MultipartFile springmvc parameters of the problem if you do not upload a file error

 1 @RequestMapping(value = "/updateInformation",method = RequestMethod.POST)
 2     @ResponseBody
 3     public Boolean updateInformation(Commodity commodity, HttpServletRequest request)throws Exception {
 4         MultipartFile file = null;
 5         boolean isMultipart = ServletFileUpload.isMultipartContent(request);
 6         if (isMultipart){
 7             MultipartHttpServletRequest multipartRequest = WebUtils.getNativeRequest(request, MultipartHttpServletRequest.class);
 8             file = multipartRequest.getFile("file");
 9         }
10       }

pojo commodity class is 
the error code is such a

  @RequestMapping(value = "/updateInformation",method = RequestMethod.POST)
    @ResponseBody
    public Boolean updateInformation(@RequestParam("file") MultipartFile file,Commodity commodity, HttpServletRequest request)throws Exception {
       }

　　Background being given; Required request part 'file' is not present

　　Error page is: Request method 'GET' not supported