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I tried to add java source roots to the Sample project. I selected nb_all/openide and the wizard suggested to mount several subdirs. I agreed and NPE was thrown.
Created attachment 9624 [details] NPE
Should be fixed by Svata's update.
VERIFIED
As described in http://www.netbeans.org/servlets/ReadMsg?msgId=619519&listName=nbdiscuss the current work on projects prototype has been stopped. Marking issue as CLOSED.