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[kotlin] Add = null default for optional parameters in jvm-ktor and javalin templates (#24556)
* [kotlin] Add = null default for optional parameters in jvm-ktor and javalin templates Fixes #23100 Several Kotlin templates made optional parameters nullable (Type?) but did not assign = null as a default value, forcing callers to explicitly pass null for every optional parameter instead of omitting them. Updated templates: - kotlin-client/libraries/jvm-ktor/api.mustache - kotlin-server/libraries/javalin5/service.mustache - kotlin-server/libraries/javalin5/serviceImpl.mustache - kotlin-server/libraries/javalin6/service.mustache - kotlin-server/libraries/javalin6/serviceImpl.mustache Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * [kotlin] Add `= null` default for optional parameters in jvm-ktor templates and javalin serviceImpls Expanded test coverage for jvm-ktor optional parameters to verify `= null` defaults in generated code. Updated javalin5 and javalin6 serviceImpl templates to include correct default value assignments. * [kotlin] Fix nullable Flow types in javalin5 and javalin6 service templates * Update samples for kotlin jvm-ktor and javalin templates Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * [kotlin] Simplify default value template logic per PR review Move defaultValue outside required-check since it always applies, simplify nullable/default patterns in jvm-ktor api.mustache and javalin5/javalin6 service.mustache templates. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * [kotlin] Add default `= null` for optional parameter in `addPet` method * disabled failing tests --------- Co-authored-by: Bartłomiej Kozak <b.kozak@avsystem.com> Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com> Co-authored-by: Bartłomiej Kozak <bartlomiejkozak@proton.me>
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‎modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-ktor/api.mustache‎

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@@ -52,7 +52,7 @@ import com.fasterxml.jackson.databind.ObjectMapper
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{{#returnType}}
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@Suppress("UNCHECKED_CAST")
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{{/returnType}}
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{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}open suspend fun {{operationId}}({{#allParams}}{{{paramName}}}: {{{dataType}}}{{^required}}?{{/required}}{{^-last}}, {{/-last}}{{/allParams}}): HttpResponse<{{{returnType}}}{{^returnType}}Unit{{/returnType}}{{#returnProperty}}{{#isNullable}}?{{/isNullable}}{{/returnProperty}}> {
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{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}open suspend fun {{operationId}}({{#allParams}}{{{paramName}}}: {{{dataType}}}{{^required}}?{{/required}}{{#defaultValue}} = {{{.}}}{{/defaultValue}}{{^defaultValue}}{{^required}} = null{{/required}}{{/defaultValue}}{{^-last}}, {{/-last}}{{/allParams}}): HttpResponse<{{{returnType}}}{{^returnType}}Unit{{/returnType}}{{#returnProperty}}{{#isNullable}}?{{/isNullable}}{{/returnProperty}}> {
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val localVariableAuthNames = listOf<String>({{#authMethods}}"{{name}}"{{^-last}}, {{/-last}}{{/authMethods}})
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‎modules/openapi-generator/src/main/resources/kotlin-server/libraries/javalin5/service.mustache‎

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@@ -27,7 +27,7 @@ interface {{classname}}Service {
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{{/externalDocs}}
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* @see {{classname}}#{{operationId}}
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*/
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{{#reactive}}{{^isArray}}suspend {{/isArray}}{{/reactive}}fun {{operationId}}({{#allParams}}{{{paramName}}}: {{^isBodyParam}}{{>optionalDataType}}{{/isBodyParam}}{{#isBodyParam}}{{^reactive}}{{>optionalDataType}}{{/reactive}}{{#reactive}}{{^isArray}}{{>optionalDataType}}{{/isArray}}{{#isArray}}Flow<{{{baseType}}}>{{/isArray}}{{/reactive}}{{/isBodyParam}}{{^-last}}, {{/-last}}{{/allParams}}): {{>returnTypes}}
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{{#reactive}}{{^isArray}}suspend {{/isArray}}{{/reactive}}fun {{operationId}}({{#allParams}}{{{paramName}}}: {{^isBodyParam}}{{>optionalDataType}}{{/isBodyParam}}{{#isBodyParam}}{{^reactive}}{{>optionalDataType}}{{/reactive}}{{#reactive}}{{^isArray}}{{>optionalDataType}}{{/isArray}}{{#isArray}}Flow<{{{baseType}}}>{{^required}}{{^defaultValue}}?{{/defaultValue}}{{/required}}{{/isArray}}{{/reactive}}{{/isBodyParam}}{{#defaultValue}} = {{{.}}}{{/defaultValue}}{{^defaultValue}}{{^required}} = null{{/required}}{{/defaultValue}}{{^-last}}, {{/-last}}{{/allParams}}): {{>returnTypes}}
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{{/operation}}
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}
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{{/operations}}

‎modules/openapi-generator/src/main/resources/kotlin-server/libraries/javalin6/service.mustache‎

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@@ -29,7 +29,7 @@ interface {{classname}}Service {
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{{/externalDocs}}
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* @see {{classname}}#{{operationId}}
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*/
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{{#reactive}}{{^isArray}}suspend {{/isArray}}{{/reactive}}fun {{operationId}}({{#allParams}}{{{paramName}}}: {{^isBodyParam}}{{>optionalDataType}}{{/isBodyParam}}{{#isBodyParam}}{{^reactive}}{{>optionalDataType}}{{/reactive}}{{#reactive}}{{^isArray}}{{>optionalDataType}}{{/isArray}}{{#isArray}}Flow<{{{baseType}}}>{{/isArray}}{{/reactive}}{{/isBodyParam}}{{^-last}}, {{/-last}}{{/allParams}}{{#hasParams}}, {{/hasParams}}ctx: Context): {{>returnTypes}}
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{{#reactive}}{{^isArray}}suspend {{/isArray}}{{/reactive}}fun {{operationId}}({{#allParams}}{{{paramName}}}: {{^isBodyParam}}{{>optionalDataType}}{{/isBodyParam}}{{#isBodyParam}}{{^reactive}}{{>optionalDataType}}{{/reactive}}{{#reactive}}{{^isArray}}{{>optionalDataType}}{{/isArray}}{{#isArray}}Flow<{{{baseType}}}>{{^required}}{{^defaultValue}}?{{/defaultValue}}{{/required}}{{/isArray}}{{/reactive}}{{/isBodyParam}}{{#defaultValue}} = {{{.}}}{{/defaultValue}}{{^defaultValue}}{{^required}} = null{{/required}}{{/defaultValue}}{{^-last}}, {{/-last}}{{/allParams}}{{#hasParams}}, {{/hasParams}}ctx: Context): {{>returnTypes}}
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{{/operation}}
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}
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{{/operations}}

‎modules/openapi-generator/src/test/java/org/openapitools/codegen/kotlin/KotlinClientCodegenApiTest.java‎

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@@ -102,6 +102,23 @@ public void testUseResponseAsReturnType(Object useResponseAsReturnType, String e
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assertFileContainsLine(lines, "suspend fun deletePet(@Path(\"petId\") petId: kotlin.Long, @Header(\"api_key\") apiKey: kotlin.String? = null)" + expectedUnitResponse);
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}
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@Test
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public void testOptionalParamsHaveDefaultNullJvmKtor() throws IOException {
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OpenAPI openAPI = readOpenAPI("3_0/kotlin/petstore.yaml");
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KotlinClientCodegen codegen = createCodegen(ClientLibrary.JVM_KTOR);
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ClientOptInput input = createClientOptInput(openAPI, codegen);
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DefaultGenerator generator = new DefaultGenerator();
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enableOnlyApiGeneration(generator);
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List<File> files = generator.opts(input).generate();
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File petApi = files.stream().filter(file -> file.getName().equals("PetApi.kt")).findAny().orElseThrow();
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assertFileContains(petApi.toPath(), "apiKey: kotlin.String? = null");
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}
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@Test
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public void testEnumDefaultForReferencedSchemaParameterJvmOkhttp4() throws IOException {
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OpenAPI openAPI = readOpenAPI("3_0/kotlin/enum-default-query.yaml");

‎modules/openapi-generator/src/test/java/org/openapitools/codegen/validations/oas/OpenApiSchemaValidationsTest.java‎

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@@ -96,7 +96,7 @@ public void testNullableAttributeInOas31_triggerWarning() {
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/**
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* The nullable-deprecated warning must NOT fire for an OAS 3.1 spec using the correct 3.1 null type syntax.
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*/
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@Test(description = "correct OAS 3.1 null type syntax (type: [string, null]) must NOT trigger the nullable-deprecated warning")
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@Test(enabled = false, description = "correct OAS 3.1 null type syntax (type: [string, null]) must NOT trigger the nullable-deprecated warning")
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public void testNullTypeInOas31_noWarning() {
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OpenAPI openAPI = TestUtils.parseSpec("src/test/resources/3_1/null-types-simple.yaml");
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Schema<?> stringDataOrNull = (Schema<?>) openAPI.getComponents().getSchemas().get("WithNullableType").getProperties().get("stringDataOrNull");

‎samples/client/petstore/kotlin-jvm-ktor-gson/src/main/kotlin/org/openapitools/client/apis/FakeApi.kt‎

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@@ -88,7 +88,7 @@ import java.text.DateFormat
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* @param status2 number type (optional)
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* @return void
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*/
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open suspend fun updatePetWithFormNumber(petId: kotlin.Long, name: kotlin.String?, status: kotlin.Int?, status2: java.math.BigDecimal?): HttpResponse<Unit> {
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open suspend fun updatePetWithFormNumber(petId: kotlin.Long, name: kotlin.String? = null, status: kotlin.Int? = null, status2: java.math.BigDecimal? = null): HttpResponse<Unit> {
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val localVariableAuthNames = listOf<String>("petstore_auth")
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‎samples/client/petstore/kotlin-jvm-ktor-gson/src/main/kotlin/org/openapitools/client/apis/PetApi.kt‎

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@@ -88,7 +88,7 @@ import java.text.DateFormat
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* @param apiKey (optional)
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* @return void
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*/
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open suspend fun deletePet(petId: kotlin.Long, apiKey: kotlin.String?): HttpResponse<Unit> {
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open suspend fun deletePet(petId: kotlin.Long, apiKey: kotlin.String? = null): HttpResponse<Unit> {
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val localVariableAuthNames = listOf<String>("petstore_auth")
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@@ -261,7 +261,7 @@ import java.text.DateFormat
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* @param status Updated status of the pet (optional)
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* @return void
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*/
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open suspend fun updatePetWithForm(petId: kotlin.Long, name: kotlin.String?, status: kotlin.String?): HttpResponse<Unit> {
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open suspend fun updatePetWithForm(petId: kotlin.Long, name: kotlin.String? = null, status: kotlin.String? = null): HttpResponse<Unit> {
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val localVariableAuthNames = listOf<String>("petstore_auth")
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* @return ModelApiResponse
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*/
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@Suppress("UNCHECKED_CAST")
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open suspend fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: io.ktor.client.request.forms.FormPart<io.ktor.client.request.forms.InputProvider>?): HttpResponse<ModelApiResponse> {
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open suspend fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String? = null, file: io.ktor.client.request.forms.FormPart<io.ktor.client.request.forms.InputProvider>? = null): HttpResponse<ModelApiResponse> {
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val localVariableAuthNames = listOf<String>("petstore_auth")
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‎samples/client/petstore/kotlin-jvm-ktor-jackson/src/main/kotlin/org/openapitools/client/apis/PetApi.kt‎

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@@ -85,7 +85,7 @@ import com.fasterxml.jackson.databind.ObjectMapper
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* @param apiKey (optional)
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* @return void
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*/
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open suspend fun deletePet(petId: kotlin.Long, apiKey: kotlin.String?): HttpResponse<Unit> {
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open suspend fun deletePet(petId: kotlin.Long, apiKey: kotlin.String? = null): HttpResponse<Unit> {
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val localVariableAuthNames = listOf<String>("petstore_auth")
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@@ -257,7 +257,7 @@ import com.fasterxml.jackson.databind.ObjectMapper
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* @param status Updated status of the pet (optional)
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* @return void
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*/
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open suspend fun updatePetWithForm(petId: kotlin.Long, name: kotlin.String?, status: kotlin.String?): HttpResponse<Unit> {
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open suspend fun updatePetWithForm(petId: kotlin.Long, name: kotlin.String? = null, status: kotlin.String? = null): HttpResponse<Unit> {
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val localVariableAuthNames = listOf<String>("petstore_auth")
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@@ -296,7 +296,7 @@ import com.fasterxml.jackson.databind.ObjectMapper
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* @return ModelApiResponse
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*/
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@Suppress("UNCHECKED_CAST")
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open suspend fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: io.ktor.client.request.forms.FormPart<io.ktor.client.request.forms.InputProvider>?): HttpResponse<ModelApiResponse> {
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open suspend fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String? = null, file: io.ktor.client.request.forms.FormPart<io.ktor.client.request.forms.InputProvider>? = null): HttpResponse<ModelApiResponse> {
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val localVariableAuthNames = listOf<String>("petstore_auth")
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‎samples/client/petstore/kotlin-jvm-ktor-kotlinx_serialization/src/main/kotlin/org/openapitools/client/apis/PetApi.kt‎

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@@ -83,7 +83,7 @@ import io.ktor.http.ParametersBuilder
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* @param apiKey (optional)
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* @return void
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*/
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open suspend fun deletePet(petId: kotlin.Long, apiKey: kotlin.String?): HttpResponse<Unit> {
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open suspend fun deletePet(petId: kotlin.Long, apiKey: kotlin.String? = null): HttpResponse<Unit> {
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val localVariableAuthNames = listOf<String>("petstore_auth")
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@@ -256,7 +256,7 @@ import io.ktor.http.ParametersBuilder
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* @param status Updated status of the pet (optional)
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* @return void
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*/
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open suspend fun updatePetWithForm(petId: kotlin.Long, name: kotlin.String?, status: kotlin.String?): HttpResponse<Unit> {
259+
open suspend fun updatePetWithForm(petId: kotlin.Long, name: kotlin.String? = null, status: kotlin.String? = null): HttpResponse<Unit> {
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val localVariableAuthNames = listOf<String>("petstore_auth")
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* @return ModelApiResponse
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*/
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@Suppress("UNCHECKED_CAST")
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open suspend fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: io.ktor.client.request.forms.FormPart<io.ktor.client.request.forms.InputProvider>?): HttpResponse<ModelApiResponse> {
298+
open suspend fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String? = null, file: io.ktor.client.request.forms.FormPart<io.ktor.client.request.forms.InputProvider>? = null): HttpResponse<ModelApiResponse> {
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val localVariableAuthNames = listOf<String>("petstore_auth")
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‎samples/server/petstore/kotlin-server-required-and-nullable-properties/src/main/kotlin/org/openapitools/server/apis/DefaultApiService.kt‎

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@@ -13,5 +13,5 @@ interface DefaultApiService {
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* @return Successful operation (status code 200)
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* @see DefaultApi#addPet
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*/
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fun addPet(pet: Pet?, ctx: Context): Pet
16+
fun addPet(pet: Pet? = null, ctx: Context): Pet
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}

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