private static ObjectMapper createObjectMapper() { final ObjectMapper mapper = new ObjectMapper(); mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false); final SimpleModule mod = new SimpleModule("form module"); mod.addSerializer(Form.class, new StdScalarSerializer<Form>(Form.class){ @Override public void serialize(final Form value, final JsonGenerator gen, final SerializerProvider provider) throws IOException { gen.writeObject(value.data()); } }); mapper.registerModule(mod); return mapper; }