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I only tried to build my project.
Created attachment 11427 [details] Stack trace
I used project customizer before compilation and I set "target" and "source" property on java tab to value "1.4".
Seems like problem in ProjectMemberList synchronization.
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 VERIFIED --->
---> CLOSED