title: Spring REST MultipartFile file is always null when do upload file
body: <pre><code>@RequestMapping(value = "{fileName:.+}", method = RequestMethod.POST, consumes = { MediaType.MULTIPART_FORM_DATA_VALUE})
  public ResponseEntity&lt;ResponseEnvelope&lt;String&gt;&gt; uploadFile(
           @RequestParam("ownerId") Long ownerId, 
           @PathVariable("fileName") String fileName,
           @RequestBody MultipartFile file)
           throws Exception {
      ResponseEnvelope&lt;String&gt; env;
      if(null == certFileContent) {
          env = new ResponseEnvelope&lt;String&gt;("fail");
          return new ResponseEntity&lt;ResponseEnvelope&lt;String&gt;&gt;(env, HttpStatus.OK);
      }
      service.uploadCertificate(ownerId, fileName, certFileContent.getBytes());
      env = new ResponseEnvelope&lt;String&gt;("success");
      return new ResponseEntity&lt;ResponseEnvelope&lt;String&gt;&gt;(env, HttpStatus.OK);
  }
  </code></pre>
  
  <p>Why I always get the file value is null, I've configure the multipart support,see below,</p>
  
  <p>
      
      </p>