How to return JSON object in resolveException method of HandlerExceptionResolver in Spring MVC?

If you use the Spring 3.2 above, I recommend this way.

1. At first, declare the ControllerAdvice.

   @Controller@ControllerAdvicepublic class JAttachfileApi extends BaseApi

2. And make the Exception Handler to response JSON Object as following.

       @ExceptionHandler(MaxUploadSizeExceededException.class)    public @ResponseBody Map<String,Object> handleMaxUploadSizeExceededException( MaxUploadSizeExceededException ex)     {        Map<String,Object> result = getResult();        JFileUploadJsonResponse errorResult = new JFileUploadJsonResponse();        errorResult.setError("Maximum upload size of "+ex.getMaxUploadSize()+" bytes exceeded.");        List<JFileUploadJsonResponse> resultData = new ArrayList<JFileUploadJsonResponse>();        resultData.add(errorResult);        result.put("files", resultData);      return result;    }

You simply can annotate the method resolveException as @ExceptionHandler() and then you can have its signature like any other controller method. So placing @ResponseBody before the return type should work.

"Much like standard controller methods annotated with a @RequestMapping annotation, the method arguments and return values of @ExceptionHandler methods can be flexible. For example, the HttpServletRequest can be accessed in Servlet environments and the PortletRequest in Portlet environments. The return type can be a String, which is interpreted as a view name, a ModelAndView object, a ResponseEntity, or you can also add the @ResponseBody to have the method return value converted with message converters and written to the response stream."