생성한 object mapper 에 다음 옵션을 넣어보세요
mMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
mMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
mMapper.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);