Ajax submit form with empty file input

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Ajax submit form with empty file input

Hi all,

is it possible to ajax submit a form that has a file input between its
fields, even if this input is always empty at the time of submission?

For example, the following example throws a 'ServletRequest does not contain
multipart content' exception when clicking the ajaxSubmit button, even if

        Form form = new Form("form");
        form.add(new TextField("text", new PropertyModel(this, "text")));
        form.add(new FileUploadField("file"));
        form.add(new AjaxButton("ajaxSubmit", form) {
            protected void onSubmit(AjaxRequestTarget target, Form form) {

The fact is that I will upload images using another, hidden and not nested,
form with an iframe as its target, so the above form will never be submitted
with a non-empty file input.

How can I do this?

Thank you in advance
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