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I first encountered this issues a couple months ago and thought it was fixed, but this morning I encountered again. Here's the scenario: I am perusing a large project and am doing alot of "Find Usages". After I had done four of these "Find Usages", I had 4 "Find Usages" tabs open. I tried deleting the right-most one and get the aforementioned ArrayIndexOutOfBoundsException exception (relevant messages.log is attached.) After this happens, the IDE becomes pretty unusable - every time I try to close the warning dialog that shows the exception, it pops right back up again. I have to restart the IDE. Thus, I'm giving this a 'P2'.
Created attachment 33162 [details] messages.log file with stack trace of exception and system config
Unfortunatelly this is JDK bug. Thanks for your report. *** This issue has been marked as a duplicate of 75955 ***