Fix #928

Author: cowtowncoder

release-notes/VERSION

@@ -13,6 +13,7 @@ Project: jackson-databind
 #913: ObjectMapper.copy does not preserve MappingJsonFactory features
  (reported, fixed by Daniel W)
 #922: ObjectMapper.copy() does not preserve _registeredModuleTypes
+#928: Problem deserializing External Type Id if type id comes before POJO
 
 2.6.1 (09-Aug-2015)
 

src/main/java/com/fasterxml/jackson/databind/deser/BeanDeserializer.java

@@ -789,7 +789,9 @@ protected Object deserializeUsingPropertyBasedWithExternalTypeId(JsonParser p, D
             SettableBeanProperty creatorProp = creator.findCreatorProperty(propName);
             if (creatorProp != null) {
                 // first: let's check to see if this might be part of value with external type id:
-                if (ext.handlePropertyValue(p, ctxt, propName, buffer)) {
+                // 11-Sep-2015, tatu: Important; do NOT pass buffer as last arg, but null,
+                //   since it is not the bean
+                if (ext.handlePropertyValue(p, ctxt, propName, null)) {
                     ;
                 } else {
                     // Last creator property to set?

src/test/java/com/fasterxml/jackson/databind/jsontype/TestExternalId.java

@@ -238,11 +238,12 @@ public Issue222BeanB() { }
 
     // [databind#928]
     static class Envelope928 {
-        @JsonTypeInfo(use=JsonTypeInfo.Id.CLASS, include=JsonTypeInfo.As.EXTERNAL_PROPERTY, property="class")
-        Object payload;
+        Object _payload;
 
-        public Envelope928(@JsonProperty("payload") Object payload) {
-            this.payload = payload;
+        public Envelope928(@JsonProperty("payload")
+        @JsonTypeInfo(use=JsonTypeInfo.Id.CLASS, include=JsonTypeInfo.As.EXTERNAL_PROPERTY, property="class")
+        Object payload) {
+            _payload = payload;
         }
     }
 
@@ -487,12 +488,12 @@ public void testInverseExternalId928() throws Exception
         final String successCase = "{\"payload\":{\"something\":\"test\"},\"class\":\""+CLASS+"\"}";
         Envelope928 envelope1 = mapper.readValue(successCase, Envelope928.class);
         assertNotNull(envelope1);
-        assertEquals(Payload928.class, envelope1.payload.getClass());
+        assertEquals(Payload928.class, envelope1._payload.getClass());
 
         // and then re-ordered case that was problematic
         final String failCase = "{\"class\":\""+CLASS+"\",\"payload\":{\"something\":\"test\"}}";
         Envelope928 envelope2 = mapper.readValue(failCase, Envelope928.class);
         assertNotNull(envelope2);
-        assertEquals(Payload928.class, envelope2.payload.getClass());
+        assertEquals(Payload928.class, envelope2._payload.getClass());
     }
 }