MappingJacksonJsonView return top-level json object

Question

I converted to controller to use ContentNegotiatingViewResolver instead of MessageConverters to support multiple output types. With json, I am using MappingJacksonJsonView:

Answer 1

You should be able to remove the outer node by using MappingJacksonJsonView.setExtractValueFromSingleKeyModel(true):

Set whether to serialize models containing a single attribute as a map or whether to extract the single value from the model and serialize it directly.

The effect of setting this flag is similar to using MappingJacksonHttpMessageConverter with an @ResponseBody request-handling method.

For example:

private final MappingJacksonJsonView view = new MappingJacksonJsonView();

public MyController() {
     view.setExtractValueFromSingleKeyModel(true);
}

@RequestMapping(value = "/id/{id}", method = RequestMethod.GET)
public ModelAndView getById(@PathVariable (value="id") String id) {
    MyObject ret = doGetById(id);
    ModelAndView modelAndView = new ModelAndView();
    modelAndView.setView(this.view);
    modelAndView.addObject("myObject", ret);
    return modelAndView;
}

This should also work if you prefer to do it via configuration: