@ public AdditionalPropertiesClass putMapNumberItem(String key, BigDecimal mapNumb
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getMapNumber() {
@@ -158,7 +158,7 @@ public Map<String, BigDecimal> getMapNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapNumber(@javax.annotation.Nullable Map<String, BigDecimal> mapNumber) {
     this.mapNumber = mapNumber;
@@ -184,7 +184,7 @@ public AdditionalPropertiesClass putMapIntegerItem(String key, Integer mapIntege
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Integer> getMapInteger() {
@@ -192,7 +192,7 @@ public Map<String, Integer> getMapInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapInteger(@javax.annotation.Nullable Map<String, Integer> mapInteger) {
     this.mapInteger = mapInteger;
@@ -218,7 +218,7 @@ public AdditionalPropertiesClass putMapBooleanItem(String key, Boolean mapBoolea
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getMapBoolean() {
@@ -226,7 +226,7 @@ public Map<String, Boolean> getMapBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapBoolean(@javax.annotation.Nullable Map<String, Boolean> mapBoolean) {
     this.mapBoolean = mapBoolean;
@@ -253,7 +253,7 @@ public AdditionalPropertiesClass putMapArrayIntegerItem(String key, List<Integer
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Integer>> getMapArrayInteger() {
@@ -261,7 +261,7 @@ public Map<String, List<Integer>> getMapArrayInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayInteger(@javax.annotation.Nullable Map<String, List<Integer>> mapArrayInteger) {
     this.mapArrayInteger = mapArrayInteger;
@@ -288,7 +288,7 @@ public AdditionalPropertiesClass putMapArrayAnytypeItem(String key, List<Object>
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Object>> getMapArrayAnytype() {
@@ -296,7 +296,7 @@ public Map<String, List<Object>> getMapArrayAnytype() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayAnytype(@javax.annotation.Nullable Map<String, List<Object>> mapArrayAnytype) {
     this.mapArrayAnytype = mapArrayAnytype;
@@ -323,7 +323,7 @@ public AdditionalPropertiesClass putMapMapStringItem(String key, Map<String, Str
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapString() {
@@ -331,7 +331,7 @@ public Map<String, Map<String, String>> getMapMapString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapString) {
     this.mapMapString = mapMapString;
@@ -358,7 +358,7 @@ public AdditionalPropertiesClass putMapMapAnytypeItem(String key, Map<String, Ob
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, Object>> getMapMapAnytype() {
@@ -366,7 +366,7 @@ public Map<String, Map<String, Object>> getMapMapAnytype() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapAnytype(@javax.annotation.Nullable Map<String, Map<String, Object>> mapMapAnytype) {
     this.mapMapAnytype = mapMapAnytype;
@@ -384,7 +384,7 @@ public AdditionalPropertiesClass anytype1(@javax.annotation.Nullable Object anyt
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype1() {
@@ -392,7 +392,7 @@ public Object getAnytype1() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype1(@javax.annotation.Nullable Object anytype1) {
     this.anytype1 = anytype1;
@@ -410,7 +410,7 @@ public AdditionalPropertiesClass anytype2(@javax.annotation.Nullable Object anyt
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype2() {
@@ -418,7 +418,7 @@ public Object getAnytype2() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype2(@javax.annotation.Nullable Object anytype2) {
     this.anytype2 = anytype2;
@@ -436,7 +436,7 @@ public AdditionalPropertiesClass anytype3(@javax.annotation.Nullable Object anyt
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype3() {
@@ -444,7 +444,7 @@ public Object getAnytype3() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype3(@javax.annotation.Nullable Object anytype3) {
     this.anytype3 = anytype3;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
index 8ecf8c4a737e..6d23d383a16f 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
@@ -56,7 +56,7 @@ public AdditionalPropertiesInteger name(@javax.annotation.Nullable String name)
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
index f95aeed78aeb..0c0cd12afb0d 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
@@ -57,7 +57,7 @@ public AdditionalPropertiesNumber name(@javax.annotation.Nullable String name) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -65,7 +65,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
index 1539d97cfd37..a1ef2bc902af 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
@@ -56,7 +56,7 @@ public AdditionalPropertiesObject name(@javax.annotation.Nullable String name) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
index e9637c427952..ff9221bedb3f 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
@@ -56,7 +56,7 @@ public AdditionalPropertiesString name(@javax.annotation.Nullable String name) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Animal.java
index 35c6b38130de..153c9d5b23d4 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Animal.java
@@ -73,7 +73,7 @@ public Animal className(@javax.annotation.Nonnull String className) {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -81,7 +81,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -99,7 +99,7 @@ public Animal color(@javax.annotation.Nullable String color) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -107,7 +107,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 26ed01445efe..176ddc65e3e1 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -66,7 +66,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -74,7 +74,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 35b4240b78e2..0abb9baaff24 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -66,7 +66,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -74,7 +74,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayTest.java
index a8a0c4b12b56..a2e1db601147 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -75,7 +75,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -83,7 +83,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -110,7 +110,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -118,7 +118,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -145,7 +145,7 @@ public ArrayTest addArrayArrayOfModelItem(List<@Valid ReadOnlyFirst> arrayArrayO
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<@Valid ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -153,7 +153,7 @@ public ArrayTest addArrayArrayOfModelItem(List<@Valid ReadOnlyFirst> arrayArrayO
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<@Valid ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/BigCat.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/BigCat.java
index 871a3bc45a5a..d9fd8d20f45d 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/BigCat.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/BigCat.java
@@ -103,7 +103,7 @@ public BigCat kind(@javax.annotation.Nullable KindEnum kind) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public KindEnum getKind() {
@@ -111,7 +111,7 @@ public KindEnum getKind() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setKind(@javax.annotation.Nullable KindEnum kind) {
     this.kind = kind;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Capitalization.java
index f25ca6a66f99..e8bebfd13b9e 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -78,7 +78,7 @@ public Capitalization smallCamel(@javax.annotation.Nullable String smallCamel) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -86,7 +86,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -104,7 +104,7 @@ public Capitalization capitalCamel(@javax.annotation.Nullable String capitalCame
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -112,7 +112,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -130,7 +130,7 @@ public Capitalization smallSnake(@javax.annotation.Nullable String smallSnake) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -138,7 +138,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -156,7 +156,7 @@ public Capitalization capitalSnake(@javax.annotation.Nullable String capitalSnak
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -164,7 +164,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -182,7 +182,7 @@ public Capitalization scAETHFlowPoints(@javax.annotation.Nullable String scAETHF
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -190,7 +190,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -208,7 +208,7 @@ public Capitalization ATT_NAME(@javax.annotation.Nullable String ATT_NAME) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -216,7 +216,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Cat.java
index ed709c31966d..e6effc92eb41 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Cat.java
@@ -67,7 +67,7 @@ public Cat declawed(@javax.annotation.Nullable Boolean declawed) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isDeclawed() {
@@ -75,7 +75,7 @@ public Boolean isDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Category.java
index 7dd75193966a..cac90de6e000 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Category.java
@@ -58,7 +58,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -66,7 +66,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -85,7 +85,7 @@ public Category name(@javax.annotation.Nonnull String name) {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -93,7 +93,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ClassModel.java
index 2983208e7c0a..f9c548de3199 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -53,7 +53,7 @@ public ClassModel propertyClass(@javax.annotation.Nullable String propertyClass)
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -61,7 +61,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Client.java
index 44ebadd2a849..f26de8431d23 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Client.java
@@ -53,7 +53,7 @@ public Client client(@javax.annotation.Nullable String client) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -61,7 +61,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Dog.java
index b092baf57535..e73c26c3e7d6 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Dog.java
@@ -64,7 +64,7 @@ public Dog breed(@javax.annotation.Nullable String breed) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -72,7 +72,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/EnumArrays.java
index c25671d90f78..5df4e3cdbbf4 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -131,7 +131,7 @@ public EnumArrays justSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbo
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -139,7 +139,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -165,7 +165,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -173,7 +173,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/EnumTest.java
index 4fb0150b7281..9555d3b80198 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -219,7 +219,7 @@ public EnumTest enumString(@javax.annotation.Nullable EnumStringEnum enumString)
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -227,7 +227,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -246,7 +246,7 @@ public EnumTest enumStringRequired(@javax.annotation.Nonnull EnumStringRequiredE
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -254,7 +254,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -272,7 +272,7 @@ public EnumTest enumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteg
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -280,7 +280,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -298,7 +298,7 @@ public EnumTest enumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber)
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -306,7 +306,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -325,7 +325,7 @@ public EnumTest outerEnum(@javax.annotation.Nullable OuterEnum outerEnum) {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnum getOuterEnum() {
@@ -333,7 +333,7 @@ public OuterEnum getOuterEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnum(@javax.annotation.Nullable OuterEnum outerEnum) {
     this.outerEnum = outerEnum;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index ad3a1c257243..9638ba3a52d1 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -63,7 +63,7 @@ public FileSchemaTestClass _file(@javax.annotation.Nullable ModelFile _file) {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -71,7 +71,7 @@ public ModelFile getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -98,7 +98,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<@Valid ModelFile> getFiles() {
@@ -106,7 +106,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<@Valid ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/FormatTest.java
index 962e51deb472..a55d59c1e053 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -126,7 +126,7 @@ public FormatTest integer(@javax.annotation.Nullable Integer integer) {
    */
   @javax.annotation.Nullable
  @Min(10) @Max(100)
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -134,7 +134,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -154,7 +154,7 @@ public FormatTest int32(@javax.annotation.Nullable Integer int32) {
    */
   @javax.annotation.Nullable
  @Min(20) @Max(200)
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -162,7 +162,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -180,7 +180,7 @@ public FormatTest int64(@javax.annotation.Nullable Long int64) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -188,7 +188,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -210,7 +210,7 @@ public FormatTest number(@javax.annotation.Nonnull BigDecimal number) {
   @NotNull
   @Valid
  @DecimalMin("32.1") @DecimalMax("543.2")
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -218,7 +218,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -238,7 +238,7 @@ public FormatTest _float(@javax.annotation.Nullable Float _float) {
    */
   @javax.annotation.Nullable
  @DecimalMin("54.3") @DecimalMax("987.6")
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -246,7 +246,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -266,7 +266,7 @@ public FormatTest _double(@javax.annotation.Nullable Double _double) {
    */
   @javax.annotation.Nullable
  @DecimalMin("67.8") @DecimalMax("123.4")
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -274,7 +274,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -292,7 +292,7 @@ public FormatTest string(@javax.annotation.Nullable String string) {
    */
   @javax.annotation.Nullable
  @Pattern(regexp="/[a-z]/i")
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -300,7 +300,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -319,7 +319,7 @@ public FormatTest _byte(@javax.annotation.Nonnull byte[] _byte) {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -327,7 +327,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -346,7 +346,7 @@ public FormatTest binary(@javax.annotation.Nullable File binary) {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -354,7 +354,7 @@ public File getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -374,7 +374,7 @@ public FormatTest date(@javax.annotation.Nonnull LocalDate date) {
   @NotNull
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -382,7 +382,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -401,7 +401,7 @@ public FormatTest dateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -409,7 +409,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -428,7 +428,7 @@ public FormatTest uuid(@javax.annotation.Nullable UUID uuid) {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -436,7 +436,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -455,7 +455,7 @@ public FormatTest password(@javax.annotation.Nonnull String password) {
   @javax.annotation.Nonnull
   @NotNull
  @Size(min=10,max=64)
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -463,7 +463,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -482,7 +482,7 @@ public FormatTest bigDecimal(@javax.annotation.Nullable BigDecimal bigDecimal) {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getBigDecimal() {
@@ -490,7 +490,7 @@ public BigDecimal getBigDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBigDecimal(@javax.annotation.Nullable BigDecimal bigDecimal) {
     this.bigDecimal = bigDecimal;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index fd55d0b45c61..f98d5fd128fb 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -51,8 +51,8 @@ public HasOnlyReadOnly() {
    */
   @JsonCreator
   public HasOnlyReadOnly(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar, 
-    @JsonProperty(JSON_PROPERTY_FOO) String foo
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar, 
+    @JsonProperty(value = JSON_PROPERTY_FOO, required = false) String foo
   ) {
     this();
     this.bar = bar;
@@ -65,7 +65,7 @@ public HasOnlyReadOnly(
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -80,7 +80,7 @@ public String getBar() {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/MapTest.java
index d617744f80cd..4b3e29cc8158 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/MapTest.java
@@ -114,7 +114,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -122,7 +122,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -148,7 +148,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -156,7 +156,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -182,7 +182,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -190,7 +190,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -216,7 +216,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -224,7 +224,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 50045c7bbec4..b4fa4ae066a6 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -69,7 +69,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@javax.annotation.Nullab
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -77,7 +77,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -96,7 +96,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@javax.annotation.Nu
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -104,7 +104,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -131,7 +131,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -139,7 +139,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Model200Response.java
index def5ec821915..a24ac6aac89b 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -59,7 +59,7 @@ public Model200Response name(@javax.annotation.Nullable Integer name) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -67,7 +67,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -85,7 +85,7 @@ public Model200Response propertyClass(@javax.annotation.Nullable String property
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -93,7 +93,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index e21ccb9f2f8d..550148ff0073 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -64,7 +64,7 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -72,7 +72,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -90,7 +90,7 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -98,7 +98,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -116,7 +116,7 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -124,7 +124,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelFile.java
index ab94179544ee..5fe5b0be8a1b 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -54,7 +54,7 @@ public ModelFile sourceURI(@javax.annotation.Nullable String sourceURI) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -62,7 +62,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelList.java
index 23c3f5f4a6e5..edd49bc08f62 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelList.java
@@ -54,7 +54,7 @@ public ModelList _123list(@javax.annotation.Nullable String _123list) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -62,7 +62,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelReturn.java
index d18dccabbf63..58ffe2e3e33f 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -54,7 +54,7 @@ public ModelReturn _return(@javax.annotation.Nullable Integer _return) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -62,7 +62,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Name.java
index 0a40476e51a9..ab4e804aae1a 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Name.java
@@ -60,8 +60,8 @@ public Name() {
    */
   @JsonCreator
   public Name(
-    @JsonProperty(JSON_PROPERTY_SNAKE_CASE) Integer snakeCase, 
-    @JsonProperty(JSON_PROPERTY_123NUMBER) Integer _123number
+    @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false) Integer snakeCase, 
+    @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false) Integer _123number
   ) {
     this();
     this.snakeCase = snakeCase;
@@ -81,7 +81,7 @@ public Name name(@javax.annotation.Nonnull Integer name) {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -89,7 +89,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -101,7 +101,7 @@ public void setName(@javax.annotation.Nonnull Integer name) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -122,7 +122,7 @@ public Name property(@javax.annotation.Nullable String property) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -130,7 +130,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -142,7 +142,7 @@ public void setProperty(@javax.annotation.Nullable String property) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/NumberOnly.java
index 259a5c77561b..0d7dac9e078b 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -55,7 +55,7 @@ public NumberOnly justNumber(@javax.annotation.Nullable BigDecimal justNumber) {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -63,7 +63,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Order.java
index 4dc5cb0d53b0..70eefa3d6931 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Order.java
@@ -116,7 +116,7 @@ public Order id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -124,7 +124,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -142,7 +142,7 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -150,7 +150,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -168,7 +168,7 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -176,7 +176,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -195,7 +195,7 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -203,7 +203,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -221,7 +221,7 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -229,7 +229,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -247,7 +247,7 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isComplete() {
@@ -255,7 +255,7 @@ public Boolean isComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/OuterComposite.java
index ea7ca6ce7cc7..3a1d9b030d04 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -65,7 +65,7 @@ public OuterComposite myNumber(@javax.annotation.Nullable BigDecimal myNumber) {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -73,7 +73,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -91,7 +91,7 @@ public OuterComposite myString(@javax.annotation.Nullable String myString) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -99,7 +99,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -117,7 +117,7 @@ public OuterComposite myBoolean(@javax.annotation.Nullable Boolean myBoolean) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isMyBoolean() {
@@ -125,7 +125,7 @@ public Boolean isMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Pet.java
index 2f382ea928d8..a01953d4f534 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Pet.java
@@ -123,7 +123,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -131,7 +131,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -150,7 +150,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -158,7 +158,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -177,7 +177,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -185,7 +185,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -212,7 +212,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -221,7 +221,7 @@ public Set<String> getPhotoUrls() {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -248,7 +248,7 @@ public Pet addTagsItem(Tag tagsItem) {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<@Valid Tag> getTags() {
@@ -256,7 +256,7 @@ public Pet addTagsItem(Tag tagsItem) {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<@Valid Tag> tags) {
     this.tags = tags;
@@ -274,7 +274,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -282,7 +282,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 98ef88193a89..c32ede66fc2a 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -50,7 +50,7 @@ public ReadOnlyFirst() {
    */
   @JsonCreator
   public ReadOnlyFirst(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar
   ) {
     this();
     this.bar = bar;
@@ -62,7 +62,7 @@ public ReadOnlyFirst(
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -83,7 +83,7 @@ public ReadOnlyFirst baz(@javax.annotation.Nullable String baz) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -91,7 +91,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 4893e577f56c..1c7699c3db4b 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -54,7 +54,7 @@ public SpecialModelName() {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -62,7 +62,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Tag.java
index fb6758c7c31b..d382389c89a2 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Tag.java
@@ -58,7 +58,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -66,7 +66,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -84,7 +84,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -92,7 +92,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/TypeHolderDefault.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
index 13b1701514f7..f31505437096 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
@@ -78,7 +78,7 @@ public TypeHolderDefault stringItem(@javax.annotation.Nonnull String stringItem)
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -86,7 +86,7 @@ public String getStringItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -106,7 +106,7 @@ public TypeHolderDefault numberItem(@javax.annotation.Nonnull BigDecimal numberI
   @NotNull
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -114,7 +114,7 @@ public BigDecimal getNumberItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -133,7 +133,7 @@ public TypeHolderDefault integerItem(@javax.annotation.Nonnull Integer integerIt
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -141,7 +141,7 @@ public Integer getIntegerItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -160,7 +160,7 @@ public TypeHolderDefault boolItem(@javax.annotation.Nonnull Boolean boolItem) {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean isBoolItem() {
@@ -168,7 +168,7 @@ public Boolean isBoolItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -195,7 +195,7 @@ public TypeHolderDefault addArrayItemItem(Integer arrayItemItem) {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -203,7 +203,7 @@ public List<Integer> getArrayItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/TypeHolderExample.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/TypeHolderExample.java
index 238572385ad2..8e4c66770d80 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/TypeHolderExample.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/TypeHolderExample.java
@@ -83,7 +83,7 @@ public TypeHolderExample stringItem(@javax.annotation.Nonnull String stringItem)
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -91,7 +91,7 @@ public String getStringItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -111,7 +111,7 @@ public TypeHolderExample numberItem(@javax.annotation.Nonnull BigDecimal numberI
   @NotNull
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -119,7 +119,7 @@ public BigDecimal getNumberItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -138,7 +138,7 @@ public TypeHolderExample floatItem(@javax.annotation.Nonnull Float floatItem) {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Float getFloatItem() {
@@ -146,7 +146,7 @@ public Float getFloatItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setFloatItem(@javax.annotation.Nonnull Float floatItem) {
     this.floatItem = floatItem;
@@ -165,7 +165,7 @@ public TypeHolderExample integerItem(@javax.annotation.Nonnull Integer integerIt
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -173,7 +173,7 @@ public Integer getIntegerItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -192,7 +192,7 @@ public TypeHolderExample boolItem(@javax.annotation.Nonnull Boolean boolItem) {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean isBoolItem() {
@@ -200,7 +200,7 @@ public Boolean isBoolItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -227,7 +227,7 @@ public TypeHolderExample addArrayItemItem(Integer arrayItemItem) {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -235,7 +235,7 @@ public List<Integer> getArrayItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/User.java
index f6a91950e5d6..bf9eb55c3e08 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/User.java
@@ -88,7 +88,7 @@ public User id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -96,7 +96,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -114,7 +114,7 @@ public User username(@javax.annotation.Nullable String username) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -122,7 +122,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -140,7 +140,7 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -148,7 +148,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -166,7 +166,7 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -174,7 +174,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -192,7 +192,7 @@ public User email(@javax.annotation.Nullable String email) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -200,7 +200,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -218,7 +218,7 @@ public User password(@javax.annotation.Nullable String password) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -226,7 +226,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -244,7 +244,7 @@ public User phone(@javax.annotation.Nullable String phone) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -252,7 +252,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -270,7 +270,7 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -278,7 +278,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/XmlItem.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/XmlItem.java
index 5094e5a61f52..de520be8ccda 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/XmlItem.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/XmlItem.java
@@ -197,7 +197,7 @@ public XmlItem attributeString(@javax.annotation.Nullable String attributeString
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAttributeString() {
@@ -205,7 +205,7 @@ public String getAttributeString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeString(@javax.annotation.Nullable String attributeString) {
     this.attributeString = attributeString;
@@ -224,7 +224,7 @@ public XmlItem attributeNumber(@javax.annotation.Nullable BigDecimal attributeNu
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getAttributeNumber() {
@@ -232,7 +232,7 @@ public BigDecimal getAttributeNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeNumber(@javax.annotation.Nullable BigDecimal attributeNumber) {
     this.attributeNumber = attributeNumber;
@@ -250,7 +250,7 @@ public XmlItem attributeInteger(@javax.annotation.Nullable Integer attributeInte
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getAttributeInteger() {
@@ -258,7 +258,7 @@ public Integer getAttributeInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeInteger(@javax.annotation.Nullable Integer attributeInteger) {
     this.attributeInteger = attributeInteger;
@@ -276,7 +276,7 @@ public XmlItem attributeBoolean(@javax.annotation.Nullable Boolean attributeBool
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isAttributeBoolean() {
@@ -284,7 +284,7 @@ public Boolean isAttributeBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeBoolean(@javax.annotation.Nullable Boolean attributeBoolean) {
     this.attributeBoolean = attributeBoolean;
@@ -310,7 +310,7 @@ public XmlItem addWrappedArrayItem(Integer wrappedArrayItem) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getWrappedArray() {
@@ -318,7 +318,7 @@ public List<Integer> getWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setWrappedArray(@javax.annotation.Nullable List<Integer> wrappedArray) {
     this.wrappedArray = wrappedArray;
@@ -336,7 +336,7 @@ public XmlItem nameString(@javax.annotation.Nullable String nameString) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNameString() {
@@ -344,7 +344,7 @@ public String getNameString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameString(@javax.annotation.Nullable String nameString) {
     this.nameString = nameString;
@@ -363,7 +363,7 @@ public XmlItem nameNumber(@javax.annotation.Nullable BigDecimal nameNumber) {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNameNumber() {
@@ -371,7 +371,7 @@ public BigDecimal getNameNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameNumber(@javax.annotation.Nullable BigDecimal nameNumber) {
     this.nameNumber = nameNumber;
@@ -389,7 +389,7 @@ public XmlItem nameInteger(@javax.annotation.Nullable Integer nameInteger) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNameInteger() {
@@ -397,7 +397,7 @@ public Integer getNameInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameInteger(@javax.annotation.Nullable Integer nameInteger) {
     this.nameInteger = nameInteger;
@@ -415,7 +415,7 @@ public XmlItem nameBoolean(@javax.annotation.Nullable Boolean nameBoolean) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isNameBoolean() {
@@ -423,7 +423,7 @@ public Boolean isNameBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameBoolean(@javax.annotation.Nullable Boolean nameBoolean) {
     this.nameBoolean = nameBoolean;
@@ -449,7 +449,7 @@ public XmlItem addNameArrayItem(Integer nameArrayItem) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameArray() {
@@ -457,7 +457,7 @@ public List<Integer> getNameArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameArray(@javax.annotation.Nullable List<Integer> nameArray) {
     this.nameArray = nameArray;
@@ -483,7 +483,7 @@ public XmlItem addNameWrappedArrayItem(Integer nameWrappedArrayItem) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameWrappedArray() {
@@ -491,7 +491,7 @@ public List<Integer> getNameWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameWrappedArray(@javax.annotation.Nullable List<Integer> nameWrappedArray) {
     this.nameWrappedArray = nameWrappedArray;
@@ -509,7 +509,7 @@ public XmlItem prefixString(@javax.annotation.Nullable String prefixString) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixString() {
@@ -517,7 +517,7 @@ public String getPrefixString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixString(@javax.annotation.Nullable String prefixString) {
     this.prefixString = prefixString;
@@ -536,7 +536,7 @@ public XmlItem prefixNumber(@javax.annotation.Nullable BigDecimal prefixNumber)
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNumber() {
@@ -544,7 +544,7 @@ public BigDecimal getPrefixNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNumber(@javax.annotation.Nullable BigDecimal prefixNumber) {
     this.prefixNumber = prefixNumber;
@@ -562,7 +562,7 @@ public XmlItem prefixInteger(@javax.annotation.Nullable Integer prefixInteger) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixInteger() {
@@ -570,7 +570,7 @@ public Integer getPrefixInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixInteger(@javax.annotation.Nullable Integer prefixInteger) {
     this.prefixInteger = prefixInteger;
@@ -588,7 +588,7 @@ public XmlItem prefixBoolean(@javax.annotation.Nullable Boolean prefixBoolean) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isPrefixBoolean() {
@@ -596,7 +596,7 @@ public Boolean isPrefixBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixBoolean(@javax.annotation.Nullable Boolean prefixBoolean) {
     this.prefixBoolean = prefixBoolean;
@@ -622,7 +622,7 @@ public XmlItem addPrefixArrayItem(Integer prefixArrayItem) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixArray() {
@@ -630,7 +630,7 @@ public List<Integer> getPrefixArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixArray(@javax.annotation.Nullable List<Integer> prefixArray) {
     this.prefixArray = prefixArray;
@@ -656,7 +656,7 @@ public XmlItem addPrefixWrappedArrayItem(Integer prefixWrappedArrayItem) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixWrappedArray() {
@@ -664,7 +664,7 @@ public List<Integer> getPrefixWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixWrappedArray(@javax.annotation.Nullable List<Integer> prefixWrappedArray) {
     this.prefixWrappedArray = prefixWrappedArray;
@@ -682,7 +682,7 @@ public XmlItem namespaceString(@javax.annotation.Nullable String namespaceString
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNamespaceString() {
@@ -690,7 +690,7 @@ public String getNamespaceString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceString(@javax.annotation.Nullable String namespaceString) {
     this.namespaceString = namespaceString;
@@ -709,7 +709,7 @@ public XmlItem namespaceNumber(@javax.annotation.Nullable BigDecimal namespaceNu
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNamespaceNumber() {
@@ -717,7 +717,7 @@ public BigDecimal getNamespaceNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceNumber(@javax.annotation.Nullable BigDecimal namespaceNumber) {
     this.namespaceNumber = namespaceNumber;
@@ -735,7 +735,7 @@ public XmlItem namespaceInteger(@javax.annotation.Nullable Integer namespaceInte
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNamespaceInteger() {
@@ -743,7 +743,7 @@ public Integer getNamespaceInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceInteger(@javax.annotation.Nullable Integer namespaceInteger) {
     this.namespaceInteger = namespaceInteger;
@@ -761,7 +761,7 @@ public XmlItem namespaceBoolean(@javax.annotation.Nullable Boolean namespaceBool
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isNamespaceBoolean() {
@@ -769,7 +769,7 @@ public Boolean isNamespaceBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceBoolean(@javax.annotation.Nullable Boolean namespaceBoolean) {
     this.namespaceBoolean = namespaceBoolean;
@@ -795,7 +795,7 @@ public XmlItem addNamespaceArrayItem(Integer namespaceArrayItem) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceArray() {
@@ -803,7 +803,7 @@ public List<Integer> getNamespaceArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceArray(@javax.annotation.Nullable List<Integer> namespaceArray) {
     this.namespaceArray = namespaceArray;
@@ -829,7 +829,7 @@ public XmlItem addNamespaceWrappedArrayItem(Integer namespaceWrappedArrayItem) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceWrappedArray() {
@@ -837,7 +837,7 @@ public List<Integer> getNamespaceWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceWrappedArray(@javax.annotation.Nullable List<Integer> namespaceWrappedArray) {
     this.namespaceWrappedArray = namespaceWrappedArray;
@@ -855,7 +855,7 @@ public XmlItem prefixNsString(@javax.annotation.Nullable String prefixNsString)
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixNsString() {
@@ -863,7 +863,7 @@ public String getPrefixNsString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsString(@javax.annotation.Nullable String prefixNsString) {
     this.prefixNsString = prefixNsString;
@@ -882,7 +882,7 @@ public XmlItem prefixNsNumber(@javax.annotation.Nullable BigDecimal prefixNsNumb
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNsNumber() {
@@ -890,7 +890,7 @@ public BigDecimal getPrefixNsNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsNumber(@javax.annotation.Nullable BigDecimal prefixNsNumber) {
     this.prefixNsNumber = prefixNsNumber;
@@ -908,7 +908,7 @@ public XmlItem prefixNsInteger(@javax.annotation.Nullable Integer prefixNsIntege
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixNsInteger() {
@@ -916,7 +916,7 @@ public Integer getPrefixNsInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsInteger(@javax.annotation.Nullable Integer prefixNsInteger) {
     this.prefixNsInteger = prefixNsInteger;
@@ -934,7 +934,7 @@ public XmlItem prefixNsBoolean(@javax.annotation.Nullable Boolean prefixNsBoolea
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isPrefixNsBoolean() {
@@ -942,7 +942,7 @@ public Boolean isPrefixNsBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsBoolean(@javax.annotation.Nullable Boolean prefixNsBoolean) {
     this.prefixNsBoolean = prefixNsBoolean;
@@ -968,7 +968,7 @@ public XmlItem addPrefixNsArrayItem(Integer prefixNsArrayItem) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsArray() {
@@ -976,7 +976,7 @@ public List<Integer> getPrefixNsArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsArray(@javax.annotation.Nullable List<Integer> prefixNsArray) {
     this.prefixNsArray = prefixNsArray;
@@ -1002,7 +1002,7 @@ public XmlItem addPrefixNsWrappedArrayItem(Integer prefixNsWrappedArrayItem) {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsWrappedArray() {
@@ -1010,7 +1010,7 @@ public List<Integer> getPrefixNsWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsWrappedArray(@javax.annotation.Nullable List<Integer> prefixNsWrappedArray) {
     this.prefixNsWrappedArray = prefixNsWrappedArray;
diff --git a/samples/client/petstore/java/restclient-nullable-arrays/src/main/java/org/openapitools/client/model/ByteArrayObject.java b/samples/client/petstore/java/restclient-nullable-arrays/src/main/java/org/openapitools/client/model/ByteArrayObject.java
index 182819500e4e..c8b4a0c57646 100644
--- a/samples/client/petstore/java/restclient-nullable-arrays/src/main/java/org/openapitools/client/model/ByteArrayObject.java
+++ b/samples/client/petstore/java/restclient-nullable-arrays/src/main/java/org/openapitools/client/model/ByteArrayObject.java
@@ -80,14 +80,14 @@ public byte[] getNullableArray() {
         return nullableArray.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<byte[]> getNullableArray_JsonNullable() {
     return nullableArray;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_ARRAY, required = false)
   public void setNullableArray_JsonNullable(JsonNullable<byte[]> nullableArray) {
     this.nullableArray = nullableArray;
   }
@@ -107,7 +107,7 @@ public ByteArrayObject normalArray(@jakarta.annotation.Nullable byte[] normalArr
    * @return normalArray
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NORMAL_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NORMAL_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public byte[] getNormalArray() {
@@ -115,7 +115,7 @@ public byte[] getNormalArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NORMAL_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NORMAL_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNormalArray(@jakarta.annotation.Nullable byte[] normalArray) {
     this.normalArray = normalArray;
@@ -138,14 +138,14 @@ public String getNullableString() {
         return nullableString.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableString_JsonNullable() {
     return nullableString;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_STRING, required = false)
   public void setNullableString_JsonNullable(JsonNullable<String> nullableString) {
     this.nullableString = nullableString;
   }
@@ -165,7 +165,7 @@ public ByteArrayObject stringField(@jakarta.annotation.Nullable String stringFie
    * @return stringField
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING_FIELD)
+  @JsonProperty(value = JSON_PROPERTY_STRING_FIELD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getStringField() {
@@ -173,7 +173,7 @@ public String getStringField() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_FIELD)
+  @JsonProperty(value = JSON_PROPERTY_STRING_FIELD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStringField(@jakarta.annotation.Nullable String stringField) {
     this.stringField = stringField;
@@ -190,7 +190,7 @@ public ByteArrayObject intField(@jakarta.annotation.Nullable BigDecimal intField
    * @return intField
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT_FIELD)
+  @JsonProperty(value = JSON_PROPERTY_INT_FIELD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getIntField() {
@@ -198,7 +198,7 @@ public BigDecimal getIntField() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT_FIELD)
+  @JsonProperty(value = JSON_PROPERTY_INT_FIELD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIntField(@jakarta.annotation.Nullable BigDecimal intField) {
     this.intField = intField;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index b76f213803d4..78de2d4bd385 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -66,7 +66,7 @@ public AdditionalPropertiesClass putMapPropertyItem(String key, String mapProper
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -74,7 +74,7 @@ public Map<String, String> getMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@jakarta.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -100,7 +100,7 @@ public AdditionalPropertiesClass putMapOfMapPropertyItem(String key, Map<String,
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -108,7 +108,7 @@ public Map<String, Map<String, String>> getMapOfMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 899144ebff6a..37d0f02647dd 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -57,7 +57,7 @@ public AllOfWithSingleRef username(@jakarta.annotation.Nullable String username)
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -65,7 +65,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -83,7 +83,7 @@ public AllOfWithSingleRef singleRefType(@jakarta.annotation.Nullable SingleRefTy
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -91,7 +91,7 @@ public SingleRefType getSingleRefType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@jakarta.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Animal.java
index 6961bea23a1e..35006080c8cd 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Animal.java
@@ -69,7 +69,7 @@ public Animal className(@jakarta.annotation.Nonnull String className) {
    */
   @jakarta.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -77,7 +77,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
@@ -95,7 +95,7 @@ public Animal color(@jakarta.annotation.Nullable String color) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -103,7 +103,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@jakarta.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 28c17b82e3c9..828ac5d5510a 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -63,7 +63,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -71,7 +71,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@jakarta.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index d2317cddaa6e..72d800a782b3 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -63,7 +63,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -71,7 +71,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@jakarta.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayTest.java
index d59d74aff6a6..a92d75e22427 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -73,7 +73,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -81,7 +81,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@jakarta.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -107,7 +107,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -115,7 +115,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@jakarta.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -141,7 +141,7 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -149,7 +149,7 @@ public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@jakarta.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Capitalization.java
index 06736234c84c..42aab96c9776 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -76,7 +76,7 @@ public Capitalization smallCamel(@jakarta.annotation.Nullable String smallCamel)
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -84,7 +84,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@jakarta.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -102,7 +102,7 @@ public Capitalization capitalCamel(@jakarta.annotation.Nullable String capitalCa
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -110,7 +110,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@jakarta.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -128,7 +128,7 @@ public Capitalization smallSnake(@jakarta.annotation.Nullable String smallSnake)
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -136,7 +136,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@jakarta.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -154,7 +154,7 @@ public Capitalization capitalSnake(@jakarta.annotation.Nullable String capitalSn
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -162,7 +162,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@jakarta.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -180,7 +180,7 @@ public Capitalization scAETHFlowPoints(@jakarta.annotation.Nullable String scAET
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -188,7 +188,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@jakarta.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -206,7 +206,7 @@ public Capitalization ATT_NAME(@jakarta.annotation.Nullable String ATT_NAME) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "Name of the pet ")
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -214,7 +214,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@jakarta.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Cat.java
index 7f64775e9310..bddff7ea50ad 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Cat.java
@@ -62,7 +62,7 @@ public Cat declawed(@jakarta.annotation.Nullable Boolean declawed) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -70,7 +70,7 @@ public Boolean getDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@jakarta.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Category.java
index 3bf9e6ba18b2..7903dd497c9d 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Category.java
@@ -56,7 +56,7 @@ public Category id(@jakarta.annotation.Nullable Long id) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -64,7 +64,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -82,7 +82,7 @@ public Category name(@jakarta.annotation.Nonnull String name) {
    */
   @jakarta.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -90,7 +90,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index a200e9e71207..9c81e3b7d9f7 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -63,7 +63,7 @@ public ChildWithNullable otherProperty(@jakarta.annotation.Nullable String other
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -71,7 +71,7 @@ public String getOtherProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@jakarta.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ClassModel.java
index 6594b8a81407..8f06d75ac937 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -52,7 +52,7 @@ public ClassModel propertyClass(@jakarta.annotation.Nullable String propertyClas
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -60,7 +60,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Client.java
index 08b47be84d82..5f5d454b9d14 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Client.java
@@ -51,7 +51,7 @@ public Client client(@jakarta.annotation.Nullable String client) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -59,7 +59,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@jakarta.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index ab553f556a59..19443ccd7361 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -53,7 +53,7 @@ public DeprecatedObject name(@jakarta.annotation.Nullable String name) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -61,7 +61,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Dog.java
index d723acf0dfd3..780cd1406cf7 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Dog.java
@@ -62,7 +62,7 @@ public Dog breed(@jakarta.annotation.Nullable String breed) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -70,7 +70,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@jakarta.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/EnumArrays.java
index 8d3e0ad4761d..e826d8a8faef 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -129,7 +129,7 @@ public EnumArrays justSymbol(@jakarta.annotation.Nullable JustSymbolEnum justSym
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -137,7 +137,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@jakarta.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -163,7 +163,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -171,7 +171,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@jakarta.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/EnumTest.java
index 0b4febd30a42..73abd4d8aef2 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -239,7 +239,7 @@ public EnumTest enumString(@jakarta.annotation.Nullable EnumStringEnum enumStrin
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -247,7 +247,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@jakarta.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -265,7 +265,7 @@ public EnumTest enumStringRequired(@jakarta.annotation.Nonnull EnumStringRequire
    */
   @jakarta.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -273,7 +273,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@jakarta.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -291,7 +291,7 @@ public EnumTest enumInteger(@jakarta.annotation.Nullable EnumIntegerEnum enumInt
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -299,7 +299,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@jakarta.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -317,7 +317,7 @@ public EnumTest enumNumber(@jakarta.annotation.Nullable EnumNumberEnum enumNumbe
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -325,7 +325,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@jakarta.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -349,14 +349,14 @@ public OuterEnum getOuterEnum() {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
     return outerEnum;
   }
   
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   public void setOuterEnum_JsonNullable(JsonNullable<OuterEnum> outerEnum) {
     this.outerEnum = outerEnum;
   }
@@ -377,7 +377,7 @@ public EnumTest outerEnumInteger(@jakarta.annotation.Nullable OuterEnumInteger o
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -385,7 +385,7 @@ public OuterEnumInteger getOuterEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@jakarta.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -403,7 +403,7 @@ public EnumTest outerEnumDefaultValue(@jakarta.annotation.Nullable OuterEnumDefa
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -411,7 +411,7 @@ public OuterEnumDefaultValue getOuterEnumDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@jakarta.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -429,7 +429,7 @@ public EnumTest outerEnumIntegerDefaultValue(@jakarta.annotation.Nullable OuterE
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -437,7 +437,7 @@ public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@jakarta.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 216131a443b3..1318b1d2fae9 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -60,7 +60,7 @@ public FakeBigDecimalMap200Response someId(@jakarta.annotation.Nullable BigDecim
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -68,7 +68,7 @@ public BigDecimal getSomeId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@jakarta.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -94,7 +94,7 @@ public FakeBigDecimalMap200Response putSomeMapItem(String key, BigDecimal someMa
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -102,7 +102,7 @@ public Map<String, BigDecimal> getSomeMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@jakarta.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index a2a533b8ca8e..58e50940313b 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -60,7 +60,7 @@ public FileSchemaTestClass _file(@jakarta.annotation.Nullable ModelFile _file) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -68,7 +68,7 @@ public ModelFile getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@jakarta.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -94,7 +94,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -102,7 +102,7 @@ public List<ModelFile> getFiles() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@jakarta.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Foo.java
index a87cc8312cd8..0eb6ab23e9e9 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Foo.java
@@ -51,7 +51,7 @@ public Foo bar(@jakarta.annotation.Nullable String bar) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -59,7 +59,7 @@ public String getBar() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@jakarta.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 7f366c2b6b92..afa3697a0a52 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -53,7 +53,7 @@ public FooGetDefaultResponse string(@jakarta.annotation.Nullable Foo string) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -61,7 +61,7 @@ public Foo getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FormatTest.java
index 9fa53df387e2..278178683cb5 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -134,7 +134,7 @@ public FormatTest integer(@jakarta.annotation.Nullable Integer integer) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -142,7 +142,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@jakarta.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -162,7 +162,7 @@ public FormatTest int32(@jakarta.annotation.Nullable Integer int32) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -170,7 +170,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@jakarta.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -188,7 +188,7 @@ public FormatTest int64(@jakarta.annotation.Nullable Long int64) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -196,7 +196,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@jakarta.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -216,7 +216,7 @@ public FormatTest number(@jakarta.annotation.Nonnull BigDecimal number) {
    */
   @jakarta.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -224,7 +224,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@jakarta.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -244,7 +244,7 @@ public FormatTest _float(@jakarta.annotation.Nullable Float _float) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -252,7 +252,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@jakarta.annotation.Nullable Float _float) {
     this._float = _float;
@@ -272,7 +272,7 @@ public FormatTest _double(@jakarta.annotation.Nullable Double _double) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -280,7 +280,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@jakarta.annotation.Nullable Double _double) {
     this._double = _double;
@@ -298,7 +298,7 @@ public FormatTest decimal(@jakarta.annotation.Nullable BigDecimal decimal) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -306,7 +306,7 @@ public BigDecimal getDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@jakarta.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -324,7 +324,7 @@ public FormatTest string(@jakarta.annotation.Nullable String string) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -332,7 +332,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable String string) {
     this.string = string;
@@ -350,7 +350,7 @@ public FormatTest _byte(@jakarta.annotation.Nonnull byte[] _byte) {
    */
   @jakarta.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -358,7 +358,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@jakarta.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -376,7 +376,7 @@ public FormatTest binary(@jakarta.annotation.Nullable File binary) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -384,7 +384,7 @@ public File getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@jakarta.annotation.Nullable File binary) {
     this.binary = binary;
@@ -402,7 +402,7 @@ public FormatTest date(@jakarta.annotation.Nonnull LocalDate date) {
    */
   @jakarta.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -410,7 +410,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@jakarta.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -428,7 +428,7 @@ public FormatTest dateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime)
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -436,7 +436,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -454,7 +454,7 @@ public FormatTest uuid(@jakarta.annotation.Nullable UUID uuid) {
    */
   @jakarta.annotation.Nullable
   @Schema(example = "72f98069-206d-4f12-9f12-3d1e525a8e84", requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -462,7 +462,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -480,7 +480,7 @@ public FormatTest password(@jakarta.annotation.Nonnull String password) {
    */
   @jakarta.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -488,7 +488,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@jakarta.annotation.Nonnull String password) {
     this.password = password;
@@ -506,7 +506,7 @@ public FormatTest patternWithDigits(@jakarta.annotation.Nullable String patternW
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "A string that is a 10 digit number. Can have leading zeros.")
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -514,7 +514,7 @@ public String getPatternWithDigits() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@jakarta.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -532,7 +532,7 @@ public FormatTest patternWithDigitsAndDelimiter(@jakarta.annotation.Nullable Str
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "A string starting with 'image_' (case insensitive) and one to three digits following i.e. Image_01.")
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -540,7 +540,7 @@ public String getPatternWithDigitsAndDelimiter() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@jakarta.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 059ed484d17a..2f24b66c2901 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -49,8 +49,8 @@ public HasOnlyReadOnly() {
    */
   @JsonCreator
   public HasOnlyReadOnly(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar, 
-    @JsonProperty(JSON_PROPERTY_FOO) String foo
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar, 
+    @JsonProperty(value = JSON_PROPERTY_FOO, required = false) String foo
   ) {
     this();
     this.bar = bar;
@@ -63,7 +63,7 @@ public HasOnlyReadOnly(
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -78,7 +78,7 @@ public String getBar() {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 25eb05c4adcc..de2d71e17269 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -62,14 +62,14 @@ public String getNullableMessage() {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
     return nullableMessage;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   public void setNullableMessage_JsonNullable(JsonNullable<String> nullableMessage) {
     this.nullableMessage = nullableMessage;
   }
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/MapTest.java
index 02bdbf0e9179..18dd2dea377e 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/MapTest.java
@@ -111,7 +111,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -119,7 +119,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -145,7 +145,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -153,7 +153,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@jakarta.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -179,7 +179,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -187,7 +187,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@jakarta.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -213,7 +213,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -221,7 +221,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@jakarta.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 658629f95904..0f658d47c758 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -66,7 +66,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@jakarta.annotation.Null
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -74,7 +74,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -92,7 +92,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@jakarta.annotation.
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -100,7 +100,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -126,7 +126,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -134,7 +134,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@jakarta.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Model200Response.java
index 201305fe0cc8..c013a3782def 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -58,7 +58,7 @@ public Model200Response name(@jakarta.annotation.Nullable Integer name) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -66,7 +66,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable Integer name) {
     this.name = name;
@@ -84,7 +84,7 @@ public Model200Response propertyClass(@jakarta.annotation.Nullable String proper
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -92,7 +92,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index de3da16b0bc5..73910d66b9ea 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -62,7 +62,7 @@ public ModelApiResponse code(@jakarta.annotation.Nullable Integer code) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -70,7 +70,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@jakarta.annotation.Nullable Integer code) {
     this.code = code;
@@ -88,7 +88,7 @@ public ModelApiResponse type(@jakarta.annotation.Nullable String type) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -96,7 +96,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable String type) {
     this.type = type;
@@ -114,7 +114,7 @@ public ModelApiResponse message(@jakarta.annotation.Nullable String message) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -122,7 +122,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@jakarta.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelFile.java
index e896bb11b5fc..a544f487e757 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -53,7 +53,7 @@ public ModelFile sourceURI(@jakarta.annotation.Nullable String sourceURI) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "Test capitalization")
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -61,7 +61,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@jakarta.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelList.java
index afd9fd555e8a..7c28a4e41379 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelList.java
@@ -52,7 +52,7 @@ public ModelList _123list(@jakarta.annotation.Nullable String _123list) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -60,7 +60,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@jakarta.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelReturn.java
index efab0f552d90..b6c620af10f1 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -53,7 +53,7 @@ public ModelReturn _return(@jakarta.annotation.Nullable Integer _return) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -61,7 +61,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@jakarta.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Name.java
index c8deac2d684b..5704f82f4155 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Name.java
@@ -59,8 +59,8 @@ public Name() {
    */
   @JsonCreator
   public Name(
-    @JsonProperty(JSON_PROPERTY_SNAKE_CASE) Integer snakeCase, 
-    @JsonProperty(JSON_PROPERTY_123NUMBER) Integer _123number
+    @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false) Integer snakeCase, 
+    @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false) Integer _123number
   ) {
     this();
     this.snakeCase = snakeCase;
@@ -79,7 +79,7 @@ public Name name(@jakarta.annotation.Nonnull Integer name) {
    */
   @jakarta.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -87,7 +87,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull Integer name) {
     this.name = name;
@@ -99,7 +99,7 @@ public void setName(@jakarta.annotation.Nonnull Integer name) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -120,7 +120,7 @@ public Name property(@jakarta.annotation.Nullable String property) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -128,7 +128,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@jakarta.annotation.Nullable String property) {
     this.property = property;
@@ -140,7 +140,7 @@ public void setProperty(@jakarta.annotation.Nullable String property) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/NullableClass.java
index b728b80401d2..52ef36b009fe 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -125,14 +125,14 @@ public Integer getIntegerProp() {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
     return integerProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   public void setIntegerProp_JsonNullable(JsonNullable<Integer> integerProp) {
     this.integerProp = integerProp;
   }
@@ -159,14 +159,14 @@ public BigDecimal getNumberProp() {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
     return numberProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   public void setNumberProp_JsonNullable(JsonNullable<BigDecimal> numberProp) {
     this.numberProp = numberProp;
   }
@@ -193,14 +193,14 @@ public Boolean getBooleanProp() {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
     return booleanProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   public void setBooleanProp_JsonNullable(JsonNullable<Boolean> booleanProp) {
     this.booleanProp = booleanProp;
   }
@@ -227,14 +227,14 @@ public String getStringProp() {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
     return stringProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   public void setStringProp_JsonNullable(JsonNullable<String> stringProp) {
     this.stringProp = stringProp;
   }
@@ -261,14 +261,14 @@ public LocalDate getDateProp() {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
     return dateProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   public void setDateProp_JsonNullable(JsonNullable<LocalDate> dateProp) {
     this.dateProp = dateProp;
   }
@@ -295,14 +295,14 @@ public OffsetDateTime getDatetimeProp() {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
     return datetimeProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   public void setDatetimeProp_JsonNullable(JsonNullable<OffsetDateTime> datetimeProp) {
     this.datetimeProp = datetimeProp;
   }
@@ -341,14 +341,14 @@ public List<Object> getArrayNullableProp() {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
     return arrayNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   public void setArrayNullableProp_JsonNullable(JsonNullable<List<Object>> arrayNullableProp) {
     this.arrayNullableProp = arrayNullableProp;
   }
@@ -387,14 +387,14 @@ public List<Object> getArrayAndItemsNullableProp() {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
     return arrayAndItemsNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   public void setArrayAndItemsNullableProp_JsonNullable(JsonNullable<List<Object>> arrayAndItemsNullableProp) {
     this.arrayAndItemsNullableProp = arrayAndItemsNullableProp;
   }
@@ -423,7 +423,7 @@ public NullableClass addArrayItemsNullableItem(Object arrayItemsNullableItem) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -431,7 +431,7 @@ public List<Object> getArrayItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@jakarta.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -467,14 +467,14 @@ public Map<String, Object> getObjectNullableProp() {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
     return objectNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   public void setObjectNullableProp_JsonNullable(JsonNullable<Map<String, Object>> objectNullableProp) {
     this.objectNullableProp = objectNullableProp;
   }
@@ -513,14 +513,14 @@ public Map<String, Object> getObjectAndItemsNullableProp() {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
     return objectAndItemsNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   public void setObjectAndItemsNullableProp_JsonNullable(JsonNullable<Map<String, Object>> objectAndItemsNullableProp) {
     this.objectAndItemsNullableProp = objectAndItemsNullableProp;
   }
@@ -549,7 +549,7 @@ public NullableClass putObjectItemsNullableItem(String key, Object objectItemsNu
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -557,7 +557,7 @@ public Map<String, Object> getObjectItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@jakarta.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/NumberOnly.java
index db64d2c453aa..6d3fa4b518c3 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -52,7 +52,7 @@ public NumberOnly justNumber(@jakarta.annotation.Nullable BigDecimal justNumber)
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -60,7 +60,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@jakarta.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index c51ffd9aa205..78fc3ffb63a5 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -71,7 +71,7 @@ public ObjectWithDeprecatedFields uuid(@jakarta.annotation.Nullable String uuid)
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -79,7 +79,7 @@ public String getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -99,7 +99,7 @@ public ObjectWithDeprecatedFields id(@jakarta.annotation.Nullable BigDecimal id)
   @Deprecated
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -107,7 +107,7 @@ public BigDecimal getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -127,7 +127,7 @@ public ObjectWithDeprecatedFields deprecatedRef(@jakarta.annotation.Nullable Dep
   @Deprecated
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -135,7 +135,7 @@ public DeprecatedObject getDeprecatedRef() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@jakarta.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -163,7 +163,7 @@ public ObjectWithDeprecatedFields addBarsItem(String barsItem) {
   @Deprecated
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -171,7 +171,7 @@ public List<String> getBars() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@jakarta.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Order.java
index 70c28eab2d63..10bc5e85abe2 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Order.java
@@ -114,7 +114,7 @@ public Order id(@jakarta.annotation.Nullable Long id) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -122,7 +122,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -140,7 +140,7 @@ public Order petId(@jakarta.annotation.Nullable Long petId) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -148,7 +148,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@jakarta.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -166,7 +166,7 @@ public Order quantity(@jakarta.annotation.Nullable Integer quantity) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -174,7 +174,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@jakarta.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -192,7 +192,7 @@ public Order shipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -200,7 +200,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -218,7 +218,7 @@ public Order status(@jakarta.annotation.Nullable StatusEnum status) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "Order Status")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -226,7 +226,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -244,7 +244,7 @@ public Order complete(@jakarta.annotation.Nullable Boolean complete) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -252,7 +252,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@jakarta.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/OuterComposite.java
index bb38603d6199..5e894af1a380 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -62,7 +62,7 @@ public OuterComposite myNumber(@jakarta.annotation.Nullable BigDecimal myNumber)
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -70,7 +70,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@jakarta.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -88,7 +88,7 @@ public OuterComposite myString(@jakarta.annotation.Nullable String myString) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -96,7 +96,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@jakarta.annotation.Nullable String myString) {
     this.myString = myString;
@@ -114,7 +114,7 @@ public OuterComposite myBoolean(@jakarta.annotation.Nullable Boolean myBoolean)
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -122,7 +122,7 @@ public Boolean getMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@jakarta.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 5fe9a3405882..f2436c6d1c8c 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -52,7 +52,7 @@ public OuterObjectWithEnumProperty value(@jakarta.annotation.Nonnull OuterEnumIn
    */
   @jakarta.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -60,7 +60,7 @@ public OuterEnumInteger getValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@jakarta.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index 90608d1d29e1..12be55146782 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -105,7 +105,7 @@ public ParentWithNullable type(@jakarta.annotation.Nullable TypeEnum type) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -113,7 +113,7 @@ public TypeEnum getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -137,14 +137,14 @@ public String getNullableProperty() {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
     return nullableProperty;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   public void setNullableProperty_JsonNullable(JsonNullable<String> nullableProperty) {
     this.nullableProperty = nullableProperty;
   }
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Pet.java
index c51cfdbd0e9d..394a3d989fb6 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Pet.java
@@ -121,7 +121,7 @@ public Pet id(@jakarta.annotation.Nullable Long id) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -129,7 +129,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -147,7 +147,7 @@ public Pet category(@jakarta.annotation.Nullable Category category) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -155,7 +155,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@jakarta.annotation.Nullable Category category) {
     this.category = category;
@@ -173,7 +173,7 @@ public Pet name(@jakarta.annotation.Nonnull String name) {
    */
   @jakarta.annotation.Nonnull
   @Schema(example = "doggie", requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -181,7 +181,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
@@ -207,7 +207,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    */
   @jakarta.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -216,7 +216,7 @@ public Set<String> getPhotoUrls() {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@jakarta.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -242,7 +242,7 @@ public Pet addTagsItem(Tag tagsItem) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -250,7 +250,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@jakarta.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -268,7 +268,7 @@ public Pet status(@jakarta.annotation.Nullable StatusEnum status) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "pet status in the store")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -276,7 +276,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index b6726d56cc03..113432d86f36 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -48,7 +48,7 @@ public ReadOnlyFirst() {
    */
   @JsonCreator
   public ReadOnlyFirst(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar
   ) {
     this();
     this.bar = bar;
@@ -60,7 +60,7 @@ public ReadOnlyFirst(
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -81,7 +81,7 @@ public ReadOnlyFirst baz(@jakarta.annotation.Nullable String baz) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -89,7 +89,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@jakarta.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/SpecialModelName.java
index facdb1dc752b..2eb2923ae38d 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -52,7 +52,7 @@ public SpecialModelName() {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -60,7 +60,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@jakarta.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Tag.java
index 56883c60ebd4..fd7800fd5cea 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Tag.java
@@ -56,7 +56,7 @@ public Tag id(@jakarta.annotation.Nullable Long id) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -64,7 +64,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -82,7 +82,7 @@ public Tag name(@jakarta.annotation.Nullable String name) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -90,7 +90,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index e6f40c01ceb9..5535699bc2e8 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -55,7 +55,7 @@ public TestInlineFreeformAdditionalPropertiesRequest someProperty(@jakarta.annot
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -63,7 +63,7 @@ public String getSomeProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@jakarta.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/User.java
index 60428f12e1b7..f4b32dc9988c 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/User.java
@@ -86,7 +86,7 @@ public User id(@jakarta.annotation.Nullable Long id) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -94,7 +94,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -112,7 +112,7 @@ public User username(@jakarta.annotation.Nullable String username) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -120,7 +120,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -138,7 +138,7 @@ public User firstName(@jakarta.annotation.Nullable String firstName) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -146,7 +146,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@jakarta.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -164,7 +164,7 @@ public User lastName(@jakarta.annotation.Nullable String lastName) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -172,7 +172,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@jakarta.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -190,7 +190,7 @@ public User email(@jakarta.annotation.Nullable String email) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -198,7 +198,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@jakarta.annotation.Nullable String email) {
     this.email = email;
@@ -216,7 +216,7 @@ public User password(@jakarta.annotation.Nullable String password) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -224,7 +224,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@jakarta.annotation.Nullable String password) {
     this.password = password;
@@ -242,7 +242,7 @@ public User phone(@jakarta.annotation.Nullable String phone) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -250,7 +250,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@jakarta.annotation.Nullable String phone) {
     this.phone = phone;
@@ -268,7 +268,7 @@ public User userStatus(@jakarta.annotation.Nullable Integer userStatus) {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "User Status")
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -276,7 +276,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@jakarta.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 56f1fe0938fd..774d9b02a9b7 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -64,7 +64,7 @@ public AdditionalPropertiesClass putMapPropertyItem(String key, String mapProper
    * @return mapProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -72,7 +72,7 @@ public Map<String, String> getMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@jakarta.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -97,7 +97,7 @@ public AdditionalPropertiesClass putMapOfMapPropertyItem(String key, Map<String,
    * @return mapOfMapProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -105,7 +105,7 @@ public Map<String, Map<String, String>> getMapOfMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 9eb8a5828740..533bc0516cf4 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -55,7 +55,7 @@ public AllOfWithSingleRef username(@jakarta.annotation.Nullable String username)
    * @return username
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -63,7 +63,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -80,7 +80,7 @@ public AllOfWithSingleRef singleRefType(@jakarta.annotation.Nullable SingleRefTy
    * @return singleRefType
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -88,7 +88,7 @@ public SingleRefType getSingleRefType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@jakarta.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Animal.java
index 29e7a29744b1..047a851fccf7 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Animal.java
@@ -67,7 +67,7 @@ public Animal className(@jakarta.annotation.Nonnull String className) {
    * @return className
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -75,7 +75,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
@@ -92,7 +92,7 @@ public Animal color(@jakarta.annotation.Nullable String color) {
    * @return color
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -100,7 +100,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@jakarta.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 11d53ebba68f..14f834bb4965 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -61,7 +61,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    * @return arrayArrayNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -69,7 +69,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@jakarta.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 89737c3a11a3..08f6c05b1967 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -61,7 +61,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    * @return arrayNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -69,7 +69,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@jakarta.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayTest.java
index d13ff4b24037..a13d3314b69d 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -71,7 +71,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    * @return arrayOfString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -79,7 +79,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@jakarta.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -104,7 +104,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    * @return arrayArrayOfInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -112,7 +112,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@jakarta.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -137,7 +137,7 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    * @return arrayArrayOfModel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -145,7 +145,7 @@ public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@jakarta.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Capitalization.java
index bb010e6733b0..e0a48eaef0d1 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -74,7 +74,7 @@ public Capitalization smallCamel(@jakarta.annotation.Nullable String smallCamel)
    * @return smallCamel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -82,7 +82,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@jakarta.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -99,7 +99,7 @@ public Capitalization capitalCamel(@jakarta.annotation.Nullable String capitalCa
    * @return capitalCamel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -107,7 +107,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@jakarta.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -124,7 +124,7 @@ public Capitalization smallSnake(@jakarta.annotation.Nullable String smallSnake)
    * @return smallSnake
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -132,7 +132,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@jakarta.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -149,7 +149,7 @@ public Capitalization capitalSnake(@jakarta.annotation.Nullable String capitalSn
    * @return capitalSnake
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -157,7 +157,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@jakarta.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -174,7 +174,7 @@ public Capitalization scAETHFlowPoints(@jakarta.annotation.Nullable String scAET
    * @return scAETHFlowPoints
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -182,7 +182,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@jakarta.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -199,7 +199,7 @@ public Capitalization ATT_NAME(@jakarta.annotation.Nullable String ATT_NAME) {
    * @return ATT_NAME
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -207,7 +207,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@jakarta.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Cat.java
index 4773aae3302e..b71fd7840dff 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Cat.java
@@ -60,7 +60,7 @@ public Cat declawed(@jakarta.annotation.Nullable Boolean declawed) {
    * @return declawed
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -68,7 +68,7 @@ public Boolean getDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@jakarta.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Category.java
index f2866299d350..9e6c1ab26a73 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Category.java
@@ -54,7 +54,7 @@ public Category id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Category name(@jakarta.annotation.Nonnull String name) {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index a87ebb3f8d4b..f8d891cd768a 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -61,7 +61,7 @@ public ChildWithNullable otherProperty(@jakarta.annotation.Nullable String other
    * @return otherProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -69,7 +69,7 @@ public String getOtherProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@jakarta.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ClassModel.java
index 593b76dba904..db366f297b8c 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -49,7 +49,7 @@ public ClassModel propertyClass(@jakarta.annotation.Nullable String propertyClas
    * @return propertyClass
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -57,7 +57,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Client.java
index df320aff56c2..97b0281e1432 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Client.java
@@ -49,7 +49,7 @@ public Client client(@jakarta.annotation.Nullable String client) {
    * @return client
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -57,7 +57,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@jakarta.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 4952170c8278..09e2849033ea 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -51,7 +51,7 @@ public DeprecatedObject name(@jakarta.annotation.Nullable String name) {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -59,7 +59,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Dog.java
index fef00ec1ebe5..c36849edc666 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Dog.java
@@ -60,7 +60,7 @@ public Dog breed(@jakarta.annotation.Nullable String breed) {
    * @return breed
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -68,7 +68,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@jakarta.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumArrays.java
index 4b338bd60054..d2038e29e9bf 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -127,7 +127,7 @@ public EnumArrays justSymbol(@jakarta.annotation.Nullable JustSymbolEnum justSym
    * @return justSymbol
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -135,7 +135,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@jakarta.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -160,7 +160,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    * @return arrayEnum
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -168,7 +168,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@jakarta.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumTest.java
index 95f2dbb21bc6..01e8d87d5fc9 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -237,7 +237,7 @@ public EnumTest enumString(@jakarta.annotation.Nullable EnumStringEnum enumStrin
    * @return enumString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -245,7 +245,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@jakarta.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -262,7 +262,7 @@ public EnumTest enumStringRequired(@jakarta.annotation.Nonnull EnumStringRequire
    * @return enumStringRequired
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -270,7 +270,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@jakarta.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -287,7 +287,7 @@ public EnumTest enumInteger(@jakarta.annotation.Nullable EnumIntegerEnum enumInt
    * @return enumInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -295,7 +295,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@jakarta.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -312,7 +312,7 @@ public EnumTest enumNumber(@jakarta.annotation.Nullable EnumNumberEnum enumNumbe
    * @return enumNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -320,7 +320,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@jakarta.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -343,14 +343,14 @@ public OuterEnum getOuterEnum() {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
     return outerEnum;
   }
   
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   public void setOuterEnum_JsonNullable(JsonNullable<OuterEnum> outerEnum) {
     this.outerEnum = outerEnum;
   }
@@ -370,7 +370,7 @@ public EnumTest outerEnumInteger(@jakarta.annotation.Nullable OuterEnumInteger o
    * @return outerEnumInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -378,7 +378,7 @@ public OuterEnumInteger getOuterEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@jakarta.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -395,7 +395,7 @@ public EnumTest outerEnumDefaultValue(@jakarta.annotation.Nullable OuterEnumDefa
    * @return outerEnumDefaultValue
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -403,7 +403,7 @@ public OuterEnumDefaultValue getOuterEnumDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@jakarta.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -420,7 +420,7 @@ public EnumTest outerEnumIntegerDefaultValue(@jakarta.annotation.Nullable OuterE
    * @return outerEnumIntegerDefaultValue
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -428,7 +428,7 @@ public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@jakarta.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index c8aab786b084..ca6f7ea85a54 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -58,7 +58,7 @@ public FakeBigDecimalMap200Response someId(@jakarta.annotation.Nullable BigDecim
    * @return someId
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -66,7 +66,7 @@ public BigDecimal getSomeId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@jakarta.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -91,7 +91,7 @@ public FakeBigDecimalMap200Response putSomeMapItem(String key, BigDecimal someMa
    * @return someMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -99,7 +99,7 @@ public Map<String, BigDecimal> getSomeMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@jakarta.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 70d5cbdc8a12..b01a8cc6a650 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -58,7 +58,7 @@ public FileSchemaTestClass _file(@jakarta.annotation.Nullable ModelFile _file) {
    * @return _file
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -66,7 +66,7 @@ public ModelFile getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@jakarta.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -91,7 +91,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
    * @return files
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -99,7 +99,7 @@ public List<ModelFile> getFiles() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@jakarta.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Foo.java
index c65cfef18961..a1ed20f42d37 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Foo.java
@@ -49,7 +49,7 @@ public Foo bar(@jakarta.annotation.Nullable String bar) {
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -57,7 +57,7 @@ public String getBar() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@jakarta.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 566afef3ebf9..f5cbca8e2ebe 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -51,7 +51,7 @@ public FooGetDefaultResponse string(@jakarta.annotation.Nullable Foo string) {
    * @return string
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -59,7 +59,7 @@ public Foo getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FormatTest.java
index 4a2c7b6f1682..74d5fa6d41ee 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -132,7 +132,7 @@ public FormatTest integer(@jakarta.annotation.Nullable Integer integer) {
    * @return integer
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -140,7 +140,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@jakarta.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -159,7 +159,7 @@ public FormatTest int32(@jakarta.annotation.Nullable Integer int32) {
    * @return int32
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -167,7 +167,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@jakarta.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -184,7 +184,7 @@ public FormatTest int64(@jakarta.annotation.Nullable Long int64) {
    * @return int64
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -192,7 +192,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@jakarta.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -211,7 +211,7 @@ public FormatTest number(@jakarta.annotation.Nonnull BigDecimal number) {
    * @return number
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -219,7 +219,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@jakarta.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -238,7 +238,7 @@ public FormatTest _float(@jakarta.annotation.Nullable Float _float) {
    * @return _float
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -246,7 +246,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@jakarta.annotation.Nullable Float _float) {
     this._float = _float;
@@ -265,7 +265,7 @@ public FormatTest _double(@jakarta.annotation.Nullable Double _double) {
    * @return _double
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -273,7 +273,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@jakarta.annotation.Nullable Double _double) {
     this._double = _double;
@@ -290,7 +290,7 @@ public FormatTest decimal(@jakarta.annotation.Nullable BigDecimal decimal) {
    * @return decimal
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -298,7 +298,7 @@ public BigDecimal getDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@jakarta.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -315,7 +315,7 @@ public FormatTest string(@jakarta.annotation.Nullable String string) {
    * @return string
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -323,7 +323,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable String string) {
     this.string = string;
@@ -340,7 +340,7 @@ public FormatTest _byte(@jakarta.annotation.Nonnull byte[] _byte) {
    * @return _byte
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -348,7 +348,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@jakarta.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -365,7 +365,7 @@ public FormatTest binary(@jakarta.annotation.Nullable File binary) {
    * @return binary
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -373,7 +373,7 @@ public File getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@jakarta.annotation.Nullable File binary) {
     this.binary = binary;
@@ -390,7 +390,7 @@ public FormatTest date(@jakarta.annotation.Nonnull LocalDate date) {
    * @return date
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -398,7 +398,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@jakarta.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -415,7 +415,7 @@ public FormatTest dateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime)
    * @return dateTime
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -423,7 +423,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -440,7 +440,7 @@ public FormatTest uuid(@jakarta.annotation.Nullable UUID uuid) {
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -448,7 +448,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -465,7 +465,7 @@ public FormatTest password(@jakarta.annotation.Nonnull String password) {
    * @return password
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -473,7 +473,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@jakarta.annotation.Nonnull String password) {
     this.password = password;
@@ -490,7 +490,7 @@ public FormatTest patternWithDigits(@jakarta.annotation.Nullable String patternW
    * @return patternWithDigits
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -498,7 +498,7 @@ public String getPatternWithDigits() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@jakarta.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -515,7 +515,7 @@ public FormatTest patternWithDigitsAndDelimiter(@jakarta.annotation.Nullable Str
    * @return patternWithDigitsAndDelimiter
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -523,7 +523,7 @@ public String getPatternWithDigitsAndDelimiter() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@jakarta.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 54024338b2be..0f6c6317185e 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -48,8 +48,8 @@ public HasOnlyReadOnly() {
    */
   @JsonCreator
   public HasOnlyReadOnly(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar, 
-    @JsonProperty(JSON_PROPERTY_FOO) String foo
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar, 
+    @JsonProperty(value = JSON_PROPERTY_FOO, required = false) String foo
   ) {
     this();
     this.bar = bar;
@@ -61,7 +61,7 @@ public HasOnlyReadOnly(
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -75,7 +75,7 @@ public String getBar() {
    * @return foo
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 0bdb79a0239f..006694645085 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -59,14 +59,14 @@ public String getNullableMessage() {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
     return nullableMessage;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   public void setNullableMessage_JsonNullable(JsonNullable<String> nullableMessage) {
     this.nullableMessage = nullableMessage;
   }
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MapTest.java
index 1c1faf293b63..cf04e1a69181 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MapTest.java
@@ -109,7 +109,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    * @return mapMapOfString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -117,7 +117,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -142,7 +142,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    * @return mapOfEnumString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -150,7 +150,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@jakarta.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -175,7 +175,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    * @return directMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -183,7 +183,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@jakarta.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -208,7 +208,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    * @return indirectMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -216,7 +216,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@jakarta.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 8d2192b55888..b60b24e2ead3 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -64,7 +64,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@jakarta.annotation.Null
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -72,7 +72,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -89,7 +89,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@jakarta.annotation.
    * @return dateTime
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -97,7 +97,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -122,7 +122,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    * @return map
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -130,7 +130,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@jakarta.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Model200Response.java
index 8b2f988e73ad..dc80a7a4b683 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -55,7 +55,7 @@ public Model200Response name(@jakarta.annotation.Nullable Integer name) {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -63,7 +63,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable Integer name) {
     this.name = name;
@@ -80,7 +80,7 @@ public Model200Response propertyClass(@jakarta.annotation.Nullable String proper
    * @return propertyClass
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -88,7 +88,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index ce7319bf809e..a0ef10546fc6 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -60,7 +60,7 @@ public ModelApiResponse code(@jakarta.annotation.Nullable Integer code) {
    * @return code
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -68,7 +68,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@jakarta.annotation.Nullable Integer code) {
     this.code = code;
@@ -85,7 +85,7 @@ public ModelApiResponse type(@jakarta.annotation.Nullable String type) {
    * @return type
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -93,7 +93,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable String type) {
     this.type = type;
@@ -110,7 +110,7 @@ public ModelApiResponse message(@jakarta.annotation.Nullable String message) {
    * @return message
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -118,7 +118,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@jakarta.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelFile.java
index 942c8ffced2b..911e26d08ffa 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -50,7 +50,7 @@ public ModelFile sourceURI(@jakarta.annotation.Nullable String sourceURI) {
    * @return sourceURI
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -58,7 +58,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@jakarta.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelList.java
index 8d69575c669c..04776712bced 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelList.java
@@ -50,7 +50,7 @@ public ModelList _123list(@jakarta.annotation.Nullable String _123list) {
    * @return _123list
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -58,7 +58,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@jakarta.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelReturn.java
index c23b56609afd..58636ff4976a 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -50,7 +50,7 @@ public ModelReturn _return(@jakarta.annotation.Nullable Integer _return) {
    * @return _return
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -58,7 +58,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@jakarta.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Name.java
index f43a96ccb6b4..bd501b554294 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Name.java
@@ -57,8 +57,8 @@ public Name() {
    */
   @JsonCreator
   public Name(
-    @JsonProperty(JSON_PROPERTY_SNAKE_CASE) Integer snakeCase, 
-    @JsonProperty(JSON_PROPERTY_123NUMBER) Integer _123number
+    @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false) Integer snakeCase, 
+    @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false) Integer _123number
   ) {
     this();
     this.snakeCase = snakeCase;
@@ -76,7 +76,7 @@ public Name name(@jakarta.annotation.Nonnull Integer name) {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -84,7 +84,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull Integer name) {
     this.name = name;
@@ -95,7 +95,7 @@ public void setName(@jakarta.annotation.Nonnull Integer name) {
    * @return snakeCase
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -115,7 +115,7 @@ public Name property(@jakarta.annotation.Nullable String property) {
    * @return property
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -123,7 +123,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@jakarta.annotation.Nullable String property) {
     this.property = property;
@@ -134,7 +134,7 @@ public void setProperty(@jakarta.annotation.Nullable String property) {
    * @return _123number
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NullableClass.java
index b9b4dff62870..1ede4cad4fd0 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -123,14 +123,14 @@ public Integer getIntegerProp() {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
     return integerProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   public void setIntegerProp_JsonNullable(JsonNullable<Integer> integerProp) {
     this.integerProp = integerProp;
   }
@@ -156,14 +156,14 @@ public BigDecimal getNumberProp() {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
     return numberProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   public void setNumberProp_JsonNullable(JsonNullable<BigDecimal> numberProp) {
     this.numberProp = numberProp;
   }
@@ -189,14 +189,14 @@ public Boolean getBooleanProp() {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
     return booleanProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   public void setBooleanProp_JsonNullable(JsonNullable<Boolean> booleanProp) {
     this.booleanProp = booleanProp;
   }
@@ -222,14 +222,14 @@ public String getStringProp() {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
     return stringProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   public void setStringProp_JsonNullable(JsonNullable<String> stringProp) {
     this.stringProp = stringProp;
   }
@@ -255,14 +255,14 @@ public LocalDate getDateProp() {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
     return dateProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   public void setDateProp_JsonNullable(JsonNullable<LocalDate> dateProp) {
     this.dateProp = dateProp;
   }
@@ -288,14 +288,14 @@ public OffsetDateTime getDatetimeProp() {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
     return datetimeProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   public void setDatetimeProp_JsonNullable(JsonNullable<OffsetDateTime> datetimeProp) {
     this.datetimeProp = datetimeProp;
   }
@@ -333,14 +333,14 @@ public List<Object> getArrayNullableProp() {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
     return arrayNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   public void setArrayNullableProp_JsonNullable(JsonNullable<List<Object>> arrayNullableProp) {
     this.arrayNullableProp = arrayNullableProp;
   }
@@ -378,14 +378,14 @@ public List<Object> getArrayAndItemsNullableProp() {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
     return arrayAndItemsNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   public void setArrayAndItemsNullableProp_JsonNullable(JsonNullable<List<Object>> arrayAndItemsNullableProp) {
     this.arrayAndItemsNullableProp = arrayAndItemsNullableProp;
   }
@@ -413,7 +413,7 @@ public NullableClass addArrayItemsNullableItem(Object arrayItemsNullableItem) {
    * @return arrayItemsNullable
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -421,7 +421,7 @@ public List<Object> getArrayItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@jakarta.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -456,14 +456,14 @@ public Map<String, Object> getObjectNullableProp() {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
     return objectNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   public void setObjectNullableProp_JsonNullable(JsonNullable<Map<String, Object>> objectNullableProp) {
     this.objectNullableProp = objectNullableProp;
   }
@@ -501,14 +501,14 @@ public Map<String, Object> getObjectAndItemsNullableProp() {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
     return objectAndItemsNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   public void setObjectAndItemsNullableProp_JsonNullable(JsonNullable<Map<String, Object>> objectAndItemsNullableProp) {
     this.objectAndItemsNullableProp = objectAndItemsNullableProp;
   }
@@ -536,7 +536,7 @@ public NullableClass putObjectItemsNullableItem(String key, Object objectItemsNu
    * @return objectItemsNullable
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -544,7 +544,7 @@ public Map<String, Object> getObjectItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@jakarta.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NumberOnly.java
index d08ace18e881..2776b239d592 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -50,7 +50,7 @@ public NumberOnly justNumber(@jakarta.annotation.Nullable BigDecimal justNumber)
    * @return justNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -58,7 +58,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@jakarta.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index a86ef6439426..27f507e48c46 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -69,7 +69,7 @@ public ObjectWithDeprecatedFields uuid(@jakarta.annotation.Nullable String uuid)
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -77,7 +77,7 @@ public String getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -96,7 +96,7 @@ public ObjectWithDeprecatedFields id(@jakarta.annotation.Nullable BigDecimal id)
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -104,7 +104,7 @@ public BigDecimal getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -123,7 +123,7 @@ public ObjectWithDeprecatedFields deprecatedRef(@jakarta.annotation.Nullable Dep
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -131,7 +131,7 @@ public DeprecatedObject getDeprecatedRef() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@jakarta.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -158,7 +158,7 @@ public ObjectWithDeprecatedFields addBarsItem(String barsItem) {
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -166,7 +166,7 @@ public List<String> getBars() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@jakarta.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Order.java
index b2447ba61b13..dbdc4d20d43d 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Order.java
@@ -112,7 +112,7 @@ public Order id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -120,7 +120,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -137,7 +137,7 @@ public Order petId(@jakarta.annotation.Nullable Long petId) {
    * @return petId
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -145,7 +145,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@jakarta.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -162,7 +162,7 @@ public Order quantity(@jakarta.annotation.Nullable Integer quantity) {
    * @return quantity
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -170,7 +170,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@jakarta.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -187,7 +187,7 @@ public Order shipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
    * @return shipDate
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -195,7 +195,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -212,7 +212,7 @@ public Order status(@jakarta.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -220,7 +220,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -237,7 +237,7 @@ public Order complete(@jakarta.annotation.Nullable Boolean complete) {
    * @return complete
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -245,7 +245,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@jakarta.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterComposite.java
index 2a671305cc95..679413f53253 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -60,7 +60,7 @@ public OuterComposite myNumber(@jakarta.annotation.Nullable BigDecimal myNumber)
    * @return myNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -68,7 +68,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@jakarta.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -85,7 +85,7 @@ public OuterComposite myString(@jakarta.annotation.Nullable String myString) {
    * @return myString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -93,7 +93,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@jakarta.annotation.Nullable String myString) {
     this.myString = myString;
@@ -110,7 +110,7 @@ public OuterComposite myBoolean(@jakarta.annotation.Nullable Boolean myBoolean)
    * @return myBoolean
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -118,7 +118,7 @@ public Boolean getMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@jakarta.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 3344e37f2645..c5a8a9268376 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -50,7 +50,7 @@ public OuterObjectWithEnumProperty value(@jakarta.annotation.Nonnull OuterEnumIn
    * @return value
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -58,7 +58,7 @@ public OuterEnumInteger getValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@jakarta.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index 5c13648a7c28..371bceb9b1dc 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -103,7 +103,7 @@ public ParentWithNullable type(@jakarta.annotation.Nullable TypeEnum type) {
    * @return type
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -111,7 +111,7 @@ public TypeEnum getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -134,14 +134,14 @@ public String getNullableProperty() {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
     return nullableProperty;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   public void setNullableProperty_JsonNullable(JsonNullable<String> nullableProperty) {
     this.nullableProperty = nullableProperty;
   }
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Pet.java
index 9d7c0474c81d..cae28aba50e4 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Pet.java
@@ -119,7 +119,7 @@ public Pet id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -127,7 +127,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -144,7 +144,7 @@ public Pet category(@jakarta.annotation.Nullable Category category) {
    * @return category
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -152,7 +152,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@jakarta.annotation.Nullable Category category) {
     this.category = category;
@@ -169,7 +169,7 @@ public Pet name(@jakarta.annotation.Nonnull String name) {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -177,7 +177,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
@@ -202,7 +202,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -211,7 +211,7 @@ public Set<String> getPhotoUrls() {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@jakarta.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -236,7 +236,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -244,7 +244,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@jakarta.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -261,7 +261,7 @@ public Pet status(@jakarta.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -269,7 +269,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 853c6cf7dc52..0ccd91f0f2b6 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -47,7 +47,7 @@ public ReadOnlyFirst() {
    */
   @JsonCreator
   public ReadOnlyFirst(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar
   ) {
     this();
     this.bar = bar;
@@ -58,7 +58,7 @@ public ReadOnlyFirst(
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -78,7 +78,7 @@ public ReadOnlyFirst baz(@jakarta.annotation.Nullable String baz) {
    * @return baz
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -86,7 +86,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@jakarta.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 1c2d80cdc2a9..038228de1113 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -50,7 +50,7 @@ public SpecialModelName() {
    * @return $specialPropertyName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -58,7 +58,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@jakarta.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Tag.java
index 829ffea7bbf9..dc7c0c785fd7 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Tag.java
@@ -54,7 +54,7 @@ public Tag id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Tag name(@jakarta.annotation.Nullable String name) {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 9ceeaef529fd..6fffe0426b98 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -53,7 +53,7 @@ public TestInlineFreeformAdditionalPropertiesRequest someProperty(@jakarta.annot
    * @return someProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -61,7 +61,7 @@ public String getSomeProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@jakarta.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/User.java
index 714d378f69e2..1fc9134e7812 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/User.java
@@ -84,7 +84,7 @@ public User id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -92,7 +92,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -109,7 +109,7 @@ public User username(@jakarta.annotation.Nullable String username) {
    * @return username
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -117,7 +117,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -134,7 +134,7 @@ public User firstName(@jakarta.annotation.Nullable String firstName) {
    * @return firstName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -142,7 +142,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@jakarta.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -159,7 +159,7 @@ public User lastName(@jakarta.annotation.Nullable String lastName) {
    * @return lastName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -167,7 +167,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@jakarta.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -184,7 +184,7 @@ public User email(@jakarta.annotation.Nullable String email) {
    * @return email
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -192,7 +192,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@jakarta.annotation.Nullable String email) {
     this.email = email;
@@ -209,7 +209,7 @@ public User password(@jakarta.annotation.Nullable String password) {
    * @return password
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -217,7 +217,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@jakarta.annotation.Nullable String password) {
     this.password = password;
@@ -234,7 +234,7 @@ public User phone(@jakarta.annotation.Nullable String phone) {
    * @return phone
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -242,7 +242,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@jakarta.annotation.Nullable String phone) {
     this.phone = phone;
@@ -259,7 +259,7 @@ public User userStatus(@jakarta.annotation.Nullable Integer userStatus) {
    * @return userStatus
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -267,7 +267,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@jakarta.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index edf88bff7535..80e59a00a54f 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -64,7 +64,7 @@ public AdditionalPropertiesClass putMapPropertyItem(String key, String mapProper
    * @return mapProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -72,7 +72,7 @@ public Map<String, String> getMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@jakarta.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -97,7 +97,7 @@ public AdditionalPropertiesClass putMapOfMapPropertyItem(String key, Map<String,
    * @return mapOfMapProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -105,7 +105,7 @@ public Map<String, Map<String, String>> getMapOfMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 9eb8a5828740..533bc0516cf4 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -55,7 +55,7 @@ public AllOfWithSingleRef username(@jakarta.annotation.Nullable String username)
    * @return username
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -63,7 +63,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -80,7 +80,7 @@ public AllOfWithSingleRef singleRefType(@jakarta.annotation.Nullable SingleRefTy
    * @return singleRefType
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -88,7 +88,7 @@ public SingleRefType getSingleRefType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@jakarta.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Animal.java
index 29e7a29744b1..047a851fccf7 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Animal.java
@@ -67,7 +67,7 @@ public Animal className(@jakarta.annotation.Nonnull String className) {
    * @return className
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -75,7 +75,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
@@ -92,7 +92,7 @@ public Animal color(@jakarta.annotation.Nullable String color) {
    * @return color
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -100,7 +100,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@jakarta.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 1ae03dc36297..a9ed579720c5 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -61,7 +61,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    * @return arrayArrayNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -69,7 +69,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@jakarta.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index f10faf2542f8..b8dbf6692ba9 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -61,7 +61,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    * @return arrayNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -69,7 +69,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@jakarta.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayTest.java
index b66cc36c42b9..9cdd559053c0 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -71,7 +71,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    * @return arrayOfString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -79,7 +79,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@jakarta.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -104,7 +104,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    * @return arrayArrayOfInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -112,7 +112,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@jakarta.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -137,7 +137,7 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    * @return arrayArrayOfModel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -145,7 +145,7 @@ public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@jakarta.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Capitalization.java
index bb010e6733b0..e0a48eaef0d1 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -74,7 +74,7 @@ public Capitalization smallCamel(@jakarta.annotation.Nullable String smallCamel)
    * @return smallCamel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -82,7 +82,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@jakarta.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -99,7 +99,7 @@ public Capitalization capitalCamel(@jakarta.annotation.Nullable String capitalCa
    * @return capitalCamel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -107,7 +107,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@jakarta.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -124,7 +124,7 @@ public Capitalization smallSnake(@jakarta.annotation.Nullable String smallSnake)
    * @return smallSnake
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -132,7 +132,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@jakarta.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -149,7 +149,7 @@ public Capitalization capitalSnake(@jakarta.annotation.Nullable String capitalSn
    * @return capitalSnake
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -157,7 +157,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@jakarta.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -174,7 +174,7 @@ public Capitalization scAETHFlowPoints(@jakarta.annotation.Nullable String scAET
    * @return scAETHFlowPoints
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -182,7 +182,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@jakarta.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -199,7 +199,7 @@ public Capitalization ATT_NAME(@jakarta.annotation.Nullable String ATT_NAME) {
    * @return ATT_NAME
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -207,7 +207,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@jakarta.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Cat.java
index 4773aae3302e..b71fd7840dff 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Cat.java
@@ -60,7 +60,7 @@ public Cat declawed(@jakarta.annotation.Nullable Boolean declawed) {
    * @return declawed
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -68,7 +68,7 @@ public Boolean getDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@jakarta.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Category.java
index f2866299d350..9e6c1ab26a73 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Category.java
@@ -54,7 +54,7 @@ public Category id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Category name(@jakarta.annotation.Nonnull String name) {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index a87ebb3f8d4b..f8d891cd768a 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -61,7 +61,7 @@ public ChildWithNullable otherProperty(@jakarta.annotation.Nullable String other
    * @return otherProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -69,7 +69,7 @@ public String getOtherProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@jakarta.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ClassModel.java
index 593b76dba904..db366f297b8c 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -49,7 +49,7 @@ public ClassModel propertyClass(@jakarta.annotation.Nullable String propertyClas
    * @return propertyClass
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -57,7 +57,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Client.java
index df320aff56c2..97b0281e1432 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Client.java
@@ -49,7 +49,7 @@ public Client client(@jakarta.annotation.Nullable String client) {
    * @return client
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -57,7 +57,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@jakarta.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 4952170c8278..09e2849033ea 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -51,7 +51,7 @@ public DeprecatedObject name(@jakarta.annotation.Nullable String name) {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -59,7 +59,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Dog.java
index fef00ec1ebe5..c36849edc666 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Dog.java
@@ -60,7 +60,7 @@ public Dog breed(@jakarta.annotation.Nullable String breed) {
    * @return breed
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -68,7 +68,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@jakarta.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/EnumArrays.java
index 237e564b4e1a..0949c7299f75 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -127,7 +127,7 @@ public EnumArrays justSymbol(@jakarta.annotation.Nullable JustSymbolEnum justSym
    * @return justSymbol
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -135,7 +135,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@jakarta.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -160,7 +160,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    * @return arrayEnum
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -168,7 +168,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@jakarta.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/EnumTest.java
index 95f2dbb21bc6..01e8d87d5fc9 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -237,7 +237,7 @@ public EnumTest enumString(@jakarta.annotation.Nullable EnumStringEnum enumStrin
    * @return enumString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -245,7 +245,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@jakarta.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -262,7 +262,7 @@ public EnumTest enumStringRequired(@jakarta.annotation.Nonnull EnumStringRequire
    * @return enumStringRequired
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -270,7 +270,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@jakarta.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -287,7 +287,7 @@ public EnumTest enumInteger(@jakarta.annotation.Nullable EnumIntegerEnum enumInt
    * @return enumInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -295,7 +295,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@jakarta.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -312,7 +312,7 @@ public EnumTest enumNumber(@jakarta.annotation.Nullable EnumNumberEnum enumNumbe
    * @return enumNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -320,7 +320,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@jakarta.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -343,14 +343,14 @@ public OuterEnum getOuterEnum() {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
     return outerEnum;
   }
   
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   public void setOuterEnum_JsonNullable(JsonNullable<OuterEnum> outerEnum) {
     this.outerEnum = outerEnum;
   }
@@ -370,7 +370,7 @@ public EnumTest outerEnumInteger(@jakarta.annotation.Nullable OuterEnumInteger o
    * @return outerEnumInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -378,7 +378,7 @@ public OuterEnumInteger getOuterEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@jakarta.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -395,7 +395,7 @@ public EnumTest outerEnumDefaultValue(@jakarta.annotation.Nullable OuterEnumDefa
    * @return outerEnumDefaultValue
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -403,7 +403,7 @@ public OuterEnumDefaultValue getOuterEnumDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@jakarta.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -420,7 +420,7 @@ public EnumTest outerEnumIntegerDefaultValue(@jakarta.annotation.Nullable OuterE
    * @return outerEnumIntegerDefaultValue
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -428,7 +428,7 @@ public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@jakarta.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 90107f0a33e8..0d161fc3c29f 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -58,7 +58,7 @@ public FakeBigDecimalMap200Response someId(@jakarta.annotation.Nullable BigDecim
    * @return someId
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -66,7 +66,7 @@ public BigDecimal getSomeId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@jakarta.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -91,7 +91,7 @@ public FakeBigDecimalMap200Response putSomeMapItem(String key, BigDecimal someMa
    * @return someMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -99,7 +99,7 @@ public Map<String, BigDecimal> getSomeMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@jakarta.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 89ec88c929cb..c2b3699eac84 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -58,7 +58,7 @@ public FileSchemaTestClass _file(@jakarta.annotation.Nullable ModelFile _file) {
    * @return _file
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -66,7 +66,7 @@ public ModelFile getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@jakarta.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -91,7 +91,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
    * @return files
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -99,7 +99,7 @@ public List<ModelFile> getFiles() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@jakarta.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Foo.java
index c65cfef18961..a1ed20f42d37 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Foo.java
@@ -49,7 +49,7 @@ public Foo bar(@jakarta.annotation.Nullable String bar) {
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -57,7 +57,7 @@ public String getBar() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@jakarta.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 566afef3ebf9..f5cbca8e2ebe 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -51,7 +51,7 @@ public FooGetDefaultResponse string(@jakarta.annotation.Nullable Foo string) {
    * @return string
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -59,7 +59,7 @@ public Foo getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FormatTest.java
index 4a2c7b6f1682..74d5fa6d41ee 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -132,7 +132,7 @@ public FormatTest integer(@jakarta.annotation.Nullable Integer integer) {
    * @return integer
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -140,7 +140,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@jakarta.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -159,7 +159,7 @@ public FormatTest int32(@jakarta.annotation.Nullable Integer int32) {
    * @return int32
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -167,7 +167,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@jakarta.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -184,7 +184,7 @@ public FormatTest int64(@jakarta.annotation.Nullable Long int64) {
    * @return int64
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -192,7 +192,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@jakarta.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -211,7 +211,7 @@ public FormatTest number(@jakarta.annotation.Nonnull BigDecimal number) {
    * @return number
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -219,7 +219,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@jakarta.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -238,7 +238,7 @@ public FormatTest _float(@jakarta.annotation.Nullable Float _float) {
    * @return _float
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -246,7 +246,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@jakarta.annotation.Nullable Float _float) {
     this._float = _float;
@@ -265,7 +265,7 @@ public FormatTest _double(@jakarta.annotation.Nullable Double _double) {
    * @return _double
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -273,7 +273,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@jakarta.annotation.Nullable Double _double) {
     this._double = _double;
@@ -290,7 +290,7 @@ public FormatTest decimal(@jakarta.annotation.Nullable BigDecimal decimal) {
    * @return decimal
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -298,7 +298,7 @@ public BigDecimal getDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@jakarta.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -315,7 +315,7 @@ public FormatTest string(@jakarta.annotation.Nullable String string) {
    * @return string
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -323,7 +323,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable String string) {
     this.string = string;
@@ -340,7 +340,7 @@ public FormatTest _byte(@jakarta.annotation.Nonnull byte[] _byte) {
    * @return _byte
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -348,7 +348,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@jakarta.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -365,7 +365,7 @@ public FormatTest binary(@jakarta.annotation.Nullable File binary) {
    * @return binary
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -373,7 +373,7 @@ public File getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@jakarta.annotation.Nullable File binary) {
     this.binary = binary;
@@ -390,7 +390,7 @@ public FormatTest date(@jakarta.annotation.Nonnull LocalDate date) {
    * @return date
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -398,7 +398,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@jakarta.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -415,7 +415,7 @@ public FormatTest dateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime)
    * @return dateTime
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -423,7 +423,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -440,7 +440,7 @@ public FormatTest uuid(@jakarta.annotation.Nullable UUID uuid) {
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -448,7 +448,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -465,7 +465,7 @@ public FormatTest password(@jakarta.annotation.Nonnull String password) {
    * @return password
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -473,7 +473,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@jakarta.annotation.Nonnull String password) {
     this.password = password;
@@ -490,7 +490,7 @@ public FormatTest patternWithDigits(@jakarta.annotation.Nullable String patternW
    * @return patternWithDigits
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -498,7 +498,7 @@ public String getPatternWithDigits() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@jakarta.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -515,7 +515,7 @@ public FormatTest patternWithDigitsAndDelimiter(@jakarta.annotation.Nullable Str
    * @return patternWithDigitsAndDelimiter
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -523,7 +523,7 @@ public String getPatternWithDigitsAndDelimiter() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@jakarta.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 54024338b2be..0f6c6317185e 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -48,8 +48,8 @@ public HasOnlyReadOnly() {
    */
   @JsonCreator
   public HasOnlyReadOnly(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar, 
-    @JsonProperty(JSON_PROPERTY_FOO) String foo
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar, 
+    @JsonProperty(value = JSON_PROPERTY_FOO, required = false) String foo
   ) {
     this();
     this.bar = bar;
@@ -61,7 +61,7 @@ public HasOnlyReadOnly(
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -75,7 +75,7 @@ public String getBar() {
    * @return foo
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 0bdb79a0239f..006694645085 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -59,14 +59,14 @@ public String getNullableMessage() {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
     return nullableMessage;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   public void setNullableMessage_JsonNullable(JsonNullable<String> nullableMessage) {
     this.nullableMessage = nullableMessage;
   }
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/MapTest.java
index ec11b3125994..1429c150511a 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/MapTest.java
@@ -109,7 +109,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    * @return mapMapOfString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -117,7 +117,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -142,7 +142,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    * @return mapOfEnumString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -150,7 +150,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@jakarta.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -175,7 +175,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    * @return directMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -183,7 +183,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@jakarta.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -208,7 +208,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    * @return indirectMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -216,7 +216,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@jakarta.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 190f20d0f81a..13749a9b6cdb 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -64,7 +64,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@jakarta.annotation.Null
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -72,7 +72,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -89,7 +89,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@jakarta.annotation.
    * @return dateTime
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -97,7 +97,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -122,7 +122,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    * @return map
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -130,7 +130,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@jakarta.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Model200Response.java
index 8b2f988e73ad..dc80a7a4b683 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -55,7 +55,7 @@ public Model200Response name(@jakarta.annotation.Nullable Integer name) {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -63,7 +63,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable Integer name) {
     this.name = name;
@@ -80,7 +80,7 @@ public Model200Response propertyClass(@jakarta.annotation.Nullable String proper
    * @return propertyClass
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -88,7 +88,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index ce7319bf809e..a0ef10546fc6 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -60,7 +60,7 @@ public ModelApiResponse code(@jakarta.annotation.Nullable Integer code) {
    * @return code
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -68,7 +68,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@jakarta.annotation.Nullable Integer code) {
     this.code = code;
@@ -85,7 +85,7 @@ public ModelApiResponse type(@jakarta.annotation.Nullable String type) {
    * @return type
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -93,7 +93,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable String type) {
     this.type = type;
@@ -110,7 +110,7 @@ public ModelApiResponse message(@jakarta.annotation.Nullable String message) {
    * @return message
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -118,7 +118,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@jakarta.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelFile.java
index 942c8ffced2b..911e26d08ffa 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -50,7 +50,7 @@ public ModelFile sourceURI(@jakarta.annotation.Nullable String sourceURI) {
    * @return sourceURI
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -58,7 +58,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@jakarta.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelList.java
index 8d69575c669c..04776712bced 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelList.java
@@ -50,7 +50,7 @@ public ModelList _123list(@jakarta.annotation.Nullable String _123list) {
    * @return _123list
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -58,7 +58,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@jakarta.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelReturn.java
index c23b56609afd..58636ff4976a 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -50,7 +50,7 @@ public ModelReturn _return(@jakarta.annotation.Nullable Integer _return) {
    * @return _return
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -58,7 +58,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@jakarta.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Name.java
index f43a96ccb6b4..bd501b554294 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Name.java
@@ -57,8 +57,8 @@ public Name() {
    */
   @JsonCreator
   public Name(
-    @JsonProperty(JSON_PROPERTY_SNAKE_CASE) Integer snakeCase, 
-    @JsonProperty(JSON_PROPERTY_123NUMBER) Integer _123number
+    @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false) Integer snakeCase, 
+    @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false) Integer _123number
   ) {
     this();
     this.snakeCase = snakeCase;
@@ -76,7 +76,7 @@ public Name name(@jakarta.annotation.Nonnull Integer name) {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -84,7 +84,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull Integer name) {
     this.name = name;
@@ -95,7 +95,7 @@ public void setName(@jakarta.annotation.Nonnull Integer name) {
    * @return snakeCase
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -115,7 +115,7 @@ public Name property(@jakarta.annotation.Nullable String property) {
    * @return property
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -123,7 +123,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@jakarta.annotation.Nullable String property) {
     this.property = property;
@@ -134,7 +134,7 @@ public void setProperty(@jakarta.annotation.Nullable String property) {
    * @return _123number
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/NullableClass.java
index d72693492a7f..f9bc553c18b0 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -123,14 +123,14 @@ public Integer getIntegerProp() {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
     return integerProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   public void setIntegerProp_JsonNullable(JsonNullable<Integer> integerProp) {
     this.integerProp = integerProp;
   }
@@ -156,14 +156,14 @@ public BigDecimal getNumberProp() {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
     return numberProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   public void setNumberProp_JsonNullable(JsonNullable<BigDecimal> numberProp) {
     this.numberProp = numberProp;
   }
@@ -189,14 +189,14 @@ public Boolean getBooleanProp() {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
     return booleanProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   public void setBooleanProp_JsonNullable(JsonNullable<Boolean> booleanProp) {
     this.booleanProp = booleanProp;
   }
@@ -222,14 +222,14 @@ public String getStringProp() {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
     return stringProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   public void setStringProp_JsonNullable(JsonNullable<String> stringProp) {
     this.stringProp = stringProp;
   }
@@ -255,14 +255,14 @@ public LocalDate getDateProp() {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
     return dateProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   public void setDateProp_JsonNullable(JsonNullable<LocalDate> dateProp) {
     this.dateProp = dateProp;
   }
@@ -288,14 +288,14 @@ public OffsetDateTime getDatetimeProp() {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
     return datetimeProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   public void setDatetimeProp_JsonNullable(JsonNullable<OffsetDateTime> datetimeProp) {
     this.datetimeProp = datetimeProp;
   }
@@ -333,14 +333,14 @@ public List<Object> getArrayNullableProp() {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
     return arrayNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   public void setArrayNullableProp_JsonNullable(JsonNullable<List<Object>> arrayNullableProp) {
     this.arrayNullableProp = arrayNullableProp;
   }
@@ -378,14 +378,14 @@ public List<Object> getArrayAndItemsNullableProp() {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
     return arrayAndItemsNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   public void setArrayAndItemsNullableProp_JsonNullable(JsonNullable<List<Object>> arrayAndItemsNullableProp) {
     this.arrayAndItemsNullableProp = arrayAndItemsNullableProp;
   }
@@ -413,7 +413,7 @@ public NullableClass addArrayItemsNullableItem(Object arrayItemsNullableItem) {
    * @return arrayItemsNullable
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -421,7 +421,7 @@ public List<Object> getArrayItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@jakarta.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -456,14 +456,14 @@ public Map<String, Object> getObjectNullableProp() {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
     return objectNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   public void setObjectNullableProp_JsonNullable(JsonNullable<Map<String, Object>> objectNullableProp) {
     this.objectNullableProp = objectNullableProp;
   }
@@ -501,14 +501,14 @@ public Map<String, Object> getObjectAndItemsNullableProp() {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
     return objectAndItemsNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   public void setObjectAndItemsNullableProp_JsonNullable(JsonNullable<Map<String, Object>> objectAndItemsNullableProp) {
     this.objectAndItemsNullableProp = objectAndItemsNullableProp;
   }
@@ -536,7 +536,7 @@ public NullableClass putObjectItemsNullableItem(String key, Object objectItemsNu
    * @return objectItemsNullable
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -544,7 +544,7 @@ public Map<String, Object> getObjectItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@jakarta.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/NumberOnly.java
index d08ace18e881..2776b239d592 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -50,7 +50,7 @@ public NumberOnly justNumber(@jakarta.annotation.Nullable BigDecimal justNumber)
    * @return justNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -58,7 +58,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@jakarta.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 35014d0ccc6a..4917cb11e91f 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -69,7 +69,7 @@ public ObjectWithDeprecatedFields uuid(@jakarta.annotation.Nullable String uuid)
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -77,7 +77,7 @@ public String getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -96,7 +96,7 @@ public ObjectWithDeprecatedFields id(@jakarta.annotation.Nullable BigDecimal id)
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -104,7 +104,7 @@ public BigDecimal getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -123,7 +123,7 @@ public ObjectWithDeprecatedFields deprecatedRef(@jakarta.annotation.Nullable Dep
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -131,7 +131,7 @@ public DeprecatedObject getDeprecatedRef() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@jakarta.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -158,7 +158,7 @@ public ObjectWithDeprecatedFields addBarsItem(String barsItem) {
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -166,7 +166,7 @@ public List<String> getBars() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@jakarta.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Order.java
index b2447ba61b13..dbdc4d20d43d 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Order.java
@@ -112,7 +112,7 @@ public Order id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -120,7 +120,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -137,7 +137,7 @@ public Order petId(@jakarta.annotation.Nullable Long petId) {
    * @return petId
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -145,7 +145,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@jakarta.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -162,7 +162,7 @@ public Order quantity(@jakarta.annotation.Nullable Integer quantity) {
    * @return quantity
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -170,7 +170,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@jakarta.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -187,7 +187,7 @@ public Order shipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
    * @return shipDate
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -195,7 +195,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -212,7 +212,7 @@ public Order status(@jakarta.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -220,7 +220,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -237,7 +237,7 @@ public Order complete(@jakarta.annotation.Nullable Boolean complete) {
    * @return complete
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -245,7 +245,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@jakarta.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/OuterComposite.java
index 2a671305cc95..679413f53253 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -60,7 +60,7 @@ public OuterComposite myNumber(@jakarta.annotation.Nullable BigDecimal myNumber)
    * @return myNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -68,7 +68,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@jakarta.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -85,7 +85,7 @@ public OuterComposite myString(@jakarta.annotation.Nullable String myString) {
    * @return myString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -93,7 +93,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@jakarta.annotation.Nullable String myString) {
     this.myString = myString;
@@ -110,7 +110,7 @@ public OuterComposite myBoolean(@jakarta.annotation.Nullable Boolean myBoolean)
    * @return myBoolean
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -118,7 +118,7 @@ public Boolean getMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@jakarta.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 3344e37f2645..c5a8a9268376 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -50,7 +50,7 @@ public OuterObjectWithEnumProperty value(@jakarta.annotation.Nonnull OuterEnumIn
    * @return value
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -58,7 +58,7 @@ public OuterEnumInteger getValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@jakarta.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index 5c13648a7c28..371bceb9b1dc 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -103,7 +103,7 @@ public ParentWithNullable type(@jakarta.annotation.Nullable TypeEnum type) {
    * @return type
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -111,7 +111,7 @@ public TypeEnum getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -134,14 +134,14 @@ public String getNullableProperty() {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
     return nullableProperty;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   public void setNullableProperty_JsonNullable(JsonNullable<String> nullableProperty) {
     this.nullableProperty = nullableProperty;
   }
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Pet.java
index 77ae32aae946..642e316bf873 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Pet.java
@@ -119,7 +119,7 @@ public Pet id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -127,7 +127,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -144,7 +144,7 @@ public Pet category(@jakarta.annotation.Nullable Category category) {
    * @return category
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -152,7 +152,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@jakarta.annotation.Nullable Category category) {
     this.category = category;
@@ -169,7 +169,7 @@ public Pet name(@jakarta.annotation.Nonnull String name) {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -177,7 +177,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
@@ -202,7 +202,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -211,7 +211,7 @@ public Set<String> getPhotoUrls() {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@jakarta.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -236,7 +236,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -244,7 +244,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@jakarta.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -261,7 +261,7 @@ public Pet status(@jakarta.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -269,7 +269,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 853c6cf7dc52..0ccd91f0f2b6 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -47,7 +47,7 @@ public ReadOnlyFirst() {
    */
   @JsonCreator
   public ReadOnlyFirst(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar
   ) {
     this();
     this.bar = bar;
@@ -58,7 +58,7 @@ public ReadOnlyFirst(
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -78,7 +78,7 @@ public ReadOnlyFirst baz(@jakarta.annotation.Nullable String baz) {
    * @return baz
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -86,7 +86,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@jakarta.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 1c2d80cdc2a9..038228de1113 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -50,7 +50,7 @@ public SpecialModelName() {
    * @return $specialPropertyName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -58,7 +58,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@jakarta.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Tag.java
index 829ffea7bbf9..dc7c0c785fd7 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Tag.java
@@ -54,7 +54,7 @@ public Tag id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Tag name(@jakarta.annotation.Nullable String name) {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 9ceeaef529fd..6fffe0426b98 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -53,7 +53,7 @@ public TestInlineFreeformAdditionalPropertiesRequest someProperty(@jakarta.annot
    * @return someProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -61,7 +61,7 @@ public String getSomeProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@jakarta.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/User.java
index 714d378f69e2..1fc9134e7812 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/User.java
@@ -84,7 +84,7 @@ public User id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -92,7 +92,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -109,7 +109,7 @@ public User username(@jakarta.annotation.Nullable String username) {
    * @return username
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -117,7 +117,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -134,7 +134,7 @@ public User firstName(@jakarta.annotation.Nullable String firstName) {
    * @return firstName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -142,7 +142,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@jakarta.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -159,7 +159,7 @@ public User lastName(@jakarta.annotation.Nullable String lastName) {
    * @return lastName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -167,7 +167,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@jakarta.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -184,7 +184,7 @@ public User email(@jakarta.annotation.Nullable String email) {
    * @return email
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -192,7 +192,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@jakarta.annotation.Nullable String email) {
     this.email = email;
@@ -209,7 +209,7 @@ public User password(@jakarta.annotation.Nullable String password) {
    * @return password
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -217,7 +217,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@jakarta.annotation.Nullable String password) {
     this.password = password;
@@ -234,7 +234,7 @@ public User phone(@jakarta.annotation.Nullable String phone) {
    * @return phone
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -242,7 +242,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@jakarta.annotation.Nullable String phone) {
     this.phone = phone;
@@ -259,7 +259,7 @@ public User userStatus(@jakarta.annotation.Nullable Integer userStatus) {
    * @return userStatus
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -267,7 +267,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@jakarta.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 01e6dd38c2e2..773fc1ab4e61 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -64,7 +64,7 @@ public AdditionalPropertiesClass putMapPropertyItem(String key, String mapProper
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -72,7 +72,7 @@ public Map<String, String> getMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -97,7 +97,7 @@ public AdditionalPropertiesClass putMapOfMapPropertyItem(String key, Map<String,
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -105,7 +105,7 @@ public Map<String, Map<String, String>> getMapOfMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 4369abfbfa8c..44f5d5faa6c1 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -55,7 +55,7 @@ public AllOfWithSingleRef username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -63,7 +63,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -80,7 +80,7 @@ public AllOfWithSingleRef singleRefType(@javax.annotation.Nullable SingleRefType
    * @return singleRefType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -88,7 +88,7 @@ public SingleRefType getSingleRefType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@javax.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Animal.java
index 76d809224eb5..2456fc0ac448 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Animal.java
@@ -67,7 +67,7 @@ public Animal className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -75,7 +75,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -92,7 +92,7 @@ public Animal color(@javax.annotation.Nullable String color) {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -100,7 +100,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 9f9230f5c51b..e48bf84ca4cc 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -61,7 +61,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -69,7 +69,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 95eb35a262ca..01c9badd8ece 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -61,7 +61,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -69,7 +69,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayTest.java
index 6e87eafcc512..006c8ce93a21 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -71,7 +71,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -79,7 +79,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -104,7 +104,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -112,7 +112,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -137,7 +137,7 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -145,7 +145,7 @@ public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Capitalization.java
index dec70966d099..dd08bed9aebb 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -74,7 +74,7 @@ public Capitalization smallCamel(@javax.annotation.Nullable String smallCamel) {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -82,7 +82,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -99,7 +99,7 @@ public Capitalization capitalCamel(@javax.annotation.Nullable String capitalCame
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -107,7 +107,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -124,7 +124,7 @@ public Capitalization smallSnake(@javax.annotation.Nullable String smallSnake) {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -132,7 +132,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -149,7 +149,7 @@ public Capitalization capitalSnake(@javax.annotation.Nullable String capitalSnak
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -157,7 +157,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -174,7 +174,7 @@ public Capitalization scAETHFlowPoints(@javax.annotation.Nullable String scAETHF
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -182,7 +182,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -199,7 +199,7 @@ public Capitalization ATT_NAME(@javax.annotation.Nullable String ATT_NAME) {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -207,7 +207,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Cat.java
index 53bed2e41f6b..3debe07d238a 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Cat.java
@@ -60,7 +60,7 @@ public Cat declawed(@javax.annotation.Nullable Boolean declawed) {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -68,7 +68,7 @@ public Boolean getDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Category.java
index d1fc7b09c499..9e1b7316bbfa 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Category.java
@@ -54,7 +54,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Category name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index 557f2f88af9a..5eed020a1cf3 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -61,7 +61,7 @@ public ChildWithNullable otherProperty(@javax.annotation.Nullable String otherPr
    * @return otherProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -69,7 +69,7 @@ public String getOtherProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@javax.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ClassModel.java
index 675e9f398283..e8d8b419f6ab 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -49,7 +49,7 @@ public ClassModel propertyClass(@javax.annotation.Nullable String propertyClass)
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -57,7 +57,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Client.java
index 434d46ad1b64..2d1ad6833b70 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Client.java
@@ -49,7 +49,7 @@ public Client client(@javax.annotation.Nullable String client) {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -57,7 +57,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index fee5fff083d4..478fce069d5a 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -51,7 +51,7 @@ public DeprecatedObject name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -59,7 +59,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Dog.java
index b62b147f96e1..8787d050632b 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Dog.java
@@ -60,7 +60,7 @@ public Dog breed(@javax.annotation.Nullable String breed) {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -68,7 +68,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/EnumArrays.java
index 96da52dd6a11..2d9895cc3874 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -127,7 +127,7 @@ public EnumArrays justSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbo
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -135,7 +135,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -160,7 +160,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -168,7 +168,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/EnumTest.java
index 69c3f59d7f9b..9373c81107df 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -237,7 +237,7 @@ public EnumTest enumString(@javax.annotation.Nullable EnumStringEnum enumString)
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -245,7 +245,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -262,7 +262,7 @@ public EnumTest enumStringRequired(@javax.annotation.Nonnull EnumStringRequiredE
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -270,7 +270,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -287,7 +287,7 @@ public EnumTest enumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteg
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -295,7 +295,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -312,7 +312,7 @@ public EnumTest enumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber)
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -320,7 +320,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -343,14 +343,14 @@ public OuterEnum getOuterEnum() {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
     return outerEnum;
   }
   
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   public void setOuterEnum_JsonNullable(JsonNullable<OuterEnum> outerEnum) {
     this.outerEnum = outerEnum;
   }
@@ -370,7 +370,7 @@ public EnumTest outerEnumInteger(@javax.annotation.Nullable OuterEnumInteger out
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -378,7 +378,7 @@ public OuterEnumInteger getOuterEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -395,7 +395,7 @@ public EnumTest outerEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaul
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -403,7 +403,7 @@ public OuterEnumDefaultValue getOuterEnumDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -420,7 +420,7 @@ public EnumTest outerEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnu
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -428,7 +428,7 @@ public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 7eca4111f558..c846c711391a 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -58,7 +58,7 @@ public FakeBigDecimalMap200Response someId(@javax.annotation.Nullable BigDecimal
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -66,7 +66,7 @@ public BigDecimal getSomeId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -91,7 +91,7 @@ public FakeBigDecimalMap200Response putSomeMapItem(String key, BigDecimal someMa
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -99,7 +99,7 @@ public Map<String, BigDecimal> getSomeMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 3231a00ed0f3..39bb17b9ea7b 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -58,7 +58,7 @@ public FileSchemaTestClass _file(@javax.annotation.Nullable ModelFile _file) {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -66,7 +66,7 @@ public ModelFile getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -91,7 +91,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -99,7 +99,7 @@ public List<ModelFile> getFiles() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Foo.java
index 161a8e206d43..d06e5dfe98a7 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Foo.java
@@ -49,7 +49,7 @@ public Foo bar(@javax.annotation.Nullable String bar) {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -57,7 +57,7 @@ public String getBar() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index fb1067ffcb00..c0fcd22a6969 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -51,7 +51,7 @@ public FooGetDefaultResponse string(@javax.annotation.Nullable Foo string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -59,7 +59,7 @@ public Foo getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FormatTest.java
index 7577b34cb2d0..c0367124adf5 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -132,7 +132,7 @@ public FormatTest integer(@javax.annotation.Nullable Integer integer) {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -140,7 +140,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -159,7 +159,7 @@ public FormatTest int32(@javax.annotation.Nullable Integer int32) {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -167,7 +167,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -184,7 +184,7 @@ public FormatTest int64(@javax.annotation.Nullable Long int64) {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -192,7 +192,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -211,7 +211,7 @@ public FormatTest number(@javax.annotation.Nonnull BigDecimal number) {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -219,7 +219,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -238,7 +238,7 @@ public FormatTest _float(@javax.annotation.Nullable Float _float) {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -246,7 +246,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -265,7 +265,7 @@ public FormatTest _double(@javax.annotation.Nullable Double _double) {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -273,7 +273,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -290,7 +290,7 @@ public FormatTest decimal(@javax.annotation.Nullable BigDecimal decimal) {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -298,7 +298,7 @@ public BigDecimal getDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -315,7 +315,7 @@ public FormatTest string(@javax.annotation.Nullable String string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -323,7 +323,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -340,7 +340,7 @@ public FormatTest _byte(@javax.annotation.Nonnull byte[] _byte) {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -348,7 +348,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -365,7 +365,7 @@ public FormatTest binary(@javax.annotation.Nullable File binary) {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -373,7 +373,7 @@ public File getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -390,7 +390,7 @@ public FormatTest date(@javax.annotation.Nonnull LocalDate date) {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -398,7 +398,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -415,7 +415,7 @@ public FormatTest dateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -423,7 +423,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -440,7 +440,7 @@ public FormatTest uuid(@javax.annotation.Nullable UUID uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -448,7 +448,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -465,7 +465,7 @@ public FormatTest password(@javax.annotation.Nonnull String password) {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -473,7 +473,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -490,7 +490,7 @@ public FormatTest patternWithDigits(@javax.annotation.Nullable String patternWit
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -498,7 +498,7 @@ public String getPatternWithDigits() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -515,7 +515,7 @@ public FormatTest patternWithDigitsAndDelimiter(@javax.annotation.Nullable Strin
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -523,7 +523,7 @@ public String getPatternWithDigitsAndDelimiter() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index fab16c721c1c..75462506e6c8 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -48,8 +48,8 @@ public HasOnlyReadOnly() {
    */
   @JsonCreator
   public HasOnlyReadOnly(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar, 
-    @JsonProperty(JSON_PROPERTY_FOO) String foo
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar, 
+    @JsonProperty(value = JSON_PROPERTY_FOO, required = false) String foo
   ) {
     this();
     this.bar = bar;
@@ -61,7 +61,7 @@ public HasOnlyReadOnly(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -75,7 +75,7 @@ public String getBar() {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 8780c33267c5..7709e89cc9be 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -59,14 +59,14 @@ public String getNullableMessage() {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
     return nullableMessage;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   public void setNullableMessage_JsonNullable(JsonNullable<String> nullableMessage) {
     this.nullableMessage = nullableMessage;
   }
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/MapTest.java
index 226af5128b2b..94020730a719 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/MapTest.java
@@ -109,7 +109,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -117,7 +117,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -142,7 +142,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -150,7 +150,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -175,7 +175,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -183,7 +183,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -208,7 +208,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -216,7 +216,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index be9066f8a227..c515e1506f66 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -64,7 +64,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@javax.annotation.Nullab
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -72,7 +72,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -89,7 +89,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@javax.annotation.Nu
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -97,7 +97,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -122,7 +122,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -130,7 +130,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Model200Response.java
index f445295ef573..cc0125122612 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -55,7 +55,7 @@ public Model200Response name(@javax.annotation.Nullable Integer name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -63,7 +63,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -80,7 +80,7 @@ public Model200Response propertyClass(@javax.annotation.Nullable String property
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -88,7 +88,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 9fce2e1e3bab..4b9ecc77489a 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -60,7 +60,7 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -68,7 +68,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -85,7 +85,7 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -93,7 +93,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -110,7 +110,7 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -118,7 +118,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelFile.java
index b56cda290634..aafab80e041d 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -50,7 +50,7 @@ public ModelFile sourceURI(@javax.annotation.Nullable String sourceURI) {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -58,7 +58,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelList.java
index d0f770be3bdb..2ac93e97b4c5 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelList.java
@@ -50,7 +50,7 @@ public ModelList _123list(@javax.annotation.Nullable String _123list) {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -58,7 +58,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelReturn.java
index a5e4c8656d48..2e06a4c7a467 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -50,7 +50,7 @@ public ModelReturn _return(@javax.annotation.Nullable Integer _return) {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -58,7 +58,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Name.java
index 7c79599ff5d8..ead2b3b3e5f1 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Name.java
@@ -57,8 +57,8 @@ public Name() {
    */
   @JsonCreator
   public Name(
-    @JsonProperty(JSON_PROPERTY_SNAKE_CASE) Integer snakeCase, 
-    @JsonProperty(JSON_PROPERTY_123NUMBER) Integer _123number
+    @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false) Integer snakeCase, 
+    @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false) Integer _123number
   ) {
     this();
     this.snakeCase = snakeCase;
@@ -76,7 +76,7 @@ public Name name(@javax.annotation.Nonnull Integer name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -84,7 +84,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -95,7 +95,7 @@ public void setName(@javax.annotation.Nonnull Integer name) {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -115,7 +115,7 @@ public Name property(@javax.annotation.Nullable String property) {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -123,7 +123,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -134,7 +134,7 @@ public void setProperty(@javax.annotation.Nullable String property) {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/NullableClass.java
index 44dc3d35a5ac..957da40e0afb 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -123,14 +123,14 @@ public Integer getIntegerProp() {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
     return integerProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   public void setIntegerProp_JsonNullable(JsonNullable<Integer> integerProp) {
     this.integerProp = integerProp;
   }
@@ -156,14 +156,14 @@ public BigDecimal getNumberProp() {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
     return numberProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   public void setNumberProp_JsonNullable(JsonNullable<BigDecimal> numberProp) {
     this.numberProp = numberProp;
   }
@@ -189,14 +189,14 @@ public Boolean getBooleanProp() {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
     return booleanProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   public void setBooleanProp_JsonNullable(JsonNullable<Boolean> booleanProp) {
     this.booleanProp = booleanProp;
   }
@@ -222,14 +222,14 @@ public String getStringProp() {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
     return stringProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   public void setStringProp_JsonNullable(JsonNullable<String> stringProp) {
     this.stringProp = stringProp;
   }
@@ -255,14 +255,14 @@ public LocalDate getDateProp() {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
     return dateProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   public void setDateProp_JsonNullable(JsonNullable<LocalDate> dateProp) {
     this.dateProp = dateProp;
   }
@@ -288,14 +288,14 @@ public OffsetDateTime getDatetimeProp() {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
     return datetimeProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   public void setDatetimeProp_JsonNullable(JsonNullable<OffsetDateTime> datetimeProp) {
     this.datetimeProp = datetimeProp;
   }
@@ -333,14 +333,14 @@ public List<Object> getArrayNullableProp() {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
     return arrayNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   public void setArrayNullableProp_JsonNullable(JsonNullable<List<Object>> arrayNullableProp) {
     this.arrayNullableProp = arrayNullableProp;
   }
@@ -378,14 +378,14 @@ public List<Object> getArrayAndItemsNullableProp() {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
     return arrayAndItemsNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   public void setArrayAndItemsNullableProp_JsonNullable(JsonNullable<List<Object>> arrayAndItemsNullableProp) {
     this.arrayAndItemsNullableProp = arrayAndItemsNullableProp;
   }
@@ -413,7 +413,7 @@ public NullableClass addArrayItemsNullableItem(Object arrayItemsNullableItem) {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -421,7 +421,7 @@ public List<Object> getArrayItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -456,14 +456,14 @@ public Map<String, Object> getObjectNullableProp() {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
     return objectNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   public void setObjectNullableProp_JsonNullable(JsonNullable<Map<String, Object>> objectNullableProp) {
     this.objectNullableProp = objectNullableProp;
   }
@@ -501,14 +501,14 @@ public Map<String, Object> getObjectAndItemsNullableProp() {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
     return objectAndItemsNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   public void setObjectAndItemsNullableProp_JsonNullable(JsonNullable<Map<String, Object>> objectAndItemsNullableProp) {
     this.objectAndItemsNullableProp = objectAndItemsNullableProp;
   }
@@ -536,7 +536,7 @@ public NullableClass putObjectItemsNullableItem(String key, Object objectItemsNu
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -544,7 +544,7 @@ public Map<String, Object> getObjectItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/NumberOnly.java
index 2b2688a79089..264e825134f1 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -50,7 +50,7 @@ public NumberOnly justNumber(@javax.annotation.Nullable BigDecimal justNumber) {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -58,7 +58,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 027bfe18ab35..0cc1c49da6cc 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -69,7 +69,7 @@ public ObjectWithDeprecatedFields uuid(@javax.annotation.Nullable String uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -77,7 +77,7 @@ public String getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -96,7 +96,7 @@ public ObjectWithDeprecatedFields id(@javax.annotation.Nullable BigDecimal id) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -104,7 +104,7 @@ public BigDecimal getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -123,7 +123,7 @@ public ObjectWithDeprecatedFields deprecatedRef(@javax.annotation.Nullable Depre
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -131,7 +131,7 @@ public DeprecatedObject getDeprecatedRef() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -158,7 +158,7 @@ public ObjectWithDeprecatedFields addBarsItem(String barsItem) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -166,7 +166,7 @@ public List<String> getBars() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Order.java
index 19a6f2e22dd1..075006c47dc6 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Order.java
@@ -112,7 +112,7 @@ public Order id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -120,7 +120,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -137,7 +137,7 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -145,7 +145,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -162,7 +162,7 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -170,7 +170,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -187,7 +187,7 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -195,7 +195,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -212,7 +212,7 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -220,7 +220,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -237,7 +237,7 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -245,7 +245,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/OuterComposite.java
index 7b928ac82f35..14b334e4829a 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -60,7 +60,7 @@ public OuterComposite myNumber(@javax.annotation.Nullable BigDecimal myNumber) {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -68,7 +68,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -85,7 +85,7 @@ public OuterComposite myString(@javax.annotation.Nullable String myString) {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -93,7 +93,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -110,7 +110,7 @@ public OuterComposite myBoolean(@javax.annotation.Nullable Boolean myBoolean) {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -118,7 +118,7 @@ public Boolean getMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index a8d574446886..135239e327cd 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -50,7 +50,7 @@ public OuterObjectWithEnumProperty value(@javax.annotation.Nonnull OuterEnumInte
    * @return value
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -58,7 +58,7 @@ public OuterEnumInteger getValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@javax.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index 44d26ee7013f..3715d9705a18 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -103,7 +103,7 @@ public ParentWithNullable type(@javax.annotation.Nullable TypeEnum type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -111,7 +111,7 @@ public TypeEnum getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -134,14 +134,14 @@ public String getNullableProperty() {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
     return nullableProperty;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   public void setNullableProperty_JsonNullable(JsonNullable<String> nullableProperty) {
     this.nullableProperty = nullableProperty;
   }
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Pet.java
index 9c64c19a7c2c..6642f3237661 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Pet.java
@@ -119,7 +119,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -127,7 +127,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -144,7 +144,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -152,7 +152,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -169,7 +169,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -177,7 +177,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -202,7 +202,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -211,7 +211,7 @@ public Set<String> getPhotoUrls() {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -236,7 +236,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -244,7 +244,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -261,7 +261,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -269,7 +269,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 784d47d6a106..eeffca460496 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -47,7 +47,7 @@ public ReadOnlyFirst() {
    */
   @JsonCreator
   public ReadOnlyFirst(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar
   ) {
     this();
     this.bar = bar;
@@ -58,7 +58,7 @@ public ReadOnlyFirst(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -78,7 +78,7 @@ public ReadOnlyFirst baz(@javax.annotation.Nullable String baz) {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -86,7 +86,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 7e37da197795..59e71d9aff56 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -50,7 +50,7 @@ public SpecialModelName() {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -58,7 +58,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Tag.java
index fc2ee7bfc564..83ece7141a46 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Tag.java
@@ -54,7 +54,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index b8c473679982..b6f471f25bb2 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -53,7 +53,7 @@ public TestInlineFreeformAdditionalPropertiesRequest someProperty(@javax.annotat
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -61,7 +61,7 @@ public String getSomeProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/User.java
index 4aa0d35c2889..7a457acb78ba 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/User.java
@@ -84,7 +84,7 @@ public User id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -92,7 +92,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -109,7 +109,7 @@ public User username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -117,7 +117,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -134,7 +134,7 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -142,7 +142,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -159,7 +159,7 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -167,7 +167,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -184,7 +184,7 @@ public User email(@javax.annotation.Nullable String email) {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -192,7 +192,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -209,7 +209,7 @@ public User password(@javax.annotation.Nullable String password) {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -217,7 +217,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -234,7 +234,7 @@ public User phone(@javax.annotation.Nullable String phone) {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -242,7 +242,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -259,7 +259,7 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -267,7 +267,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Category.java
index 5a9c45281899..2f55808ebd65 100644
--- a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Category.java
@@ -62,7 +62,7 @@ public Category id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -70,7 +70,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -87,7 +87,7 @@ public Category name(@jakarta.annotation.Nullable String name) {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -95,7 +95,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index b1a092209abb..3965edea7df3 100644
--- a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -69,7 +69,7 @@ public ModelApiResponse code(@jakarta.annotation.Nullable Integer code) {
    * @return code
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -77,7 +77,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@jakarta.annotation.Nullable Integer code) {
     this.code = code;
@@ -94,7 +94,7 @@ public ModelApiResponse type(@jakarta.annotation.Nullable String type) {
    * @return type
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -102,7 +102,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable String type) {
     this.type = type;
@@ -119,7 +119,7 @@ public ModelApiResponse message(@jakarta.annotation.Nullable String message) {
    * @return message
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -127,7 +127,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@jakarta.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Order.java
index 067b163d32b4..215b6e395f59 100644
--- a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Order.java
@@ -124,7 +124,7 @@ public Order id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -132,7 +132,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -149,7 +149,7 @@ public Order petId(@jakarta.annotation.Nullable Long petId) {
    * @return petId
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -157,7 +157,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@jakarta.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -174,7 +174,7 @@ public Order quantity(@jakarta.annotation.Nullable Integer quantity) {
    * @return quantity
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -182,7 +182,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@jakarta.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -199,7 +199,7 @@ public Order shipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
    * @return shipDate
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -207,7 +207,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -224,7 +224,7 @@ public Order status(@jakarta.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -232,7 +232,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -249,7 +249,7 @@ public Order complete(@jakarta.annotation.Nullable Boolean complete) {
    * @return complete
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -257,7 +257,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@jakarta.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Pet.java
index 9232da8415bd..ad8fe64521f1 100644
--- a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Pet.java
@@ -128,7 +128,7 @@ public Pet id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -136,7 +136,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -153,7 +153,7 @@ public Pet category(@jakarta.annotation.Nullable Category category) {
    * @return category
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -161,7 +161,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@jakarta.annotation.Nullable Category category) {
     this.category = category;
@@ -178,7 +178,7 @@ public Pet name(@jakarta.annotation.Nonnull String name) {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -186,7 +186,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
@@ -211,7 +211,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -219,7 +219,7 @@ public List<String> getPhotoUrls() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@jakarta.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -244,7 +244,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -252,7 +252,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@jakarta.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -271,7 +271,7 @@ public Pet status(@jakarta.annotation.Nullable StatusEnum status) {
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -279,7 +279,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Tag.java
index 1e5c3f5f2027..b23adc6dc40c 100644
--- a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Tag.java
@@ -62,7 +62,7 @@ public Tag id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -70,7 +70,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -87,7 +87,7 @@ public Tag name(@jakarta.annotation.Nullable String name) {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -95,7 +95,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/User.java
index b1f2b94f89eb..5f93ca1b71ce 100644
--- a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/User.java
@@ -98,7 +98,7 @@ public User id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -106,7 +106,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -123,7 +123,7 @@ public User username(@jakarta.annotation.Nullable String username) {
    * @return username
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -131,7 +131,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -148,7 +148,7 @@ public User firstName(@jakarta.annotation.Nullable String firstName) {
    * @return firstName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -156,7 +156,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@jakarta.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -173,7 +173,7 @@ public User lastName(@jakarta.annotation.Nullable String lastName) {
    * @return lastName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -181,7 +181,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@jakarta.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -198,7 +198,7 @@ public User email(@jakarta.annotation.Nullable String email) {
    * @return email
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -206,7 +206,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@jakarta.annotation.Nullable String email) {
     this.email = email;
@@ -223,7 +223,7 @@ public User password(@jakarta.annotation.Nullable String password) {
    * @return password
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -231,7 +231,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@jakarta.annotation.Nullable String password) {
     this.password = password;
@@ -248,7 +248,7 @@ public User phone(@jakarta.annotation.Nullable String phone) {
    * @return phone
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -256,7 +256,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@jakarta.annotation.Nullable String phone) {
     this.phone = phone;
@@ -273,7 +273,7 @@ public User userStatus(@jakarta.annotation.Nullable Integer userStatus) {
    * @return userStatus
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -281,7 +281,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@jakarta.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Category.java
index f07ed6f3827a..550ded077343 100644
--- a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Category.java
@@ -58,7 +58,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -66,7 +66,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -84,7 +84,7 @@ public Category name(@javax.annotation.Nullable String name) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -92,7 +92,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 39d5c5617ca0..f0b413d2b970 100644
--- a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -64,7 +64,7 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -72,7 +72,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -90,7 +90,7 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -98,7 +98,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -116,7 +116,7 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -124,7 +124,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Order.java
index 69014c229fbf..2e9d3500518a 100644
--- a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Order.java
@@ -116,7 +116,7 @@ public Order id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -124,7 +124,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -142,7 +142,7 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -150,7 +150,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -168,7 +168,7 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -176,7 +176,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -194,7 +194,7 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -202,7 +202,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -220,7 +220,7 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "Order Status")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -228,7 +228,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -246,7 +246,7 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -254,7 +254,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Pet.java
index c45b131e09d5..ff8f48774934 100644
--- a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,7 +120,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -128,7 +128,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -146,7 +146,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -154,7 +154,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -172,7 +172,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(example = "doggie", required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -180,7 +180,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -206,7 +206,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -214,7 +214,7 @@ public List<String> getPhotoUrls() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -240,7 +240,7 @@ public Pet addTagsItem(Tag tagsItem) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -248,7 +248,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -268,7 +268,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
   @Deprecated
   @javax.annotation.Nullable
   @ApiModelProperty(value = "pet status in the store")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -276,7 +276,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Tag.java
index 7e984f126f48..3dfb607fc731 100644
--- a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Tag.java
@@ -58,7 +58,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -66,7 +66,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -84,7 +84,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -92,7 +92,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/User.java
index 95fddc045474..5158eaf8885b 100644
--- a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/User.java
@@ -88,7 +88,7 @@ public User id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -96,7 +96,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -114,7 +114,7 @@ public User username(@javax.annotation.Nullable String username) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -122,7 +122,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -140,7 +140,7 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -148,7 +148,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -166,7 +166,7 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -174,7 +174,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -192,7 +192,7 @@ public User email(@javax.annotation.Nullable String email) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -200,7 +200,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -218,7 +218,7 @@ public User password(@javax.annotation.Nullable String password) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -226,7 +226,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -244,7 +244,7 @@ public User phone(@javax.annotation.Nullable String phone) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -252,7 +252,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -270,7 +270,7 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "User Status")
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -278,7 +278,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Category.java
index a9b888dd4cd2..f8c4e529a56c 100644
--- a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Category.java
@@ -57,7 +57,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -65,7 +65,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -83,7 +83,7 @@ public Category name(@javax.annotation.Nullable String name) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -91,7 +91,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 6176c40dadba..997a3e461e6c 100644
--- a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -63,7 +63,7 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -71,7 +71,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -89,7 +89,7 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -97,7 +97,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -115,7 +115,7 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -123,7 +123,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Order.java
index 41787142a785..100e757009f7 100644
--- a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Order.java
@@ -115,7 +115,7 @@ public Order id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -123,7 +123,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -141,7 +141,7 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -149,7 +149,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -167,7 +167,7 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -175,7 +175,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -193,7 +193,7 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -201,7 +201,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -219,7 +219,7 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "Order Status")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -227,7 +227,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -245,7 +245,7 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -253,7 +253,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Pet.java
index 0e128c205cb2..db08e8eda30d 100644
--- a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Pet.java
@@ -119,7 +119,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -127,7 +127,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -145,7 +145,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -153,7 +153,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -171,7 +171,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    */
   @javax.annotation.Nonnull
   @Schema(example = "doggie", requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -179,7 +179,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -205,7 +205,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -213,7 +213,7 @@ public List<String> getPhotoUrls() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -239,7 +239,7 @@ public Pet addTagsItem(Tag tagsItem) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -247,7 +247,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -267,7 +267,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
   @Deprecated
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "pet status in the store")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -275,7 +275,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Tag.java
index 5216b9cda144..3f85aece796e 100644
--- a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Tag.java
@@ -57,7 +57,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -65,7 +65,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -83,7 +83,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -91,7 +91,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/User.java
index c57e57646c12..2b3e483d69b9 100644
--- a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/User.java
@@ -87,7 +87,7 @@ public User id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -95,7 +95,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -113,7 +113,7 @@ public User username(@javax.annotation.Nullable String username) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -121,7 +121,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -139,7 +139,7 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -147,7 +147,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -165,7 +165,7 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -173,7 +173,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -191,7 +191,7 @@ public User email(@javax.annotation.Nullable String email) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -199,7 +199,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -217,7 +217,7 @@ public User password(@javax.annotation.Nullable String password) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -225,7 +225,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -243,7 +243,7 @@ public User phone(@javax.annotation.Nullable String phone) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -251,7 +251,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -269,7 +269,7 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "User Status")
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -277,7 +277,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 242d8ca23609..482a138c0d38 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -73,7 +73,7 @@ public AdditionalPropertiesClass putMapPropertyItem(String key, String mapProper
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "map_property")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -83,7 +83,7 @@ public Map<String, String> getMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "map_property")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -110,7 +110,7 @@ public AdditionalPropertiesClass putMapOfMapPropertyItem(String key, Map<String,
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "map_of_map_property")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -120,7 +120,7 @@ public Map<String, Map<String, String>> getMapOfMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "map_of_map_property")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 36eba51343f9..0845f287c3d5 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -64,7 +64,7 @@ public AllOfWithSingleRef username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "username")
 
@@ -73,7 +73,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "username")
   public void setUsername(@javax.annotation.Nullable String username) {
@@ -91,7 +91,7 @@ public AllOfWithSingleRef singleRefType(@javax.annotation.Nullable SingleRefType
    * @return singleRefType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "SingleRefType")
 
@@ -100,7 +100,7 @@ public SingleRefType getSingleRefType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "SingleRefType")
   public void setSingleRefType(@javax.annotation.Nullable SingleRefType singleRefType) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Animal.java
index bd3b12b1804d..783832857fff 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Animal.java
@@ -76,7 +76,7 @@ public Animal className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "className")
 
@@ -85,7 +85,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "className")
   public void setClassName(@javax.annotation.Nonnull String className) {
@@ -103,7 +103,7 @@ public Animal color(@javax.annotation.Nullable String color) {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "color")
 
@@ -112,7 +112,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "color")
   public void setColor(@javax.annotation.Nullable String color) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 177df5610b58..924cd367a4e8 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -69,7 +69,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "ArrayArrayNumber")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -79,7 +79,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "ArrayArrayNumber")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index d6f3c47981c6..2ab104858f81 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -69,7 +69,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "ArrayNumber")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -79,7 +79,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "ArrayNumber")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayTest.java
index 13be4100ca53..034a93a516f2 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -81,7 +81,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_of_string")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -91,7 +91,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_of_string")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -118,7 +118,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_array_of_integer")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -128,7 +128,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_array_of_integer")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -155,7 +155,7 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_array_of_model")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -165,7 +165,7 @@ public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_array_of_model")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Capitalization.java
index c227b022f1d8..acbb13b446ca 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -87,7 +87,7 @@ public Capitalization smallCamel(@javax.annotation.Nullable String smallCamel) {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "smallCamel")
 
@@ -96,7 +96,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "smallCamel")
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
@@ -114,7 +114,7 @@ public Capitalization capitalCamel(@javax.annotation.Nullable String capitalCame
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "CapitalCamel")
 
@@ -123,7 +123,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "CapitalCamel")
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
@@ -141,7 +141,7 @@ public Capitalization smallSnake(@javax.annotation.Nullable String smallSnake) {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "small_Snake")
 
@@ -150,7 +150,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "small_Snake")
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
@@ -168,7 +168,7 @@ public Capitalization capitalSnake(@javax.annotation.Nullable String capitalSnak
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "Capital_Snake")
 
@@ -177,7 +177,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "Capital_Snake")
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
@@ -195,7 +195,7 @@ public Capitalization scAETHFlowPoints(@javax.annotation.Nullable String scAETHF
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "SCA_ETH_Flow_Points")
 
@@ -204,7 +204,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "SCA_ETH_Flow_Points")
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
@@ -222,7 +222,7 @@ public Capitalization ATT_NAME(@javax.annotation.Nullable String ATT_NAME) {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "ATT_NAME")
 
@@ -231,7 +231,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "ATT_NAME")
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Cat.java
index c3ae405e068f..23ff83a47582 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Cat.java
@@ -68,7 +68,7 @@ public Cat declawed(@javax.annotation.Nullable Boolean declawed) {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "declawed")
 
@@ -77,7 +77,7 @@ public Boolean getDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "declawed")
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Category.java
index 581723fc0d55..8170f1b187dd 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Category.java
@@ -63,7 +63,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
 
@@ -72,7 +72,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(@javax.annotation.Nullable Long id) {
@@ -90,7 +90,7 @@ public Category name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "name")
 
@@ -99,7 +99,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "name")
   public void setName(@javax.annotation.Nonnull String name) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index b4baa445d17e..8b6509cb7497 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -69,7 +69,7 @@ public ChildWithNullable otherProperty(@javax.annotation.Nullable String otherPr
    * @return otherProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "otherProperty")
 
@@ -78,7 +78,7 @@ public String getOtherProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "otherProperty")
   public void setOtherProperty(@javax.annotation.Nullable String otherProperty) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ClassModel.java
index d75d5dddfcf1..2e8110cefee2 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -57,7 +57,7 @@ public ClassModel propertyClass(@javax.annotation.Nullable String propertyClass)
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "_class")
 
@@ -66,7 +66,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "_class")
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Client.java
index 3021413ca042..2f91972bcf36 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Client.java
@@ -57,7 +57,7 @@ public Client client(@javax.annotation.Nullable String client) {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "client")
 
@@ -66,7 +66,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "client")
   public void setClient(@javax.annotation.Nullable String client) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index b90ba1ce4f91..57691bf0fde7 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -59,7 +59,7 @@ public DeprecatedObject name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "name")
 
@@ -68,7 +68,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "name")
   public void setName(@javax.annotation.Nullable String name) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Dog.java
index 4c8ed978bc48..b13e0a94c174 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Dog.java
@@ -68,7 +68,7 @@ public Dog breed(@javax.annotation.Nullable String breed) {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "breed")
 
@@ -77,7 +77,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "breed")
   public void setBreed(@javax.annotation.Nullable String breed) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/EnumArrays.java
index 6ed3866049ee..e5da7b50a7a1 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -144,7 +144,7 @@ public EnumArrays justSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbo
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "just_symbol")
 
@@ -153,7 +153,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "just_symbol")
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
@@ -179,7 +179,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_enum")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -189,7 +189,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_enum")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/EnumTest.java
index 2bdf264bf9af..fd8bda518e1c 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -270,7 +270,7 @@ public EnumTest enumString(@javax.annotation.Nullable EnumStringEnum enumString)
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "enum_string")
 
@@ -279,7 +279,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "enum_string")
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
@@ -297,7 +297,7 @@ public EnumTest enumStringRequired(@javax.annotation.Nonnull EnumStringRequiredE
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "enum_string_required")
 
@@ -306,7 +306,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "enum_string_required")
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
@@ -324,7 +324,7 @@ public EnumTest enumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteg
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "enum_integer")
 
@@ -333,7 +333,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "enum_integer")
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
@@ -351,7 +351,7 @@ public EnumTest enumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber)
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "enum_number")
 
@@ -360,7 +360,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "enum_number")
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
@@ -384,7 +384,7 @@ public OuterEnum getOuterEnum() {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "outerEnum")
 
@@ -412,7 +412,7 @@ public EnumTest outerEnumInteger(@javax.annotation.Nullable OuterEnumInteger out
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "outerEnumInteger")
 
@@ -421,7 +421,7 @@ public OuterEnumInteger getOuterEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "outerEnumInteger")
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
@@ -439,7 +439,7 @@ public EnumTest outerEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaul
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "outerEnumDefaultValue")
 
@@ -448,7 +448,7 @@ public OuterEnumDefaultValue getOuterEnumDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "outerEnumDefaultValue")
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
@@ -466,7 +466,7 @@ public EnumTest outerEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnu
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "outerEnumIntegerDefaultValue")
 
@@ -475,7 +475,7 @@ public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "outerEnumIntegerDefaultValue")
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index e77f92238184..ab4f4b0b7ab4 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -67,7 +67,7 @@ public FakeBigDecimalMap200Response someId(@javax.annotation.Nullable BigDecimal
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "someId")
 
@@ -76,7 +76,7 @@ public BigDecimal getSomeId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "someId")
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
@@ -102,7 +102,7 @@ public FakeBigDecimalMap200Response putSomeMapItem(String key, BigDecimal someMa
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "someMap")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -112,7 +112,7 @@ public Map<String, BigDecimal> getSomeMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "someMap")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 1bf99d918592..5ce9247f30f0 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -67,7 +67,7 @@ public FileSchemaTestClass _file(@javax.annotation.Nullable ModelFile _file) {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "file")
 
@@ -76,7 +76,7 @@ public ModelFile getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "file")
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
@@ -102,7 +102,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "files")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -112,7 +112,7 @@ public List<ModelFile> getFiles() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "files")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Foo.java
index 411106f81d3c..464c38350197 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Foo.java
@@ -57,7 +57,7 @@ public Foo bar(@javax.annotation.Nullable String bar) {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "bar")
 
@@ -66,7 +66,7 @@ public String getBar() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "bar")
   public void setBar(@javax.annotation.Nullable String bar) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 670fd6be3b71..26535b2afd77 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -59,7 +59,7 @@ public FooGetDefaultResponse string(@javax.annotation.Nullable Foo string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "string")
 
@@ -68,7 +68,7 @@ public Foo getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "string")
   public void setString(@javax.annotation.Nullable Foo string) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FormatTest.java
index 583458682cbb..72274f30520b 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -156,7 +156,7 @@ public FormatTest integer(@javax.annotation.Nullable Integer integer) {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "integer")
 
@@ -165,7 +165,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "integer")
   public void setInteger(@javax.annotation.Nullable Integer integer) {
@@ -185,7 +185,7 @@ public FormatTest int32(@javax.annotation.Nullable Integer int32) {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "int32")
 
@@ -194,7 +194,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "int32")
   public void setInt32(@javax.annotation.Nullable Integer int32) {
@@ -212,7 +212,7 @@ public FormatTest int64(@javax.annotation.Nullable Long int64) {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "int64")
 
@@ -221,7 +221,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "int64")
   public void setInt64(@javax.annotation.Nullable Long int64) {
@@ -241,7 +241,7 @@ public FormatTest number(@javax.annotation.Nonnull BigDecimal number) {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "number")
 
@@ -250,7 +250,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "number")
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
@@ -270,7 +270,7 @@ public FormatTest _float(@javax.annotation.Nullable Float _float) {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "float")
 
@@ -279,7 +279,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "float")
   public void setFloat(@javax.annotation.Nullable Float _float) {
@@ -299,7 +299,7 @@ public FormatTest _double(@javax.annotation.Nullable Double _double) {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "double")
 
@@ -308,7 +308,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "double")
   public void setDouble(@javax.annotation.Nullable Double _double) {
@@ -326,7 +326,7 @@ public FormatTest decimal(@javax.annotation.Nullable BigDecimal decimal) {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "decimal")
 
@@ -335,7 +335,7 @@ public BigDecimal getDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "decimal")
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
@@ -353,7 +353,7 @@ public FormatTest string(@javax.annotation.Nullable String string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "string")
 
@@ -362,7 +362,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "string")
   public void setString(@javax.annotation.Nullable String string) {
@@ -380,7 +380,7 @@ public FormatTest _byte(@javax.annotation.Nonnull byte[] _byte) {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "byte")
 
@@ -389,7 +389,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "byte")
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
@@ -407,7 +407,7 @@ public FormatTest binary(@javax.annotation.Nullable File binary) {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "binary")
 
@@ -416,7 +416,7 @@ public File getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "binary")
   public void setBinary(@javax.annotation.Nullable File binary) {
@@ -434,7 +434,7 @@ public FormatTest date(@javax.annotation.Nonnull LocalDate date) {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "date")
 
@@ -443,7 +443,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "date")
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
@@ -461,7 +461,7 @@ public FormatTest dateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "dateTime")
 
@@ -470,7 +470,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "dateTime")
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
@@ -488,7 +488,7 @@ public FormatTest uuid(@javax.annotation.Nullable UUID uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "uuid")
 
@@ -497,7 +497,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "uuid")
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
@@ -515,7 +515,7 @@ public FormatTest password(@javax.annotation.Nonnull String password) {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "password")
 
@@ -524,7 +524,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "password")
   public void setPassword(@javax.annotation.Nonnull String password) {
@@ -542,7 +542,7 @@ public FormatTest patternWithDigits(@javax.annotation.Nullable String patternWit
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "pattern_with_digits")
 
@@ -551,7 +551,7 @@ public String getPatternWithDigits() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "pattern_with_digits")
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
@@ -569,7 +569,7 @@ public FormatTest patternWithDigitsAndDelimiter(@javax.annotation.Nullable Strin
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "pattern_with_digits_and_delimiter")
 
@@ -578,7 +578,7 @@ public String getPatternWithDigitsAndDelimiter() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "pattern_with_digits_and_delimiter")
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 91c183b9106e..b6cb19ab1d88 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -58,7 +58,7 @@ public HasOnlyReadOnly() {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "bar")
 
@@ -73,7 +73,7 @@ public String getBar() {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "foo")
 
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index e75500ddb99d..a22e31b70776 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -67,7 +67,7 @@ public String getNullableMessage() {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "NullableMessage")
 
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/MapTest.java
index 2ef7b4272100..78211d03b817 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/MapTest.java
@@ -124,7 +124,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "map_map_of_string")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -134,7 +134,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "map_map_of_string")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -161,7 +161,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "map_of_enum_string")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -171,7 +171,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "map_of_enum_string")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -198,7 +198,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "direct_map")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -208,7 +208,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "direct_map")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -235,7 +235,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "indirect_map")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -245,7 +245,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "indirect_map")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index e0ef53a5c0a5..2c01407ff8fc 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -75,7 +75,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@javax.annotation.Nullab
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "uuid")
 
@@ -84,7 +84,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "uuid")
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
@@ -102,7 +102,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@javax.annotation.Nu
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "dateTime")
 
@@ -111,7 +111,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "dateTime")
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
@@ -137,7 +137,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "map")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -147,7 +147,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "map")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Model200Response.java
index 8bb6b85c8326..7c59aa4dee64 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -64,7 +64,7 @@ public Model200Response name(@javax.annotation.Nullable Integer name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "name")
 
@@ -73,7 +73,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "name")
   public void setName(@javax.annotation.Nullable Integer name) {
@@ -91,7 +91,7 @@ public Model200Response propertyClass(@javax.annotation.Nullable String property
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "class")
 
@@ -100,7 +100,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "class")
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 75265236301c..72fdc339cf16 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -70,7 +70,7 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "code")
 
@@ -79,7 +79,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "code")
   public void setCode(@javax.annotation.Nullable Integer code) {
@@ -97,7 +97,7 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "type")
 
@@ -106,7 +106,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "type")
   public void setType(@javax.annotation.Nullable String type) {
@@ -124,7 +124,7 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "message")
 
@@ -133,7 +133,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "message")
   public void setMessage(@javax.annotation.Nullable String message) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelFile.java
index e56c621e8fd0..416f89fe94fa 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -58,7 +58,7 @@ public ModelFile sourceURI(@javax.annotation.Nullable String sourceURI) {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "sourceURI")
 
@@ -67,7 +67,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "sourceURI")
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelList.java
index e585788deb67..fde96b63116d 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelList.java
@@ -58,7 +58,7 @@ public ModelList _123list(@javax.annotation.Nullable String _123list) {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "123-list")
 
@@ -67,7 +67,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "123-list")
   public void set123list(@javax.annotation.Nullable String _123list) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelReturn.java
index 792eeb6c94bc..4ff53326bc14 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -58,7 +58,7 @@ public ModelReturn _return(@javax.annotation.Nullable Integer _return) {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "return")
 
@@ -67,7 +67,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "return")
   public void setReturn(@javax.annotation.Nullable Integer _return) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Name.java
index 56a9edc536d2..32bed7fb99ff 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Name.java
@@ -75,7 +75,7 @@ public Name name(@javax.annotation.Nonnull Integer name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "name")
 
@@ -84,7 +84,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "name")
   public void setName(@javax.annotation.Nonnull Integer name) {
@@ -96,7 +96,7 @@ public void setName(@javax.annotation.Nonnull Integer name) {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "snake_case")
 
@@ -117,7 +117,7 @@ public Name property(@javax.annotation.Nullable String property) {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "property")
 
@@ -126,7 +126,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "property")
   public void setProperty(@javax.annotation.Nullable String property) {
@@ -138,7 +138,7 @@ public void setProperty(@javax.annotation.Nullable String property) {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "123Number")
 
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/NullableClass.java
index f51ea95a1d49..24cb5594c3fc 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -146,7 +146,7 @@ public Integer getIntegerProp() {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "integer_prop")
 
@@ -180,7 +180,7 @@ public BigDecimal getNumberProp() {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "number_prop")
 
@@ -214,7 +214,7 @@ public Boolean getBooleanProp() {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "boolean_prop")
 
@@ -248,7 +248,7 @@ public String getStringProp() {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "string_prop")
 
@@ -282,7 +282,7 @@ public LocalDate getDateProp() {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "date_prop")
 
@@ -316,7 +316,7 @@ public OffsetDateTime getDatetimeProp() {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "datetime_prop")
 
@@ -362,7 +362,7 @@ public List<Object> getArrayNullableProp() {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_nullable_prop")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -409,7 +409,7 @@ public List<Object> getArrayAndItemsNullableProp() {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_and_items_nullable_prop")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -446,7 +446,7 @@ public NullableClass addArrayItemsNullableItem(Object arrayItemsNullableItem) {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_items_nullable")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -456,7 +456,7 @@ public List<Object> getArrayItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_items_nullable")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -493,7 +493,7 @@ public Map<String, Object> getObjectNullableProp() {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "object_nullable_prop")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -540,7 +540,7 @@ public Map<String, Object> getObjectAndItemsNullableProp() {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "object_and_items_nullable_prop")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -577,7 +577,7 @@ public NullableClass putObjectItemsNullableItem(String key, Object objectItemsNu
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "object_items_nullable")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -587,7 +587,7 @@ public Map<String, Object> getObjectItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "object_items_nullable")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/NumberOnly.java
index ff8bb20ac8ed..36b16a82f79c 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -58,7 +58,7 @@ public NumberOnly justNumber(@javax.annotation.Nullable BigDecimal justNumber) {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "JustNumber")
 
@@ -67,7 +67,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "JustNumber")
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index b7363c042b8a..305aac21ad9e 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -80,7 +80,7 @@ public ObjectWithDeprecatedFields uuid(@javax.annotation.Nullable String uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "uuid")
 
@@ -89,7 +89,7 @@ public String getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "uuid")
   public void setUuid(@javax.annotation.Nullable String uuid) {
@@ -109,7 +109,7 @@ public ObjectWithDeprecatedFields id(@javax.annotation.Nullable BigDecimal id) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
 
@@ -118,7 +118,7 @@ public BigDecimal getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(@javax.annotation.Nullable BigDecimal id) {
@@ -138,7 +138,7 @@ public ObjectWithDeprecatedFields deprecatedRef(@javax.annotation.Nullable Depre
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "deprecatedRef")
 
@@ -147,7 +147,7 @@ public DeprecatedObject getDeprecatedRef() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "deprecatedRef")
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
@@ -175,7 +175,7 @@ public ObjectWithDeprecatedFields addBarsItem(String barsItem) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "bars")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -185,7 +185,7 @@ public List<String> getBars() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "bars")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Order.java
index f46236246c66..1ccc2bd9ea9f 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Order.java
@@ -131,7 +131,7 @@ public Order id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
 
@@ -140,7 +140,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(@javax.annotation.Nullable Long id) {
@@ -158,7 +158,7 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "petId")
 
@@ -167,7 +167,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "petId")
   public void setPetId(@javax.annotation.Nullable Long petId) {
@@ -185,7 +185,7 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "quantity")
 
@@ -194,7 +194,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "quantity")
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
@@ -212,7 +212,7 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "shipDate")
 
@@ -221,7 +221,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "shipDate")
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
@@ -239,7 +239,7 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "status")
 
@@ -248,7 +248,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "status")
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
@@ -266,7 +266,7 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "complete")
 
@@ -275,7 +275,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "complete")
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/OuterComposite.java
index 28361ae3864e..0e227ada6781 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -70,7 +70,7 @@ public OuterComposite myNumber(@javax.annotation.Nullable BigDecimal myNumber) {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "my_number")
 
@@ -79,7 +79,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "my_number")
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
@@ -97,7 +97,7 @@ public OuterComposite myString(@javax.annotation.Nullable String myString) {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "my_string")
 
@@ -106,7 +106,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "my_string")
   public void setMyString(@javax.annotation.Nullable String myString) {
@@ -124,7 +124,7 @@ public OuterComposite myBoolean(@javax.annotation.Nullable Boolean myBoolean) {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "my_boolean")
 
@@ -133,7 +133,7 @@ public Boolean getMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "my_boolean")
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 93d5596d1198..4fefe0603b56 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -58,7 +58,7 @@ public OuterObjectWithEnumProperty value(@javax.annotation.Nonnull OuterEnumInte
    * @return value
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "value")
 
@@ -67,7 +67,7 @@ public OuterEnumInteger getValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "value")
   public void setValue(@javax.annotation.Nonnull OuterEnumInteger value) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index d88933b1cfb4..101efbdeac2f 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -115,7 +115,7 @@ public ParentWithNullable type(@javax.annotation.Nullable TypeEnum type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "type")
 
@@ -124,7 +124,7 @@ public TypeEnum getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "type")
   public void setType(@javax.annotation.Nullable TypeEnum type) {
@@ -148,7 +148,7 @@ public String getNullableProperty() {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "nullableProperty")
 
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Pet.java
index 1cf0a2cffca3..fd2f30278a67 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Pet.java
@@ -139,7 +139,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
 
@@ -148,7 +148,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(@javax.annotation.Nullable Long id) {
@@ -166,7 +166,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "Category")
 
@@ -175,7 +175,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "Category")
   public void setCategory(@javax.annotation.Nullable Category category) {
@@ -193,7 +193,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "name")
 
@@ -202,7 +202,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "name")
   public void setName(@javax.annotation.Nonnull String name) {
@@ -228,7 +228,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "photoUrl")
   @JacksonXmlElementWrapper(localName = "photoUrls", useWrapping = true)
@@ -239,7 +239,7 @@ public Set<String> getPhotoUrls() {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "photoUrl")
   @JacksonXmlElementWrapper(localName = "photoUrls", useWrapping = true)
@@ -266,7 +266,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "Tag")
   @JacksonXmlElementWrapper(localName = "tag", useWrapping = true)
@@ -276,7 +276,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "Tag")
   @JacksonXmlElementWrapper(localName = "tag", useWrapping = true)
@@ -295,7 +295,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "status")
 
@@ -304,7 +304,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "status")
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index bed675d6c470..7318d3aa2efb 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -57,7 +57,7 @@ public ReadOnlyFirst() {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "bar")
 
@@ -78,7 +78,7 @@ public ReadOnlyFirst baz(@javax.annotation.Nullable String baz) {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "baz")
 
@@ -87,7 +87,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "baz")
   public void setBaz(@javax.annotation.Nullable String baz) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 5692a8ffc05a..0180d9b08d52 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -58,7 +58,7 @@ public SpecialModelName() {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "$special[property.name]")
 
@@ -67,7 +67,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "$special[property.name]")
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Tag.java
index 63deec6aa431..7d2512597fb5 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Tag.java
@@ -63,7 +63,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
 
@@ -72,7 +72,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(@javax.annotation.Nullable Long id) {
@@ -90,7 +90,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "name")
 
@@ -99,7 +99,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "name")
   public void setName(@javax.annotation.Nullable String name) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 3b9a58e4890e..64966c36c64f 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -62,7 +62,7 @@ public TestInlineFreeformAdditionalPropertiesRequest someProperty(@javax.annotat
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "someProperty")
 
@@ -71,7 +71,7 @@ public String getSomeProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "someProperty")
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/User.java
index ce174a32f859..9ff91f6973f9 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/User.java
@@ -99,7 +99,7 @@ public User id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
 
@@ -108,7 +108,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(@javax.annotation.Nullable Long id) {
@@ -126,7 +126,7 @@ public User username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "username")
 
@@ -135,7 +135,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "username")
   public void setUsername(@javax.annotation.Nullable String username) {
@@ -153,7 +153,7 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "firstName")
 
@@ -162,7 +162,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "firstName")
   public void setFirstName(@javax.annotation.Nullable String firstName) {
@@ -180,7 +180,7 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "lastName")
 
@@ -189,7 +189,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "lastName")
   public void setLastName(@javax.annotation.Nullable String lastName) {
@@ -207,7 +207,7 @@ public User email(@javax.annotation.Nullable String email) {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "email")
 
@@ -216,7 +216,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "email")
   public void setEmail(@javax.annotation.Nullable String email) {
@@ -234,7 +234,7 @@ public User password(@javax.annotation.Nullable String password) {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "password")
 
@@ -243,7 +243,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "password")
   public void setPassword(@javax.annotation.Nullable String password) {
@@ -261,7 +261,7 @@ public User phone(@javax.annotation.Nullable String phone) {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "phone")
 
@@ -270,7 +270,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "phone")
   public void setPhone(@javax.annotation.Nullable String phone) {
@@ -288,7 +288,7 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "userStatus")
 
@@ -297,7 +297,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "userStatus")
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index d57915554204..25fe9138024f 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -72,7 +72,7 @@ public AdditionalPropertiesClass putMapPropertyItem(String key, String mapProper
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -80,7 +80,7 @@ public Map<String, String> getMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -105,7 +105,7 @@ public AdditionalPropertiesClass putMapOfMapPropertyItem(String key, Map<String,
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -113,7 +113,7 @@ public Map<String, Map<String, String>> getMapOfMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 0745fd788db2..13fcc5a391c7 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -63,7 +63,7 @@ public AllOfWithSingleRef username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -71,7 +71,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -88,7 +88,7 @@ public AllOfWithSingleRef singleRefType(@javax.annotation.Nullable SingleRefType
    * @return singleRefType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -96,7 +96,7 @@ public SingleRefType getSingleRefType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@javax.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Animal.java
index e656f84014f8..6fca1d1d2d48 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Animal.java
@@ -75,7 +75,7 @@ public Animal className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -83,7 +83,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -100,7 +100,7 @@ public Animal color(@javax.annotation.Nullable String color) {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -108,7 +108,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 68eaa47867e1..6c667f4b1630 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -68,7 +68,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -76,7 +76,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 08e45d34fe8a..7685fd169e40 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -68,7 +68,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -76,7 +76,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayTest.java
index 75a7a68d82d9..63493fa6c726 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -80,7 +80,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -88,7 +88,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -113,7 +113,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -121,7 +121,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -146,7 +146,7 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -154,7 +154,7 @@ public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Capitalization.java
index 1b196ba18ffe..33761a0eb8a0 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -86,7 +86,7 @@ public Capitalization smallCamel(@javax.annotation.Nullable String smallCamel) {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -94,7 +94,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -111,7 +111,7 @@ public Capitalization capitalCamel(@javax.annotation.Nullable String capitalCame
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -119,7 +119,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -136,7 +136,7 @@ public Capitalization smallSnake(@javax.annotation.Nullable String smallSnake) {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -144,7 +144,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -161,7 +161,7 @@ public Capitalization capitalSnake(@javax.annotation.Nullable String capitalSnak
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -169,7 +169,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -186,7 +186,7 @@ public Capitalization scAETHFlowPoints(@javax.annotation.Nullable String scAETHF
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -194,7 +194,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -211,7 +211,7 @@ public Capitalization ATT_NAME(@javax.annotation.Nullable String ATT_NAME) {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -219,7 +219,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Cat.java
index d9f5bdeda776..193241f5e934 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Cat.java
@@ -68,7 +68,7 @@ public Cat declawed(@javax.annotation.Nullable Boolean declawed) {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -76,7 +76,7 @@ public Boolean getDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Category.java
index af7da4b3118a..1c7af61053b4 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Category.java
@@ -62,7 +62,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -70,7 +70,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -87,7 +87,7 @@ public Category name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -95,7 +95,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index e71f00c644b0..273810754532 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -69,7 +69,7 @@ public ChildWithNullable otherProperty(@javax.annotation.Nullable String otherPr
    * @return otherProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -77,7 +77,7 @@ public String getOtherProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@javax.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ClassModel.java
index bdd3e146dbba..c32568cd448e 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -56,7 +56,7 @@ public ClassModel propertyClass(@javax.annotation.Nullable String propertyClass)
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -64,7 +64,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Client.java
index abc7460a29ec..8c970999d265 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Client.java
@@ -56,7 +56,7 @@ public Client client(@javax.annotation.Nullable String client) {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -64,7 +64,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 447a76daeaeb..fea476cadaa1 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -58,7 +58,7 @@ public DeprecatedObject name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -66,7 +66,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Dog.java
index be1e97c0b18f..5fa2144cbea5 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Dog.java
@@ -68,7 +68,7 @@ public Dog breed(@javax.annotation.Nullable String breed) {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -76,7 +76,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/EnumArrays.java
index a83d6c11f368..73fcd8845c3d 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -135,7 +135,7 @@ public EnumArrays justSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbo
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -143,7 +143,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -168,7 +168,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -176,7 +176,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/EnumTest.java
index 2b8cfa2d739f..b776f50a7869 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -251,7 +251,7 @@ public EnumTest enumString(@javax.annotation.Nullable EnumStringEnum enumString)
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -259,7 +259,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -276,7 +276,7 @@ public EnumTest enumStringRequired(@javax.annotation.Nonnull EnumStringRequiredE
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -284,7 +284,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -301,7 +301,7 @@ public EnumTest enumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteg
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -309,7 +309,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -326,7 +326,7 @@ public EnumTest enumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber)
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -334,7 +334,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -357,7 +357,7 @@ public OuterEnum getOuterEnum() {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -384,7 +384,7 @@ public EnumTest outerEnumInteger(@javax.annotation.Nullable OuterEnumInteger out
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -392,7 +392,7 @@ public OuterEnumInteger getOuterEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -409,7 +409,7 @@ public EnumTest outerEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaul
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -417,7 +417,7 @@ public OuterEnumDefaultValue getOuterEnumDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -434,7 +434,7 @@ public EnumTest outerEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnu
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -442,7 +442,7 @@ public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index ccd467ce2676..a56e73a4f001 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -66,7 +66,7 @@ public FakeBigDecimalMap200Response someId(@javax.annotation.Nullable BigDecimal
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -74,7 +74,7 @@ public BigDecimal getSomeId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -99,7 +99,7 @@ public FakeBigDecimalMap200Response putSomeMapItem(String key, BigDecimal someMa
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -107,7 +107,7 @@ public Map<String, BigDecimal> getSomeMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index c3648ea18b05..acc073c5dbcd 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -66,7 +66,7 @@ public FileSchemaTestClass _file(@javax.annotation.Nullable ModelFile _file) {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -74,7 +74,7 @@ public ModelFile getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -99,7 +99,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -107,7 +107,7 @@ public List<ModelFile> getFiles() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Foo.java
index bbb29bf70e51..9266d04ba8f7 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Foo.java
@@ -56,7 +56,7 @@ public Foo bar(@javax.annotation.Nullable String bar) {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -64,7 +64,7 @@ public String getBar() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 1d6d2eb9c106..26891b2fb276 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -58,7 +58,7 @@ public FooGetDefaultResponse string(@javax.annotation.Nullable Foo string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -66,7 +66,7 @@ public Foo getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FormatTest.java
index f7570a5593e6..08c2f6915102 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -154,7 +154,7 @@ public FormatTest integer(@javax.annotation.Nullable Integer integer) {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -162,7 +162,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -181,7 +181,7 @@ public FormatTest int32(@javax.annotation.Nullable Integer int32) {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -189,7 +189,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -206,7 +206,7 @@ public FormatTest int64(@javax.annotation.Nullable Long int64) {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -214,7 +214,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -233,7 +233,7 @@ public FormatTest number(@javax.annotation.Nonnull BigDecimal number) {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -241,7 +241,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -260,7 +260,7 @@ public FormatTest _float(@javax.annotation.Nullable Float _float) {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -268,7 +268,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -287,7 +287,7 @@ public FormatTest _double(@javax.annotation.Nullable Double _double) {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -295,7 +295,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -312,7 +312,7 @@ public FormatTest decimal(@javax.annotation.Nullable BigDecimal decimal) {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -320,7 +320,7 @@ public BigDecimal getDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -337,7 +337,7 @@ public FormatTest string(@javax.annotation.Nullable String string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -345,7 +345,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -362,7 +362,7 @@ public FormatTest _byte(@javax.annotation.Nonnull byte[] _byte) {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -370,7 +370,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -387,7 +387,7 @@ public FormatTest binary(@javax.annotation.Nullable File binary) {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -395,7 +395,7 @@ public File getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -412,7 +412,7 @@ public FormatTest date(@javax.annotation.Nonnull LocalDate date) {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -420,7 +420,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -437,7 +437,7 @@ public FormatTest dateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -445,7 +445,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -462,7 +462,7 @@ public FormatTest uuid(@javax.annotation.Nullable UUID uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -470,7 +470,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -487,7 +487,7 @@ public FormatTest password(@javax.annotation.Nonnull String password) {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -495,7 +495,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -512,7 +512,7 @@ public FormatTest patternWithDigits(@javax.annotation.Nullable String patternWit
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -520,7 +520,7 @@ public String getPatternWithDigits() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -537,7 +537,7 @@ public FormatTest patternWithDigitsAndDelimiter(@javax.annotation.Nullable Strin
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -545,7 +545,7 @@ public String getPatternWithDigitsAndDelimiter() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 23c960d80840..5c3c707c5528 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -61,7 +61,7 @@ public HasOnlyReadOnly(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -75,7 +75,7 @@ public String getBar() {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 39f4190d3152..67cd8823790a 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -66,7 +66,7 @@ public String getNullableMessage() {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/MapTest.java
index 6faa1d336381..815bf57e4f74 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/MapTest.java
@@ -119,7 +119,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -127,7 +127,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -152,7 +152,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -160,7 +160,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -185,7 +185,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -193,7 +193,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -218,7 +218,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -226,7 +226,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 2467806f93a9..7b23e5d83834 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -73,7 +73,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@javax.annotation.Nullab
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -81,7 +81,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -98,7 +98,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@javax.annotation.Nu
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -106,7 +106,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -131,7 +131,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -139,7 +139,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Model200Response.java
index 4795551603e6..2689a5d2ac38 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -63,7 +63,7 @@ public Model200Response name(@javax.annotation.Nullable Integer name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -71,7 +71,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -88,7 +88,7 @@ public Model200Response propertyClass(@javax.annotation.Nullable String property
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -96,7 +96,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index b5ed8bc0cd5e..53f9476c1ca4 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -69,7 +69,7 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -77,7 +77,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -94,7 +94,7 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -102,7 +102,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -119,7 +119,7 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -127,7 +127,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelFile.java
index f96c871d3111..c514bbde62ae 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -57,7 +57,7 @@ public ModelFile sourceURI(@javax.annotation.Nullable String sourceURI) {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -65,7 +65,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelList.java
index 27eef80a4e9c..99043eed4eec 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelList.java
@@ -57,7 +57,7 @@ public ModelList _123list(@javax.annotation.Nullable String _123list) {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -65,7 +65,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelReturn.java
index a66786be5755..f75c6297ec29 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -57,7 +57,7 @@ public ModelReturn _return(@javax.annotation.Nullable Integer _return) {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -65,7 +65,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Name.java
index 8e88936d6492..fb8a9af54cf2 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Name.java
@@ -86,7 +86,7 @@ public Name name(@javax.annotation.Nonnull Integer name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -94,7 +94,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -105,7 +105,7 @@ public void setName(@javax.annotation.Nonnull Integer name) {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -125,7 +125,7 @@ public Name property(@javax.annotation.Nullable String property) {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -133,7 +133,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -144,7 +144,7 @@ public void setProperty(@javax.annotation.Nullable String property) {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/NullableClass.java
index c5dc6cf09b8d..c42ac07ee879 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -144,7 +144,7 @@ public Integer getIntegerProp() {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -177,7 +177,7 @@ public BigDecimal getNumberProp() {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -210,7 +210,7 @@ public Boolean getBooleanProp() {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -243,7 +243,7 @@ public String getStringProp() {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -276,7 +276,7 @@ public LocalDate getDateProp() {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -309,7 +309,7 @@ public OffsetDateTime getDatetimeProp() {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -354,7 +354,7 @@ public List<Object> getArrayNullableProp() {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -399,7 +399,7 @@ public List<Object> getArrayAndItemsNullableProp() {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -434,7 +434,7 @@ public NullableClass addArrayItemsNullableItem(Object arrayItemsNullableItem) {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -442,7 +442,7 @@ public List<Object> getArrayItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -477,7 +477,7 @@ public Map<String, Object> getObjectNullableProp() {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -522,7 +522,7 @@ public Map<String, Object> getObjectAndItemsNullableProp() {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -557,7 +557,7 @@ public NullableClass putObjectItemsNullableItem(String key, Object objectItemsNu
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -565,7 +565,7 @@ public Map<String, Object> getObjectItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/NumberOnly.java
index 59c0e5c7036d..0614b2dcf73b 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -57,7 +57,7 @@ public NumberOnly justNumber(@javax.annotation.Nullable BigDecimal justNumber) {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -65,7 +65,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index aaf78218292f..05780202b4b9 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -79,7 +79,7 @@ public ObjectWithDeprecatedFields uuid(@javax.annotation.Nullable String uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -87,7 +87,7 @@ public String getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -106,7 +106,7 @@ public ObjectWithDeprecatedFields id(@javax.annotation.Nullable BigDecimal id) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -114,7 +114,7 @@ public BigDecimal getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -133,7 +133,7 @@ public ObjectWithDeprecatedFields deprecatedRef(@javax.annotation.Nullable Depre
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -141,7 +141,7 @@ public DeprecatedObject getDeprecatedRef() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -168,7 +168,7 @@ public ObjectWithDeprecatedFields addBarsItem(String barsItem) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -176,7 +176,7 @@ public List<String> getBars() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Order.java
index b3c043ff6851..ed7cf739d160 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Order.java
@@ -124,7 +124,7 @@ public Order id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -132,7 +132,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -149,7 +149,7 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -157,7 +157,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -174,7 +174,7 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -182,7 +182,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -199,7 +199,7 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -207,7 +207,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -224,7 +224,7 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -232,7 +232,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -249,7 +249,7 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -257,7 +257,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/OuterComposite.java
index 7c3ad3dac7ab..edba33839e2f 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -69,7 +69,7 @@ public OuterComposite myNumber(@javax.annotation.Nullable BigDecimal myNumber) {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -77,7 +77,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -94,7 +94,7 @@ public OuterComposite myString(@javax.annotation.Nullable String myString) {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -102,7 +102,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -119,7 +119,7 @@ public OuterComposite myBoolean(@javax.annotation.Nullable Boolean myBoolean) {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -127,7 +127,7 @@ public Boolean getMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 74eea24facd0..e7007add83f2 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -57,7 +57,7 @@ public OuterObjectWithEnumProperty value(@javax.annotation.Nonnull OuterEnumInte
    * @return value
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -65,7 +65,7 @@ public OuterEnumInteger getValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@javax.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index 0e5b563e2cca..6ebc8691f160 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -111,7 +111,7 @@ public ParentWithNullable type(@javax.annotation.Nullable TypeEnum type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -119,7 +119,7 @@ public TypeEnum getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -142,7 +142,7 @@ public String getNullableProperty() {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Pet.java
index 0235faf1c895..36b85bc75a55 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Pet.java
@@ -131,7 +131,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -139,7 +139,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -156,7 +156,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -164,7 +164,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -181,7 +181,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -189,7 +189,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -214,7 +214,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -223,7 +223,7 @@ public Set<String> getPhotoUrls() {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -248,7 +248,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -256,7 +256,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -273,7 +273,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -281,7 +281,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 9a8e08ff94b2..f3653c04afa0 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -66,7 +66,7 @@ public ReadOnlyFirst(@JsonProperty(JSON_PROPERTY_BAR) String bar, @JsonProperty(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -86,7 +86,7 @@ public ReadOnlyFirst baz(@javax.annotation.Nullable String baz) {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -94,7 +94,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 41dedd77ba06..74eeffc764c7 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -57,7 +57,7 @@ public SpecialModelName(@JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME) Lon
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -65,7 +65,7 @@ public SpecialModelName(@JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME) Lon
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Tag.java
index 2c8848da5da5..fa47a3127ca2 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Tag.java
@@ -62,7 +62,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -70,7 +70,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -87,7 +87,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -95,7 +95,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 958356694961..b1e4b247a72c 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -61,7 +61,7 @@ public TestInlineFreeformAdditionalPropertiesRequest someProperty(@javax.annotat
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -69,7 +69,7 @@ public String getSomeProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/User.java
index 2cd6c9322dc9..87c10de04ff9 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/User.java
@@ -98,7 +98,7 @@ public User id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -106,7 +106,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -123,7 +123,7 @@ public User username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -131,7 +131,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -148,7 +148,7 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -156,7 +156,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -173,7 +173,7 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -181,7 +181,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -198,7 +198,7 @@ public User email(@javax.annotation.Nullable String email) {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -206,7 +206,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -223,7 +223,7 @@ public User password(@javax.annotation.Nullable String password) {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -231,7 +231,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -248,7 +248,7 @@ public User phone(@javax.annotation.Nullable String phone) {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -256,7 +256,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -273,7 +273,7 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -281,7 +281,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
index 24feb50ff309..ec9fcbf2579f 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
@@ -55,7 +55,7 @@ public AdditionalPropertiesAnyType name(@jakarta.annotation.Nullable String name
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -63,7 +63,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
index e6fdd339e524..b47e8f7a5023 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
@@ -56,7 +56,7 @@ public AdditionalPropertiesArray name(@jakarta.annotation.Nullable String name)
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
index b66bc5c2277a..eb88f2a222fc 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
@@ -55,7 +55,7 @@ public AdditionalPropertiesBoolean name(@jakarta.annotation.Nullable String name
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -63,7 +63,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 12a9ac9039d3..6fb3b9c3ce09 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -114,7 +114,7 @@ public AdditionalPropertiesClass putMapStringItem(String key, String mapStringIt
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapString() {
@@ -122,7 +122,7 @@ public Map<String, String> getMapString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapString(@jakarta.annotation.Nullable Map<String, String> mapString) {
     this.mapString = mapString;
@@ -149,7 +149,7 @@ public AdditionalPropertiesClass putMapNumberItem(String key, BigDecimal mapNumb
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getMapNumber() {
@@ -157,7 +157,7 @@ public Map<String, BigDecimal> getMapNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapNumber(@jakarta.annotation.Nullable Map<String, BigDecimal> mapNumber) {
     this.mapNumber = mapNumber;
@@ -183,7 +183,7 @@ public AdditionalPropertiesClass putMapIntegerItem(String key, Integer mapIntege
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Integer> getMapInteger() {
@@ -191,7 +191,7 @@ public Map<String, Integer> getMapInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapInteger(@jakarta.annotation.Nullable Map<String, Integer> mapInteger) {
     this.mapInteger = mapInteger;
@@ -217,7 +217,7 @@ public AdditionalPropertiesClass putMapBooleanItem(String key, Boolean mapBoolea
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getMapBoolean() {
@@ -225,7 +225,7 @@ public Map<String, Boolean> getMapBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapBoolean(@jakarta.annotation.Nullable Map<String, Boolean> mapBoolean) {
     this.mapBoolean = mapBoolean;
@@ -252,7 +252,7 @@ public AdditionalPropertiesClass putMapArrayIntegerItem(String key, List<Integer
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Integer>> getMapArrayInteger() {
@@ -260,7 +260,7 @@ public Map<String, List<Integer>> getMapArrayInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayInteger(@jakarta.annotation.Nullable Map<String, List<Integer>> mapArrayInteger) {
     this.mapArrayInteger = mapArrayInteger;
@@ -287,7 +287,7 @@ public AdditionalPropertiesClass putMapArrayAnytypeItem(String key, List<Object>
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Object>> getMapArrayAnytype() {
@@ -295,7 +295,7 @@ public Map<String, List<Object>> getMapArrayAnytype() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayAnytype(@jakarta.annotation.Nullable Map<String, List<Object>> mapArrayAnytype) {
     this.mapArrayAnytype = mapArrayAnytype;
@@ -322,7 +322,7 @@ public AdditionalPropertiesClass putMapMapStringItem(String key, Map<String, Str
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapString() {
@@ -330,7 +330,7 @@ public Map<String, Map<String, String>> getMapMapString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapString(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapMapString) {
     this.mapMapString = mapMapString;
@@ -357,7 +357,7 @@ public AdditionalPropertiesClass putMapMapAnytypeItem(String key, Map<String, Ob
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, Object>> getMapMapAnytype() {
@@ -365,7 +365,7 @@ public Map<String, Map<String, Object>> getMapMapAnytype() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapAnytype(@jakarta.annotation.Nullable Map<String, Map<String, Object>> mapMapAnytype) {
     this.mapMapAnytype = mapMapAnytype;
@@ -383,7 +383,7 @@ public AdditionalPropertiesClass anytype1(@jakarta.annotation.Nullable Object an
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype1() {
@@ -391,7 +391,7 @@ public Object getAnytype1() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype1(@jakarta.annotation.Nullable Object anytype1) {
     this.anytype1 = anytype1;
@@ -409,7 +409,7 @@ public AdditionalPropertiesClass anytype2(@jakarta.annotation.Nullable Object an
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype2() {
@@ -417,7 +417,7 @@ public Object getAnytype2() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype2(@jakarta.annotation.Nullable Object anytype2) {
     this.anytype2 = anytype2;
@@ -435,7 +435,7 @@ public AdditionalPropertiesClass anytype3(@jakarta.annotation.Nullable Object an
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype3() {
@@ -443,7 +443,7 @@ public Object getAnytype3() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype3(@jakarta.annotation.Nullable Object anytype3) {
     this.anytype3 = anytype3;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
index 5d87b096b5fc..baf00deadaa0 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
@@ -55,7 +55,7 @@ public AdditionalPropertiesInteger name(@jakarta.annotation.Nullable String name
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -63,7 +63,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
index cf7f85c42b4d..d286687d7af2 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
@@ -56,7 +56,7 @@ public AdditionalPropertiesNumber name(@jakarta.annotation.Nullable String name)
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
index 0c5679817521..07a1dad56de2 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
@@ -55,7 +55,7 @@ public AdditionalPropertiesObject name(@jakarta.annotation.Nullable String name)
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -63,7 +63,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
index 7c5100e82a9f..eb087fa6a54e 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
@@ -55,7 +55,7 @@ public AdditionalPropertiesString name(@jakarta.annotation.Nullable String name)
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -63,7 +63,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Animal.java
index 55c92fadd249..30248aafa25e 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Animal.java
@@ -72,7 +72,7 @@ public Animal className(@jakarta.annotation.Nonnull String className) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -80,7 +80,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
@@ -98,7 +98,7 @@ public Animal color(@jakarta.annotation.Nullable String color) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -106,7 +106,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@jakarta.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index a94d74245de4..0025e6920f25 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -65,7 +65,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -73,7 +73,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@jakarta.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 3ca0ea61fce3..e1c0a9378862 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -65,7 +65,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -73,7 +73,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@jakarta.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayTest.java
index 820f5b225368..416f33120530 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -74,7 +74,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -82,7 +82,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@jakarta.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -109,7 +109,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -117,7 +117,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@jakarta.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -144,7 +144,7 @@ public ArrayTest addArrayArrayOfModelItem(List<@Valid ReadOnlyFirst> arrayArrayO
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<@Valid ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -152,7 +152,7 @@ public ArrayTest addArrayArrayOfModelItem(List<@Valid ReadOnlyFirst> arrayArrayO
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@jakarta.annotation.Nullable List<List<@Valid ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/BigCat.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/BigCat.java
index fbe7270c293f..b5c0bb566747 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/BigCat.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/BigCat.java
@@ -102,7 +102,7 @@ public BigCat kind(@jakarta.annotation.Nullable KindEnum kind) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public KindEnum getKind() {
@@ -110,7 +110,7 @@ public KindEnum getKind() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setKind(@jakarta.annotation.Nullable KindEnum kind) {
     this.kind = kind;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Capitalization.java
index c5d326f16f18..8a381142e4f8 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -77,7 +77,7 @@ public Capitalization smallCamel(@jakarta.annotation.Nullable String smallCamel)
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -85,7 +85,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@jakarta.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -103,7 +103,7 @@ public Capitalization capitalCamel(@jakarta.annotation.Nullable String capitalCa
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -111,7 +111,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@jakarta.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -129,7 +129,7 @@ public Capitalization smallSnake(@jakarta.annotation.Nullable String smallSnake)
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -137,7 +137,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@jakarta.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -155,7 +155,7 @@ public Capitalization capitalSnake(@jakarta.annotation.Nullable String capitalSn
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -163,7 +163,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@jakarta.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -181,7 +181,7 @@ public Capitalization scAETHFlowPoints(@jakarta.annotation.Nullable String scAET
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -189,7 +189,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@jakarta.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -207,7 +207,7 @@ public Capitalization ATT_NAME(@jakarta.annotation.Nullable String ATT_NAME) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -215,7 +215,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@jakarta.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Cat.java
index 837cadcf8a7e..bef47c3fcba4 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Cat.java
@@ -66,7 +66,7 @@ public Cat declawed(@jakarta.annotation.Nullable Boolean declawed) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -74,7 +74,7 @@ public Boolean getDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@jakarta.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Category.java
index d283446a06aa..63cb6e850427 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Category.java
@@ -57,7 +57,7 @@ public Category id(@jakarta.annotation.Nullable Long id) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -65,7 +65,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -84,7 +84,7 @@ public Category name(@jakarta.annotation.Nonnull String name) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -92,7 +92,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ClassModel.java
index a8fea09b4c72..a17bc37ce695 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -52,7 +52,7 @@ public ClassModel propertyClass(@jakarta.annotation.Nullable String propertyClas
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -60,7 +60,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Client.java
index c90e376b55f9..00437fb62184 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Client.java
@@ -52,7 +52,7 @@ public Client client(@jakarta.annotation.Nullable String client) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -60,7 +60,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@jakarta.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Dog.java
index 150e6ff0509e..fb196d343d85 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Dog.java
@@ -63,7 +63,7 @@ public Dog breed(@jakarta.annotation.Nullable String breed) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -71,7 +71,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@jakarta.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/EnumArrays.java
index 3111965bc9b9..73f11a45cd83 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -130,7 +130,7 @@ public EnumArrays justSymbol(@jakarta.annotation.Nullable JustSymbolEnum justSym
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -138,7 +138,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@jakarta.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -164,7 +164,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -172,7 +172,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@jakarta.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/EnumTest.java
index a3225f180d63..2e63214f699f 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -218,7 +218,7 @@ public EnumTest enumString(@jakarta.annotation.Nullable EnumStringEnum enumStrin
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -226,7 +226,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@jakarta.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -245,7 +245,7 @@ public EnumTest enumStringRequired(@jakarta.annotation.Nonnull EnumStringRequire
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -253,7 +253,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@jakarta.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -271,7 +271,7 @@ public EnumTest enumInteger(@jakarta.annotation.Nullable EnumIntegerEnum enumInt
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -279,7 +279,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@jakarta.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -297,7 +297,7 @@ public EnumTest enumNumber(@jakarta.annotation.Nullable EnumNumberEnum enumNumbe
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -305,7 +305,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@jakarta.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -324,7 +324,7 @@ public EnumTest outerEnum(@jakarta.annotation.Nullable OuterEnum outerEnum) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnum getOuterEnum() {
@@ -332,7 +332,7 @@ public OuterEnum getOuterEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnum(@jakarta.annotation.Nullable OuterEnum outerEnum) {
     this.outerEnum = outerEnum;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 88c48006452a..25f5e6eb7603 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -62,7 +62,7 @@ public FileSchemaTestClass _file(@jakarta.annotation.Nullable ModelFile _file) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -70,7 +70,7 @@ public ModelFile getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@jakarta.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -97,7 +97,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<@Valid ModelFile> getFiles() {
@@ -105,7 +105,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@jakarta.annotation.Nullable List<@Valid ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/FormatTest.java
index 31c52473fcb7..aad6b3217a80 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -125,7 +125,7 @@ public FormatTest integer(@jakarta.annotation.Nullable Integer integer) {
    */
   @jakarta.annotation.Nullable
  @Min(10) @Max(100)
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -133,7 +133,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@jakarta.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -153,7 +153,7 @@ public FormatTest int32(@jakarta.annotation.Nullable Integer int32) {
    */
   @jakarta.annotation.Nullable
  @Min(20) @Max(200)
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -161,7 +161,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@jakarta.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -179,7 +179,7 @@ public FormatTest int64(@jakarta.annotation.Nullable Long int64) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -187,7 +187,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@jakarta.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -209,7 +209,7 @@ public FormatTest number(@jakarta.annotation.Nonnull BigDecimal number) {
   @NotNull
   @Valid
  @DecimalMin("32.1") @DecimalMax("543.2")
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -217,7 +217,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@jakarta.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -237,7 +237,7 @@ public FormatTest _float(@jakarta.annotation.Nullable Float _float) {
    */
   @jakarta.annotation.Nullable
  @DecimalMin("54.3") @DecimalMax("987.6")
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -245,7 +245,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@jakarta.annotation.Nullable Float _float) {
     this._float = _float;
@@ -265,7 +265,7 @@ public FormatTest _double(@jakarta.annotation.Nullable Double _double) {
    */
   @jakarta.annotation.Nullable
  @DecimalMin("67.8") @DecimalMax("123.4")
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -273,7 +273,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@jakarta.annotation.Nullable Double _double) {
     this._double = _double;
@@ -291,7 +291,7 @@ public FormatTest string(@jakarta.annotation.Nullable String string) {
    */
   @jakarta.annotation.Nullable
  @Pattern(regexp="/[a-z]/i")
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -299,7 +299,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable String string) {
     this.string = string;
@@ -318,7 +318,7 @@ public FormatTest _byte(@jakarta.annotation.Nonnull byte[] _byte) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -326,7 +326,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@jakarta.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -345,7 +345,7 @@ public FormatTest binary(@jakarta.annotation.Nullable File binary) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -353,7 +353,7 @@ public File getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@jakarta.annotation.Nullable File binary) {
     this.binary = binary;
@@ -373,7 +373,7 @@ public FormatTest date(@jakarta.annotation.Nonnull LocalDate date) {
   @NotNull
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -381,7 +381,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@jakarta.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -400,7 +400,7 @@ public FormatTest dateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime)
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -408,7 +408,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -427,7 +427,7 @@ public FormatTest uuid(@jakarta.annotation.Nullable UUID uuid) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -435,7 +435,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -454,7 +454,7 @@ public FormatTest password(@jakarta.annotation.Nonnull String password) {
   @jakarta.annotation.Nonnull
   @NotNull
  @Size(min=10,max=64)
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -462,7 +462,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@jakarta.annotation.Nonnull String password) {
     this.password = password;
@@ -481,7 +481,7 @@ public FormatTest bigDecimal(@jakarta.annotation.Nullable BigDecimal bigDecimal)
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getBigDecimal() {
@@ -489,7 +489,7 @@ public BigDecimal getBigDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBigDecimal(@jakarta.annotation.Nullable BigDecimal bigDecimal) {
     this.bigDecimal = bigDecimal;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 5676d4d669b7..3e6e7adf8a20 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -50,8 +50,8 @@ public HasOnlyReadOnly() {
    */
   @JsonCreator
   public HasOnlyReadOnly(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar, 
-    @JsonProperty(JSON_PROPERTY_FOO) String foo
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar, 
+    @JsonProperty(value = JSON_PROPERTY_FOO, required = false) String foo
   ) {
     this();
     this.bar = bar;
@@ -64,7 +64,7 @@ public HasOnlyReadOnly(
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -79,7 +79,7 @@ public String getBar() {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/MapTest.java
index d889b61b58e3..9cc93246f239 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/MapTest.java
@@ -113,7 +113,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -121,7 +121,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -147,7 +147,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -155,7 +155,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@jakarta.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -181,7 +181,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -189,7 +189,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@jakarta.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -215,7 +215,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -223,7 +223,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@jakarta.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index b33039a1c1da..c724e350cf65 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -68,7 +68,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@jakarta.annotation.Null
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -76,7 +76,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -95,7 +95,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@jakarta.annotation.
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -103,7 +103,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -130,7 +130,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -138,7 +138,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@jakarta.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Model200Response.java
index 617ca4c8e86b..17ea27c99c45 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -58,7 +58,7 @@ public Model200Response name(@jakarta.annotation.Nullable Integer name) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -66,7 +66,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable Integer name) {
     this.name = name;
@@ -84,7 +84,7 @@ public Model200Response propertyClass(@jakarta.annotation.Nullable String proper
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -92,7 +92,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 4b4d8e059ef5..118136a2f96c 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -63,7 +63,7 @@ public ModelApiResponse code(@jakarta.annotation.Nullable Integer code) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -71,7 +71,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@jakarta.annotation.Nullable Integer code) {
     this.code = code;
@@ -89,7 +89,7 @@ public ModelApiResponse type(@jakarta.annotation.Nullable String type) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -97,7 +97,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable String type) {
     this.type = type;
@@ -115,7 +115,7 @@ public ModelApiResponse message(@jakarta.annotation.Nullable String message) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -123,7 +123,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@jakarta.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelFile.java
index 60190106d6ee..d0b112a17a10 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -53,7 +53,7 @@ public ModelFile sourceURI(@jakarta.annotation.Nullable String sourceURI) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -61,7 +61,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@jakarta.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelList.java
index 2475d341a058..98ebacfd9efb 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelList.java
@@ -53,7 +53,7 @@ public ModelList _123list(@jakarta.annotation.Nullable String _123list) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -61,7 +61,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@jakarta.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelReturn.java
index 6ee3264789b9..7ae7cbcffa54 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -53,7 +53,7 @@ public ModelReturn _return(@jakarta.annotation.Nullable Integer _return) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -61,7 +61,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@jakarta.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Name.java
index f60920627402..2bd3e5492eb2 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Name.java
@@ -59,8 +59,8 @@ public Name() {
    */
   @JsonCreator
   public Name(
-    @JsonProperty(JSON_PROPERTY_SNAKE_CASE) Integer snakeCase, 
-    @JsonProperty(JSON_PROPERTY_123NUMBER) Integer _123number
+    @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false) Integer snakeCase, 
+    @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false) Integer _123number
   ) {
     this();
     this.snakeCase = snakeCase;
@@ -80,7 +80,7 @@ public Name name(@jakarta.annotation.Nonnull Integer name) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -88,7 +88,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull Integer name) {
     this.name = name;
@@ -100,7 +100,7 @@ public void setName(@jakarta.annotation.Nonnull Integer name) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -121,7 +121,7 @@ public Name property(@jakarta.annotation.Nullable String property) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -129,7 +129,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@jakarta.annotation.Nullable String property) {
     this.property = property;
@@ -141,7 +141,7 @@ public void setProperty(@jakarta.annotation.Nullable String property) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/NumberOnly.java
index b3fe88fe6ccc..a2ac58abead2 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -54,7 +54,7 @@ public NumberOnly justNumber(@jakarta.annotation.Nullable BigDecimal justNumber)
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -62,7 +62,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@jakarta.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Order.java
index de7fd78ad083..49a30f7ad99e 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Order.java
@@ -115,7 +115,7 @@ public Order id(@jakarta.annotation.Nullable Long id) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -123,7 +123,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -141,7 +141,7 @@ public Order petId(@jakarta.annotation.Nullable Long petId) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -149,7 +149,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@jakarta.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -167,7 +167,7 @@ public Order quantity(@jakarta.annotation.Nullable Integer quantity) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -175,7 +175,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@jakarta.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -194,7 +194,7 @@ public Order shipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -202,7 +202,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -220,7 +220,7 @@ public Order status(@jakarta.annotation.Nullable StatusEnum status) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -228,7 +228,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -246,7 +246,7 @@ public Order complete(@jakarta.annotation.Nullable Boolean complete) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -254,7 +254,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@jakarta.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/OuterComposite.java
index f19f97776cb0..4290c145782e 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -64,7 +64,7 @@ public OuterComposite myNumber(@jakarta.annotation.Nullable BigDecimal myNumber)
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -72,7 +72,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@jakarta.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -90,7 +90,7 @@ public OuterComposite myString(@jakarta.annotation.Nullable String myString) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -98,7 +98,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@jakarta.annotation.Nullable String myString) {
     this.myString = myString;
@@ -116,7 +116,7 @@ public OuterComposite myBoolean(@jakarta.annotation.Nullable Boolean myBoolean)
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -124,7 +124,7 @@ public Boolean getMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@jakarta.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Pet.java
index 50807a235e00..7fdc844f8522 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Pet.java
@@ -122,7 +122,7 @@ public Pet id(@jakarta.annotation.Nullable Long id) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -130,7 +130,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -149,7 +149,7 @@ public Pet category(@jakarta.annotation.Nullable Category category) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -157,7 +157,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@jakarta.annotation.Nullable Category category) {
     this.category = category;
@@ -176,7 +176,7 @@ public Pet name(@jakarta.annotation.Nonnull String name) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -184,7 +184,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
@@ -211,7 +211,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -220,7 +220,7 @@ public Set<String> getPhotoUrls() {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@jakarta.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -247,7 +247,7 @@ public Pet addTagsItem(Tag tagsItem) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<@Valid Tag> getTags() {
@@ -255,7 +255,7 @@ public Pet addTagsItem(Tag tagsItem) {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@jakarta.annotation.Nullable List<@Valid Tag> tags) {
     this.tags = tags;
@@ -273,7 +273,7 @@ public Pet status(@jakarta.annotation.Nullable StatusEnum status) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -281,7 +281,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index bde198f2c9d7..aa9a5b04c0f1 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -49,7 +49,7 @@ public ReadOnlyFirst() {
    */
   @JsonCreator
   public ReadOnlyFirst(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar
   ) {
     this();
     this.bar = bar;
@@ -61,7 +61,7 @@ public ReadOnlyFirst(
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -82,7 +82,7 @@ public ReadOnlyFirst baz(@jakarta.annotation.Nullable String baz) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -90,7 +90,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@jakarta.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/SpecialModelName.java
index e540890b87b0..73f86c0b794f 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -53,7 +53,7 @@ public SpecialModelName() {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -61,7 +61,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@jakarta.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Tag.java
index b6339f114da6..9f0e79451b60 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Tag.java
@@ -57,7 +57,7 @@ public Tag id(@jakarta.annotation.Nullable Long id) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -65,7 +65,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -83,7 +83,7 @@ public Tag name(@jakarta.annotation.Nullable String name) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -91,7 +91,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/TypeHolderDefault.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
index b494f6f622cc..918d24154ebe 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
@@ -77,7 +77,7 @@ public TypeHolderDefault stringItem(@jakarta.annotation.Nonnull String stringIte
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -85,7 +85,7 @@ public String getStringItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@jakarta.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -105,7 +105,7 @@ public TypeHolderDefault numberItem(@jakarta.annotation.Nonnull BigDecimal numbe
   @NotNull
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -113,7 +113,7 @@ public BigDecimal getNumberItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@jakarta.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -132,7 +132,7 @@ public TypeHolderDefault integerItem(@jakarta.annotation.Nonnull Integer integer
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -140,7 +140,7 @@ public Integer getIntegerItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@jakarta.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -159,7 +159,7 @@ public TypeHolderDefault boolItem(@jakarta.annotation.Nonnull Boolean boolItem)
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean getBoolItem() {
@@ -167,7 +167,7 @@ public Boolean getBoolItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@jakarta.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -194,7 +194,7 @@ public TypeHolderDefault addArrayItemItem(Integer arrayItemItem) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -202,7 +202,7 @@ public List<Integer> getArrayItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@jakarta.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/TypeHolderExample.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/TypeHolderExample.java
index 8690d8ae8d78..28b8ac2210a7 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/TypeHolderExample.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/TypeHolderExample.java
@@ -82,7 +82,7 @@ public TypeHolderExample stringItem(@jakarta.annotation.Nonnull String stringIte
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -90,7 +90,7 @@ public String getStringItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@jakarta.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -110,7 +110,7 @@ public TypeHolderExample numberItem(@jakarta.annotation.Nonnull BigDecimal numbe
   @NotNull
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -118,7 +118,7 @@ public BigDecimal getNumberItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@jakarta.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -137,7 +137,7 @@ public TypeHolderExample floatItem(@jakarta.annotation.Nonnull Float floatItem)
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Float getFloatItem() {
@@ -145,7 +145,7 @@ public Float getFloatItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setFloatItem(@jakarta.annotation.Nonnull Float floatItem) {
     this.floatItem = floatItem;
@@ -164,7 +164,7 @@ public TypeHolderExample integerItem(@jakarta.annotation.Nonnull Integer integer
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -172,7 +172,7 @@ public Integer getIntegerItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@jakarta.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -191,7 +191,7 @@ public TypeHolderExample boolItem(@jakarta.annotation.Nonnull Boolean boolItem)
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean getBoolItem() {
@@ -199,7 +199,7 @@ public Boolean getBoolItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@jakarta.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -226,7 +226,7 @@ public TypeHolderExample addArrayItemItem(Integer arrayItemItem) {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -234,7 +234,7 @@ public List<Integer> getArrayItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@jakarta.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/User.java
index 66c909d8d20b..6587aaca1662 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/User.java
@@ -87,7 +87,7 @@ public User id(@jakarta.annotation.Nullable Long id) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -95,7 +95,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -113,7 +113,7 @@ public User username(@jakarta.annotation.Nullable String username) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -121,7 +121,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -139,7 +139,7 @@ public User firstName(@jakarta.annotation.Nullable String firstName) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -147,7 +147,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@jakarta.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -165,7 +165,7 @@ public User lastName(@jakarta.annotation.Nullable String lastName) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -173,7 +173,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@jakarta.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -191,7 +191,7 @@ public User email(@jakarta.annotation.Nullable String email) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -199,7 +199,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@jakarta.annotation.Nullable String email) {
     this.email = email;
@@ -217,7 +217,7 @@ public User password(@jakarta.annotation.Nullable String password) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -225,7 +225,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@jakarta.annotation.Nullable String password) {
     this.password = password;
@@ -243,7 +243,7 @@ public User phone(@jakarta.annotation.Nullable String phone) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -251,7 +251,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@jakarta.annotation.Nullable String phone) {
     this.phone = phone;
@@ -269,7 +269,7 @@ public User userStatus(@jakarta.annotation.Nullable Integer userStatus) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -277,7 +277,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@jakarta.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/XmlItem.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/XmlItem.java
index 8916fad1acf4..ab284d746cef 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/XmlItem.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/XmlItem.java
@@ -196,7 +196,7 @@ public XmlItem attributeString(@jakarta.annotation.Nullable String attributeStri
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAttributeString() {
@@ -204,7 +204,7 @@ public String getAttributeString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeString(@jakarta.annotation.Nullable String attributeString) {
     this.attributeString = attributeString;
@@ -223,7 +223,7 @@ public XmlItem attributeNumber(@jakarta.annotation.Nullable BigDecimal attribute
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getAttributeNumber() {
@@ -231,7 +231,7 @@ public BigDecimal getAttributeNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeNumber(@jakarta.annotation.Nullable BigDecimal attributeNumber) {
     this.attributeNumber = attributeNumber;
@@ -249,7 +249,7 @@ public XmlItem attributeInteger(@jakarta.annotation.Nullable Integer attributeIn
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getAttributeInteger() {
@@ -257,7 +257,7 @@ public Integer getAttributeInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeInteger(@jakarta.annotation.Nullable Integer attributeInteger) {
     this.attributeInteger = attributeInteger;
@@ -275,7 +275,7 @@ public XmlItem attributeBoolean(@jakarta.annotation.Nullable Boolean attributeBo
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getAttributeBoolean() {
@@ -283,7 +283,7 @@ public Boolean getAttributeBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeBoolean(@jakarta.annotation.Nullable Boolean attributeBoolean) {
     this.attributeBoolean = attributeBoolean;
@@ -309,7 +309,7 @@ public XmlItem addWrappedArrayItem(Integer wrappedArrayItem) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getWrappedArray() {
@@ -317,7 +317,7 @@ public List<Integer> getWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setWrappedArray(@jakarta.annotation.Nullable List<Integer> wrappedArray) {
     this.wrappedArray = wrappedArray;
@@ -335,7 +335,7 @@ public XmlItem nameString(@jakarta.annotation.Nullable String nameString) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNameString() {
@@ -343,7 +343,7 @@ public String getNameString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameString(@jakarta.annotation.Nullable String nameString) {
     this.nameString = nameString;
@@ -362,7 +362,7 @@ public XmlItem nameNumber(@jakarta.annotation.Nullable BigDecimal nameNumber) {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNameNumber() {
@@ -370,7 +370,7 @@ public BigDecimal getNameNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameNumber(@jakarta.annotation.Nullable BigDecimal nameNumber) {
     this.nameNumber = nameNumber;
@@ -388,7 +388,7 @@ public XmlItem nameInteger(@jakarta.annotation.Nullable Integer nameInteger) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNameInteger() {
@@ -396,7 +396,7 @@ public Integer getNameInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameInteger(@jakarta.annotation.Nullable Integer nameInteger) {
     this.nameInteger = nameInteger;
@@ -414,7 +414,7 @@ public XmlItem nameBoolean(@jakarta.annotation.Nullable Boolean nameBoolean) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getNameBoolean() {
@@ -422,7 +422,7 @@ public Boolean getNameBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameBoolean(@jakarta.annotation.Nullable Boolean nameBoolean) {
     this.nameBoolean = nameBoolean;
@@ -448,7 +448,7 @@ public XmlItem addNameArrayItem(Integer nameArrayItem) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameArray() {
@@ -456,7 +456,7 @@ public List<Integer> getNameArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameArray(@jakarta.annotation.Nullable List<Integer> nameArray) {
     this.nameArray = nameArray;
@@ -482,7 +482,7 @@ public XmlItem addNameWrappedArrayItem(Integer nameWrappedArrayItem) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameWrappedArray() {
@@ -490,7 +490,7 @@ public List<Integer> getNameWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameWrappedArray(@jakarta.annotation.Nullable List<Integer> nameWrappedArray) {
     this.nameWrappedArray = nameWrappedArray;
@@ -508,7 +508,7 @@ public XmlItem prefixString(@jakarta.annotation.Nullable String prefixString) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixString() {
@@ -516,7 +516,7 @@ public String getPrefixString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixString(@jakarta.annotation.Nullable String prefixString) {
     this.prefixString = prefixString;
@@ -535,7 +535,7 @@ public XmlItem prefixNumber(@jakarta.annotation.Nullable BigDecimal prefixNumber
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNumber() {
@@ -543,7 +543,7 @@ public BigDecimal getPrefixNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNumber(@jakarta.annotation.Nullable BigDecimal prefixNumber) {
     this.prefixNumber = prefixNumber;
@@ -561,7 +561,7 @@ public XmlItem prefixInteger(@jakarta.annotation.Nullable Integer prefixInteger)
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixInteger() {
@@ -569,7 +569,7 @@ public Integer getPrefixInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixInteger(@jakarta.annotation.Nullable Integer prefixInteger) {
     this.prefixInteger = prefixInteger;
@@ -587,7 +587,7 @@ public XmlItem prefixBoolean(@jakarta.annotation.Nullable Boolean prefixBoolean)
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getPrefixBoolean() {
@@ -595,7 +595,7 @@ public Boolean getPrefixBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixBoolean(@jakarta.annotation.Nullable Boolean prefixBoolean) {
     this.prefixBoolean = prefixBoolean;
@@ -621,7 +621,7 @@ public XmlItem addPrefixArrayItem(Integer prefixArrayItem) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixArray() {
@@ -629,7 +629,7 @@ public List<Integer> getPrefixArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixArray(@jakarta.annotation.Nullable List<Integer> prefixArray) {
     this.prefixArray = prefixArray;
@@ -655,7 +655,7 @@ public XmlItem addPrefixWrappedArrayItem(Integer prefixWrappedArrayItem) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixWrappedArray() {
@@ -663,7 +663,7 @@ public List<Integer> getPrefixWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixWrappedArray(@jakarta.annotation.Nullable List<Integer> prefixWrappedArray) {
     this.prefixWrappedArray = prefixWrappedArray;
@@ -681,7 +681,7 @@ public XmlItem namespaceString(@jakarta.annotation.Nullable String namespaceStri
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNamespaceString() {
@@ -689,7 +689,7 @@ public String getNamespaceString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceString(@jakarta.annotation.Nullable String namespaceString) {
     this.namespaceString = namespaceString;
@@ -708,7 +708,7 @@ public XmlItem namespaceNumber(@jakarta.annotation.Nullable BigDecimal namespace
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNamespaceNumber() {
@@ -716,7 +716,7 @@ public BigDecimal getNamespaceNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceNumber(@jakarta.annotation.Nullable BigDecimal namespaceNumber) {
     this.namespaceNumber = namespaceNumber;
@@ -734,7 +734,7 @@ public XmlItem namespaceInteger(@jakarta.annotation.Nullable Integer namespaceIn
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNamespaceInteger() {
@@ -742,7 +742,7 @@ public Integer getNamespaceInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceInteger(@jakarta.annotation.Nullable Integer namespaceInteger) {
     this.namespaceInteger = namespaceInteger;
@@ -760,7 +760,7 @@ public XmlItem namespaceBoolean(@jakarta.annotation.Nullable Boolean namespaceBo
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getNamespaceBoolean() {
@@ -768,7 +768,7 @@ public Boolean getNamespaceBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceBoolean(@jakarta.annotation.Nullable Boolean namespaceBoolean) {
     this.namespaceBoolean = namespaceBoolean;
@@ -794,7 +794,7 @@ public XmlItem addNamespaceArrayItem(Integer namespaceArrayItem) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceArray() {
@@ -802,7 +802,7 @@ public List<Integer> getNamespaceArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceArray(@jakarta.annotation.Nullable List<Integer> namespaceArray) {
     this.namespaceArray = namespaceArray;
@@ -828,7 +828,7 @@ public XmlItem addNamespaceWrappedArrayItem(Integer namespaceWrappedArrayItem) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceWrappedArray() {
@@ -836,7 +836,7 @@ public List<Integer> getNamespaceWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceWrappedArray(@jakarta.annotation.Nullable List<Integer> namespaceWrappedArray) {
     this.namespaceWrappedArray = namespaceWrappedArray;
@@ -854,7 +854,7 @@ public XmlItem prefixNsString(@jakarta.annotation.Nullable String prefixNsString
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixNsString() {
@@ -862,7 +862,7 @@ public String getPrefixNsString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsString(@jakarta.annotation.Nullable String prefixNsString) {
     this.prefixNsString = prefixNsString;
@@ -881,7 +881,7 @@ public XmlItem prefixNsNumber(@jakarta.annotation.Nullable BigDecimal prefixNsNu
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNsNumber() {
@@ -889,7 +889,7 @@ public BigDecimal getPrefixNsNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsNumber(@jakarta.annotation.Nullable BigDecimal prefixNsNumber) {
     this.prefixNsNumber = prefixNsNumber;
@@ -907,7 +907,7 @@ public XmlItem prefixNsInteger(@jakarta.annotation.Nullable Integer prefixNsInte
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixNsInteger() {
@@ -915,7 +915,7 @@ public Integer getPrefixNsInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsInteger(@jakarta.annotation.Nullable Integer prefixNsInteger) {
     this.prefixNsInteger = prefixNsInteger;
@@ -933,7 +933,7 @@ public XmlItem prefixNsBoolean(@jakarta.annotation.Nullable Boolean prefixNsBool
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getPrefixNsBoolean() {
@@ -941,7 +941,7 @@ public Boolean getPrefixNsBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsBoolean(@jakarta.annotation.Nullable Boolean prefixNsBoolean) {
     this.prefixNsBoolean = prefixNsBoolean;
@@ -967,7 +967,7 @@ public XmlItem addPrefixNsArrayItem(Integer prefixNsArrayItem) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsArray() {
@@ -975,7 +975,7 @@ public List<Integer> getPrefixNsArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsArray(@jakarta.annotation.Nullable List<Integer> prefixNsArray) {
     this.prefixNsArray = prefixNsArray;
@@ -1001,7 +1001,7 @@ public XmlItem addPrefixNsWrappedArrayItem(Integer prefixNsWrappedArrayItem) {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsWrappedArray() {
@@ -1009,7 +1009,7 @@ public List<Integer> getPrefixNsWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsWrappedArray(@jakarta.annotation.Nullable List<Integer> prefixNsWrappedArray) {
     this.prefixNsWrappedArray = prefixNsWrappedArray;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
index bee74a4c8118..89864f827112 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
@@ -52,7 +52,7 @@ public AdditionalPropertiesAnyType name(@javax.annotation.Nullable String name)
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
index 5aba7267a12a..dfd23375dc01 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
@@ -53,7 +53,7 @@ public AdditionalPropertiesArray name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -61,7 +61,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
index 8114cd21193f..506a41488de9 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
@@ -52,7 +52,7 @@ public AdditionalPropertiesBoolean name(@javax.annotation.Nullable String name)
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 581c2fbe1407..8044ecbab6ea 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -111,7 +111,7 @@ public AdditionalPropertiesClass putMapStringItem(String key, String mapStringIt
    * @return mapString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapString() {
@@ -119,7 +119,7 @@ public Map<String, String> getMapString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapString(@javax.annotation.Nullable Map<String, String> mapString) {
     this.mapString = mapString;
@@ -144,7 +144,7 @@ public AdditionalPropertiesClass putMapNumberItem(String key, BigDecimal mapNumb
    * @return mapNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getMapNumber() {
@@ -152,7 +152,7 @@ public Map<String, BigDecimal> getMapNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapNumber(@javax.annotation.Nullable Map<String, BigDecimal> mapNumber) {
     this.mapNumber = mapNumber;
@@ -177,7 +177,7 @@ public AdditionalPropertiesClass putMapIntegerItem(String key, Integer mapIntege
    * @return mapInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Integer> getMapInteger() {
@@ -185,7 +185,7 @@ public Map<String, Integer> getMapInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapInteger(@javax.annotation.Nullable Map<String, Integer> mapInteger) {
     this.mapInteger = mapInteger;
@@ -210,7 +210,7 @@ public AdditionalPropertiesClass putMapBooleanItem(String key, Boolean mapBoolea
    * @return mapBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getMapBoolean() {
@@ -218,7 +218,7 @@ public Map<String, Boolean> getMapBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapBoolean(@javax.annotation.Nullable Map<String, Boolean> mapBoolean) {
     this.mapBoolean = mapBoolean;
@@ -243,7 +243,7 @@ public AdditionalPropertiesClass putMapArrayIntegerItem(String key, List<Integer
    * @return mapArrayInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Integer>> getMapArrayInteger() {
@@ -251,7 +251,7 @@ public Map<String, List<Integer>> getMapArrayInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayInteger(@javax.annotation.Nullable Map<String, List<Integer>> mapArrayInteger) {
     this.mapArrayInteger = mapArrayInteger;
@@ -276,7 +276,7 @@ public AdditionalPropertiesClass putMapArrayAnytypeItem(String key, List<Object>
    * @return mapArrayAnytype
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Object>> getMapArrayAnytype() {
@@ -284,7 +284,7 @@ public Map<String, List<Object>> getMapArrayAnytype() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayAnytype(@javax.annotation.Nullable Map<String, List<Object>> mapArrayAnytype) {
     this.mapArrayAnytype = mapArrayAnytype;
@@ -309,7 +309,7 @@ public AdditionalPropertiesClass putMapMapStringItem(String key, Map<String, Str
    * @return mapMapString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapString() {
@@ -317,7 +317,7 @@ public Map<String, Map<String, String>> getMapMapString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapString) {
     this.mapMapString = mapMapString;
@@ -342,7 +342,7 @@ public AdditionalPropertiesClass putMapMapAnytypeItem(String key, Map<String, Ob
    * @return mapMapAnytype
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, Object>> getMapMapAnytype() {
@@ -350,7 +350,7 @@ public Map<String, Map<String, Object>> getMapMapAnytype() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapAnytype(@javax.annotation.Nullable Map<String, Map<String, Object>> mapMapAnytype) {
     this.mapMapAnytype = mapMapAnytype;
@@ -367,7 +367,7 @@ public AdditionalPropertiesClass anytype1(@javax.annotation.Nullable Object anyt
    * @return anytype1
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype1() {
@@ -375,7 +375,7 @@ public Object getAnytype1() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype1(@javax.annotation.Nullable Object anytype1) {
     this.anytype1 = anytype1;
@@ -392,7 +392,7 @@ public AdditionalPropertiesClass anytype2(@javax.annotation.Nullable Object anyt
    * @return anytype2
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype2() {
@@ -400,7 +400,7 @@ public Object getAnytype2() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype2(@javax.annotation.Nullable Object anytype2) {
     this.anytype2 = anytype2;
@@ -417,7 +417,7 @@ public AdditionalPropertiesClass anytype3(@javax.annotation.Nullable Object anyt
    * @return anytype3
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype3() {
@@ -425,7 +425,7 @@ public Object getAnytype3() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype3(@javax.annotation.Nullable Object anytype3) {
     this.anytype3 = anytype3;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
index cd225fac1575..613f96692a46 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
@@ -52,7 +52,7 @@ public AdditionalPropertiesInteger name(@javax.annotation.Nullable String name)
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
index 5ef408e04c4c..0c00ee724427 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
@@ -53,7 +53,7 @@ public AdditionalPropertiesNumber name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -61,7 +61,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
index 3a313e40fe2b..524112e88a91 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
@@ -52,7 +52,7 @@ public AdditionalPropertiesObject name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
index 4a834585bfe1..7b418b7c87e8 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
@@ -52,7 +52,7 @@ public AdditionalPropertiesString name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Animal.java
index e88053cfbca1..eaa5c323d7fe 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Animal.java
@@ -68,7 +68,7 @@ public Animal className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -76,7 +76,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -93,7 +93,7 @@ public Animal color(@javax.annotation.Nullable String color) {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -101,7 +101,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 9f9230f5c51b..e48bf84ca4cc 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -61,7 +61,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -69,7 +69,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 95eb35a262ca..01c9badd8ece 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -61,7 +61,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -69,7 +69,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayTest.java
index 6e87eafcc512..006c8ce93a21 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -71,7 +71,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -79,7 +79,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -104,7 +104,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -112,7 +112,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -137,7 +137,7 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -145,7 +145,7 @@ public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/BigCat.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/BigCat.java
index d72c2a445010..cdf37400e42c 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/BigCat.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/BigCat.java
@@ -99,7 +99,7 @@ public BigCat kind(@javax.annotation.Nullable KindEnum kind) {
    * @return kind
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public KindEnum getKind() {
@@ -107,7 +107,7 @@ public KindEnum getKind() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setKind(@javax.annotation.Nullable KindEnum kind) {
     this.kind = kind;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Capitalization.java
index dec70966d099..dd08bed9aebb 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -74,7 +74,7 @@ public Capitalization smallCamel(@javax.annotation.Nullable String smallCamel) {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -82,7 +82,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -99,7 +99,7 @@ public Capitalization capitalCamel(@javax.annotation.Nullable String capitalCame
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -107,7 +107,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -124,7 +124,7 @@ public Capitalization smallSnake(@javax.annotation.Nullable String smallSnake) {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -132,7 +132,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -149,7 +149,7 @@ public Capitalization capitalSnake(@javax.annotation.Nullable String capitalSnak
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -157,7 +157,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -174,7 +174,7 @@ public Capitalization scAETHFlowPoints(@javax.annotation.Nullable String scAETHF
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -182,7 +182,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -199,7 +199,7 @@ public Capitalization ATT_NAME(@javax.annotation.Nullable String ATT_NAME) {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -207,7 +207,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Cat.java
index 66109a131e1a..ff3c8f5bc560 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Cat.java
@@ -63,7 +63,7 @@ public Cat declawed(@javax.annotation.Nullable Boolean declawed) {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -71,7 +71,7 @@ public Boolean getDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Category.java
index d1fc7b09c499..9e1b7316bbfa 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Category.java
@@ -54,7 +54,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Category name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ClassModel.java
index 675e9f398283..e8d8b419f6ab 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -49,7 +49,7 @@ public ClassModel propertyClass(@javax.annotation.Nullable String propertyClass)
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -57,7 +57,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Client.java
index 434d46ad1b64..2d1ad6833b70 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Client.java
@@ -49,7 +49,7 @@ public Client client(@javax.annotation.Nullable String client) {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -57,7 +57,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Dog.java
index b62b147f96e1..8787d050632b 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Dog.java
@@ -60,7 +60,7 @@ public Dog breed(@javax.annotation.Nullable String breed) {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -68,7 +68,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/EnumArrays.java
index 96da52dd6a11..2d9895cc3874 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -127,7 +127,7 @@ public EnumArrays justSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbo
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -135,7 +135,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -160,7 +160,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -168,7 +168,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/EnumTest.java
index f9183223c201..591077e5a260 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -215,7 +215,7 @@ public EnumTest enumString(@javax.annotation.Nullable EnumStringEnum enumString)
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -223,7 +223,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -240,7 +240,7 @@ public EnumTest enumStringRequired(@javax.annotation.Nonnull EnumStringRequiredE
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -248,7 +248,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -265,7 +265,7 @@ public EnumTest enumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteg
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -273,7 +273,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -290,7 +290,7 @@ public EnumTest enumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber)
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -298,7 +298,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -315,7 +315,7 @@ public EnumTest outerEnum(@javax.annotation.Nullable OuterEnum outerEnum) {
    * @return outerEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnum getOuterEnum() {
@@ -323,7 +323,7 @@ public OuterEnum getOuterEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnum(@javax.annotation.Nullable OuterEnum outerEnum) {
     this.outerEnum = outerEnum;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 3231a00ed0f3..39bb17b9ea7b 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -58,7 +58,7 @@ public FileSchemaTestClass _file(@javax.annotation.Nullable ModelFile _file) {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -66,7 +66,7 @@ public ModelFile getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -91,7 +91,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -99,7 +99,7 @@ public List<ModelFile> getFiles() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/FormatTest.java
index 9bcb85530170..25d42b7f1c3f 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -122,7 +122,7 @@ public FormatTest integer(@javax.annotation.Nullable Integer integer) {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -130,7 +130,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -149,7 +149,7 @@ public FormatTest int32(@javax.annotation.Nullable Integer int32) {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -157,7 +157,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -174,7 +174,7 @@ public FormatTest int64(@javax.annotation.Nullable Long int64) {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -182,7 +182,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -201,7 +201,7 @@ public FormatTest number(@javax.annotation.Nonnull BigDecimal number) {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -209,7 +209,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -228,7 +228,7 @@ public FormatTest _float(@javax.annotation.Nullable Float _float) {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -236,7 +236,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -255,7 +255,7 @@ public FormatTest _double(@javax.annotation.Nullable Double _double) {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -263,7 +263,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -280,7 +280,7 @@ public FormatTest string(@javax.annotation.Nullable String string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -288,7 +288,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -305,7 +305,7 @@ public FormatTest _byte(@javax.annotation.Nonnull byte[] _byte) {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -313,7 +313,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -330,7 +330,7 @@ public FormatTest binary(@javax.annotation.Nullable AsyncFile binary) {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public AsyncFile getBinary() {
@@ -338,7 +338,7 @@ public AsyncFile getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable AsyncFile binary) {
     this.binary = binary;
@@ -355,7 +355,7 @@ public FormatTest date(@javax.annotation.Nonnull LocalDate date) {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -363,7 +363,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -380,7 +380,7 @@ public FormatTest dateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -388,7 +388,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -405,7 +405,7 @@ public FormatTest uuid(@javax.annotation.Nullable UUID uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -413,7 +413,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -430,7 +430,7 @@ public FormatTest password(@javax.annotation.Nonnull String password) {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -438,7 +438,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -455,7 +455,7 @@ public FormatTest bigDecimal(@javax.annotation.Nullable BigDecimal bigDecimal) {
    * @return bigDecimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getBigDecimal() {
@@ -463,7 +463,7 @@ public BigDecimal getBigDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBigDecimal(@javax.annotation.Nullable BigDecimal bigDecimal) {
     this.bigDecimal = bigDecimal;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index fab16c721c1c..75462506e6c8 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -48,8 +48,8 @@ public HasOnlyReadOnly() {
    */
   @JsonCreator
   public HasOnlyReadOnly(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar, 
-    @JsonProperty(JSON_PROPERTY_FOO) String foo
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar, 
+    @JsonProperty(value = JSON_PROPERTY_FOO, required = false) String foo
   ) {
     this();
     this.bar = bar;
@@ -61,7 +61,7 @@ public HasOnlyReadOnly(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -75,7 +75,7 @@ public String getBar() {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/MapTest.java
index 226af5128b2b..94020730a719 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/MapTest.java
@@ -109,7 +109,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -117,7 +117,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -142,7 +142,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -150,7 +150,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -175,7 +175,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -183,7 +183,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -208,7 +208,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -216,7 +216,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index be9066f8a227..c515e1506f66 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -64,7 +64,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@javax.annotation.Nullab
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -72,7 +72,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -89,7 +89,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@javax.annotation.Nu
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -97,7 +97,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -122,7 +122,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -130,7 +130,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Model200Response.java
index f445295ef573..cc0125122612 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -55,7 +55,7 @@ public Model200Response name(@javax.annotation.Nullable Integer name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -63,7 +63,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -80,7 +80,7 @@ public Model200Response propertyClass(@javax.annotation.Nullable String property
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -88,7 +88,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 9fce2e1e3bab..4b9ecc77489a 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -60,7 +60,7 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -68,7 +68,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -85,7 +85,7 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -93,7 +93,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -110,7 +110,7 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -118,7 +118,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelFile.java
index b56cda290634..aafab80e041d 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -50,7 +50,7 @@ public ModelFile sourceURI(@javax.annotation.Nullable String sourceURI) {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -58,7 +58,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelList.java
index d0f770be3bdb..2ac93e97b4c5 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelList.java
@@ -50,7 +50,7 @@ public ModelList _123list(@javax.annotation.Nullable String _123list) {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -58,7 +58,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelReturn.java
index a5e4c8656d48..2e06a4c7a467 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -50,7 +50,7 @@ public ModelReturn _return(@javax.annotation.Nullable Integer _return) {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -58,7 +58,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Name.java
index 7c79599ff5d8..ead2b3b3e5f1 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Name.java
@@ -57,8 +57,8 @@ public Name() {
    */
   @JsonCreator
   public Name(
-    @JsonProperty(JSON_PROPERTY_SNAKE_CASE) Integer snakeCase, 
-    @JsonProperty(JSON_PROPERTY_123NUMBER) Integer _123number
+    @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false) Integer snakeCase, 
+    @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false) Integer _123number
   ) {
     this();
     this.snakeCase = snakeCase;
@@ -76,7 +76,7 @@ public Name name(@javax.annotation.Nonnull Integer name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -84,7 +84,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -95,7 +95,7 @@ public void setName(@javax.annotation.Nonnull Integer name) {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -115,7 +115,7 @@ public Name property(@javax.annotation.Nullable String property) {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -123,7 +123,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -134,7 +134,7 @@ public void setProperty(@javax.annotation.Nullable String property) {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/NumberOnly.java
index 2b2688a79089..264e825134f1 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -50,7 +50,7 @@ public NumberOnly justNumber(@javax.annotation.Nullable BigDecimal justNumber) {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -58,7 +58,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Order.java
index 19a6f2e22dd1..075006c47dc6 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Order.java
@@ -112,7 +112,7 @@ public Order id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -120,7 +120,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -137,7 +137,7 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -145,7 +145,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -162,7 +162,7 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -170,7 +170,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -187,7 +187,7 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -195,7 +195,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -212,7 +212,7 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -220,7 +220,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -237,7 +237,7 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -245,7 +245,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/OuterComposite.java
index 7b928ac82f35..14b334e4829a 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -60,7 +60,7 @@ public OuterComposite myNumber(@javax.annotation.Nullable BigDecimal myNumber) {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -68,7 +68,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -85,7 +85,7 @@ public OuterComposite myString(@javax.annotation.Nullable String myString) {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -93,7 +93,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -110,7 +110,7 @@ public OuterComposite myBoolean(@javax.annotation.Nullable Boolean myBoolean) {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -118,7 +118,7 @@ public Boolean getMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Pet.java
index 9c64c19a7c2c..6642f3237661 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Pet.java
@@ -119,7 +119,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -127,7 +127,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -144,7 +144,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -152,7 +152,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -169,7 +169,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -177,7 +177,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -202,7 +202,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -211,7 +211,7 @@ public Set<String> getPhotoUrls() {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -236,7 +236,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -244,7 +244,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -261,7 +261,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -269,7 +269,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 784d47d6a106..eeffca460496 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -47,7 +47,7 @@ public ReadOnlyFirst() {
    */
   @JsonCreator
   public ReadOnlyFirst(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar
   ) {
     this();
     this.bar = bar;
@@ -58,7 +58,7 @@ public ReadOnlyFirst(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -78,7 +78,7 @@ public ReadOnlyFirst baz(@javax.annotation.Nullable String baz) {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -86,7 +86,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 62f2544da2d3..4d2bf7518e90 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -50,7 +50,7 @@ public SpecialModelName() {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -58,7 +58,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Tag.java
index fc2ee7bfc564..83ece7141a46 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Tag.java
@@ -54,7 +54,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderDefault.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
index 59435e41e0bd..c34d335d9a53 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
@@ -73,7 +73,7 @@ public TypeHolderDefault stringItem(@javax.annotation.Nonnull String stringItem)
    * @return stringItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -81,7 +81,7 @@ public String getStringItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -98,7 +98,7 @@ public TypeHolderDefault numberItem(@javax.annotation.Nonnull BigDecimal numberI
    * @return numberItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -106,7 +106,7 @@ public BigDecimal getNumberItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -123,7 +123,7 @@ public TypeHolderDefault integerItem(@javax.annotation.Nonnull Integer integerIt
    * @return integerItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -131,7 +131,7 @@ public Integer getIntegerItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -148,7 +148,7 @@ public TypeHolderDefault boolItem(@javax.annotation.Nonnull Boolean boolItem) {
    * @return boolItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean getBoolItem() {
@@ -156,7 +156,7 @@ public Boolean getBoolItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -181,7 +181,7 @@ public TypeHolderDefault addArrayItemItem(Integer arrayItemItem) {
    * @return arrayItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -189,7 +189,7 @@ public List<Integer> getArrayItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderExample.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderExample.java
index 952e5a73f2ef..c170ffebe32b 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderExample.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderExample.java
@@ -78,7 +78,7 @@ public TypeHolderExample stringItem(@javax.annotation.Nonnull String stringItem)
    * @return stringItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -86,7 +86,7 @@ public String getStringItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -103,7 +103,7 @@ public TypeHolderExample numberItem(@javax.annotation.Nonnull BigDecimal numberI
    * @return numberItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -111,7 +111,7 @@ public BigDecimal getNumberItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -128,7 +128,7 @@ public TypeHolderExample floatItem(@javax.annotation.Nonnull Float floatItem) {
    * @return floatItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Float getFloatItem() {
@@ -136,7 +136,7 @@ public Float getFloatItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setFloatItem(@javax.annotation.Nonnull Float floatItem) {
     this.floatItem = floatItem;
@@ -153,7 +153,7 @@ public TypeHolderExample integerItem(@javax.annotation.Nonnull Integer integerIt
    * @return integerItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -161,7 +161,7 @@ public Integer getIntegerItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -178,7 +178,7 @@ public TypeHolderExample boolItem(@javax.annotation.Nonnull Boolean boolItem) {
    * @return boolItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean getBoolItem() {
@@ -186,7 +186,7 @@ public Boolean getBoolItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -211,7 +211,7 @@ public TypeHolderExample addArrayItemItem(Integer arrayItemItem) {
    * @return arrayItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -219,7 +219,7 @@ public List<Integer> getArrayItem() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/User.java
index 4aa0d35c2889..7a457acb78ba 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/User.java
@@ -84,7 +84,7 @@ public User id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -92,7 +92,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -109,7 +109,7 @@ public User username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -117,7 +117,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -134,7 +134,7 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -142,7 +142,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -159,7 +159,7 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -167,7 +167,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -184,7 +184,7 @@ public User email(@javax.annotation.Nullable String email) {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -192,7 +192,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -209,7 +209,7 @@ public User password(@javax.annotation.Nullable String password) {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -217,7 +217,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -234,7 +234,7 @@ public User phone(@javax.annotation.Nullable String phone) {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -242,7 +242,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -259,7 +259,7 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -267,7 +267,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/XmlItem.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/XmlItem.java
index af00bcc3538b..cdb509cf8e06 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/XmlItem.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/XmlItem.java
@@ -193,7 +193,7 @@ public XmlItem attributeString(@javax.annotation.Nullable String attributeString
    * @return attributeString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAttributeString() {
@@ -201,7 +201,7 @@ public String getAttributeString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeString(@javax.annotation.Nullable String attributeString) {
     this.attributeString = attributeString;
@@ -218,7 +218,7 @@ public XmlItem attributeNumber(@javax.annotation.Nullable BigDecimal attributeNu
    * @return attributeNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getAttributeNumber() {
@@ -226,7 +226,7 @@ public BigDecimal getAttributeNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeNumber(@javax.annotation.Nullable BigDecimal attributeNumber) {
     this.attributeNumber = attributeNumber;
@@ -243,7 +243,7 @@ public XmlItem attributeInteger(@javax.annotation.Nullable Integer attributeInte
    * @return attributeInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getAttributeInteger() {
@@ -251,7 +251,7 @@ public Integer getAttributeInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeInteger(@javax.annotation.Nullable Integer attributeInteger) {
     this.attributeInteger = attributeInteger;
@@ -268,7 +268,7 @@ public XmlItem attributeBoolean(@javax.annotation.Nullable Boolean attributeBool
    * @return attributeBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getAttributeBoolean() {
@@ -276,7 +276,7 @@ public Boolean getAttributeBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeBoolean(@javax.annotation.Nullable Boolean attributeBoolean) {
     this.attributeBoolean = attributeBoolean;
@@ -301,7 +301,7 @@ public XmlItem addWrappedArrayItem(Integer wrappedArrayItem) {
    * @return wrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getWrappedArray() {
@@ -309,7 +309,7 @@ public List<Integer> getWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setWrappedArray(@javax.annotation.Nullable List<Integer> wrappedArray) {
     this.wrappedArray = wrappedArray;
@@ -326,7 +326,7 @@ public XmlItem nameString(@javax.annotation.Nullable String nameString) {
    * @return nameString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNameString() {
@@ -334,7 +334,7 @@ public String getNameString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameString(@javax.annotation.Nullable String nameString) {
     this.nameString = nameString;
@@ -351,7 +351,7 @@ public XmlItem nameNumber(@javax.annotation.Nullable BigDecimal nameNumber) {
    * @return nameNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNameNumber() {
@@ -359,7 +359,7 @@ public BigDecimal getNameNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameNumber(@javax.annotation.Nullable BigDecimal nameNumber) {
     this.nameNumber = nameNumber;
@@ -376,7 +376,7 @@ public XmlItem nameInteger(@javax.annotation.Nullable Integer nameInteger) {
    * @return nameInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNameInteger() {
@@ -384,7 +384,7 @@ public Integer getNameInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameInteger(@javax.annotation.Nullable Integer nameInteger) {
     this.nameInteger = nameInteger;
@@ -401,7 +401,7 @@ public XmlItem nameBoolean(@javax.annotation.Nullable Boolean nameBoolean) {
    * @return nameBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getNameBoolean() {
@@ -409,7 +409,7 @@ public Boolean getNameBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameBoolean(@javax.annotation.Nullable Boolean nameBoolean) {
     this.nameBoolean = nameBoolean;
@@ -434,7 +434,7 @@ public XmlItem addNameArrayItem(Integer nameArrayItem) {
    * @return nameArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameArray() {
@@ -442,7 +442,7 @@ public List<Integer> getNameArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameArray(@javax.annotation.Nullable List<Integer> nameArray) {
     this.nameArray = nameArray;
@@ -467,7 +467,7 @@ public XmlItem addNameWrappedArrayItem(Integer nameWrappedArrayItem) {
    * @return nameWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameWrappedArray() {
@@ -475,7 +475,7 @@ public List<Integer> getNameWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameWrappedArray(@javax.annotation.Nullable List<Integer> nameWrappedArray) {
     this.nameWrappedArray = nameWrappedArray;
@@ -492,7 +492,7 @@ public XmlItem prefixString(@javax.annotation.Nullable String prefixString) {
    * @return prefixString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixString() {
@@ -500,7 +500,7 @@ public String getPrefixString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixString(@javax.annotation.Nullable String prefixString) {
     this.prefixString = prefixString;
@@ -517,7 +517,7 @@ public XmlItem prefixNumber(@javax.annotation.Nullable BigDecimal prefixNumber)
    * @return prefixNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNumber() {
@@ -525,7 +525,7 @@ public BigDecimal getPrefixNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNumber(@javax.annotation.Nullable BigDecimal prefixNumber) {
     this.prefixNumber = prefixNumber;
@@ -542,7 +542,7 @@ public XmlItem prefixInteger(@javax.annotation.Nullable Integer prefixInteger) {
    * @return prefixInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixInteger() {
@@ -550,7 +550,7 @@ public Integer getPrefixInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixInteger(@javax.annotation.Nullable Integer prefixInteger) {
     this.prefixInteger = prefixInteger;
@@ -567,7 +567,7 @@ public XmlItem prefixBoolean(@javax.annotation.Nullable Boolean prefixBoolean) {
    * @return prefixBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getPrefixBoolean() {
@@ -575,7 +575,7 @@ public Boolean getPrefixBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixBoolean(@javax.annotation.Nullable Boolean prefixBoolean) {
     this.prefixBoolean = prefixBoolean;
@@ -600,7 +600,7 @@ public XmlItem addPrefixArrayItem(Integer prefixArrayItem) {
    * @return prefixArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixArray() {
@@ -608,7 +608,7 @@ public List<Integer> getPrefixArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixArray(@javax.annotation.Nullable List<Integer> prefixArray) {
     this.prefixArray = prefixArray;
@@ -633,7 +633,7 @@ public XmlItem addPrefixWrappedArrayItem(Integer prefixWrappedArrayItem) {
    * @return prefixWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixWrappedArray() {
@@ -641,7 +641,7 @@ public List<Integer> getPrefixWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixWrappedArray(@javax.annotation.Nullable List<Integer> prefixWrappedArray) {
     this.prefixWrappedArray = prefixWrappedArray;
@@ -658,7 +658,7 @@ public XmlItem namespaceString(@javax.annotation.Nullable String namespaceString
    * @return namespaceString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNamespaceString() {
@@ -666,7 +666,7 @@ public String getNamespaceString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceString(@javax.annotation.Nullable String namespaceString) {
     this.namespaceString = namespaceString;
@@ -683,7 +683,7 @@ public XmlItem namespaceNumber(@javax.annotation.Nullable BigDecimal namespaceNu
    * @return namespaceNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNamespaceNumber() {
@@ -691,7 +691,7 @@ public BigDecimal getNamespaceNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceNumber(@javax.annotation.Nullable BigDecimal namespaceNumber) {
     this.namespaceNumber = namespaceNumber;
@@ -708,7 +708,7 @@ public XmlItem namespaceInteger(@javax.annotation.Nullable Integer namespaceInte
    * @return namespaceInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNamespaceInteger() {
@@ -716,7 +716,7 @@ public Integer getNamespaceInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceInteger(@javax.annotation.Nullable Integer namespaceInteger) {
     this.namespaceInteger = namespaceInteger;
@@ -733,7 +733,7 @@ public XmlItem namespaceBoolean(@javax.annotation.Nullable Boolean namespaceBool
    * @return namespaceBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getNamespaceBoolean() {
@@ -741,7 +741,7 @@ public Boolean getNamespaceBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceBoolean(@javax.annotation.Nullable Boolean namespaceBoolean) {
     this.namespaceBoolean = namespaceBoolean;
@@ -766,7 +766,7 @@ public XmlItem addNamespaceArrayItem(Integer namespaceArrayItem) {
    * @return namespaceArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceArray() {
@@ -774,7 +774,7 @@ public List<Integer> getNamespaceArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceArray(@javax.annotation.Nullable List<Integer> namespaceArray) {
     this.namespaceArray = namespaceArray;
@@ -799,7 +799,7 @@ public XmlItem addNamespaceWrappedArrayItem(Integer namespaceWrappedArrayItem) {
    * @return namespaceWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceWrappedArray() {
@@ -807,7 +807,7 @@ public List<Integer> getNamespaceWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceWrappedArray(@javax.annotation.Nullable List<Integer> namespaceWrappedArray) {
     this.namespaceWrappedArray = namespaceWrappedArray;
@@ -824,7 +824,7 @@ public XmlItem prefixNsString(@javax.annotation.Nullable String prefixNsString)
    * @return prefixNsString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixNsString() {
@@ -832,7 +832,7 @@ public String getPrefixNsString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsString(@javax.annotation.Nullable String prefixNsString) {
     this.prefixNsString = prefixNsString;
@@ -849,7 +849,7 @@ public XmlItem prefixNsNumber(@javax.annotation.Nullable BigDecimal prefixNsNumb
    * @return prefixNsNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNsNumber() {
@@ -857,7 +857,7 @@ public BigDecimal getPrefixNsNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsNumber(@javax.annotation.Nullable BigDecimal prefixNsNumber) {
     this.prefixNsNumber = prefixNsNumber;
@@ -874,7 +874,7 @@ public XmlItem prefixNsInteger(@javax.annotation.Nullable Integer prefixNsIntege
    * @return prefixNsInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixNsInteger() {
@@ -882,7 +882,7 @@ public Integer getPrefixNsInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsInteger(@javax.annotation.Nullable Integer prefixNsInteger) {
     this.prefixNsInteger = prefixNsInteger;
@@ -899,7 +899,7 @@ public XmlItem prefixNsBoolean(@javax.annotation.Nullable Boolean prefixNsBoolea
    * @return prefixNsBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getPrefixNsBoolean() {
@@ -907,7 +907,7 @@ public Boolean getPrefixNsBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsBoolean(@javax.annotation.Nullable Boolean prefixNsBoolean) {
     this.prefixNsBoolean = prefixNsBoolean;
@@ -932,7 +932,7 @@ public XmlItem addPrefixNsArrayItem(Integer prefixNsArrayItem) {
    * @return prefixNsArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsArray() {
@@ -940,7 +940,7 @@ public List<Integer> getPrefixNsArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsArray(@javax.annotation.Nullable List<Integer> prefixNsArray) {
     this.prefixNsArray = prefixNsArray;
@@ -965,7 +965,7 @@ public XmlItem addPrefixNsWrappedArrayItem(Integer prefixNsWrappedArrayItem) {
    * @return prefixNsWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsWrappedArray() {
@@ -973,7 +973,7 @@ public List<Integer> getPrefixNsWrappedArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsWrappedArray(@javax.annotation.Nullable List<Integer> prefixNsWrappedArray) {
     this.prefixNsWrappedArray = prefixNsWrappedArray;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 01e6dd38c2e2..773fc1ab4e61 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -64,7 +64,7 @@ public AdditionalPropertiesClass putMapPropertyItem(String key, String mapProper
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -72,7 +72,7 @@ public Map<String, String> getMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -97,7 +97,7 @@ public AdditionalPropertiesClass putMapOfMapPropertyItem(String key, Map<String,
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -105,7 +105,7 @@ public Map<String, Map<String, String>> getMapOfMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 4369abfbfa8c..44f5d5faa6c1 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -55,7 +55,7 @@ public AllOfWithSingleRef username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -63,7 +63,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -80,7 +80,7 @@ public AllOfWithSingleRef singleRefType(@javax.annotation.Nullable SingleRefType
    * @return singleRefType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -88,7 +88,7 @@ public SingleRefType getSingleRefType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@javax.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Animal.java
index 76d809224eb5..2456fc0ac448 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Animal.java
@@ -67,7 +67,7 @@ public Animal className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -75,7 +75,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -92,7 +92,7 @@ public Animal color(@javax.annotation.Nullable String color) {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -100,7 +100,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 9f9230f5c51b..e48bf84ca4cc 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -61,7 +61,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -69,7 +69,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 95eb35a262ca..01c9badd8ece 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -61,7 +61,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -69,7 +69,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayTest.java
index 6e87eafcc512..006c8ce93a21 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -71,7 +71,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -79,7 +79,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -104,7 +104,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -112,7 +112,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -137,7 +137,7 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -145,7 +145,7 @@ public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Capitalization.java
index dec70966d099..dd08bed9aebb 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -74,7 +74,7 @@ public Capitalization smallCamel(@javax.annotation.Nullable String smallCamel) {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -82,7 +82,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -99,7 +99,7 @@ public Capitalization capitalCamel(@javax.annotation.Nullable String capitalCame
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -107,7 +107,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -124,7 +124,7 @@ public Capitalization smallSnake(@javax.annotation.Nullable String smallSnake) {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -132,7 +132,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -149,7 +149,7 @@ public Capitalization capitalSnake(@javax.annotation.Nullable String capitalSnak
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -157,7 +157,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -174,7 +174,7 @@ public Capitalization scAETHFlowPoints(@javax.annotation.Nullable String scAETHF
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -182,7 +182,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -199,7 +199,7 @@ public Capitalization ATT_NAME(@javax.annotation.Nullable String ATT_NAME) {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -207,7 +207,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Cat.java
index 53bed2e41f6b..3debe07d238a 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Cat.java
@@ -60,7 +60,7 @@ public Cat declawed(@javax.annotation.Nullable Boolean declawed) {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -68,7 +68,7 @@ public Boolean getDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Category.java
index d1fc7b09c499..9e1b7316bbfa 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Category.java
@@ -54,7 +54,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Category name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index 557f2f88af9a..5eed020a1cf3 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -61,7 +61,7 @@ public ChildWithNullable otherProperty(@javax.annotation.Nullable String otherPr
    * @return otherProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -69,7 +69,7 @@ public String getOtherProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@javax.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ClassModel.java
index 675e9f398283..e8d8b419f6ab 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -49,7 +49,7 @@ public ClassModel propertyClass(@javax.annotation.Nullable String propertyClass)
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -57,7 +57,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Client.java
index 434d46ad1b64..2d1ad6833b70 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Client.java
@@ -49,7 +49,7 @@ public Client client(@javax.annotation.Nullable String client) {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -57,7 +57,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index fee5fff083d4..478fce069d5a 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -51,7 +51,7 @@ public DeprecatedObject name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -59,7 +59,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Dog.java
index b62b147f96e1..8787d050632b 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Dog.java
@@ -60,7 +60,7 @@ public Dog breed(@javax.annotation.Nullable String breed) {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -68,7 +68,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/EnumArrays.java
index 96da52dd6a11..2d9895cc3874 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -127,7 +127,7 @@ public EnumArrays justSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbo
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -135,7 +135,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -160,7 +160,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -168,7 +168,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/EnumTest.java
index 69c3f59d7f9b..9373c81107df 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -237,7 +237,7 @@ public EnumTest enumString(@javax.annotation.Nullable EnumStringEnum enumString)
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -245,7 +245,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -262,7 +262,7 @@ public EnumTest enumStringRequired(@javax.annotation.Nonnull EnumStringRequiredE
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -270,7 +270,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -287,7 +287,7 @@ public EnumTest enumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteg
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -295,7 +295,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -312,7 +312,7 @@ public EnumTest enumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber)
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -320,7 +320,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -343,14 +343,14 @@ public OuterEnum getOuterEnum() {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
     return outerEnum;
   }
   
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   public void setOuterEnum_JsonNullable(JsonNullable<OuterEnum> outerEnum) {
     this.outerEnum = outerEnum;
   }
@@ -370,7 +370,7 @@ public EnumTest outerEnumInteger(@javax.annotation.Nullable OuterEnumInteger out
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -378,7 +378,7 @@ public OuterEnumInteger getOuterEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -395,7 +395,7 @@ public EnumTest outerEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaul
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -403,7 +403,7 @@ public OuterEnumDefaultValue getOuterEnumDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -420,7 +420,7 @@ public EnumTest outerEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnu
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -428,7 +428,7 @@ public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 7eca4111f558..c846c711391a 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -58,7 +58,7 @@ public FakeBigDecimalMap200Response someId(@javax.annotation.Nullable BigDecimal
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -66,7 +66,7 @@ public BigDecimal getSomeId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -91,7 +91,7 @@ public FakeBigDecimalMap200Response putSomeMapItem(String key, BigDecimal someMa
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -99,7 +99,7 @@ public Map<String, BigDecimal> getSomeMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 3231a00ed0f3..39bb17b9ea7b 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -58,7 +58,7 @@ public FileSchemaTestClass _file(@javax.annotation.Nullable ModelFile _file) {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -66,7 +66,7 @@ public ModelFile getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -91,7 +91,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -99,7 +99,7 @@ public List<ModelFile> getFiles() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Foo.java
index 161a8e206d43..d06e5dfe98a7 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Foo.java
@@ -49,7 +49,7 @@ public Foo bar(@javax.annotation.Nullable String bar) {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -57,7 +57,7 @@ public String getBar() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index fb1067ffcb00..c0fcd22a6969 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -51,7 +51,7 @@ public FooGetDefaultResponse string(@javax.annotation.Nullable Foo string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -59,7 +59,7 @@ public Foo getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FormatTest.java
index 22fbd79aa7d6..a4f69066e009 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -132,7 +132,7 @@ public FormatTest integer(@javax.annotation.Nullable Integer integer) {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -140,7 +140,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -159,7 +159,7 @@ public FormatTest int32(@javax.annotation.Nullable Integer int32) {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -167,7 +167,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -184,7 +184,7 @@ public FormatTest int64(@javax.annotation.Nullable Long int64) {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -192,7 +192,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -211,7 +211,7 @@ public FormatTest number(@javax.annotation.Nonnull BigDecimal number) {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -219,7 +219,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -238,7 +238,7 @@ public FormatTest _float(@javax.annotation.Nullable Float _float) {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -246,7 +246,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -265,7 +265,7 @@ public FormatTest _double(@javax.annotation.Nullable Double _double) {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -273,7 +273,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -290,7 +290,7 @@ public FormatTest decimal(@javax.annotation.Nullable BigDecimal decimal) {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -298,7 +298,7 @@ public BigDecimal getDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -315,7 +315,7 @@ public FormatTest string(@javax.annotation.Nullable String string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -323,7 +323,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -340,7 +340,7 @@ public FormatTest _byte(@javax.annotation.Nonnull byte[] _byte) {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -348,7 +348,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -365,7 +365,7 @@ public FormatTest binary(@javax.annotation.Nullable AsyncFile binary) {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public AsyncFile getBinary() {
@@ -373,7 +373,7 @@ public AsyncFile getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable AsyncFile binary) {
     this.binary = binary;
@@ -390,7 +390,7 @@ public FormatTest date(@javax.annotation.Nonnull LocalDate date) {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -398,7 +398,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -415,7 +415,7 @@ public FormatTest dateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -423,7 +423,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -440,7 +440,7 @@ public FormatTest uuid(@javax.annotation.Nullable UUID uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -448,7 +448,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -465,7 +465,7 @@ public FormatTest password(@javax.annotation.Nonnull String password) {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -473,7 +473,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -490,7 +490,7 @@ public FormatTest patternWithDigits(@javax.annotation.Nullable String patternWit
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -498,7 +498,7 @@ public String getPatternWithDigits() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -515,7 +515,7 @@ public FormatTest patternWithDigitsAndDelimiter(@javax.annotation.Nullable Strin
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -523,7 +523,7 @@ public String getPatternWithDigitsAndDelimiter() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index fab16c721c1c..75462506e6c8 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -48,8 +48,8 @@ public HasOnlyReadOnly() {
    */
   @JsonCreator
   public HasOnlyReadOnly(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar, 
-    @JsonProperty(JSON_PROPERTY_FOO) String foo
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar, 
+    @JsonProperty(value = JSON_PROPERTY_FOO, required = false) String foo
   ) {
     this();
     this.bar = bar;
@@ -61,7 +61,7 @@ public HasOnlyReadOnly(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -75,7 +75,7 @@ public String getBar() {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 8780c33267c5..7709e89cc9be 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -59,14 +59,14 @@ public String getNullableMessage() {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
     return nullableMessage;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   public void setNullableMessage_JsonNullable(JsonNullable<String> nullableMessage) {
     this.nullableMessage = nullableMessage;
   }
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/MapTest.java
index 226af5128b2b..94020730a719 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/MapTest.java
@@ -109,7 +109,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -117,7 +117,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -142,7 +142,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -150,7 +150,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -175,7 +175,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -183,7 +183,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -208,7 +208,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -216,7 +216,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index be9066f8a227..c515e1506f66 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -64,7 +64,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@javax.annotation.Nullab
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -72,7 +72,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -89,7 +89,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@javax.annotation.Nu
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -97,7 +97,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -122,7 +122,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -130,7 +130,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Model200Response.java
index f445295ef573..cc0125122612 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -55,7 +55,7 @@ public Model200Response name(@javax.annotation.Nullable Integer name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -63,7 +63,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -80,7 +80,7 @@ public Model200Response propertyClass(@javax.annotation.Nullable String property
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -88,7 +88,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 9fce2e1e3bab..4b9ecc77489a 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -60,7 +60,7 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -68,7 +68,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -85,7 +85,7 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -93,7 +93,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -110,7 +110,7 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -118,7 +118,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelFile.java
index b56cda290634..aafab80e041d 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -50,7 +50,7 @@ public ModelFile sourceURI(@javax.annotation.Nullable String sourceURI) {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -58,7 +58,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelList.java
index d0f770be3bdb..2ac93e97b4c5 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelList.java
@@ -50,7 +50,7 @@ public ModelList _123list(@javax.annotation.Nullable String _123list) {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -58,7 +58,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelReturn.java
index a5e4c8656d48..2e06a4c7a467 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -50,7 +50,7 @@ public ModelReturn _return(@javax.annotation.Nullable Integer _return) {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -58,7 +58,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Name.java
index 7c79599ff5d8..ead2b3b3e5f1 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Name.java
@@ -57,8 +57,8 @@ public Name() {
    */
   @JsonCreator
   public Name(
-    @JsonProperty(JSON_PROPERTY_SNAKE_CASE) Integer snakeCase, 
-    @JsonProperty(JSON_PROPERTY_123NUMBER) Integer _123number
+    @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false) Integer snakeCase, 
+    @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false) Integer _123number
   ) {
     this();
     this.snakeCase = snakeCase;
@@ -76,7 +76,7 @@ public Name name(@javax.annotation.Nonnull Integer name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -84,7 +84,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -95,7 +95,7 @@ public void setName(@javax.annotation.Nonnull Integer name) {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -115,7 +115,7 @@ public Name property(@javax.annotation.Nullable String property) {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -123,7 +123,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -134,7 +134,7 @@ public void setProperty(@javax.annotation.Nullable String property) {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/NullableClass.java
index 44dc3d35a5ac..957da40e0afb 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -123,14 +123,14 @@ public Integer getIntegerProp() {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
     return integerProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   public void setIntegerProp_JsonNullable(JsonNullable<Integer> integerProp) {
     this.integerProp = integerProp;
   }
@@ -156,14 +156,14 @@ public BigDecimal getNumberProp() {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
     return numberProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   public void setNumberProp_JsonNullable(JsonNullable<BigDecimal> numberProp) {
     this.numberProp = numberProp;
   }
@@ -189,14 +189,14 @@ public Boolean getBooleanProp() {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
     return booleanProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   public void setBooleanProp_JsonNullable(JsonNullable<Boolean> booleanProp) {
     this.booleanProp = booleanProp;
   }
@@ -222,14 +222,14 @@ public String getStringProp() {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
     return stringProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   public void setStringProp_JsonNullable(JsonNullable<String> stringProp) {
     this.stringProp = stringProp;
   }
@@ -255,14 +255,14 @@ public LocalDate getDateProp() {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
     return dateProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   public void setDateProp_JsonNullable(JsonNullable<LocalDate> dateProp) {
     this.dateProp = dateProp;
   }
@@ -288,14 +288,14 @@ public OffsetDateTime getDatetimeProp() {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
     return datetimeProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   public void setDatetimeProp_JsonNullable(JsonNullable<OffsetDateTime> datetimeProp) {
     this.datetimeProp = datetimeProp;
   }
@@ -333,14 +333,14 @@ public List<Object> getArrayNullableProp() {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
     return arrayNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   public void setArrayNullableProp_JsonNullable(JsonNullable<List<Object>> arrayNullableProp) {
     this.arrayNullableProp = arrayNullableProp;
   }
@@ -378,14 +378,14 @@ public List<Object> getArrayAndItemsNullableProp() {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
     return arrayAndItemsNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   public void setArrayAndItemsNullableProp_JsonNullable(JsonNullable<List<Object>> arrayAndItemsNullableProp) {
     this.arrayAndItemsNullableProp = arrayAndItemsNullableProp;
   }
@@ -413,7 +413,7 @@ public NullableClass addArrayItemsNullableItem(Object arrayItemsNullableItem) {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -421,7 +421,7 @@ public List<Object> getArrayItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -456,14 +456,14 @@ public Map<String, Object> getObjectNullableProp() {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
     return objectNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   public void setObjectNullableProp_JsonNullable(JsonNullable<Map<String, Object>> objectNullableProp) {
     this.objectNullableProp = objectNullableProp;
   }
@@ -501,14 +501,14 @@ public Map<String, Object> getObjectAndItemsNullableProp() {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
     return objectAndItemsNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   public void setObjectAndItemsNullableProp_JsonNullable(JsonNullable<Map<String, Object>> objectAndItemsNullableProp) {
     this.objectAndItemsNullableProp = objectAndItemsNullableProp;
   }
@@ -536,7 +536,7 @@ public NullableClass putObjectItemsNullableItem(String key, Object objectItemsNu
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -544,7 +544,7 @@ public Map<String, Object> getObjectItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/NumberOnly.java
index 2b2688a79089..264e825134f1 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -50,7 +50,7 @@ public NumberOnly justNumber(@javax.annotation.Nullable BigDecimal justNumber) {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -58,7 +58,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 027bfe18ab35..0cc1c49da6cc 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -69,7 +69,7 @@ public ObjectWithDeprecatedFields uuid(@javax.annotation.Nullable String uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -77,7 +77,7 @@ public String getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -96,7 +96,7 @@ public ObjectWithDeprecatedFields id(@javax.annotation.Nullable BigDecimal id) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -104,7 +104,7 @@ public BigDecimal getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -123,7 +123,7 @@ public ObjectWithDeprecatedFields deprecatedRef(@javax.annotation.Nullable Depre
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -131,7 +131,7 @@ public DeprecatedObject getDeprecatedRef() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -158,7 +158,7 @@ public ObjectWithDeprecatedFields addBarsItem(String barsItem) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -166,7 +166,7 @@ public List<String> getBars() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Order.java
index 19a6f2e22dd1..075006c47dc6 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Order.java
@@ -112,7 +112,7 @@ public Order id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -120,7 +120,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -137,7 +137,7 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -145,7 +145,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -162,7 +162,7 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -170,7 +170,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -187,7 +187,7 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -195,7 +195,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -212,7 +212,7 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -220,7 +220,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -237,7 +237,7 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -245,7 +245,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/OuterComposite.java
index 7b928ac82f35..14b334e4829a 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -60,7 +60,7 @@ public OuterComposite myNumber(@javax.annotation.Nullable BigDecimal myNumber) {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -68,7 +68,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -85,7 +85,7 @@ public OuterComposite myString(@javax.annotation.Nullable String myString) {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -93,7 +93,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -110,7 +110,7 @@ public OuterComposite myBoolean(@javax.annotation.Nullable Boolean myBoolean) {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -118,7 +118,7 @@ public Boolean getMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index a8d574446886..135239e327cd 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -50,7 +50,7 @@ public OuterObjectWithEnumProperty value(@javax.annotation.Nonnull OuterEnumInte
    * @return value
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -58,7 +58,7 @@ public OuterEnumInteger getValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@javax.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index 44d26ee7013f..3715d9705a18 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -103,7 +103,7 @@ public ParentWithNullable type(@javax.annotation.Nullable TypeEnum type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -111,7 +111,7 @@ public TypeEnum getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -134,14 +134,14 @@ public String getNullableProperty() {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
     return nullableProperty;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   public void setNullableProperty_JsonNullable(JsonNullable<String> nullableProperty) {
     this.nullableProperty = nullableProperty;
   }
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Pet.java
index 9c64c19a7c2c..6642f3237661 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Pet.java
@@ -119,7 +119,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -127,7 +127,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -144,7 +144,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -152,7 +152,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -169,7 +169,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -177,7 +177,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -202,7 +202,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -211,7 +211,7 @@ public Set<String> getPhotoUrls() {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -236,7 +236,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -244,7 +244,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -261,7 +261,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -269,7 +269,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 784d47d6a106..eeffca460496 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -47,7 +47,7 @@ public ReadOnlyFirst() {
    */
   @JsonCreator
   public ReadOnlyFirst(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar
   ) {
     this();
     this.bar = bar;
@@ -58,7 +58,7 @@ public ReadOnlyFirst(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -78,7 +78,7 @@ public ReadOnlyFirst baz(@javax.annotation.Nullable String baz) {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -86,7 +86,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 7e37da197795..59e71d9aff56 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -50,7 +50,7 @@ public SpecialModelName() {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -58,7 +58,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Tag.java
index fc2ee7bfc564..83ece7141a46 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Tag.java
@@ -54,7 +54,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index b8c473679982..b6f471f25bb2 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -53,7 +53,7 @@ public TestInlineFreeformAdditionalPropertiesRequest someProperty(@javax.annotat
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -61,7 +61,7 @@ public String getSomeProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/User.java
index 4aa0d35c2889..7a457acb78ba 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/User.java
@@ -84,7 +84,7 @@ public User id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -92,7 +92,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -109,7 +109,7 @@ public User username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -117,7 +117,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -134,7 +134,7 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -142,7 +142,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -159,7 +159,7 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -167,7 +167,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -184,7 +184,7 @@ public User email(@javax.annotation.Nullable String email) {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -192,7 +192,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -209,7 +209,7 @@ public User password(@javax.annotation.Nullable String password) {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -217,7 +217,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -234,7 +234,7 @@ public User phone(@javax.annotation.Nullable String phone) {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -242,7 +242,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -259,7 +259,7 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -267,7 +267,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 50012bf36e00..2ec227110a06 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -64,7 +64,7 @@ public AdditionalPropertiesClass putMapPropertyItem(String key, String mapProper
    * @return mapProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -72,7 +72,7 @@ public Map<String, String> getMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@jakarta.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -97,7 +97,7 @@ public AdditionalPropertiesClass putMapOfMapPropertyItem(String key, Map<String,
    * @return mapOfMapProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -105,7 +105,7 @@ public Map<String, Map<String, String>> getMapOfMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 2157a4ba6b42..5429da5b41bc 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -55,7 +55,7 @@ public AllOfWithSingleRef username(@jakarta.annotation.Nullable String username)
    * @return username
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -63,7 +63,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -80,7 +80,7 @@ public AllOfWithSingleRef singleRefType(@jakarta.annotation.Nullable SingleRefTy
    * @return singleRefType
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -88,7 +88,7 @@ public SingleRefType getSingleRefType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@jakarta.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Animal.java
index 3274f77cbd1b..74d5ec2c0dd5 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Animal.java
@@ -67,7 +67,7 @@ public Animal className(@jakarta.annotation.Nonnull String className) {
    * @return className
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -75,7 +75,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
@@ -92,7 +92,7 @@ public Animal color(@jakarta.annotation.Nullable String color) {
    * @return color
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -100,7 +100,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@jakarta.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index cec6f26d43e1..40f5d22205f2 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -61,7 +61,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    * @return arrayArrayNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -69,7 +69,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@jakarta.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 0c7c87d51c0a..9f31976efebb 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -61,7 +61,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    * @return arrayNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -69,7 +69,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@jakarta.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayTest.java
index 544b8b8c96c0..0bcdf9063c53 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -71,7 +71,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    * @return arrayOfString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -79,7 +79,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@jakarta.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -104,7 +104,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    * @return arrayArrayOfInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -112,7 +112,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@jakarta.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -137,7 +137,7 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    * @return arrayArrayOfModel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -145,7 +145,7 @@ public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@jakarta.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Capitalization.java
index a753be1304e5..22b9a68f8c05 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -74,7 +74,7 @@ public Capitalization smallCamel(@jakarta.annotation.Nullable String smallCamel)
    * @return smallCamel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -82,7 +82,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@jakarta.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -99,7 +99,7 @@ public Capitalization capitalCamel(@jakarta.annotation.Nullable String capitalCa
    * @return capitalCamel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -107,7 +107,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@jakarta.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -124,7 +124,7 @@ public Capitalization smallSnake(@jakarta.annotation.Nullable String smallSnake)
    * @return smallSnake
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -132,7 +132,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@jakarta.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -149,7 +149,7 @@ public Capitalization capitalSnake(@jakarta.annotation.Nullable String capitalSn
    * @return capitalSnake
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -157,7 +157,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@jakarta.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -174,7 +174,7 @@ public Capitalization scAETHFlowPoints(@jakarta.annotation.Nullable String scAET
    * @return scAETHFlowPoints
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -182,7 +182,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@jakarta.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -199,7 +199,7 @@ public Capitalization ATT_NAME(@jakarta.annotation.Nullable String ATT_NAME) {
    * @return ATT_NAME
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -207,7 +207,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@jakarta.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Cat.java
index 5ff82fe97cd7..d4359a4ee859 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Cat.java
@@ -60,7 +60,7 @@ public Cat declawed(@jakarta.annotation.Nullable Boolean declawed) {
    * @return declawed
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -68,7 +68,7 @@ public Boolean getDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@jakarta.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Category.java
index 48db624380a2..824db05eebb2 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Category.java
@@ -54,7 +54,7 @@ public Category id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Category name(@jakarta.annotation.Nonnull String name) {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index 21d3eda8510a..9125a5d412b7 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -61,7 +61,7 @@ public ChildWithNullable otherProperty(@jakarta.annotation.Nullable String other
    * @return otherProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -69,7 +69,7 @@ public String getOtherProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@jakarta.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ClassModel.java
index 2d4ce856a48c..a0bb6e7714ea 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -49,7 +49,7 @@ public ClassModel propertyClass(@jakarta.annotation.Nullable String propertyClas
    * @return propertyClass
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -57,7 +57,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Client.java
index aaa5d5bc5cb1..b85db3275d5d 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Client.java
@@ -49,7 +49,7 @@ public Client client(@jakarta.annotation.Nullable String client) {
    * @return client
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -57,7 +57,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@jakarta.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 4b3e7e3cc82f..db6d1a31352b 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -51,7 +51,7 @@ public DeprecatedObject name(@jakarta.annotation.Nullable String name) {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -59,7 +59,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Dog.java
index ebb51c2380db..61e0481db5e8 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Dog.java
@@ -60,7 +60,7 @@ public Dog breed(@jakarta.annotation.Nullable String breed) {
    * @return breed
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -68,7 +68,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@jakarta.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/EnumArrays.java
index a8f3109c530c..eca986e96ae3 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -127,7 +127,7 @@ public EnumArrays justSymbol(@jakarta.annotation.Nullable JustSymbolEnum justSym
    * @return justSymbol
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -135,7 +135,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@jakarta.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -160,7 +160,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    * @return arrayEnum
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -168,7 +168,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@jakarta.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/EnumTest.java
index 6c590326e29a..9c6a97f8cac2 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -237,7 +237,7 @@ public EnumTest enumString(@jakarta.annotation.Nullable EnumStringEnum enumStrin
    * @return enumString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -245,7 +245,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@jakarta.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -262,7 +262,7 @@ public EnumTest enumStringRequired(@jakarta.annotation.Nonnull EnumStringRequire
    * @return enumStringRequired
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -270,7 +270,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@jakarta.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -287,7 +287,7 @@ public EnumTest enumInteger(@jakarta.annotation.Nullable EnumIntegerEnum enumInt
    * @return enumInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -295,7 +295,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@jakarta.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -312,7 +312,7 @@ public EnumTest enumNumber(@jakarta.annotation.Nullable EnumNumberEnum enumNumbe
    * @return enumNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -320,7 +320,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@jakarta.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -343,7 +343,7 @@ public OuterEnum getOuterEnum() {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -370,7 +370,7 @@ public EnumTest outerEnumInteger(@jakarta.annotation.Nullable OuterEnumInteger o
    * @return outerEnumInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -378,7 +378,7 @@ public OuterEnumInteger getOuterEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@jakarta.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -395,7 +395,7 @@ public EnumTest outerEnumDefaultValue(@jakarta.annotation.Nullable OuterEnumDefa
    * @return outerEnumDefaultValue
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -403,7 +403,7 @@ public OuterEnumDefaultValue getOuterEnumDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@jakarta.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -420,7 +420,7 @@ public EnumTest outerEnumIntegerDefaultValue(@jakarta.annotation.Nullable OuterE
    * @return outerEnumIntegerDefaultValue
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -428,7 +428,7 @@ public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@jakarta.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 0040ba872d12..57eb9dd857b5 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -58,7 +58,7 @@ public FakeBigDecimalMap200Response someId(@jakarta.annotation.Nullable BigDecim
    * @return someId
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -66,7 +66,7 @@ public BigDecimal getSomeId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@jakarta.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -91,7 +91,7 @@ public FakeBigDecimalMap200Response putSomeMapItem(String key, BigDecimal someMa
    * @return someMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -99,7 +99,7 @@ public Map<String, BigDecimal> getSomeMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@jakarta.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 20bf48a4fbf8..eecdfc9fce05 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -58,7 +58,7 @@ public FileSchemaTestClass _file(@jakarta.annotation.Nullable ModelFile _file) {
    * @return _file
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -66,7 +66,7 @@ public ModelFile getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@jakarta.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -91,7 +91,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
    * @return files
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -99,7 +99,7 @@ public List<ModelFile> getFiles() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@jakarta.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Foo.java
index 3148863d4f4d..80df9e1cb925 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Foo.java
@@ -49,7 +49,7 @@ public Foo bar(@jakarta.annotation.Nullable String bar) {
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -57,7 +57,7 @@ public String getBar() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@jakarta.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 6ac11e76f1c7..0f8c77a62cd7 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -51,7 +51,7 @@ public FooGetDefaultResponse string(@jakarta.annotation.Nullable Foo string) {
    * @return string
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -59,7 +59,7 @@ public Foo getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FormatTest.java
index f3ae59dd0eff..de091792eb7b 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -132,7 +132,7 @@ public FormatTest integer(@jakarta.annotation.Nullable Integer integer) {
    * @return integer
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -140,7 +140,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@jakarta.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -159,7 +159,7 @@ public FormatTest int32(@jakarta.annotation.Nullable Integer int32) {
    * @return int32
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -167,7 +167,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@jakarta.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -184,7 +184,7 @@ public FormatTest int64(@jakarta.annotation.Nullable Long int64) {
    * @return int64
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -192,7 +192,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@jakarta.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -211,7 +211,7 @@ public FormatTest number(@jakarta.annotation.Nonnull BigDecimal number) {
    * @return number
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -219,7 +219,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@jakarta.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -238,7 +238,7 @@ public FormatTest _float(@jakarta.annotation.Nullable Float _float) {
    * @return _float
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -246,7 +246,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@jakarta.annotation.Nullable Float _float) {
     this._float = _float;
@@ -265,7 +265,7 @@ public FormatTest _double(@jakarta.annotation.Nullable Double _double) {
    * @return _double
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -273,7 +273,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@jakarta.annotation.Nullable Double _double) {
     this._double = _double;
@@ -290,7 +290,7 @@ public FormatTest decimal(@jakarta.annotation.Nullable BigDecimal decimal) {
    * @return decimal
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -298,7 +298,7 @@ public BigDecimal getDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@jakarta.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -315,7 +315,7 @@ public FormatTest string(@jakarta.annotation.Nullable String string) {
    * @return string
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -323,7 +323,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable String string) {
     this.string = string;
@@ -340,7 +340,7 @@ public FormatTest _byte(@jakarta.annotation.Nonnull byte[] _byte) {
    * @return _byte
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -348,7 +348,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@jakarta.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -365,7 +365,7 @@ public FormatTest binary(@jakarta.annotation.Nullable File binary) {
    * @return binary
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -373,7 +373,7 @@ public File getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@jakarta.annotation.Nullable File binary) {
     this.binary = binary;
@@ -390,7 +390,7 @@ public FormatTest date(@jakarta.annotation.Nonnull LocalDate date) {
    * @return date
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -398,7 +398,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@jakarta.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -415,7 +415,7 @@ public FormatTest dateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime)
    * @return dateTime
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -423,7 +423,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -440,7 +440,7 @@ public FormatTest uuid(@jakarta.annotation.Nullable UUID uuid) {
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -448,7 +448,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -465,7 +465,7 @@ public FormatTest password(@jakarta.annotation.Nonnull String password) {
    * @return password
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -473,7 +473,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@jakarta.annotation.Nonnull String password) {
     this.password = password;
@@ -490,7 +490,7 @@ public FormatTest patternWithDigits(@jakarta.annotation.Nullable String patternW
    * @return patternWithDigits
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -498,7 +498,7 @@ public String getPatternWithDigits() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@jakarta.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -515,7 +515,7 @@ public FormatTest patternWithDigitsAndDelimiter(@jakarta.annotation.Nullable Str
    * @return patternWithDigitsAndDelimiter
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -523,7 +523,7 @@ public String getPatternWithDigitsAndDelimiter() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@jakarta.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 6bea63e846c5..f61355aa4a31 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -61,7 +61,7 @@ public HasOnlyReadOnly(
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -75,7 +75,7 @@ public String getBar() {
    * @return foo
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index b76b927d3712..3d3e903fa7d3 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -59,7 +59,7 @@ public String getNullableMessage() {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/MapTest.java
index 37b4b8ab0534..0b46bbf13ab7 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/MapTest.java
@@ -109,7 +109,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    * @return mapMapOfString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -117,7 +117,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -142,7 +142,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    * @return mapOfEnumString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -150,7 +150,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@jakarta.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -175,7 +175,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    * @return directMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -183,7 +183,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@jakarta.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -208,7 +208,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    * @return indirectMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -216,7 +216,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@jakarta.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 44989079af56..b0e481f072ed 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -64,7 +64,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@jakarta.annotation.Null
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -72,7 +72,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -89,7 +89,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@jakarta.annotation.
    * @return dateTime
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -97,7 +97,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -122,7 +122,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    * @return map
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -130,7 +130,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@jakarta.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Model200Response.java
index 0d7e33e689d8..3cbc04abee52 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -55,7 +55,7 @@ public Model200Response name(@jakarta.annotation.Nullable Integer name) {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -63,7 +63,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable Integer name) {
     this.name = name;
@@ -80,7 +80,7 @@ public Model200Response propertyClass(@jakarta.annotation.Nullable String proper
    * @return propertyClass
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -88,7 +88,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 906c779a9463..b7a2f7c875a6 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -60,7 +60,7 @@ public ModelApiResponse code(@jakarta.annotation.Nullable Integer code) {
    * @return code
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -68,7 +68,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@jakarta.annotation.Nullable Integer code) {
     this.code = code;
@@ -85,7 +85,7 @@ public ModelApiResponse type(@jakarta.annotation.Nullable String type) {
    * @return type
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -93,7 +93,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable String type) {
     this.type = type;
@@ -110,7 +110,7 @@ public ModelApiResponse message(@jakarta.annotation.Nullable String message) {
    * @return message
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -118,7 +118,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@jakarta.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelFile.java
index 121184edefe7..a650da26059a 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -50,7 +50,7 @@ public ModelFile sourceURI(@jakarta.annotation.Nullable String sourceURI) {
    * @return sourceURI
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -58,7 +58,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@jakarta.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelList.java
index 9edd6c3af92c..b91216af7693 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelList.java
@@ -50,7 +50,7 @@ public ModelList _123list(@jakarta.annotation.Nullable String _123list) {
    * @return _123list
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -58,7 +58,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@jakarta.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelReturn.java
index 3d34003aa76f..c1b66567ebc3 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -50,7 +50,7 @@ public ModelReturn _return(@jakarta.annotation.Nullable Integer _return) {
    * @return _return
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -58,7 +58,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@jakarta.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Name.java
index 0a5893c68eb6..0b472aabaad8 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Name.java
@@ -76,7 +76,7 @@ public Name name(@jakarta.annotation.Nonnull Integer name) {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -84,7 +84,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull Integer name) {
     this.name = name;
@@ -95,7 +95,7 @@ public void setName(@jakarta.annotation.Nonnull Integer name) {
    * @return snakeCase
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -115,7 +115,7 @@ public Name property(@jakarta.annotation.Nullable String property) {
    * @return property
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -123,7 +123,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@jakarta.annotation.Nullable String property) {
     this.property = property;
@@ -134,7 +134,7 @@ public void setProperty(@jakarta.annotation.Nullable String property) {
    * @return _123number
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/NullableClass.java
index cd7720c77a2a..cad6af5dea7b 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -126,7 +126,7 @@ public Integer getIntegerProp() {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -159,7 +159,7 @@ public BigDecimal getNumberProp() {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -192,7 +192,7 @@ public Boolean getBooleanProp() {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -225,7 +225,7 @@ public String getStringProp() {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -258,7 +258,7 @@ public LocalDate getDateProp() {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -291,7 +291,7 @@ public OffsetDateTime getDatetimeProp() {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -336,7 +336,7 @@ public List<Object> getArrayNullableProp() {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -381,7 +381,7 @@ public List<Object> getArrayAndItemsNullableProp() {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -416,7 +416,7 @@ public NullableClass addArrayItemsNullableItem(Object arrayItemsNullableItem) {
    * @return arrayItemsNullable
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -424,7 +424,7 @@ public List<Object> getArrayItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@jakarta.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -459,7 +459,7 @@ public Map<String, Object> getObjectNullableProp() {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -504,7 +504,7 @@ public Map<String, Object> getObjectAndItemsNullableProp() {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -539,7 +539,7 @@ public NullableClass putObjectItemsNullableItem(String key, Object objectItemsNu
    * @return objectItemsNullable
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -547,7 +547,7 @@ public Map<String, Object> getObjectItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@jakarta.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/NumberOnly.java
index 2a5a8ce402cd..58e4348268f8 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -50,7 +50,7 @@ public NumberOnly justNumber(@jakarta.annotation.Nullable BigDecimal justNumber)
    * @return justNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -58,7 +58,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@jakarta.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index e57217ff8558..a34d4294a435 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -69,7 +69,7 @@ public ObjectWithDeprecatedFields uuid(@jakarta.annotation.Nullable String uuid)
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -77,7 +77,7 @@ public String getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -96,7 +96,7 @@ public ObjectWithDeprecatedFields id(@jakarta.annotation.Nullable BigDecimal id)
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -104,7 +104,7 @@ public BigDecimal getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -123,7 +123,7 @@ public ObjectWithDeprecatedFields deprecatedRef(@jakarta.annotation.Nullable Dep
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -131,7 +131,7 @@ public DeprecatedObject getDeprecatedRef() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@jakarta.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -158,7 +158,7 @@ public ObjectWithDeprecatedFields addBarsItem(String barsItem) {
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -166,7 +166,7 @@ public List<String> getBars() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@jakarta.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Order.java
index a56e4ae44164..eb074141df95 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Order.java
@@ -112,7 +112,7 @@ public Order id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -120,7 +120,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -137,7 +137,7 @@ public Order petId(@jakarta.annotation.Nullable Long petId) {
    * @return petId
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -145,7 +145,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@jakarta.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -162,7 +162,7 @@ public Order quantity(@jakarta.annotation.Nullable Integer quantity) {
    * @return quantity
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -170,7 +170,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@jakarta.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -187,7 +187,7 @@ public Order shipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
    * @return shipDate
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -195,7 +195,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -212,7 +212,7 @@ public Order status(@jakarta.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -220,7 +220,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -237,7 +237,7 @@ public Order complete(@jakarta.annotation.Nullable Boolean complete) {
    * @return complete
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -245,7 +245,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@jakarta.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/OuterComposite.java
index b7c13c4419c3..e1355c3c059f 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -60,7 +60,7 @@ public OuterComposite myNumber(@jakarta.annotation.Nullable BigDecimal myNumber)
    * @return myNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -68,7 +68,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@jakarta.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -85,7 +85,7 @@ public OuterComposite myString(@jakarta.annotation.Nullable String myString) {
    * @return myString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -93,7 +93,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@jakarta.annotation.Nullable String myString) {
     this.myString = myString;
@@ -110,7 +110,7 @@ public OuterComposite myBoolean(@jakarta.annotation.Nullable Boolean myBoolean)
    * @return myBoolean
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -118,7 +118,7 @@ public Boolean getMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@jakarta.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index b8a916d18bc9..38ae05820a92 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -50,7 +50,7 @@ public OuterObjectWithEnumProperty value(@jakarta.annotation.Nonnull OuterEnumIn
    * @return value
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -58,7 +58,7 @@ public OuterEnumInteger getValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@jakarta.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index b73a8442f484..e1fe5924b621 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -103,7 +103,7 @@ public ParentWithNullable type(@jakarta.annotation.Nullable TypeEnum type) {
    * @return type
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -111,7 +111,7 @@ public TypeEnum getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -134,7 +134,7 @@ public String getNullableProperty() {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Pet.java
index 72970e8e30e8..6b0eea88165d 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Pet.java
@@ -119,7 +119,7 @@ public Pet id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -127,7 +127,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -144,7 +144,7 @@ public Pet category(@jakarta.annotation.Nullable Category category) {
    * @return category
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -152,7 +152,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@jakarta.annotation.Nullable Category category) {
     this.category = category;
@@ -169,7 +169,7 @@ public Pet name(@jakarta.annotation.Nonnull String name) {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -177,7 +177,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
@@ -202,7 +202,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -211,7 +211,7 @@ public Set<String> getPhotoUrls() {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@jakarta.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -236,7 +236,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -244,7 +244,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@jakarta.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -261,7 +261,7 @@ public Pet status(@jakarta.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -269,7 +269,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index c0c19abefdc2..0850de61e5d8 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -58,7 +58,7 @@ public ReadOnlyFirst(
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -78,7 +78,7 @@ public ReadOnlyFirst baz(@jakarta.annotation.Nullable String baz) {
    * @return baz
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -86,7 +86,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@jakarta.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 165ddaf59557..abbe5c8625f4 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -50,7 +50,7 @@ public SpecialModelName() {
    * @return $specialPropertyName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -58,7 +58,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@jakarta.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Tag.java
index 8cd92ee44667..38b6df8923ef 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Tag.java
@@ -54,7 +54,7 @@ public Tag id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Tag name(@jakarta.annotation.Nullable String name) {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index ac4219746a5b..68df1383aee0 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -54,7 +54,7 @@ public TestInlineFreeformAdditionalPropertiesRequest someProperty(@jakarta.annot
    * @return someProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -62,7 +62,7 @@ public String getSomeProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@jakarta.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/User.java
index 4797773fc12d..0a9c70b92ba8 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/User.java
@@ -84,7 +84,7 @@ public User id(@jakarta.annotation.Nullable Long id) {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -92,7 +92,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -109,7 +109,7 @@ public User username(@jakarta.annotation.Nullable String username) {
    * @return username
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -117,7 +117,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -134,7 +134,7 @@ public User firstName(@jakarta.annotation.Nullable String firstName) {
    * @return firstName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -142,7 +142,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@jakarta.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -159,7 +159,7 @@ public User lastName(@jakarta.annotation.Nullable String lastName) {
    * @return lastName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -167,7 +167,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@jakarta.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -184,7 +184,7 @@ public User email(@jakarta.annotation.Nullable String email) {
    * @return email
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -192,7 +192,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@jakarta.annotation.Nullable String email) {
     this.email = email;
@@ -209,7 +209,7 @@ public User password(@jakarta.annotation.Nullable String password) {
    * @return password
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -217,7 +217,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@jakarta.annotation.Nullable String password) {
     this.password = password;
@@ -234,7 +234,7 @@ public User phone(@jakarta.annotation.Nullable String phone) {
    * @return phone
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -242,7 +242,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@jakarta.annotation.Nullable String phone) {
     this.phone = phone;
@@ -259,7 +259,7 @@ public User userStatus(@jakarta.annotation.Nullable Integer userStatus) {
    * @return userStatus
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -267,7 +267,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@jakarta.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/webclient-nullable-arrays/src/main/java/org/openapitools/client/model/ByteArrayObject.java b/samples/client/petstore/java/webclient-nullable-arrays/src/main/java/org/openapitools/client/model/ByteArrayObject.java
index 3f0e6c36f70a..daa131005c2b 100644
--- a/samples/client/petstore/java/webclient-nullable-arrays/src/main/java/org/openapitools/client/model/ByteArrayObject.java
+++ b/samples/client/petstore/java/webclient-nullable-arrays/src/main/java/org/openapitools/client/model/ByteArrayObject.java
@@ -80,7 +80,7 @@ public byte[] getNullableArray() {
         return nullableArray.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<byte[]> getNullableArray_JsonNullable() {
@@ -107,7 +107,7 @@ public ByteArrayObject normalArray(@javax.annotation.Nullable byte[] normalArray
    * @return normalArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NORMAL_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NORMAL_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public byte[] getNormalArray() {
@@ -115,7 +115,7 @@ public byte[] getNormalArray() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NORMAL_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NORMAL_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNormalArray(@javax.annotation.Nullable byte[] normalArray) {
     this.normalArray = normalArray;
@@ -138,7 +138,7 @@ public String getNullableString() {
         return nullableString.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableString_JsonNullable() {
@@ -165,7 +165,7 @@ public ByteArrayObject stringField(@javax.annotation.Nullable String stringField
    * @return stringField
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING_FIELD)
+  @JsonProperty(value = JSON_PROPERTY_STRING_FIELD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getStringField() {
@@ -173,7 +173,7 @@ public String getStringField() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_FIELD)
+  @JsonProperty(value = JSON_PROPERTY_STRING_FIELD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStringField(@javax.annotation.Nullable String stringField) {
     this.stringField = stringField;
@@ -190,7 +190,7 @@ public ByteArrayObject intField(@javax.annotation.Nullable BigDecimal intField)
    * @return intField
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT_FIELD)
+  @JsonProperty(value = JSON_PROPERTY_INT_FIELD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getIntField() {
@@ -198,7 +198,7 @@ public BigDecimal getIntField() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT_FIELD)
+  @JsonProperty(value = JSON_PROPERTY_INT_FIELD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIntField(@javax.annotation.Nullable BigDecimal intField) {
     this.intField = intField;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 534e9862e670..4c919d5a73eb 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -66,7 +66,7 @@ public AdditionalPropertiesClass putMapPropertyItem(String key, String mapProper
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -74,7 +74,7 @@ public Map<String, String> getMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -100,7 +100,7 @@ public AdditionalPropertiesClass putMapOfMapPropertyItem(String key, Map<String,
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -108,7 +108,7 @@ public Map<String, Map<String, String>> getMapOfMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 81549920d87b..1ae03ab05b69 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -57,7 +57,7 @@ public AllOfWithSingleRef username(@javax.annotation.Nullable String username) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -65,7 +65,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -83,7 +83,7 @@ public AllOfWithSingleRef singleRefType(@javax.annotation.Nullable SingleRefType
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -91,7 +91,7 @@ public SingleRefType getSingleRefType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@javax.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Animal.java
index c99a6ed66710..72e9fdfd07b1 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Animal.java
@@ -69,7 +69,7 @@ public Animal className(@javax.annotation.Nonnull String className) {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -77,7 +77,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -95,7 +95,7 @@ public Animal color(@javax.annotation.Nullable String color) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -103,7 +103,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index e19536894673..c5c1722cbdd2 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -63,7 +63,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -71,7 +71,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index c60ef597ba24..1a6503f77ccc 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -63,7 +63,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -71,7 +71,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayTest.java
index a80ea07ff1dd..5dce463a8a9d 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -73,7 +73,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -81,7 +81,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -107,7 +107,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -115,7 +115,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -141,7 +141,7 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -149,7 +149,7 @@ public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Capitalization.java
index b303e786914a..e219d1621bd6 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -76,7 +76,7 @@ public Capitalization smallCamel(@javax.annotation.Nullable String smallCamel) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -84,7 +84,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -102,7 +102,7 @@ public Capitalization capitalCamel(@javax.annotation.Nullable String capitalCame
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -110,7 +110,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -128,7 +128,7 @@ public Capitalization smallSnake(@javax.annotation.Nullable String smallSnake) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -136,7 +136,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -154,7 +154,7 @@ public Capitalization capitalSnake(@javax.annotation.Nullable String capitalSnak
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -162,7 +162,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -180,7 +180,7 @@ public Capitalization scAETHFlowPoints(@javax.annotation.Nullable String scAETHF
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -188,7 +188,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -206,7 +206,7 @@ public Capitalization ATT_NAME(@javax.annotation.Nullable String ATT_NAME) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "Name of the pet ")
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -214,7 +214,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Cat.java
index c0c03ddf058b..1812480147c9 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Cat.java
@@ -62,7 +62,7 @@ public Cat declawed(@javax.annotation.Nullable Boolean declawed) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -70,7 +70,7 @@ public Boolean getDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Category.java
index d34d45f294e1..95a618e267d6 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Category.java
@@ -56,7 +56,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -64,7 +64,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -82,7 +82,7 @@ public Category name(@javax.annotation.Nonnull String name) {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -90,7 +90,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index be6a2e370fe4..7199994e2c6c 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -63,7 +63,7 @@ public ChildWithNullable otherProperty(@javax.annotation.Nullable String otherPr
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -71,7 +71,7 @@ public String getOtherProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@javax.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ClassModel.java
index 8eced1e66aca..0c6a6a802f7b 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -52,7 +52,7 @@ public ClassModel propertyClass(@javax.annotation.Nullable String propertyClass)
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -60,7 +60,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Client.java
index 50d3d26c2cb6..28e7093b8581 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Client.java
@@ -51,7 +51,7 @@ public Client client(@javax.annotation.Nullable String client) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -59,7 +59,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 607e97de8aaa..7ce058e4bda3 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -53,7 +53,7 @@ public DeprecatedObject name(@javax.annotation.Nullable String name) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -61,7 +61,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Dog.java
index 4bb464f329a5..70cb2a1435c5 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Dog.java
@@ -62,7 +62,7 @@ public Dog breed(@javax.annotation.Nullable String breed) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -70,7 +70,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/EnumArrays.java
index 8694502d213b..5571fbac601e 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -129,7 +129,7 @@ public EnumArrays justSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbo
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -137,7 +137,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -163,7 +163,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -171,7 +171,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/EnumTest.java
index 2bc1205e57ed..5df9500c79eb 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -239,7 +239,7 @@ public EnumTest enumString(@javax.annotation.Nullable EnumStringEnum enumString)
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -247,7 +247,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -265,7 +265,7 @@ public EnumTest enumStringRequired(@javax.annotation.Nonnull EnumStringRequiredE
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -273,7 +273,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -291,7 +291,7 @@ public EnumTest enumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteg
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -299,7 +299,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -317,7 +317,7 @@ public EnumTest enumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber)
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -325,7 +325,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -349,7 +349,7 @@ public OuterEnum getOuterEnum() {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -377,7 +377,7 @@ public EnumTest outerEnumInteger(@javax.annotation.Nullable OuterEnumInteger out
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -385,7 +385,7 @@ public OuterEnumInteger getOuterEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -403,7 +403,7 @@ public EnumTest outerEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaul
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -411,7 +411,7 @@ public OuterEnumDefaultValue getOuterEnumDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -429,7 +429,7 @@ public EnumTest outerEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnu
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -437,7 +437,7 @@ public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 7d6df589c8c4..0cba1fe1eea0 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -60,7 +60,7 @@ public FakeBigDecimalMap200Response someId(@javax.annotation.Nullable BigDecimal
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -68,7 +68,7 @@ public BigDecimal getSomeId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -94,7 +94,7 @@ public FakeBigDecimalMap200Response putSomeMapItem(String key, BigDecimal someMa
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -102,7 +102,7 @@ public Map<String, BigDecimal> getSomeMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 8a872bf0fe64..581a22ffac14 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -60,7 +60,7 @@ public FileSchemaTestClass _file(@javax.annotation.Nullable ModelFile _file) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -68,7 +68,7 @@ public ModelFile getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -94,7 +94,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -102,7 +102,7 @@ public List<ModelFile> getFiles() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Foo.java
index f6283fed9d88..91796375cd14 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Foo.java
@@ -51,7 +51,7 @@ public Foo bar(@javax.annotation.Nullable String bar) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -59,7 +59,7 @@ public String getBar() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 360c097b6285..626dc5c8db4f 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -53,7 +53,7 @@ public FooGetDefaultResponse string(@javax.annotation.Nullable Foo string) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -61,7 +61,7 @@ public Foo getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FormatTest.java
index fe77850ae67c..c54d93bf5316 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -134,7 +134,7 @@ public FormatTest integer(@javax.annotation.Nullable Integer integer) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -142,7 +142,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -162,7 +162,7 @@ public FormatTest int32(@javax.annotation.Nullable Integer int32) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -170,7 +170,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -188,7 +188,7 @@ public FormatTest int64(@javax.annotation.Nullable Long int64) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -196,7 +196,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -216,7 +216,7 @@ public FormatTest number(@javax.annotation.Nonnull BigDecimal number) {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -224,7 +224,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -244,7 +244,7 @@ public FormatTest _float(@javax.annotation.Nullable Float _float) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -252,7 +252,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -272,7 +272,7 @@ public FormatTest _double(@javax.annotation.Nullable Double _double) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -280,7 +280,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -298,7 +298,7 @@ public FormatTest decimal(@javax.annotation.Nullable BigDecimal decimal) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -306,7 +306,7 @@ public BigDecimal getDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -324,7 +324,7 @@ public FormatTest string(@javax.annotation.Nullable String string) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -332,7 +332,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -350,7 +350,7 @@ public FormatTest _byte(@javax.annotation.Nonnull byte[] _byte) {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -358,7 +358,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -376,7 +376,7 @@ public FormatTest binary(@javax.annotation.Nullable File binary) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -384,7 +384,7 @@ public File getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -402,7 +402,7 @@ public FormatTest date(@javax.annotation.Nonnull LocalDate date) {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -410,7 +410,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -428,7 +428,7 @@ public FormatTest dateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -436,7 +436,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -454,7 +454,7 @@ public FormatTest uuid(@javax.annotation.Nullable UUID uuid) {
    */
   @javax.annotation.Nullable
   @Schema(example = "72f98069-206d-4f12-9f12-3d1e525a8e84", requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -462,7 +462,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -480,7 +480,7 @@ public FormatTest password(@javax.annotation.Nonnull String password) {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -488,7 +488,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -506,7 +506,7 @@ public FormatTest patternWithDigits(@javax.annotation.Nullable String patternWit
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "A string that is a 10 digit number. Can have leading zeros.")
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -514,7 +514,7 @@ public String getPatternWithDigits() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -532,7 +532,7 @@ public FormatTest patternWithDigitsAndDelimiter(@javax.annotation.Nullable Strin
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "A string starting with 'image_' (case insensitive) and one to three digits following i.e. Image_01.")
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -540,7 +540,7 @@ public String getPatternWithDigitsAndDelimiter() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 63d52d72f861..f2c424518833 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -63,7 +63,7 @@ public HasOnlyReadOnly(
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -78,7 +78,7 @@ public String getBar() {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 21537f960dfd..b6325092ce99 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -62,7 +62,7 @@ public String getNullableMessage() {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/MapTest.java
index 64252cb56297..41700849ffc6 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/MapTest.java
@@ -111,7 +111,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -119,7 +119,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -145,7 +145,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -153,7 +153,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -179,7 +179,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -187,7 +187,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -213,7 +213,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -221,7 +221,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 7a95242d32e2..294f634f6b17 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -66,7 +66,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@javax.annotation.Nullab
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -74,7 +74,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -92,7 +92,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@javax.annotation.Nu
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -100,7 +100,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -126,7 +126,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -134,7 +134,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Model200Response.java
index e5db6fbce524..b65c9a6a5075 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -58,7 +58,7 @@ public Model200Response name(@javax.annotation.Nullable Integer name) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -66,7 +66,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -84,7 +84,7 @@ public Model200Response propertyClass(@javax.annotation.Nullable String property
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -92,7 +92,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index e830adbf21e7..b3eb11aa06ad 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -62,7 +62,7 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -70,7 +70,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -88,7 +88,7 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -96,7 +96,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -114,7 +114,7 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -122,7 +122,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelFile.java
index c1a983e07fdc..6ca67972e1a2 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -53,7 +53,7 @@ public ModelFile sourceURI(@javax.annotation.Nullable String sourceURI) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "Test capitalization")
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -61,7 +61,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelList.java
index 4a56c386c5a4..3464b87b4ac3 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelList.java
@@ -52,7 +52,7 @@ public ModelList _123list(@javax.annotation.Nullable String _123list) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -60,7 +60,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelReturn.java
index 1670a06a3ba0..4a2555c76c9c 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -53,7 +53,7 @@ public ModelReturn _return(@javax.annotation.Nullable Integer _return) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -61,7 +61,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Name.java
index 936f3ec7594d..421d86fc3bee 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Name.java
@@ -79,7 +79,7 @@ public Name name(@javax.annotation.Nonnull Integer name) {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -87,7 +87,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -99,7 +99,7 @@ public void setName(@javax.annotation.Nonnull Integer name) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -120,7 +120,7 @@ public Name property(@javax.annotation.Nullable String property) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -128,7 +128,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -140,7 +140,7 @@ public void setProperty(@javax.annotation.Nullable String property) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/NullableClass.java
index a6632dd803f8..f34e4272d1ff 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -128,7 +128,7 @@ public Integer getIntegerProp() {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -162,7 +162,7 @@ public BigDecimal getNumberProp() {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -196,7 +196,7 @@ public Boolean getBooleanProp() {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -230,7 +230,7 @@ public String getStringProp() {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -264,7 +264,7 @@ public LocalDate getDateProp() {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -298,7 +298,7 @@ public OffsetDateTime getDatetimeProp() {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -344,7 +344,7 @@ public List<Object> getArrayNullableProp() {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -390,7 +390,7 @@ public List<Object> getArrayAndItemsNullableProp() {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -426,7 +426,7 @@ public NullableClass addArrayItemsNullableItem(Object arrayItemsNullableItem) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -434,7 +434,7 @@ public List<Object> getArrayItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -470,7 +470,7 @@ public Map<String, Object> getObjectNullableProp() {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -516,7 +516,7 @@ public Map<String, Object> getObjectAndItemsNullableProp() {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -552,7 +552,7 @@ public NullableClass putObjectItemsNullableItem(String key, Object objectItemsNu
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -560,7 +560,7 @@ public Map<String, Object> getObjectItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/NumberOnly.java
index 99d626925883..d675fa2b1f45 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -52,7 +52,7 @@ public NumberOnly justNumber(@javax.annotation.Nullable BigDecimal justNumber) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -60,7 +60,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index a352710b5fe9..7ce3ce9d4a8f 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -71,7 +71,7 @@ public ObjectWithDeprecatedFields uuid(@javax.annotation.Nullable String uuid) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -79,7 +79,7 @@ public String getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -99,7 +99,7 @@ public ObjectWithDeprecatedFields id(@javax.annotation.Nullable BigDecimal id) {
   @Deprecated
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -107,7 +107,7 @@ public BigDecimal getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -127,7 +127,7 @@ public ObjectWithDeprecatedFields deprecatedRef(@javax.annotation.Nullable Depre
   @Deprecated
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -135,7 +135,7 @@ public DeprecatedObject getDeprecatedRef() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -163,7 +163,7 @@ public ObjectWithDeprecatedFields addBarsItem(String barsItem) {
   @Deprecated
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -171,7 +171,7 @@ public List<String> getBars() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Order.java
index 15b992739d51..885e6ae07157 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Order.java
@@ -114,7 +114,7 @@ public Order id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -122,7 +122,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -140,7 +140,7 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -148,7 +148,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -166,7 +166,7 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -174,7 +174,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -192,7 +192,7 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -200,7 +200,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -218,7 +218,7 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "Order Status")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -226,7 +226,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -244,7 +244,7 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -252,7 +252,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/OuterComposite.java
index 5e986616fdf9..c4c09af0f6ad 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -62,7 +62,7 @@ public OuterComposite myNumber(@javax.annotation.Nullable BigDecimal myNumber) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -70,7 +70,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -88,7 +88,7 @@ public OuterComposite myString(@javax.annotation.Nullable String myString) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -96,7 +96,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -114,7 +114,7 @@ public OuterComposite myBoolean(@javax.annotation.Nullable Boolean myBoolean) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -122,7 +122,7 @@ public Boolean getMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 88dd092d08be..e38810695c75 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -52,7 +52,7 @@ public OuterObjectWithEnumProperty value(@javax.annotation.Nonnull OuterEnumInte
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -60,7 +60,7 @@ public OuterEnumInteger getValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@javax.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index ef6689411775..9d0b99669409 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -105,7 +105,7 @@ public ParentWithNullable type(@javax.annotation.Nullable TypeEnum type) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -113,7 +113,7 @@ public TypeEnum getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -137,7 +137,7 @@ public String getNullableProperty() {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Pet.java
index 899b69d7cc26..177ab18f9ae9 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Pet.java
@@ -121,7 +121,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -129,7 +129,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -147,7 +147,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -155,7 +155,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -173,7 +173,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    */
   @javax.annotation.Nonnull
   @Schema(example = "doggie", requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -181,7 +181,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -207,7 +207,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -216,7 +216,7 @@ public Set<String> getPhotoUrls() {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -242,7 +242,7 @@ public Pet addTagsItem(Tag tagsItem) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -250,7 +250,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -268,7 +268,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "pet status in the store")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -276,7 +276,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 27ddac6e50bb..3b6743c0a48c 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -60,7 +60,7 @@ public ReadOnlyFirst(
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -81,7 +81,7 @@ public ReadOnlyFirst baz(@javax.annotation.Nullable String baz) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -89,7 +89,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 38e8046cbc35..a04b124afe70 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -52,7 +52,7 @@ public SpecialModelName() {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -60,7 +60,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Tag.java
index 90f1b852e660..b8a69877b444 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Tag.java
@@ -56,7 +56,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -64,7 +64,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -82,7 +82,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -90,7 +90,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 581d4fdd05ba..32053fe5915b 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -56,7 +56,7 @@ public TestInlineFreeformAdditionalPropertiesRequest someProperty(@javax.annotat
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -64,7 +64,7 @@ public String getSomeProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/User.java
index 2c61e09279b4..c71723cd2997 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/User.java
@@ -86,7 +86,7 @@ public User id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -94,7 +94,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -112,7 +112,7 @@ public User username(@javax.annotation.Nullable String username) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -120,7 +120,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -138,7 +138,7 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -146,7 +146,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -164,7 +164,7 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -172,7 +172,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -190,7 +190,7 @@ public User email(@javax.annotation.Nullable String email) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -198,7 +198,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -216,7 +216,7 @@ public User password(@javax.annotation.Nullable String password) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -224,7 +224,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -242,7 +242,7 @@ public User phone(@javax.annotation.Nullable String phone) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -250,7 +250,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -268,7 +268,7 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "User Status")
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -276,7 +276,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index fdc44b60f0f7..a7573de7902c 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -64,7 +64,7 @@ public AdditionalPropertiesClass putMapPropertyItem(String key, String mapProper
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -72,7 +72,7 @@ public Map<String, String> getMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -97,7 +97,7 @@ public AdditionalPropertiesClass putMapOfMapPropertyItem(String key, Map<String,
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -105,7 +105,7 @@ public Map<String, Map<String, String>> getMapOfMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index c86bfacdf4b8..9159beb3fa4c 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -55,7 +55,7 @@ public AllOfWithSingleRef username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -63,7 +63,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -80,7 +80,7 @@ public AllOfWithSingleRef singleRefType(@javax.annotation.Nullable SingleRefType
    * @return singleRefType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -88,7 +88,7 @@ public SingleRefType getSingleRefType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@javax.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Animal.java
index c280ab08fc35..854d8571ac02 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Animal.java
@@ -67,7 +67,7 @@ public Animal className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -75,7 +75,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -92,7 +92,7 @@ public Animal color(@javax.annotation.Nullable String color) {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -100,7 +100,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index ddbdf87f33fd..6bd84bd2af24 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -61,7 +61,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -69,7 +69,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index d68310c80773..f6ec8bd3f5aa 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -61,7 +61,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -69,7 +69,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayTest.java
index 2be4f3a1a5c3..e4f67c8b9fe8 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -71,7 +71,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -79,7 +79,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -104,7 +104,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -112,7 +112,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -137,7 +137,7 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -145,7 +145,7 @@ public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Capitalization.java
index c80a4d3fe9d5..a4b5fca4a065 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -74,7 +74,7 @@ public Capitalization smallCamel(@javax.annotation.Nullable String smallCamel) {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -82,7 +82,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -99,7 +99,7 @@ public Capitalization capitalCamel(@javax.annotation.Nullable String capitalCame
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -107,7 +107,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -124,7 +124,7 @@ public Capitalization smallSnake(@javax.annotation.Nullable String smallSnake) {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -132,7 +132,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -149,7 +149,7 @@ public Capitalization capitalSnake(@javax.annotation.Nullable String capitalSnak
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -157,7 +157,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -174,7 +174,7 @@ public Capitalization scAETHFlowPoints(@javax.annotation.Nullable String scAETHF
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -182,7 +182,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -199,7 +199,7 @@ public Capitalization ATT_NAME(@javax.annotation.Nullable String ATT_NAME) {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -207,7 +207,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Cat.java
index 99c23772ffd0..6bf164358dcf 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Cat.java
@@ -60,7 +60,7 @@ public Cat declawed(@javax.annotation.Nullable Boolean declawed) {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -68,7 +68,7 @@ public Boolean getDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Category.java
index 68c5075d0c7a..9e2efe73e7b8 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Category.java
@@ -54,7 +54,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Category name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index 364e90a3d339..92c7dc31cb75 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -61,7 +61,7 @@ public ChildWithNullable otherProperty(@javax.annotation.Nullable String otherPr
    * @return otherProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -69,7 +69,7 @@ public String getOtherProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@javax.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ClassModel.java
index b0ee79bf0a2c..8bbff8268c14 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -49,7 +49,7 @@ public ClassModel propertyClass(@javax.annotation.Nullable String propertyClass)
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -57,7 +57,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Client.java
index 36b415404a71..b98ab5c2e070 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Client.java
@@ -49,7 +49,7 @@ public Client client(@javax.annotation.Nullable String client) {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -57,7 +57,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 3401d0a58ced..03b3fab5be8b 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -51,7 +51,7 @@ public DeprecatedObject name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -59,7 +59,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Dog.java
index b447af5483e1..a93f2110c63b 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Dog.java
@@ -60,7 +60,7 @@ public Dog breed(@javax.annotation.Nullable String breed) {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -68,7 +68,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumArrays.java
index 6c22fd8c5a45..03edca375b92 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -127,7 +127,7 @@ public EnumArrays justSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbo
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -135,7 +135,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -160,7 +160,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -168,7 +168,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumTest.java
index eca8c5b92932..a1ee88ac3639 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -237,7 +237,7 @@ public EnumTest enumString(@javax.annotation.Nullable EnumStringEnum enumString)
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -245,7 +245,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -262,7 +262,7 @@ public EnumTest enumStringRequired(@javax.annotation.Nonnull EnumStringRequiredE
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -270,7 +270,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -287,7 +287,7 @@ public EnumTest enumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteg
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -295,7 +295,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -312,7 +312,7 @@ public EnumTest enumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber)
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -320,7 +320,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -343,7 +343,7 @@ public OuterEnum getOuterEnum() {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -370,7 +370,7 @@ public EnumTest outerEnumInteger(@javax.annotation.Nullable OuterEnumInteger out
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -378,7 +378,7 @@ public OuterEnumInteger getOuterEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -395,7 +395,7 @@ public EnumTest outerEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaul
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -403,7 +403,7 @@ public OuterEnumDefaultValue getOuterEnumDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -420,7 +420,7 @@ public EnumTest outerEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnu
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -428,7 +428,7 @@ public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 14d27da26818..6165bd0da8c5 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -58,7 +58,7 @@ public FakeBigDecimalMap200Response someId(@javax.annotation.Nullable BigDecimal
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -66,7 +66,7 @@ public BigDecimal getSomeId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -91,7 +91,7 @@ public FakeBigDecimalMap200Response putSomeMapItem(String key, BigDecimal someMa
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -99,7 +99,7 @@ public Map<String, BigDecimal> getSomeMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index a1da5b8ff057..9cfc462d013c 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -58,7 +58,7 @@ public FileSchemaTestClass _file(@javax.annotation.Nullable ModelFile _file) {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -66,7 +66,7 @@ public ModelFile getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -91,7 +91,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -99,7 +99,7 @@ public List<ModelFile> getFiles() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Foo.java
index 463ae01d5cea..4846b6d1ea72 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Foo.java
@@ -49,7 +49,7 @@ public Foo bar(@javax.annotation.Nullable String bar) {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -57,7 +57,7 @@ public String getBar() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 43c21b188db5..1b077747099e 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -51,7 +51,7 @@ public FooGetDefaultResponse string(@javax.annotation.Nullable Foo string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -59,7 +59,7 @@ public Foo getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FormatTest.java
index 8db5e5775e49..5bbcdce25f6a 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -132,7 +132,7 @@ public FormatTest integer(@javax.annotation.Nullable Integer integer) {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -140,7 +140,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -159,7 +159,7 @@ public FormatTest int32(@javax.annotation.Nullable Integer int32) {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -167,7 +167,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -184,7 +184,7 @@ public FormatTest int64(@javax.annotation.Nullable Long int64) {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -192,7 +192,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -211,7 +211,7 @@ public FormatTest number(@javax.annotation.Nonnull BigDecimal number) {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -219,7 +219,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -238,7 +238,7 @@ public FormatTest _float(@javax.annotation.Nullable Float _float) {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -246,7 +246,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -265,7 +265,7 @@ public FormatTest _double(@javax.annotation.Nullable Double _double) {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -273,7 +273,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -290,7 +290,7 @@ public FormatTest decimal(@javax.annotation.Nullable BigDecimal decimal) {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -298,7 +298,7 @@ public BigDecimal getDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -315,7 +315,7 @@ public FormatTest string(@javax.annotation.Nullable String string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -323,7 +323,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -340,7 +340,7 @@ public FormatTest _byte(@javax.annotation.Nonnull byte[] _byte) {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -348,7 +348,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -365,7 +365,7 @@ public FormatTest binary(@javax.annotation.Nullable File binary) {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -373,7 +373,7 @@ public File getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -390,7 +390,7 @@ public FormatTest date(@javax.annotation.Nonnull LocalDate date) {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -398,7 +398,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -415,7 +415,7 @@ public FormatTest dateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -423,7 +423,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -440,7 +440,7 @@ public FormatTest uuid(@javax.annotation.Nullable UUID uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -448,7 +448,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -465,7 +465,7 @@ public FormatTest password(@javax.annotation.Nonnull String password) {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -473,7 +473,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -490,7 +490,7 @@ public FormatTest patternWithDigits(@javax.annotation.Nullable String patternWit
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -498,7 +498,7 @@ public String getPatternWithDigits() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -515,7 +515,7 @@ public FormatTest patternWithDigitsAndDelimiter(@javax.annotation.Nullable Strin
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -523,7 +523,7 @@ public String getPatternWithDigitsAndDelimiter() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 616a44324341..577f3b25610f 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -61,7 +61,7 @@ public HasOnlyReadOnly(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -75,7 +75,7 @@ public String getBar() {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 07881cfbc5f8..c2792ca9686b 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -59,7 +59,7 @@ public String getNullableMessage() {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MapTest.java
index 6b4146cdf59e..b6f977fb6562 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MapTest.java
@@ -109,7 +109,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -117,7 +117,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -142,7 +142,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -150,7 +150,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -175,7 +175,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -183,7 +183,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -208,7 +208,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -216,7 +216,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index f2ecc68966d7..766a3039de0c 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -64,7 +64,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@javax.annotation.Nullab
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -72,7 +72,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -89,7 +89,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@javax.annotation.Nu
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -97,7 +97,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -122,7 +122,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -130,7 +130,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Model200Response.java
index bafffc39584e..a11e27a61fb3 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -55,7 +55,7 @@ public Model200Response name(@javax.annotation.Nullable Integer name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -63,7 +63,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -80,7 +80,7 @@ public Model200Response propertyClass(@javax.annotation.Nullable String property
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -88,7 +88,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index f19581e362d5..de11b6d4d866 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -60,7 +60,7 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -68,7 +68,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -85,7 +85,7 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -93,7 +93,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -110,7 +110,7 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -118,7 +118,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelFile.java
index c5869603b0cd..96c0e48aa4b4 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -50,7 +50,7 @@ public ModelFile sourceURI(@javax.annotation.Nullable String sourceURI) {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -58,7 +58,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelList.java
index 2c483607d79c..e5321f45292b 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelList.java
@@ -50,7 +50,7 @@ public ModelList _123list(@javax.annotation.Nullable String _123list) {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -58,7 +58,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelReturn.java
index 9be47ab8e0bf..48898b8c24d6 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -50,7 +50,7 @@ public ModelReturn _return(@javax.annotation.Nullable Integer _return) {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -58,7 +58,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Name.java
index 8d485dd72e7a..364429426f64 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Name.java
@@ -76,7 +76,7 @@ public Name name(@javax.annotation.Nonnull Integer name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -84,7 +84,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -95,7 +95,7 @@ public void setName(@javax.annotation.Nonnull Integer name) {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -115,7 +115,7 @@ public Name property(@javax.annotation.Nullable String property) {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -123,7 +123,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -134,7 +134,7 @@ public void setProperty(@javax.annotation.Nullable String property) {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NullableClass.java
index 16b8c3e97f40..38c87267332e 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -126,7 +126,7 @@ public Integer getIntegerProp() {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -159,7 +159,7 @@ public BigDecimal getNumberProp() {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -192,7 +192,7 @@ public Boolean getBooleanProp() {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -225,7 +225,7 @@ public String getStringProp() {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -258,7 +258,7 @@ public LocalDate getDateProp() {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -291,7 +291,7 @@ public OffsetDateTime getDatetimeProp() {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -336,7 +336,7 @@ public List<Object> getArrayNullableProp() {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -381,7 +381,7 @@ public List<Object> getArrayAndItemsNullableProp() {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -416,7 +416,7 @@ public NullableClass addArrayItemsNullableItem(Object arrayItemsNullableItem) {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -424,7 +424,7 @@ public List<Object> getArrayItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -459,7 +459,7 @@ public Map<String, Object> getObjectNullableProp() {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -504,7 +504,7 @@ public Map<String, Object> getObjectAndItemsNullableProp() {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -539,7 +539,7 @@ public NullableClass putObjectItemsNullableItem(String key, Object objectItemsNu
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -547,7 +547,7 @@ public Map<String, Object> getObjectItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NumberOnly.java
index 5320c0ba1199..5de3c5578f81 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -50,7 +50,7 @@ public NumberOnly justNumber(@javax.annotation.Nullable BigDecimal justNumber) {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -58,7 +58,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index e8ae8cd2ff93..a973edff1d43 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -69,7 +69,7 @@ public ObjectWithDeprecatedFields uuid(@javax.annotation.Nullable String uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -77,7 +77,7 @@ public String getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -96,7 +96,7 @@ public ObjectWithDeprecatedFields id(@javax.annotation.Nullable BigDecimal id) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -104,7 +104,7 @@ public BigDecimal getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -123,7 +123,7 @@ public ObjectWithDeprecatedFields deprecatedRef(@javax.annotation.Nullable Depre
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -131,7 +131,7 @@ public DeprecatedObject getDeprecatedRef() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -158,7 +158,7 @@ public ObjectWithDeprecatedFields addBarsItem(String barsItem) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -166,7 +166,7 @@ public List<String> getBars() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Order.java
index 1c927825d17e..6828975e3f1d 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Order.java
@@ -112,7 +112,7 @@ public Order id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -120,7 +120,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -137,7 +137,7 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -145,7 +145,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -162,7 +162,7 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -170,7 +170,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -187,7 +187,7 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -195,7 +195,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -212,7 +212,7 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -220,7 +220,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -237,7 +237,7 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -245,7 +245,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterComposite.java
index d8771cd04386..6cb8fc785226 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -60,7 +60,7 @@ public OuterComposite myNumber(@javax.annotation.Nullable BigDecimal myNumber) {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -68,7 +68,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -85,7 +85,7 @@ public OuterComposite myString(@javax.annotation.Nullable String myString) {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -93,7 +93,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -110,7 +110,7 @@ public OuterComposite myBoolean(@javax.annotation.Nullable Boolean myBoolean) {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -118,7 +118,7 @@ public Boolean getMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 5488479ce207..dcabc1b57ead 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -50,7 +50,7 @@ public OuterObjectWithEnumProperty value(@javax.annotation.Nonnull OuterEnumInte
    * @return value
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -58,7 +58,7 @@ public OuterEnumInteger getValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@javax.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index ac4a3d84eac5..6ca568397834 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -103,7 +103,7 @@ public ParentWithNullable type(@javax.annotation.Nullable TypeEnum type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -111,7 +111,7 @@ public TypeEnum getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -134,7 +134,7 @@ public String getNullableProperty() {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Pet.java
index e413a5d946e0..c8b62cb4bd0d 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Pet.java
@@ -119,7 +119,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -127,7 +127,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -144,7 +144,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -152,7 +152,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -169,7 +169,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -177,7 +177,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -202,7 +202,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -211,7 +211,7 @@ public Set<String> getPhotoUrls() {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -236,7 +236,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -244,7 +244,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -261,7 +261,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -269,7 +269,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 67692e6726e2..fc4146eb8770 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -58,7 +58,7 @@ public ReadOnlyFirst(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -78,7 +78,7 @@ public ReadOnlyFirst baz(@javax.annotation.Nullable String baz) {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -86,7 +86,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 16b10bc50579..fa900aef3f54 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -50,7 +50,7 @@ public SpecialModelName() {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -58,7 +58,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Tag.java
index b6aefd1fe91d..199624ca2618 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Tag.java
@@ -54,7 +54,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index d6419a7ed19f..de4a70be1e11 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -54,7 +54,7 @@ public TestInlineFreeformAdditionalPropertiesRequest someProperty(@javax.annotat
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -62,7 +62,7 @@ public String getSomeProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/User.java
index ba33386e72f3..e96f8c20ef9d 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/User.java
@@ -84,7 +84,7 @@ public User id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -92,7 +92,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -109,7 +109,7 @@ public User username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -117,7 +117,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -134,7 +134,7 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -142,7 +142,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -159,7 +159,7 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -167,7 +167,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -184,7 +184,7 @@ public User email(@javax.annotation.Nullable String email) {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -192,7 +192,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -209,7 +209,7 @@ public User password(@javax.annotation.Nullable String password) {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -217,7 +217,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -234,7 +234,7 @@ public User phone(@javax.annotation.Nullable String phone) {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -242,7 +242,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -259,7 +259,7 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -267,7 +267,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index cb275491a142..711daaaebd0e 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -64,7 +64,7 @@ public AdditionalPropertiesClass putMapPropertyItem(String key, String mapProper
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -72,7 +72,7 @@ public Map<String, String> getMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -97,7 +97,7 @@ public AdditionalPropertiesClass putMapOfMapPropertyItem(String key, Map<String,
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -105,7 +105,7 @@ public Map<String, Map<String, String>> getMapOfMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index c86bfacdf4b8..9159beb3fa4c 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -55,7 +55,7 @@ public AllOfWithSingleRef username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -63,7 +63,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -80,7 +80,7 @@ public AllOfWithSingleRef singleRefType(@javax.annotation.Nullable SingleRefType
    * @return singleRefType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -88,7 +88,7 @@ public SingleRefType getSingleRefType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@javax.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Animal.java
index c280ab08fc35..854d8571ac02 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Animal.java
@@ -67,7 +67,7 @@ public Animal className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -75,7 +75,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -92,7 +92,7 @@ public Animal color(@javax.annotation.Nullable String color) {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -100,7 +100,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 081a316f9b19..98b98ed0e8cf 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -61,7 +61,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -69,7 +69,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 1f7deeee1680..ff2992a16b5f 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -61,7 +61,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -69,7 +69,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayTest.java
index 86b6316ee425..f1b979b178bb 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -71,7 +71,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -79,7 +79,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -104,7 +104,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -112,7 +112,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -137,7 +137,7 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -145,7 +145,7 @@ public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Capitalization.java
index c80a4d3fe9d5..a4b5fca4a065 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -74,7 +74,7 @@ public Capitalization smallCamel(@javax.annotation.Nullable String smallCamel) {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -82,7 +82,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -99,7 +99,7 @@ public Capitalization capitalCamel(@javax.annotation.Nullable String capitalCame
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -107,7 +107,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -124,7 +124,7 @@ public Capitalization smallSnake(@javax.annotation.Nullable String smallSnake) {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -132,7 +132,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -149,7 +149,7 @@ public Capitalization capitalSnake(@javax.annotation.Nullable String capitalSnak
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -157,7 +157,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -174,7 +174,7 @@ public Capitalization scAETHFlowPoints(@javax.annotation.Nullable String scAETHF
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -182,7 +182,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -199,7 +199,7 @@ public Capitalization ATT_NAME(@javax.annotation.Nullable String ATT_NAME) {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -207,7 +207,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Cat.java
index 99c23772ffd0..6bf164358dcf 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Cat.java
@@ -60,7 +60,7 @@ public Cat declawed(@javax.annotation.Nullable Boolean declawed) {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -68,7 +68,7 @@ public Boolean getDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Category.java
index 68c5075d0c7a..9e2efe73e7b8 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Category.java
@@ -54,7 +54,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Category name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index 364e90a3d339..92c7dc31cb75 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -61,7 +61,7 @@ public ChildWithNullable otherProperty(@javax.annotation.Nullable String otherPr
    * @return otherProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -69,7 +69,7 @@ public String getOtherProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@javax.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ClassModel.java
index b0ee79bf0a2c..8bbff8268c14 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -49,7 +49,7 @@ public ClassModel propertyClass(@javax.annotation.Nullable String propertyClass)
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -57,7 +57,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Client.java
index 36b415404a71..b98ab5c2e070 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Client.java
@@ -49,7 +49,7 @@ public Client client(@javax.annotation.Nullable String client) {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -57,7 +57,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 3401d0a58ced..03b3fab5be8b 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -51,7 +51,7 @@ public DeprecatedObject name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -59,7 +59,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Dog.java
index b447af5483e1..a93f2110c63b 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Dog.java
@@ -60,7 +60,7 @@ public Dog breed(@javax.annotation.Nullable String breed) {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -68,7 +68,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/EnumArrays.java
index e5917de84136..ba9cb7f0a40b 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -127,7 +127,7 @@ public EnumArrays justSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbo
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -135,7 +135,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -160,7 +160,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -168,7 +168,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/EnumTest.java
index eca8c5b92932..a1ee88ac3639 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -237,7 +237,7 @@ public EnumTest enumString(@javax.annotation.Nullable EnumStringEnum enumString)
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -245,7 +245,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -262,7 +262,7 @@ public EnumTest enumStringRequired(@javax.annotation.Nonnull EnumStringRequiredE
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -270,7 +270,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -287,7 +287,7 @@ public EnumTest enumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteg
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -295,7 +295,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -312,7 +312,7 @@ public EnumTest enumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber)
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -320,7 +320,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -343,7 +343,7 @@ public OuterEnum getOuterEnum() {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -370,7 +370,7 @@ public EnumTest outerEnumInteger(@javax.annotation.Nullable OuterEnumInteger out
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -378,7 +378,7 @@ public OuterEnumInteger getOuterEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -395,7 +395,7 @@ public EnumTest outerEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaul
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -403,7 +403,7 @@ public OuterEnumDefaultValue getOuterEnumDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -420,7 +420,7 @@ public EnumTest outerEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnu
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -428,7 +428,7 @@ public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index bff30aab52d4..6c3f9e22acdb 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -58,7 +58,7 @@ public FakeBigDecimalMap200Response someId(@javax.annotation.Nullable BigDecimal
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -66,7 +66,7 @@ public BigDecimal getSomeId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -91,7 +91,7 @@ public FakeBigDecimalMap200Response putSomeMapItem(String key, BigDecimal someMa
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -99,7 +99,7 @@ public Map<String, BigDecimal> getSomeMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 5556c2323af6..33d3c3318fee 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -58,7 +58,7 @@ public FileSchemaTestClass _file(@javax.annotation.Nullable ModelFile _file) {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -66,7 +66,7 @@ public ModelFile getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -91,7 +91,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -99,7 +99,7 @@ public List<ModelFile> getFiles() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Foo.java
index 463ae01d5cea..4846b6d1ea72 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Foo.java
@@ -49,7 +49,7 @@ public Foo bar(@javax.annotation.Nullable String bar) {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -57,7 +57,7 @@ public String getBar() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 43c21b188db5..1b077747099e 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -51,7 +51,7 @@ public FooGetDefaultResponse string(@javax.annotation.Nullable Foo string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -59,7 +59,7 @@ public Foo getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FormatTest.java
index 8db5e5775e49..5bbcdce25f6a 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -132,7 +132,7 @@ public FormatTest integer(@javax.annotation.Nullable Integer integer) {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -140,7 +140,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -159,7 +159,7 @@ public FormatTest int32(@javax.annotation.Nullable Integer int32) {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -167,7 +167,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -184,7 +184,7 @@ public FormatTest int64(@javax.annotation.Nullable Long int64) {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -192,7 +192,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -211,7 +211,7 @@ public FormatTest number(@javax.annotation.Nonnull BigDecimal number) {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -219,7 +219,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -238,7 +238,7 @@ public FormatTest _float(@javax.annotation.Nullable Float _float) {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -246,7 +246,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -265,7 +265,7 @@ public FormatTest _double(@javax.annotation.Nullable Double _double) {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -273,7 +273,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -290,7 +290,7 @@ public FormatTest decimal(@javax.annotation.Nullable BigDecimal decimal) {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -298,7 +298,7 @@ public BigDecimal getDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -315,7 +315,7 @@ public FormatTest string(@javax.annotation.Nullable String string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -323,7 +323,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -340,7 +340,7 @@ public FormatTest _byte(@javax.annotation.Nonnull byte[] _byte) {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -348,7 +348,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -365,7 +365,7 @@ public FormatTest binary(@javax.annotation.Nullable File binary) {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -373,7 +373,7 @@ public File getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -390,7 +390,7 @@ public FormatTest date(@javax.annotation.Nonnull LocalDate date) {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -398,7 +398,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -415,7 +415,7 @@ public FormatTest dateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -423,7 +423,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -440,7 +440,7 @@ public FormatTest uuid(@javax.annotation.Nullable UUID uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -448,7 +448,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -465,7 +465,7 @@ public FormatTest password(@javax.annotation.Nonnull String password) {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -473,7 +473,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -490,7 +490,7 @@ public FormatTest patternWithDigits(@javax.annotation.Nullable String patternWit
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -498,7 +498,7 @@ public String getPatternWithDigits() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -515,7 +515,7 @@ public FormatTest patternWithDigitsAndDelimiter(@javax.annotation.Nullable Strin
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -523,7 +523,7 @@ public String getPatternWithDigitsAndDelimiter() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 616a44324341..577f3b25610f 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -61,7 +61,7 @@ public HasOnlyReadOnly(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -75,7 +75,7 @@ public String getBar() {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 07881cfbc5f8..c2792ca9686b 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -59,7 +59,7 @@ public String getNullableMessage() {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/MapTest.java
index 46f8502bc9cf..a987adf00006 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/MapTest.java
@@ -109,7 +109,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -117,7 +117,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -142,7 +142,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -150,7 +150,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -175,7 +175,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -183,7 +183,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -208,7 +208,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -216,7 +216,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index f2cda4eef0c9..e3a98b9897ff 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -64,7 +64,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@javax.annotation.Nullab
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -72,7 +72,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -89,7 +89,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@javax.annotation.Nu
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -97,7 +97,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -122,7 +122,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -130,7 +130,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Model200Response.java
index bafffc39584e..a11e27a61fb3 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -55,7 +55,7 @@ public Model200Response name(@javax.annotation.Nullable Integer name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -63,7 +63,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -80,7 +80,7 @@ public Model200Response propertyClass(@javax.annotation.Nullable String property
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -88,7 +88,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index f19581e362d5..de11b6d4d866 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -60,7 +60,7 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -68,7 +68,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -85,7 +85,7 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -93,7 +93,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -110,7 +110,7 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -118,7 +118,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelFile.java
index c5869603b0cd..96c0e48aa4b4 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -50,7 +50,7 @@ public ModelFile sourceURI(@javax.annotation.Nullable String sourceURI) {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -58,7 +58,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelList.java
index 2c483607d79c..e5321f45292b 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelList.java
@@ -50,7 +50,7 @@ public ModelList _123list(@javax.annotation.Nullable String _123list) {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -58,7 +58,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelReturn.java
index 9be47ab8e0bf..48898b8c24d6 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -50,7 +50,7 @@ public ModelReturn _return(@javax.annotation.Nullable Integer _return) {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -58,7 +58,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Name.java
index 8d485dd72e7a..364429426f64 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Name.java
@@ -76,7 +76,7 @@ public Name name(@javax.annotation.Nonnull Integer name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -84,7 +84,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -95,7 +95,7 @@ public void setName(@javax.annotation.Nonnull Integer name) {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -115,7 +115,7 @@ public Name property(@javax.annotation.Nullable String property) {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -123,7 +123,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -134,7 +134,7 @@ public void setProperty(@javax.annotation.Nullable String property) {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/NullableClass.java
index fe298f107ecc..f48920c6aafe 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -126,7 +126,7 @@ public Integer getIntegerProp() {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -159,7 +159,7 @@ public BigDecimal getNumberProp() {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -192,7 +192,7 @@ public Boolean getBooleanProp() {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -225,7 +225,7 @@ public String getStringProp() {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -258,7 +258,7 @@ public LocalDate getDateProp() {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -291,7 +291,7 @@ public OffsetDateTime getDatetimeProp() {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -336,7 +336,7 @@ public List<Object> getArrayNullableProp() {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -381,7 +381,7 @@ public List<Object> getArrayAndItemsNullableProp() {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -416,7 +416,7 @@ public NullableClass addArrayItemsNullableItem(Object arrayItemsNullableItem) {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -424,7 +424,7 @@ public List<Object> getArrayItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -459,7 +459,7 @@ public Map<String, Object> getObjectNullableProp() {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -504,7 +504,7 @@ public Map<String, Object> getObjectAndItemsNullableProp() {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -539,7 +539,7 @@ public NullableClass putObjectItemsNullableItem(String key, Object objectItemsNu
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -547,7 +547,7 @@ public Map<String, Object> getObjectItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/NumberOnly.java
index 5320c0ba1199..5de3c5578f81 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -50,7 +50,7 @@ public NumberOnly justNumber(@javax.annotation.Nullable BigDecimal justNumber) {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -58,7 +58,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 35077ef231f1..ae988a7e7a24 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -69,7 +69,7 @@ public ObjectWithDeprecatedFields uuid(@javax.annotation.Nullable String uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -77,7 +77,7 @@ public String getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -96,7 +96,7 @@ public ObjectWithDeprecatedFields id(@javax.annotation.Nullable BigDecimal id) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -104,7 +104,7 @@ public BigDecimal getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -123,7 +123,7 @@ public ObjectWithDeprecatedFields deprecatedRef(@javax.annotation.Nullable Depre
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -131,7 +131,7 @@ public DeprecatedObject getDeprecatedRef() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -158,7 +158,7 @@ public ObjectWithDeprecatedFields addBarsItem(String barsItem) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -166,7 +166,7 @@ public List<String> getBars() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Order.java
index 1c927825d17e..6828975e3f1d 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Order.java
@@ -112,7 +112,7 @@ public Order id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -120,7 +120,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -137,7 +137,7 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -145,7 +145,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -162,7 +162,7 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -170,7 +170,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -187,7 +187,7 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -195,7 +195,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -212,7 +212,7 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -220,7 +220,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -237,7 +237,7 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -245,7 +245,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/OuterComposite.java
index d8771cd04386..6cb8fc785226 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -60,7 +60,7 @@ public OuterComposite myNumber(@javax.annotation.Nullable BigDecimal myNumber) {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -68,7 +68,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -85,7 +85,7 @@ public OuterComposite myString(@javax.annotation.Nullable String myString) {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -93,7 +93,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -110,7 +110,7 @@ public OuterComposite myBoolean(@javax.annotation.Nullable Boolean myBoolean) {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -118,7 +118,7 @@ public Boolean getMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 5488479ce207..dcabc1b57ead 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -50,7 +50,7 @@ public OuterObjectWithEnumProperty value(@javax.annotation.Nonnull OuterEnumInte
    * @return value
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -58,7 +58,7 @@ public OuterEnumInteger getValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@javax.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index ac4a3d84eac5..6ca568397834 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -103,7 +103,7 @@ public ParentWithNullable type(@javax.annotation.Nullable TypeEnum type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -111,7 +111,7 @@ public TypeEnum getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -134,7 +134,7 @@ public String getNullableProperty() {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Pet.java
index d76b98ba9e57..a71cf7dc83b5 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Pet.java
@@ -119,7 +119,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -127,7 +127,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -144,7 +144,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -152,7 +152,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -169,7 +169,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -177,7 +177,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -202,7 +202,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -211,7 +211,7 @@ public Set<String> getPhotoUrls() {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -236,7 +236,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -244,7 +244,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -261,7 +261,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -269,7 +269,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 67692e6726e2..fc4146eb8770 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -58,7 +58,7 @@ public ReadOnlyFirst(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -78,7 +78,7 @@ public ReadOnlyFirst baz(@javax.annotation.Nullable String baz) {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -86,7 +86,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 16b10bc50579..fa900aef3f54 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -50,7 +50,7 @@ public SpecialModelName() {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -58,7 +58,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Tag.java
index b6aefd1fe91d..199624ca2618 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Tag.java
@@ -54,7 +54,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -62,7 +62,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -79,7 +79,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -87,7 +87,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index d6419a7ed19f..de4a70be1e11 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -54,7 +54,7 @@ public TestInlineFreeformAdditionalPropertiesRequest someProperty(@javax.annotat
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -62,7 +62,7 @@ public String getSomeProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/User.java
index ba33386e72f3..e96f8c20ef9d 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/User.java
@@ -84,7 +84,7 @@ public User id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -92,7 +92,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -109,7 +109,7 @@ public User username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -117,7 +117,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -134,7 +134,7 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -142,7 +142,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -159,7 +159,7 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -167,7 +167,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -184,7 +184,7 @@ public User email(@javax.annotation.Nullable String email) {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -192,7 +192,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -209,7 +209,7 @@ public User password(@javax.annotation.Nullable String password) {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -217,7 +217,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -234,7 +234,7 @@ public User phone(@javax.annotation.Nullable String phone) {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -242,7 +242,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -259,7 +259,7 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -267,7 +267,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/ChildSchema.java b/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/ChildSchema.java
index cac9f0b8d3d9..eea50d1fd6b3 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/ChildSchema.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/ChildSchema.java
@@ -65,7 +65,7 @@ public ChildSchema prop1(@javax.annotation.Nullable String prop1) {
    * @return prop1
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROP1)
+  @JsonProperty(value = JSON_PROPERTY_PROP1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProp1() {
@@ -73,7 +73,7 @@ public String getProp1() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROP1)
+  @JsonProperty(value = JSON_PROPERTY_PROP1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProp1(@javax.annotation.Nullable String prop1) {
     this.prop1 = prop1;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/MySchemaNameCharacters.java b/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/MySchemaNameCharacters.java
index 7e99aaad0bfb..3bbccd807308 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/MySchemaNameCharacters.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/MySchemaNameCharacters.java
@@ -66,7 +66,7 @@ public MySchemaNameCharacters prop2(@javax.annotation.Nullable String prop2) {
    * @return prop2
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROP2)
+  @JsonProperty(value = JSON_PROPERTY_PROP2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProp2() {
@@ -74,7 +74,7 @@ public String getProp2() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROP2)
+  @JsonProperty(value = JSON_PROPERTY_PROP2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProp2(@javax.annotation.Nullable String prop2) {
     this.prop2 = prop2;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/Parent.java b/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/Parent.java
index f779797a9c25..3b5812fad6c6 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/Parent.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/Parent.java
@@ -64,7 +64,7 @@ public Parent objectType(@javax.annotation.Nullable String objectType) {
    * @return objectType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getObjectType() {
@@ -72,7 +72,7 @@ public String getObjectType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectType(@javax.annotation.Nullable String objectType) {
     this.objectType = objectType;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Category.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Category.java
index 1efaa96a6b91..e3494eed4162 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Category.java
@@ -60,7 +60,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -68,7 +68,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -86,7 +86,7 @@ public Category name(@javax.annotation.Nullable String name) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -94,7 +94,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 2cb2f9d1553f..00096b3a0ba5 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -66,7 +66,7 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -74,7 +74,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -92,7 +92,7 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -100,7 +100,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -118,7 +118,7 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -126,7 +126,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Order.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Order.java
index c395167a92b8..38777f879fc1 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Order.java
@@ -118,7 +118,7 @@ public Order id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -126,7 +126,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -144,7 +144,7 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -152,7 +152,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -170,7 +170,7 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -178,7 +178,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -196,7 +196,7 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -204,7 +204,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -222,7 +222,7 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "Order Status")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -230,7 +230,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -248,7 +248,7 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -256,7 +256,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Pet.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Pet.java
index 99af4f2e3e33..f87f20bbc7fa 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Pet.java
@@ -122,7 +122,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -130,7 +130,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -148,7 +148,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -156,7 +156,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -174,7 +174,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(example = "doggie", required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -182,7 +182,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -208,7 +208,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -216,7 +216,7 @@ public List<String> getPhotoUrls() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -242,7 +242,7 @@ public Pet addTagsItem(Tag tagsItem) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -250,7 +250,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -271,7 +271,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
   @Deprecated
   @javax.annotation.Nullable
   @ApiModelProperty(value = "pet status in the store")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -280,7 +280,7 @@ public StatusEnum getStatus() {
 
 
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Tag.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Tag.java
index 6e329abeaf00..747900a1477f 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Tag.java
@@ -60,7 +60,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -68,7 +68,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -86,7 +86,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -94,7 +94,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/User.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/User.java
index cca2b165fed7..92530d631817 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/User.java
@@ -90,7 +90,7 @@ public User id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -98,7 +98,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -116,7 +116,7 @@ public User username(@javax.annotation.Nullable String username) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -124,7 +124,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -142,7 +142,7 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -150,7 +150,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -168,7 +168,7 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -176,7 +176,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -194,7 +194,7 @@ public User email(@javax.annotation.Nullable String email) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -202,7 +202,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -220,7 +220,7 @@ public User password(@javax.annotation.Nullable String password) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -228,7 +228,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -246,7 +246,7 @@ public User phone(@javax.annotation.Nullable String phone) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -254,7 +254,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -272,7 +272,7 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "User Status")
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -280,7 +280,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Category.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Category.java
index 0dd73911e6bc..3d1d2a008109 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Category.java
@@ -59,7 +59,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -67,7 +67,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -85,7 +85,7 @@ public Category name(@javax.annotation.Nullable String name) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -93,7 +93,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 4063008a149f..dc9d7d5a2c84 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -65,7 +65,7 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -73,7 +73,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -91,7 +91,7 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -99,7 +99,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -117,7 +117,7 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -125,7 +125,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Order.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Order.java
index b7d17a1ff9fa..6ab43bd15685 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Order.java
@@ -117,7 +117,7 @@ public Order id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -125,7 +125,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -143,7 +143,7 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -151,7 +151,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -169,7 +169,7 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -177,7 +177,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -195,7 +195,7 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -203,7 +203,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -221,7 +221,7 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "Order Status")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -229,7 +229,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -247,7 +247,7 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -255,7 +255,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Pet.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Pet.java
index 505e2e42e1a6..90e702ac7fd5 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Pet.java
@@ -121,7 +121,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -129,7 +129,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -147,7 +147,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -155,7 +155,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -173,7 +173,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    */
   @javax.annotation.Nonnull
   @Schema(example = "doggie", requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -181,7 +181,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -207,7 +207,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -215,7 +215,7 @@ public List<String> getPhotoUrls() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -241,7 +241,7 @@ public Pet addTagsItem(Tag tagsItem) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -249,7 +249,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -270,7 +270,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
   @Deprecated
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "pet status in the store")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -279,7 +279,7 @@ public StatusEnum getStatus() {
 
 
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Tag.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Tag.java
index 3d12170f0b3b..bfebe491081b 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Tag.java
@@ -59,7 +59,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -67,7 +67,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -85,7 +85,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -93,7 +93,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/User.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/User.java
index 58cb38b18cdb..930d0eee8f2d 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/User.java
@@ -89,7 +89,7 @@ public User id(@javax.annotation.Nullable Long id) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -97,7 +97,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -115,7 +115,7 @@ public User username(@javax.annotation.Nullable String username) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -123,7 +123,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -141,7 +141,7 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -149,7 +149,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -167,7 +167,7 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -175,7 +175,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -193,7 +193,7 @@ public User email(@javax.annotation.Nullable String email) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -201,7 +201,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -219,7 +219,7 @@ public User password(@javax.annotation.Nullable String password) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -227,7 +227,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -245,7 +245,7 @@ public User phone(@javax.annotation.Nullable String phone) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -253,7 +253,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -271,7 +271,7 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "User Status")
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -279,7 +279,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index bf572de7dc8b..b2c3ddb91e55 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -101,7 +101,7 @@ public AdditionalPropertiesClass putMapPropertyItem(String key, String mapProper
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -109,7 +109,7 @@ public Map<String, String> getMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -134,7 +134,7 @@ public AdditionalPropertiesClass putMapOfMapPropertyItem(String key, Map<String,
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -142,7 +142,7 @@ public Map<String, Map<String, String>> getMapOfMapProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
@@ -165,7 +165,7 @@ public Object getAnytype1() {
         return anytype1.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnytype1_JsonNullable() {
@@ -192,7 +192,7 @@ public AdditionalPropertiesClass mapWithUndeclaredPropertiesAnytype1(@javax.anno
    * @return mapWithUndeclaredPropertiesAnytype1
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getMapWithUndeclaredPropertiesAnytype1() {
@@ -200,7 +200,7 @@ public Object getMapWithUndeclaredPropertiesAnytype1() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype1(@javax.annotation.Nullable Object mapWithUndeclaredPropertiesAnytype1) {
     this.mapWithUndeclaredPropertiesAnytype1 = mapWithUndeclaredPropertiesAnytype1;
@@ -217,7 +217,7 @@ public AdditionalPropertiesClass mapWithUndeclaredPropertiesAnytype2(@javax.anno
    * @return mapWithUndeclaredPropertiesAnytype2
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getMapWithUndeclaredPropertiesAnytype2() {
@@ -225,7 +225,7 @@ public Object getMapWithUndeclaredPropertiesAnytype2() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype2(@javax.annotation.Nullable Object mapWithUndeclaredPropertiesAnytype2) {
     this.mapWithUndeclaredPropertiesAnytype2 = mapWithUndeclaredPropertiesAnytype2;
@@ -250,7 +250,7 @@ public AdditionalPropertiesClass putMapWithUndeclaredPropertiesAnytype3Item(Stri
    * @return mapWithUndeclaredPropertiesAnytype3
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getMapWithUndeclaredPropertiesAnytype3() {
@@ -258,7 +258,7 @@ public Map<String, Object> getMapWithUndeclaredPropertiesAnytype3() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype3(@javax.annotation.Nullable Map<String, Object> mapWithUndeclaredPropertiesAnytype3) {
     this.mapWithUndeclaredPropertiesAnytype3 = mapWithUndeclaredPropertiesAnytype3;
@@ -275,7 +275,7 @@ public AdditionalPropertiesClass emptyMap(@javax.annotation.Nullable Object empt
    * @return emptyMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMPTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_EMPTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getEmptyMap() {
@@ -283,7 +283,7 @@ public Object getEmptyMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMPTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_EMPTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmptyMap(@javax.annotation.Nullable Object emptyMap) {
     this.emptyMap = emptyMap;
@@ -308,7 +308,7 @@ public AdditionalPropertiesClass putMapWithUndeclaredPropertiesStringItem(String
    * @return mapWithUndeclaredPropertiesString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapWithUndeclaredPropertiesString() {
@@ -316,7 +316,7 @@ public Map<String, String> getMapWithUndeclaredPropertiesString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesString(@javax.annotation.Nullable Map<String, String> mapWithUndeclaredPropertiesString) {
     this.mapWithUndeclaredPropertiesString = mapWithUndeclaredPropertiesString;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Animal.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Animal.java
index 1711795f4a07..e96de54900e0 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Animal.java
@@ -71,7 +71,7 @@ public Animal className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -79,7 +79,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -96,7 +96,7 @@ public Animal color(@javax.annotation.Nullable String color) {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -104,7 +104,7 @@ public String getColor() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Apple.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Apple.java
index 4851eb69bdd2..ef16ea3cdbe4 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Apple.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Apple.java
@@ -59,7 +59,7 @@ public Apple cultivar(@javax.annotation.Nullable String cultivar) {
    * @return cultivar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCultivar() {
@@ -67,7 +67,7 @@ public String getCultivar() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCultivar(@javax.annotation.Nullable String cultivar) {
     this.cultivar = cultivar;
@@ -84,7 +84,7 @@ public Apple origin(@javax.annotation.Nullable String origin) {
    * @return origin
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ORIGIN)
+  @JsonProperty(value = JSON_PROPERTY_ORIGIN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOrigin() {
@@ -92,7 +92,7 @@ public String getOrigin() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ORIGIN)
+  @JsonProperty(value = JSON_PROPERTY_ORIGIN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOrigin(@javax.annotation.Nullable String origin) {
     this.origin = origin;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AppleReq.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AppleReq.java
index 96d8487b83d0..af6fc5580f90 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AppleReq.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AppleReq.java
@@ -59,7 +59,7 @@ public AppleReq cultivar(@javax.annotation.Nonnull String cultivar) {
    * @return cultivar
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getCultivar() {
@@ -67,7 +67,7 @@ public String getCultivar() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setCultivar(@javax.annotation.Nonnull String cultivar) {
     this.cultivar = cultivar;
@@ -84,7 +84,7 @@ public AppleReq mealy(@javax.annotation.Nullable Boolean mealy) {
    * @return mealy
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MEALY)
+  @JsonProperty(value = JSON_PROPERTY_MEALY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMealy() {
@@ -92,7 +92,7 @@ public Boolean getMealy() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MEALY)
+  @JsonProperty(value = JSON_PROPERTY_MEALY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMealy(@javax.annotation.Nullable Boolean mealy) {
     this.mealy = mealy;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index feb4a08e0dae..da399b6d0e0b 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -64,7 +64,7 @@ public ArrayOfArrayOfNumberOnly addArrayArrayNumberItem(List<BigDecimal> arrayAr
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -72,7 +72,7 @@ public List<List<BigDecimal>> getArrayArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 2373bdb25573..6849db0e043f 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -64,7 +64,7 @@ public ArrayOfNumberOnly addArrayNumberItem(BigDecimal arrayNumberItem) {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -72,7 +72,7 @@ public List<BigDecimal> getArrayNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayTest.java
index 0c8231beefbb..353421338dbd 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -74,7 +74,7 @@ public ArrayTest addArrayOfStringItem(String arrayOfStringItem) {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -82,7 +82,7 @@ public List<String> getArrayOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -107,7 +107,7 @@ public ArrayTest addArrayArrayOfIntegerItem(List<Long> arrayArrayOfIntegerItem)
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -115,7 +115,7 @@ public List<List<Long>> getArrayArrayOfInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -140,7 +140,7 @@ public ArrayTest addArrayArrayOfModelItem(List<ReadOnlyFirst> arrayArrayOfModelI
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -148,7 +148,7 @@ public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Banana.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Banana.java
index 8836bd274ffa..6e095e5204dc 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Banana.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Banana.java
@@ -55,7 +55,7 @@ public Banana lengthCm(@javax.annotation.Nullable BigDecimal lengthCm) {
    * @return lengthCm
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getLengthCm() {
@@ -63,7 +63,7 @@ public BigDecimal getLengthCm() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLengthCm(@javax.annotation.Nullable BigDecimal lengthCm) {
     this.lengthCm = lengthCm;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BananaReq.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BananaReq.java
index afcf1039cf11..b38bbf20df74 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BananaReq.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BananaReq.java
@@ -60,7 +60,7 @@ public BananaReq lengthCm(@javax.annotation.Nonnull BigDecimal lengthCm) {
    * @return lengthCm
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getLengthCm() {
@@ -68,7 +68,7 @@ public BigDecimal getLengthCm() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setLengthCm(@javax.annotation.Nonnull BigDecimal lengthCm) {
     this.lengthCm = lengthCm;
@@ -85,7 +85,7 @@ public BananaReq sweet(@javax.annotation.Nullable Boolean sweet) {
    * @return sweet
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SWEET)
+  @JsonProperty(value = JSON_PROPERTY_SWEET, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getSweet() {
@@ -93,7 +93,7 @@ public Boolean getSweet() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SWEET)
+  @JsonProperty(value = JSON_PROPERTY_SWEET, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSweet(@javax.annotation.Nullable Boolean sweet) {
     this.sweet = sweet;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BasquePig.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BasquePig.java
index 94494c919ac8..d940919779d7 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BasquePig.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BasquePig.java
@@ -53,7 +53,7 @@ public BasquePig className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -61,7 +61,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Capitalization.java
index b89b1c4eaa1b..25686fd39235 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -78,7 +78,7 @@ public Capitalization smallCamel(@javax.annotation.Nullable String smallCamel) {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -86,7 +86,7 @@ public String getSmallCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -103,7 +103,7 @@ public Capitalization capitalCamel(@javax.annotation.Nullable String capitalCame
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -111,7 +111,7 @@ public String getCapitalCamel() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -128,7 +128,7 @@ public Capitalization smallSnake(@javax.annotation.Nullable String smallSnake) {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -136,7 +136,7 @@ public String getSmallSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -153,7 +153,7 @@ public Capitalization capitalSnake(@javax.annotation.Nullable String capitalSnak
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -161,7 +161,7 @@ public String getCapitalSnake() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -178,7 +178,7 @@ public Capitalization scAETHFlowPoints(@javax.annotation.Nullable String scAETHF
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -186,7 +186,7 @@ public String getScAETHFlowPoints() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -203,7 +203,7 @@ public Capitalization ATT_NAME(@javax.annotation.Nullable String ATT_NAME) {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -211,7 +211,7 @@ public String getATTNAME() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Cat.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Cat.java
index 7d55d47c4c06..32ab4aa99588 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Cat.java
@@ -68,7 +68,7 @@ public Cat declawed(@javax.annotation.Nullable Boolean declawed) {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -76,7 +76,7 @@ public Boolean getDeclawed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Category.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Category.java
index 99dbcd6b8e61..f56c9c236707 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Category.java
@@ -58,7 +58,7 @@ public Category id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -66,7 +66,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -83,7 +83,7 @@ public Category name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -91,7 +91,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ChildCat.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ChildCat.java
index 1da24ccbd0c0..b65a2c26d169 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ChildCat.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ChildCat.java
@@ -74,7 +74,7 @@ public ChildCat name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -82,7 +82,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
@@ -107,7 +107,7 @@ public ChildCat petType(@javax.annotation.Nullable String petType) {
    * @return petType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPetType() {
@@ -115,7 +115,7 @@ public String getPetType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetType(@javax.annotation.Nullable String petType) {
     if (!PET_TYPE_VALUES.contains(petType)) {
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ClassModel.java
index 9a896c1ab2ec..42a8632bf4d8 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -53,7 +53,7 @@ public ClassModel propertyClass(@javax.annotation.Nullable String propertyClass)
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -61,7 +61,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Client.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Client.java
index 1551d58a18fd..f13962270b04 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Client.java
@@ -53,7 +53,7 @@ public Client client(@javax.annotation.Nullable String client) {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -61,7 +61,7 @@ public String getClient() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
index 94ec4c3e0dd8..acac2c3882ca 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
@@ -62,7 +62,7 @@ public ComplexQuadrilateral shapeType(@javax.annotation.Nonnull String shapeType
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -70,7 +70,7 @@ public String getShapeType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -87,7 +87,7 @@ public ComplexQuadrilateral quadrilateralType(@javax.annotation.Nonnull String q
    * @return quadrilateralType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getQuadrilateralType() {
@@ -95,7 +95,7 @@ public String getQuadrilateralType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@javax.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/DanishPig.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/DanishPig.java
index facb225e795a..b71a823d3a45 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/DanishPig.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/DanishPig.java
@@ -53,7 +53,7 @@ public DanishPig className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -61,7 +61,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 0aed1fe812ba..cdf85acfd8c1 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -55,7 +55,7 @@ public DeprecatedObject name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -63,7 +63,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Dog.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Dog.java
index 277e01974853..30d21963b254 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Dog.java
@@ -67,7 +67,7 @@ public Dog breed(@javax.annotation.Nullable String breed) {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -75,7 +75,7 @@ public String getBreed() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Drawing.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Drawing.java
index 5899ee0b9afb..cf4f6a92d195 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Drawing.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Drawing.java
@@ -80,7 +80,7 @@ public Drawing mainShape(@javax.annotation.Nullable Shape mainShape) {
    * @return mainShape
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAIN_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_MAIN_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Shape getMainShape() {
@@ -88,7 +88,7 @@ public Shape getMainShape() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAIN_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_MAIN_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMainShape(@javax.annotation.Nullable Shape mainShape) {
     this.mainShape = mainShape;
@@ -111,7 +111,7 @@ public ShapeOrNull getShapeOrNull() {
         return shapeOrNull.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_OR_NULL)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_OR_NULL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<ShapeOrNull> getShapeOrNull_JsonNullable() {
@@ -144,7 +144,7 @@ public NullableShape getNullableShape() {
         return nullableShape.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<NullableShape> getNullableShape_JsonNullable() {
@@ -179,7 +179,7 @@ public Drawing addShapesItem(Shape shapesItem) {
    * @return shapes
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHAPES)
+  @JsonProperty(value = JSON_PROPERTY_SHAPES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Shape> getShapes() {
@@ -187,7 +187,7 @@ public List<Shape> getShapes() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPES)
+  @JsonProperty(value = JSON_PROPERTY_SHAPES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShapes(@javax.annotation.Nullable List<Shape> shapes) {
     this.shapes = shapes;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumArrays.java
index 0d6bec95c7ef..b00f1405ac42 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -130,7 +130,7 @@ public EnumArrays justSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbo
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -138,7 +138,7 @@ public JustSymbolEnum getJustSymbol() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -163,7 +163,7 @@ public EnumArrays addArrayEnumItem(ArrayEnumEnum arrayEnumItem) {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -171,7 +171,7 @@ public List<ArrayEnumEnum> getArrayEnum() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumTest.java
index 381ddcc06cfe..82c10e220e64 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -280,7 +280,7 @@ public EnumTest enumString(@javax.annotation.Nullable EnumStringEnum enumString)
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -288,7 +288,7 @@ public EnumStringEnum getEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -305,7 +305,7 @@ public EnumTest enumStringRequired(@javax.annotation.Nonnull EnumStringRequiredE
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -313,7 +313,7 @@ public EnumStringRequiredEnum getEnumStringRequired() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -330,7 +330,7 @@ public EnumTest enumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteg
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -338,7 +338,7 @@ public EnumIntegerEnum getEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -355,7 +355,7 @@ public EnumTest enumIntegerOnly(@javax.annotation.Nullable EnumIntegerOnlyEnum e
    * @return enumIntegerOnly
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER_ONLY)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER_ONLY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerOnlyEnum getEnumIntegerOnly() {
@@ -363,7 +363,7 @@ public EnumIntegerOnlyEnum getEnumIntegerOnly() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER_ONLY)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER_ONLY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumIntegerOnly(@javax.annotation.Nullable EnumIntegerOnlyEnum enumIntegerOnly) {
     this.enumIntegerOnly = enumIntegerOnly;
@@ -380,7 +380,7 @@ public EnumTest enumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber)
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -388,7 +388,7 @@ public EnumNumberEnum getEnumNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -411,7 +411,7 @@ public OuterEnum getOuterEnum() {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -438,7 +438,7 @@ public EnumTest outerEnumInteger(@javax.annotation.Nullable OuterEnumInteger out
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -446,7 +446,7 @@ public OuterEnumInteger getOuterEnumInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -463,7 +463,7 @@ public EnumTest outerEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaul
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -471,7 +471,7 @@ public OuterEnumDefaultValue getOuterEnumDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -488,7 +488,7 @@ public EnumTest outerEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnu
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -496,7 +496,7 @@ public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EquilateralTriangle.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
index b8d65bed7ee0..8c3af8f9b634 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
@@ -62,7 +62,7 @@ public EquilateralTriangle shapeType(@javax.annotation.Nonnull String shapeType)
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -70,7 +70,7 @@ public String getShapeType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -87,7 +87,7 @@ public EquilateralTriangle triangleType(@javax.annotation.Nonnull String triangl
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getTriangleType() {
@@ -95,7 +95,7 @@ public String getTriangleType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 077db931248e..9e1c04700815 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -61,7 +61,7 @@ public FileSchemaTestClass _file(@javax.annotation.Nullable ModelFile _file) {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -69,7 +69,7 @@ public ModelFile getFile() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -94,7 +94,7 @@ public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -102,7 +102,7 @@ public List<ModelFile> getFiles() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Foo.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Foo.java
index b7260018dc49..8ff07fe3ee61 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Foo.java
@@ -53,7 +53,7 @@ public Foo bar(@javax.annotation.Nullable String bar) {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -61,7 +61,7 @@ public String getBar() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index c46163825953..74da7f77136e 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -55,7 +55,7 @@ public FooGetDefaultResponse string(@javax.annotation.Nullable Foo string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -63,7 +63,7 @@ public Foo getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FormatTest.java
index f562f7f131b7..856ee4b25366 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -136,7 +136,7 @@ public FormatTest integer(@javax.annotation.Nullable Integer integer) {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -144,7 +144,7 @@ public Integer getInteger() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -163,7 +163,7 @@ public FormatTest int32(@javax.annotation.Nullable Integer int32) {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -171,7 +171,7 @@ public Integer getInt32() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -188,7 +188,7 @@ public FormatTest int64(@javax.annotation.Nullable Long int64) {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -196,7 +196,7 @@ public Long getInt64() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -215,7 +215,7 @@ public FormatTest number(@javax.annotation.Nonnull BigDecimal number) {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -223,7 +223,7 @@ public BigDecimal getNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -242,7 +242,7 @@ public FormatTest _float(@javax.annotation.Nullable Float _float) {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -250,7 +250,7 @@ public Float getFloat() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -269,7 +269,7 @@ public FormatTest _double(@javax.annotation.Nullable Double _double) {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -277,7 +277,7 @@ public Double getDouble() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -294,7 +294,7 @@ public FormatTest decimal(@javax.annotation.Nullable BigDecimal decimal) {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -302,7 +302,7 @@ public BigDecimal getDecimal() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -319,7 +319,7 @@ public FormatTest string(@javax.annotation.Nullable String string) {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -327,7 +327,7 @@ public String getString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -344,7 +344,7 @@ public FormatTest _byte(@javax.annotation.Nonnull byte[] _byte) {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -352,7 +352,7 @@ public byte[] getByte() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -369,7 +369,7 @@ public FormatTest binary(@javax.annotation.Nullable File binary) {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -377,7 +377,7 @@ public File getBinary() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -394,7 +394,7 @@ public FormatTest date(@javax.annotation.Nonnull LocalDate date) {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -402,7 +402,7 @@ public LocalDate getDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -419,7 +419,7 @@ public FormatTest dateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -427,7 +427,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -444,7 +444,7 @@ public FormatTest uuid(@javax.annotation.Nullable UUID uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -452,7 +452,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -469,7 +469,7 @@ public FormatTest password(@javax.annotation.Nonnull String password) {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -477,7 +477,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -494,7 +494,7 @@ public FormatTest patternWithDigits(@javax.annotation.Nullable String patternWit
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -502,7 +502,7 @@ public String getPatternWithDigits() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -519,7 +519,7 @@ public FormatTest patternWithDigitsAndDelimiter(@javax.annotation.Nullable Strin
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -527,7 +527,7 @@ public String getPatternWithDigitsAndDelimiter() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/GrandparentAnimal.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
index f6b8fa19ee4d..d066005fb403 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
@@ -66,7 +66,7 @@ public GrandparentAnimal petType(@javax.annotation.Nonnull String petType) {
    * @return petType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPetType() {
@@ -74,7 +74,7 @@ public String getPetType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPetType(@javax.annotation.Nonnull String petType) {
     this.petType = petType;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 4ff9644c2645..81bbd03244cb 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -64,7 +64,7 @@ public HasOnlyReadOnly(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -79,7 +79,7 @@ public String getBar() {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 25e8d959ea40..c16a435942ec 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -62,7 +62,7 @@ public String getNullableMessage() {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
index 019aac26ae7e..773cc4753b41 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
@@ -58,7 +58,7 @@ public IsoscelesTriangle shapeType(@javax.annotation.Nonnull String shapeType) {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -66,7 +66,7 @@ public String getShapeType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -83,7 +83,7 @@ public IsoscelesTriangle triangleType(@javax.annotation.Nonnull String triangleT
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getTriangleType() {
@@ -91,7 +91,7 @@ public String getTriangleType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MapTest.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MapTest.java
index ebdd881ece8a..b62b4bfea3e0 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MapTest.java
@@ -113,7 +113,7 @@ public MapTest putMapMapOfStringItem(String key, Map<String, String> mapMapOfStr
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -121,7 +121,7 @@ public Map<String, Map<String, String>> getMapMapOfString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -146,7 +146,7 @@ public MapTest putMapOfEnumStringItem(String key, InnerEnum mapOfEnumStringItem)
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -154,7 +154,7 @@ public Map<String, InnerEnum> getMapOfEnumString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -179,7 +179,7 @@ public MapTest putDirectMapItem(String key, Boolean directMapItem) {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -187,7 +187,7 @@ public Map<String, Boolean> getDirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -212,7 +212,7 @@ public MapTest putIndirectMapItem(String key, Boolean indirectMapItem) {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -220,7 +220,7 @@ public Map<String, Boolean> getIndirectMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 1b865b9cbfaf..1d842664b34d 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -68,7 +68,7 @@ public MixedPropertiesAndAdditionalPropertiesClass uuid(@javax.annotation.Nullab
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -76,7 +76,7 @@ public UUID getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -93,7 +93,7 @@ public MixedPropertiesAndAdditionalPropertiesClass dateTime(@javax.annotation.Nu
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -101,7 +101,7 @@ public OffsetDateTime getDateTime() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -126,7 +126,7 @@ public MixedPropertiesAndAdditionalPropertiesClass putMapItem(String key, Animal
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -134,7 +134,7 @@ public Map<String, Animal> getMap() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Model200Response.java
index 451787519c0c..7a01b45d581e 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -59,7 +59,7 @@ public Model200Response name(@javax.annotation.Nullable Integer name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -67,7 +67,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -84,7 +84,7 @@ public Model200Response propertyClass(@javax.annotation.Nullable String property
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -92,7 +92,7 @@ public String getPropertyClass() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index e5c01fc23150..249bd01c88e5 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -64,7 +64,7 @@ public ModelApiResponse code(@javax.annotation.Nullable Integer code) {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -72,7 +72,7 @@ public Integer getCode() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -89,7 +89,7 @@ public ModelApiResponse type(@javax.annotation.Nullable String type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -97,7 +97,7 @@ public String getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -114,7 +114,7 @@ public ModelApiResponse message(@javax.annotation.Nullable String message) {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -122,7 +122,7 @@ public String getMessage() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelFile.java
index 429624d218d8..388ca564e6f4 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -54,7 +54,7 @@ public ModelFile sourceURI(@javax.annotation.Nullable String sourceURI) {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -62,7 +62,7 @@ public String getSourceURI() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelList.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelList.java
index d6b556b0f990..fa41cb6b8dd8 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelList.java
@@ -54,7 +54,7 @@ public ModelList _123list(@javax.annotation.Nullable String _123list) {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -62,7 +62,7 @@ public String get123list() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelReturn.java
index bb90eb857fcd..1266e788d2f4 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -54,7 +54,7 @@ public ModelReturn _return(@javax.annotation.Nullable Integer _return) {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -62,7 +62,7 @@ public Integer getReturn() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Name.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Name.java
index 0686b25f5433..23e683decdc8 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Name.java
@@ -78,7 +78,7 @@ public Name name(@javax.annotation.Nonnull Integer name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -86,7 +86,7 @@ public Integer getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -98,7 +98,7 @@ public void setName(@javax.annotation.Nonnull Integer name) {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -118,7 +118,7 @@ public Name property(@javax.annotation.Nullable String property) {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -126,7 +126,7 @@ public String getProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -138,7 +138,7 @@ public void setProperty(@javax.annotation.Nullable String property) {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NullableClass.java
index 2de6c519b628..66ad30793669 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -119,7 +119,7 @@ public Integer getIntegerProp() {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -152,7 +152,7 @@ public BigDecimal getNumberProp() {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -185,7 +185,7 @@ public Boolean getBooleanProp() {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -218,7 +218,7 @@ public String getStringProp() {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -251,7 +251,7 @@ public LocalDate getDateProp() {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -284,7 +284,7 @@ public OffsetDateTime getDatetimeProp() {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -329,7 +329,7 @@ public List<Object> getArrayNullableProp() {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -374,7 +374,7 @@ public List<Object> getArrayAndItemsNullableProp() {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -409,7 +409,7 @@ public NullableClass addArrayItemsNullableItem(Object arrayItemsNullableItem) {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -417,7 +417,7 @@ public List<Object> getArrayItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -452,7 +452,7 @@ public Map<String, Object> getObjectNullableProp() {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -497,7 +497,7 @@ public Map<String, Object> getObjectAndItemsNullableProp() {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -532,7 +532,7 @@ public NullableClass putObjectItemsNullableItem(String key, Object objectItemsNu
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -540,7 +540,7 @@ public Map<String, Object> getObjectItemsNullable() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NumberOnly.java
index 875690a616f0..ece5b833abc0 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -54,7 +54,7 @@ public NumberOnly justNumber(@javax.annotation.Nullable BigDecimal justNumber) {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -62,7 +62,7 @@ public BigDecimal getJustNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 50f7351f251f..ef57eac59dca 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -75,7 +75,7 @@ public ObjectWithDeprecatedFields uuid(@javax.annotation.Nullable String uuid) {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -83,7 +83,7 @@ public String getUuid() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -103,7 +103,7 @@ public ObjectWithDeprecatedFields id(@javax.annotation.Nullable BigDecimal id) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -112,7 +112,7 @@ public BigDecimal getId() {
 
 
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -132,7 +132,7 @@ public ObjectWithDeprecatedFields deprecatedRef(@javax.annotation.Nullable Depre
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -141,7 +141,7 @@ public DeprecatedObject getDeprecatedRef() {
 
 
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -169,7 +169,7 @@ public ObjectWithDeprecatedFields addBarsItem(String barsItem) {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -178,7 +178,7 @@ public List<String> getBars() {
 
 
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Order.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Order.java
index 6358806cdc9a..aa4397eb480e 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Order.java
@@ -116,7 +116,7 @@ public Order id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -124,7 +124,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -141,7 +141,7 @@ public Order petId(@javax.annotation.Nullable Long petId) {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -149,7 +149,7 @@ public Long getPetId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -166,7 +166,7 @@ public Order quantity(@javax.annotation.Nullable Integer quantity) {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -174,7 +174,7 @@ public Integer getQuantity() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -191,7 +191,7 @@ public Order shipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -199,7 +199,7 @@ public OffsetDateTime getShipDate() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -216,7 +216,7 @@ public Order status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -224,7 +224,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -241,7 +241,7 @@ public Order complete(@javax.annotation.Nullable Boolean complete) {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -249,7 +249,7 @@ public Boolean getComplete() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/OuterComposite.java
index 5460a140352e..0ebef71b6e23 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -64,7 +64,7 @@ public OuterComposite myNumber(@javax.annotation.Nullable BigDecimal myNumber) {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -72,7 +72,7 @@ public BigDecimal getMyNumber() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -89,7 +89,7 @@ public OuterComposite myString(@javax.annotation.Nullable String myString) {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -97,7 +97,7 @@ public String getMyString() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -114,7 +114,7 @@ public OuterComposite myBoolean(@javax.annotation.Nullable Boolean myBoolean) {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -122,7 +122,7 @@ public Boolean getMyBoolean() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Pet.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Pet.java
index 16a903b6a46f..b42708602291 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Pet.java
@@ -119,7 +119,7 @@ public Pet id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -127,7 +127,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -144,7 +144,7 @@ public Pet category(@javax.annotation.Nullable Category category) {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -152,7 +152,7 @@ public Category getCategory() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -169,7 +169,7 @@ public Pet name(@javax.annotation.Nonnull String name) {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -177,7 +177,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -202,7 +202,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -210,7 +210,7 @@ public List<String> getPhotoUrls() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -235,7 +235,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -243,7 +243,7 @@ public List<Tag> getTags() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -260,7 +260,7 @@ public Pet status(@javax.annotation.Nullable StatusEnum status) {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -268,7 +268,7 @@ public StatusEnum getStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
index d5fb200130a9..9186103a8e6c 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
@@ -53,7 +53,7 @@ public QuadrilateralInterface quadrilateralType(@javax.annotation.Nonnull String
    * @return quadrilateralType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getQuadrilateralType() {
@@ -61,7 +61,7 @@ public String getQuadrilateralType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@javax.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 886ae398cbb9..b5542848af95 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -61,7 +61,7 @@ public ReadOnlyFirst(
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -81,7 +81,7 @@ public ReadOnlyFirst baz(@javax.annotation.Nullable String baz) {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -89,7 +89,7 @@ public String getBaz() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ScaleneTriangle.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
index 41608ebae8c0..20dcabb04260 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
@@ -62,7 +62,7 @@ public ScaleneTriangle shapeType(@javax.annotation.Nonnull String shapeType) {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -70,7 +70,7 @@ public String getShapeType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -87,7 +87,7 @@ public ScaleneTriangle triangleType(@javax.annotation.Nonnull String triangleTyp
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getTriangleType() {
@@ -95,7 +95,7 @@ public String getTriangleType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ShapeInterface.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ShapeInterface.java
index 3895b0948f3c..1bad9d0f94b5 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ShapeInterface.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ShapeInterface.java
@@ -53,7 +53,7 @@ public ShapeInterface shapeType(@javax.annotation.Nonnull String shapeType) {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -61,7 +61,7 @@ public String getShapeType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
index 5e97a946c774..4f1d3610b59b 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
@@ -62,7 +62,7 @@ public SimpleQuadrilateral shapeType(@javax.annotation.Nonnull String shapeType)
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -70,7 +70,7 @@ public String getShapeType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -87,7 +87,7 @@ public SimpleQuadrilateral quadrilateralType(@javax.annotation.Nonnull String qu
    * @return quadrilateralType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getQuadrilateralType() {
@@ -95,7 +95,7 @@ public String getQuadrilateralType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@javax.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SpecialModelName.java
index ae07c6cc97e6..78ace4950169 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -59,7 +59,7 @@ public SpecialModelName() {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -67,7 +67,7 @@ public SpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
@@ -84,7 +84,7 @@ public SpecialModelName specialModelName(@javax.annotation.Nullable String speci
    * @return specialModelName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SPECIAL_MODEL_NAME)
+  @JsonProperty(value = JSON_PROPERTY_SPECIAL_MODEL_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSpecialModelName() {
@@ -92,7 +92,7 @@ public String getSpecialModelName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SPECIAL_MODEL_NAME)
+  @JsonProperty(value = JSON_PROPERTY_SPECIAL_MODEL_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSpecialModelName(@javax.annotation.Nullable String specialModelName) {
     this.specialModelName = specialModelName;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Tag.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Tag.java
index 16088fc01723..bbcdb303f4a3 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Tag.java
@@ -58,7 +58,7 @@ public Tag id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -66,7 +66,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -83,7 +83,7 @@ public Tag name(@javax.annotation.Nullable String name) {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -91,7 +91,7 @@ public String getName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 90e79bacf742..b204e3875d84 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -58,7 +58,7 @@ public TestInlineFreeformAdditionalPropertiesRequest someProperty(@javax.annotat
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -66,7 +66,7 @@ public String getSomeProperty() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TriangleInterface.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TriangleInterface.java
index 138e05555e30..531a6f1b26b7 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TriangleInterface.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TriangleInterface.java
@@ -53,7 +53,7 @@ public TriangleInterface triangleType(@javax.annotation.Nonnull String triangleT
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getTriangleType() {
@@ -61,7 +61,7 @@ public String getTriangleType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/User.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/User.java
index 4417d0e7c0ee..c4be8b975194 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/User.java
@@ -109,7 +109,7 @@ public User id(@javax.annotation.Nullable Long id) {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -117,7 +117,7 @@ public Long getId() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -134,7 +134,7 @@ public User username(@javax.annotation.Nullable String username) {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -142,7 +142,7 @@ public String getUsername() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -159,7 +159,7 @@ public User firstName(@javax.annotation.Nullable String firstName) {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -167,7 +167,7 @@ public String getFirstName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -184,7 +184,7 @@ public User lastName(@javax.annotation.Nullable String lastName) {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -192,7 +192,7 @@ public String getLastName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -209,7 +209,7 @@ public User email(@javax.annotation.Nullable String email) {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -217,7 +217,7 @@ public String getEmail() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -234,7 +234,7 @@ public User password(@javax.annotation.Nullable String password) {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -242,7 +242,7 @@ public String getPassword() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -259,7 +259,7 @@ public User phone(@javax.annotation.Nullable String phone) {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -267,7 +267,7 @@ public String getPhone() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -284,7 +284,7 @@ public User userStatus(@javax.annotation.Nullable Integer userStatus) {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -292,7 +292,7 @@ public Integer getUserStatus() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
@@ -309,7 +309,7 @@ public User objectWithNoDeclaredProps(@javax.annotation.Nullable Object objectWi
    * @return objectWithNoDeclaredProps
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getObjectWithNoDeclaredProps() {
@@ -317,7 +317,7 @@ public Object getObjectWithNoDeclaredProps() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectWithNoDeclaredProps(@javax.annotation.Nullable Object objectWithNoDeclaredProps) {
     this.objectWithNoDeclaredProps = objectWithNoDeclaredProps;
@@ -340,7 +340,7 @@ public Object getObjectWithNoDeclaredPropsNullable() {
         return objectWithNoDeclaredPropsNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getObjectWithNoDeclaredPropsNullable_JsonNullable() {
@@ -373,7 +373,7 @@ public Object getAnyTypeProp() {
         return anyTypeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANY_TYPE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ANY_TYPE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnyTypeProp_JsonNullable() {
@@ -406,7 +406,7 @@ public Object getAnyTypePropNullable() {
         return anyTypePropNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANY_TYPE_PROP_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ANY_TYPE_PROP_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnyTypePropNullable_JsonNullable() {
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Whale.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Whale.java
index c18d31c5c197..0e456c9d1a69 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Whale.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Whale.java
@@ -64,7 +64,7 @@ public Whale hasBaleen(@javax.annotation.Nullable Boolean hasBaleen) {
    * @return hasBaleen
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_HAS_BALEEN)
+  @JsonProperty(value = JSON_PROPERTY_HAS_BALEEN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getHasBaleen() {
@@ -72,7 +72,7 @@ public Boolean getHasBaleen() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_HAS_BALEEN)
+  @JsonProperty(value = JSON_PROPERTY_HAS_BALEEN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setHasBaleen(@javax.annotation.Nullable Boolean hasBaleen) {
     this.hasBaleen = hasBaleen;
@@ -89,7 +89,7 @@ public Whale hasTeeth(@javax.annotation.Nullable Boolean hasTeeth) {
    * @return hasTeeth
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_HAS_TEETH)
+  @JsonProperty(value = JSON_PROPERTY_HAS_TEETH, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getHasTeeth() {
@@ -97,7 +97,7 @@ public Boolean getHasTeeth() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_HAS_TEETH)
+  @JsonProperty(value = JSON_PROPERTY_HAS_TEETH, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setHasTeeth(@javax.annotation.Nullable Boolean hasTeeth) {
     this.hasTeeth = hasTeeth;
@@ -114,7 +114,7 @@ public Whale className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -122,7 +122,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Zebra.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Zebra.java
index 7f20f3cce8bc..acf18a698e3f 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Zebra.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Zebra.java
@@ -100,7 +100,7 @@ public Zebra type(@javax.annotation.Nullable TypeEnum type) {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -108,7 +108,7 @@ public TypeEnum getType() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -125,7 +125,7 @@ public Zebra className(@javax.annotation.Nonnull String className) {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -133,7 +133,7 @@ public String getClassName() {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Category.java b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Category.java
index 3132b518447e..36b7539dab3c 100644
--- a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Category.java
+++ b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Category.java
@@ -44,7 +44,7 @@ public class Category  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -53,7 +53,7 @@ public Long getId() {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -68,7 +68,7 @@ public Category id(Long id) {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
@@ -77,7 +77,7 @@ public String getName() {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(String name) {
     this.name = name;
diff --git a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/ModelApiResponse.java b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/ModelApiResponse.java
index 4796b0ec36e5..15795e5234fb 100644
--- a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/ModelApiResponse.java
+++ b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/ModelApiResponse.java
@@ -50,7 +50,7 @@ public class ModelApiResponse  {
    * Get code
    * @return code
    **/
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getCode() {
     return code;
@@ -59,7 +59,7 @@ public Integer getCode() {
   /**
    * Set code
    */
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(Integer code) {
     this.code = code;
@@ -74,7 +74,7 @@ public ModelApiResponse code(Integer code) {
    * Get type
    * @return type
    **/
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getType() {
     return type;
@@ -83,7 +83,7 @@ public String getType() {
   /**
    * Set type
    */
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(String type) {
     this.type = type;
@@ -98,7 +98,7 @@ public ModelApiResponse type(String type) {
    * Get message
    * @return message
    **/
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getMessage() {
     return message;
@@ -107,7 +107,7 @@ public String getMessage() {
   /**
    * Set message
    */
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(String message) {
     this.message = message;
diff --git a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Order.java b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Order.java
index 31031beb5379..565b090bbfc4 100644
--- a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Order.java
+++ b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Order.java
@@ -100,7 +100,7 @@ public static StatusEnum fromValue(String value) {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -109,7 +109,7 @@ public Long getId() {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -124,7 +124,7 @@ public Order id(Long id) {
    * Get petId
    * @return petId
    **/
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getPetId() {
     return petId;
@@ -133,7 +133,7 @@ public Long getPetId() {
   /**
    * Set petId
    */
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(Long petId) {
     this.petId = petId;
@@ -148,7 +148,7 @@ public Order petId(Long petId) {
    * Get quantity
    * @return quantity
    **/
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getQuantity() {
     return quantity;
@@ -157,7 +157,7 @@ public Integer getQuantity() {
   /**
    * Set quantity
    */
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(Integer quantity) {
     this.quantity = quantity;
@@ -172,7 +172,7 @@ public Order quantity(Integer quantity) {
    * Get shipDate
    * @return shipDate
    **/
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Date getShipDate() {
     return shipDate;
@@ -181,7 +181,7 @@ public Date getShipDate() {
   /**
    * Set shipDate
    */
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(Date shipDate) {
     this.shipDate = shipDate;
@@ -196,7 +196,7 @@ public Order shipDate(Date shipDate) {
    * Order Status
    * @return status
    **/
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
@@ -205,7 +205,7 @@ public StatusEnum getStatus() {
   /**
    * Set status
    */
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(StatusEnum status) {
     this.status = status;
@@ -220,7 +220,7 @@ public Order status(StatusEnum status) {
    * Get complete
    * @return complete
    **/
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getComplete() {
     return complete;
@@ -229,7 +229,7 @@ public Boolean getComplete() {
   /**
    * Set complete
    */
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(Boolean complete) {
     this.complete = complete;
diff --git a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Pet.java b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Pet.java
index d1e447e3d9cd..949cb15845b7 100644
--- a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Pet.java
+++ b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Pet.java
@@ -104,7 +104,7 @@ public static StatusEnum fromValue(String value) {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -113,7 +113,7 @@ public Long getId() {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -128,7 +128,7 @@ public Pet id(Long id) {
    * Get category
    * @return category
    **/
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Category getCategory() {
     return category;
@@ -137,7 +137,7 @@ public Category getCategory() {
   /**
    * Set category
    */
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(Category category) {
     this.category = category;
@@ -152,7 +152,7 @@ public Pet category(Category category) {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getName() {
     return name;
@@ -161,7 +161,7 @@ public String getName() {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(String name) {
     this.name = name;
@@ -176,7 +176,7 @@ public Pet name(String name) {
    * Get photoUrls
    * @return photoUrls
    **/
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public List<String> getPhotoUrls() {
     return photoUrls;
@@ -185,7 +185,7 @@ public List<String> getPhotoUrls() {
   /**
    * Set photoUrls
    */
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -208,7 +208,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
    * Get tags
    * @return tags
    **/
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Tag> getTags() {
     return tags;
@@ -217,7 +217,7 @@ public List<Tag> getTags() {
   /**
    * Set tags
    */
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(List<Tag> tags) {
     this.tags = tags;
@@ -242,7 +242,7 @@ public Pet addTagsItem(Tag tagsItem) {
    * @deprecated
    **/
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
@@ -251,7 +251,7 @@ public StatusEnum getStatus() {
   /**
    * Set status
    */
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(StatusEnum status) {
     this.status = status;
diff --git a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Tag.java b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Tag.java
index c78aac97c6cc..2e9b77d167eb 100644
--- a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Tag.java
+++ b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Tag.java
@@ -44,7 +44,7 @@ public class Tag  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -53,7 +53,7 @@ public Long getId() {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -68,7 +68,7 @@ public Tag id(Long id) {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
@@ -77,7 +77,7 @@ public String getName() {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(String name) {
     this.name = name;
diff --git a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/User.java b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/User.java
index 7bd29b222e4e..a4fb319c8a81 100644
--- a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/User.java
+++ b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/User.java
@@ -77,7 +77,7 @@ public class User  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -86,7 +86,7 @@ public Long getId() {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -101,7 +101,7 @@ public User id(Long id) {
    * Get username
    * @return username
    **/
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getUsername() {
     return username;
@@ -110,7 +110,7 @@ public String getUsername() {
   /**
    * Set username
    */
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(String username) {
     this.username = username;
@@ -125,7 +125,7 @@ public User username(String username) {
    * Get firstName
    * @return firstName
    **/
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getFirstName() {
     return firstName;
@@ -134,7 +134,7 @@ public String getFirstName() {
   /**
    * Set firstName
    */
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(String firstName) {
     this.firstName = firstName;
@@ -149,7 +149,7 @@ public User firstName(String firstName) {
    * Get lastName
    * @return lastName
    **/
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getLastName() {
     return lastName;
@@ -158,7 +158,7 @@ public String getLastName() {
   /**
    * Set lastName
    */
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(String lastName) {
     this.lastName = lastName;
@@ -173,7 +173,7 @@ public User lastName(String lastName) {
    * Get email
    * @return email
    **/
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getEmail() {
     return email;
@@ -182,7 +182,7 @@ public String getEmail() {
   /**
    * Set email
    */
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(String email) {
     this.email = email;
@@ -197,7 +197,7 @@ public User email(String email) {
    * Get password
    * @return password
    **/
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPassword() {
     return password;
@@ -206,7 +206,7 @@ public String getPassword() {
   /**
    * Set password
    */
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(String password) {
     this.password = password;
@@ -221,7 +221,7 @@ public User password(String password) {
    * Get phone
    * @return phone
    **/
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPhone() {
     return phone;
@@ -230,7 +230,7 @@ public String getPhone() {
   /**
    * Set phone
    */
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(String phone) {
     this.phone = phone;
@@ -245,7 +245,7 @@ public User phone(String phone) {
    * User Status
    * @return userStatus
    **/
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getUserStatus() {
     return userStatus;
@@ -254,7 +254,7 @@ public Integer getUserStatus() {
   /**
    * Set userStatus
    */
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(Integer userStatus) {
     this.userStatus = userStatus;