protected ObjectMapper initialValue() {
ObjectMapper mapper = new ObjectMapper();
mapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);
AnnotationIntrospector introspector = new AnnotationIntrospector.Pair(new JaxbAnnotationIntrospector(),
new JacksonAnnotationIntrospector());
SerializationConfig sc = mapper.getSerializationConfig().withSerializationInclusion(
JsonSerialize.Inclusion.NON_NULL);
mapper.setSerializationConfig(sc.withAnnotationIntrospector(introspector));
mapper.setDeserializationConfig(mapper.getDeserializationConfig().withAnnotationIntrospector(