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[ BUILD # : 200711041200 ] [ JDK VERSION : 1.6.0_02 ] Just to reproduce another issue, I removed netbeans' user directory and installed the latest nightly. Open it up and created a web application with default settings. With no further changes I installed the RESTful Web Services plugin which asked me whether it should've restarted netbeans. Upon starting it up again (after the restart) NPE's thrown. See the attachment.
Created attachment 52497 [details] NPE stack trace
From the stack trace I don't see any relation with rest module. Reassigning to languages component.
Seems like a race condition in offsetsBag variable (class SemanticHighlightsLayer). If so, should occure rarely.
this issue has already been fixed.