Tomcat Restful API 404 - json

Question

GET api/users/1
Here's the situation:
if user 1 does not exist, respond a 404 http status code and a json message.
The json message would like this:
{
"message": "Resouces `api/users/1` does not exist"
"error_code": 1000
}
And here's the code:
if(user == null) {
Map<String, Object> error = new HashMap<String, Object>();
error.put("message", "Resource `api/users/" + id + "` does not exist!");
error.put("error_code", 1000);
return new ResponseEntity<Object>(error, HttpStatus.NOT_FOUND);
}
return new ResponseEntity<Object>(user, HttpStatus.OK);
But tomcat returns a default error page without the response body:
What should I do, if I want a page like below:

Answer 1

Instead of returning error object return custom json object with status codes , or you can use error-page element which specifies mapping between error page and a handler method ,
404
/error
And then in your controller hand that .
Read more here

Answer 2

Instead of using
return new ResponseEntity<Object>(error, HttpStatus.NOT_FOUND);
Use
return new ResponseEntity<Object>(error, HttpStatus.SC_ACCEPTED);

Answer 3

This answer is provided by the OP and is edited out from the question.
Forgetting to add a ResponseBody annotation. Anyway, if declared the controller with the #RestController annotation, it won't be necessary.