How do I get a MultipartRequest out of a Servlet3SecurityContextHolderAwareRequestWrapper

Question

I'm using Grails 2.4.3 and I have a <g:uploadForm> with method set to post, but I'm not getting a MutlipartRequest in my controller action. Instead I'm getting a Servlet3SecurityContextHolderAwareRequestWrapper which has not getFile() method. I've tried casting, I've tried getting the request out of the wrapper with request.request, and I've tried a bunch of other things I've seen suggested to others with a similar problem, but still no dice. I'm sure I'm missing something simple. I tend to do that, but if anyone can point me in the right direction, I'd be very grateful.

Here's my form:

  <g:uploadForm method="POST" action="uploadSupplemental" >
    <div class="modal-header">
      <h3 class="modal-title" id="myModalLabel">Upload Supplemental Data File</h3>
    </div>
    <div class="modal-body">
      <label for="fileInput">Choose file to upload:</label>
      <input type="file" id="fileInput" name="supplementalData" />
    </div>
    <div class="modal-footer">
      <button type="button" class="btn btn-default" data-dismiss="modal">Cancel</button>
      <input type="submit" class="btn btn-primary" />
    </div>
  </g:uploadForm>

And here's my controller action:

  def uploadSupplemental() {
    MultipartRequest multipartRequest =  request as MultipartRequest
    def file = multipartRequest.getFile('supplementalData')
    if (file){
      flash.message = "File found!!"
    } else {
      flash.message = "File NOT found.  :-( "
    }
    redirect action:'list'
  }

And here's the error I get:

URI /app/upload/uploadSupplemental Class groovy.lang.MissingMethodException Message No signature of method: org.springframework.security.web.servletapi.HttpServlet3RequestFactory$Servlet3SecurityContextHolderAwareRequestWrapper.getFile() is applicable for argument types: (java.lang.String) values: [supplementalData] Possible solutions: getXML(), getPart(java.lang.String), getAt(java.lang.String), getAt(java.lang.String), getLocale(), getJSON()

Answer 1

The following config property has to be set to true in Config.groovy in order to enable multipart requests.

grails.web.disable.multipart=true

Here is a related JIRA issue and a duplicate question in SO reporting the same exception.

Also make sure the user is authenticated (with @Secured) before the upload action.