MultipartRequest and form population after validation failed

[Franz-Josef Herpers]

Hi,

I've a little problem with form population after a multipart request's 
file size exceeded. What I do is testing the file size of an uploaded 
file in the validate method of a form:

  public ActionErrors validate(ActionMapping mapping,
                               HttpServletRequest request) {

    ActionErrors errors = new ActionErrors();

    String requestAttrName
        = MultipartRequestHandler.ATTRIBUTE_MAX_LENGTH_EXCEEDED;
    Object o = request.getAttribute(requestAttrName);
    Boolean fileLengthExceeded = (Boolean) o;

    if ((fileLengthExceeded != null) && 
fileLengthExceeded.booleanValue()) {
      errors.add(ActionMessages.GLOBAL_MESSAGE,
                 new ActionMessage("maxLengthExceeded"));
    }

    if (errors.isEmpty()) {
      errors = super.validate(mapping, request);
    }

    return errors;

  }

As you can see from the call to super.validate, there are some other 
fields which should be validated. When the user filled out these other 
fields correctly and uploads a file that is too big, he is forwarded too 
input page. So validation works as expected. But the problem is, that 
the values of the other fields are gone. A look in the Struts code 
reveals why: In RequestUtils#populate you can find the same test for 
file size:

Boolean maxLengthExceeded =
                        (Boolean) request.getAttribute(

MultipartRequestHandler.ATTRIBUTE_MAX_LENGTH_EXCEEDED);
                if ((maxLengthExceeded != null) && 
(maxLengthExceeded.booleanValue())) {
                    return;
                }

And the method returns immediately, if the file size is too big. That 
means *before* the form is populated. So I populatetd the form by myself 
in the validate method by reusing code from RequestUtils, just to  find, 
that that's not the end of the story. In 
CommonsMultipartRequestHandler#handleRequest you find again this test 
and again *before* the text parameters are set.

Is there any "easy" solution for this problem and is it "stupid" to ask, 
why not populate (even if this is only for redisplaying values) the form 
or in the case of MultipartRequestHandlers, set the text parameters, 
*before* testing the file size and returning?

Thanks in advance
Franz


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