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While debugging a Maven-based Swing Application Framework program I have recently seen a few cases where calling the debugger seemed to stop all X events from happening. The mouse would still move but no window would respond to clicks, keyboard events don't seem to go anywhere either. Switching to a text-terminal (Ctrl+Alt+F1) still works and killing the Java application revives X and NetBeans. This doesn't happen every time, but reasonably often. I have seen it multiple times in the last week or two running nightlies (last time on 200903310200). Unfortunately I don't have any reliable way of reproducing the problem.
This is most likely a duplicate of issue #93076. Unfortunately there is no support for detection of native locks in debugging application. Therefore this can not be fixed. *** This issue has been marked as a duplicate of 93076 ***
Verified ... and Closing all issues resolved into NetBeans 6.7 and earlier.