code: private ObjectMapper createObjectMapper() {
          ObjectMapper mapper = new ObjectMapper();
          mapper.registerModule(new JodaModule());
          mapper.configure(SerializationFeature.INDENT_OUTPUT, true);
          return mapper;
      }
docs: Create the ObjectMapper that deserializes entity to json String.
  
  Registers the JodaModule to convert DateTime so-called epoch timestamp (number of milliseconds since January 1st, 1970,
  UTC)
  
  @return