How to respond with an HTTP 400 error in a Spring MVC @ResponseBody method returning String

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Change your return type to ResponseEntity<>, and then you can use the below for 400:

return new ResponseEntity<>(HttpStatus.BAD_REQUEST);

And for a correct request:

return new ResponseEntity<>(json,HttpStatus.OK);

After Spring 4.1 there are helper methods in ResponseEntity which could be used as:

return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(null);

and

return ResponseEntity.ok(json);

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