code: public static ObjectMapper getDefaultObjectMapper() {
  
          ObjectMapper mapper = new ObjectMapper();
  
          mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
          mapper.configure(DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_AS_NULL, true);
  
          mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
          mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
  
          return mapper;
      }
docs: Gets default object mapper.
  
  @return the default object mapper