Returning JsonObject using @ResponseBody in SpringMVC

Question

I am using the new Java API (JSR 353) for JSON in a SpringMVC project.

The idea is to generate some piece of Json data and have it returned to the client. The contro

Answer 1

The answer from Sotirios Delimanolis does indeed work, but in my case I had to ensure the proper HttpMessageConverter order was in place. This is because I needed to also convert JodaTime values to ISO 8601 format. This custom WebMvcConfigurerAdapter Configuration worked for me:

@Configuration
public class WebConfiguration extends WebMvcConfigurerAdapter {

@SuppressWarnings("UnusedDeclaration")
private static final Logger log = LoggerFactory.getLogger(WebConfiguration.class);

public void configureMessageConverters(List> converters) {
    log.info("Configuring jackson ObjectMapper");
    final MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
    final ObjectMapper objectMapper = new ObjectMapper();

    //configure Joda serialization
    objectMapper.registerModule(new JodaModule());
    objectMapper.configure(com.fasterxml.jackson.databind.SerializationFeature.
            WRITE_DATES_AS_TIMESTAMPS, false);

    // Other options such as how to deal with nulls or identing...
    objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
    objectMapper.enable(SerializationFeature.INDENT_OUTPUT);
    converter.setObjectMapper(objectMapper);

    StringHttpMessageConverter stringHttpMessageConverter = new StringHttpMessageConverter();
    /*
    StringHttpMessageConverter must appear first in the list so that Spring has a chance to use
     it for Spring RestController methods that return simple String. Otherwise, it will use
      MappingJackson2HttpMessageConverter and clutter the response with escaped quotes and such
     */
    converters.add(stringHttpMessageConverter);
    converters.add(converter);
    super.configureMessageConverters(converters);
}
}