I encountered a similar NPE error with the upload portlet and was able to get 
it working by explicitly setting the PortletMode for the Action URL used by the 
form:


  | PortletURL uploadActionURL = renderResponse.createActionURL();
  | uploadActionURL.setPortletMode(PortletMode.VIEW);
  | 
  | ...
  | 
  | <form id="uploadForm" action="<%=uploadActionURL.toString()%>" 
enctype="multipart/form-data" method="post">
  | 

Doing this got me past the NPE and file uploads working as setup in the Spring 
MVC Portlet example. 



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