ADF : Valuechangelistener doesnot work sometimes

Hi,
I do have a jsp page with three iterators in it. I do have a <af:inputFile component in the jsp page with a 'ValuechangeListener' which does some action. Below this component, I have a command button which uploads the document. But as the valuechangelistner doesnot get executed, I always get null pointer exception.
Could anyone please tell me why valuechangeListener doesnot work in here?
Thanks,
Haripriya.S

... here's the expected snippet from the documentation
<af:form usesUpload="true">
  <af:inputFile columns="10"
                valueChangeListener="#{backing.fileUploaded}"/>
</af:form>Frank

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