Current implementation of inputFileUpload not support PortletContext

Current implementation of inputFileUpload not support PortletContext

part code from HtmlFileUploadRenderer.java:

public void decode(FacesContext facesContext, UIComponent uiComponent)
{
super.decode(facesContext, uiComponent); //check for NP

//MultipartWrapper might have been wrapped again by one or more additional
//Filters. We try to find the MultipartWrapper, but if a filter has wrapped
//the ServletRequest with a class other than HttpServletRequestWrapper
//this will fail.
//todo: fix this to work in PortletRequest as well
if(facesContext.getExternalContext().getRequest() instanceof ServletRequest)
{