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After running a plain Java project, I clicked to close the Outputs pane, then clicked in the Project Explorer view to expand my project's "Source Packages". At this point the exception occurred. Not sure if this is thread-related, but it happened for the first time, and right now my machine is very busy compiling stuff in the background. Messages.log is attached.
Created attachment 35397 [details] messages.log
*** Issue 87564 has been marked as a duplicate of this issue. ***
Hopefully fixed in main trunk: Checking in AbstractViewTabDisplayerUI.java; /cvs/core/swing/tabcontrol/src/org/netbeans/swing/tabcontrol/plaf/AbstractViewTabDisplayerUI.java,v <-- AbstractViewTabDisplayerUI.java new revision: 1.32; previous revision: 1.31