ajax post request to Spring MVC Controller not working

I am facing the error - Failed to load resource: the server responded with a status of 415 (Unsupported Media Type)

ajax portion of my code is as follows

        $.ajax({ 
                url:'/authentication/editUser',    
                type:"POST", 
                contentType: "application/json",
                data: JSON.stringify(requestObj), //Stringified Json Object
                success: function(resposeJsonObject){                           
             }});

and the controller's handler method:

    @RequestMapping(value = "/editUser" , method = RequestMethod.POST, headers = {"Content-type=application/json"})
    @ResponseBody
    public  EditUserResponse editUserpost(@RequestBody EditUserRequest editUserRequest){


        System.out.println(editUserRequest);

        return new EditUserResponse();
    }

how to resolve the error ?