code: private JSON getJSON() throws JSONMarshallException {
          if (json == null) {
              JSONSettings settings = new JSONSettings(Include.NON_NULL);
              json = JSONFactory.newInstance(settings);
          }
          return json;
      }
docs: Utility that returns a JSON object from a factory
  
  @return the JSON object providing POJO-JSON serialization and deserialization
  @throws JSONMarshallException if there are problems configuring serialization inclusion