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I've gotten an ArrayIndexOutOfBoundsException when attempting to close the last of serveral open Find Usages panes in NetBeans (5.5 latest dev build). It doesn't happen all the time, but once it does, you can't do anything more because the exception happens on every paint request, so you have to restart. I may have seen this exception on other output window area panels that have subtabs (can't remember which those are right now). I've seen this exception several times in the past few weeks. This is running on JDK 1.6 b92, so I suppose it could be a Mustang issue too.
Created attachment 32385 [details] stack trace
You're right it's JDK bug. Thanks for your report. *** This issue has been marked as a duplicate of 75955 ***