Support type modifiers in type id name resolution.

src/main/java/com/fasterxml/jackson/databind/jsontype/impl/TypeNameIdResolver.java

@@ -82,7 +82,7 @@ public static TypeNameIdResolver construct(MapperConfig<?> config,
     @Override
     public String idFromValue(Object value)
     {
-        Class<?> cls = value.getClass();
+        Class<?> cls = _typeFactory.constructType(value.getClass()).getRawClass();
         final String key = cls.getName();
         String name;
         synchronized (_typeToId) {

src/test/java/com/fasterxml/jackson/databind/module/TestTypeModifierNameResolution.java

@@ -0,0 +1,58 @@
+package com.fasterxml.jackson.databind.module;
+
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.fasterxml.jackson.databind.JavaType;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.type.TypeBindings;
+import com.fasterxml.jackson.databind.type.TypeFactory;
+import com.fasterxml.jackson.databind.type.TypeModifier;
+import com.fasterxml.jackson.test.BaseTest;
+
+import java.lang.reflect.Type;
+
+public class TestTypeModifierNameResolution extends BaseTest {
+
+	interface MyType {
+		String getData();
+		void setData(String data);
+	}
+
+	static class MyTypeImpl implements MyType {
+		private String data;
+
+		public String getData() {
+			return data;
+		}
+
+		public void setData(String data) {
+			this.data = data;
+		}
+	}
+
+	static class CustomTypeModifier extends TypeModifier {
+		@Override
+		public JavaType modifyType(JavaType type, Type jdkType, TypeBindings context, TypeFactory typeFactory) {
+			if (type.getRawClass().equals(MyTypeImpl.class)) {
+				return typeFactory.constructType(MyType.class);
+			}
+			return type;
+		}
+	}
+
+	@JsonTypeInfo(use=JsonTypeInfo.Id.NAME, include=JsonTypeInfo.As.WRAPPER_OBJECT)
+	public interface Mixin { }
+
+	// Expect that the TypeModifier kicks in when the type id is written.
+	public void testTypeModiferNameResolution() throws Exception
+	{
+		ObjectMapper mapper = new ObjectMapper();
+		mapper.setTypeFactory(mapper.getTypeFactory().withModifier(new CustomTypeModifier()));
+		mapper.addMixInAnnotations(MyType.class, Mixin.class);
+
+		MyType obj = new MyTypeImpl();
+		obj.setData("something");
+
+		String s = mapper.writer().writeValueAsString(obj);
+		assertTrue(s.startsWith("{\"TestTypeModifierNameResolution$MyType\":"));
+	}
+}