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I was looking through some source code and selecting methods and generating "Usages" tabs to see where those methods/classes/etc were being used. Each time I find "Usages", a new tab is created. After a short while, I had 7 "Usages" tabs at the bottom of my IDE. So I tried to close the right-most one and got the above-mentioned ArrayIndexOutOfBoundsException (see attached log file.) I made this a P2, because after this exception happens, the IDE pretty much becomes unusable. Every time I try to do anything, up pops the exception dialog. I ended up restarting the IDE. I'm attaching the IDE's messages.log file.
Created attachment 32067 [details] messages.log file that has system info and the exception(s)
Reassigning to "refactoring" for evaluation.
Unfortunatelly this is JDK bug. Thanks for your report. *** This issue has been marked as a duplicate of 75955 ***