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I closed a tab in the output window and suddenly NetBeans did not react anymore. In the log files I saw *a lot* of ArrayIndexOutOfBoundsExceptions.
Created attachment 30141 [details] Netbeans log file with lots of Exceptions
IAE from form module, reassigne ...
There are two harmless exceptions from form module at the start of the log file, but they are not related to the described problem. Note that the first was thrown at 12:02 and the second at 1:37. The reported problem occured at 1:46 as can be seen from the tons of exceptions (from the output window) at the end of the log file => reassigning to core/output.
i suppose you were using a jdk 1.6 build? looks like aq duplicate of #75955, should be fixed/workarounded in trunk and 5.5 branch. *** This issue has been marked as a duplicate of 75955 ***