Java Development Tools

Hello all,

I have a problem with cancelling a form containing file upload field. In short, the upload happens even in case I click on Cancel button. What's the way to prevent "submitting" the form, but letting the server side continue navigating?
In long, I have such form:

<?xml version='1.0' encoding='UTF-8'?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.1"
          xmlns:f="http://java.sun.com/jsf/core"
          xmlns:h="http://java.sun.com/jsf/html"
          xmlns:af="http://xmlns.oracle.com/adf/faces/rich">
  <jsp:directive.page contentType="text/html;charset=UTF-8"/>
  <f:view>
    <af:document id="d1" title="File upload">
      <af:form id="f1" usesUpload="true">
        <af:inputFile label="Choose file: " id="if1" required="true"
                      showRequired="false"
                      requiredMessageDetail="You have to choose the file."/>
        <af:commandButton text="Upload" id="cb1" action="submit"/>
        <af:commandButton text="Cancel" id="cb2" immediate="true"
                          action="cancel"/>
      </af:form>
    </af:document>
  </f:view>
</jsp:root>

with very simple unbounded taskflow - action <font face="courier">submit</font> goes to one page (pageFileUploaded), action <font face="courier">cancel</font> to another page (pageCancel).

The problem is that even I click on Cancel the file choosen is being uploaded and just then the pageCancel is shown, which in case of big files or slow connections is not acceptable. How to prevent this? How to show the pageCancel immediately after clicking Cancel button?

Thank you in advance.

Regards,
Rox

P.S.: Using JDeveloper 11.1.1.5.0.