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I see AssertionError(see attachment), only on Linux Ubuntu and only on JDK 1.5.0_12 -> means JDK6.0_02 is ok as well as other OSes, during javahelp tests run, during invocation Help by F1.
Created attachment 45284 [details] AssertionError - stack trace
It seems that this has the same cause as bug #90590.
The method from which the AssertionError is thrown, is: @Override public boolean isEnabled() { assert EventQueue.isDispatchThread(); return checkDirection() != null; } It is the assertion that EventQueue.isDispatchThread() what fails. But from the callstack, it is apparent that the method was actually called from an event-dispatching thread. Most probably this is caused by some of the following JDK bugs: http://bugs.sun.com/view_bug.do?bug_id=6542185 - "Threading issues with java.awt.EventQueue.push/pop" http://bugs.sun.com/view_bug.do?bug_id=6424157 - "java.awt.EventQueue push/pop might cause threading issues" http://bugs.sun.com/view_bug.do?bug_id=6553239 - "one more threading problem with EventQueue.pop()" This bug is really hard to reproduce and it does not happen in recent builds. It also happened only during automatic tests, not during real work with NetBeans, so I lower the priority to P4. This is caused by a JDK bug so I mark this bug as WONTFIX, with an appropriate JDK bug reference in the status whiteboard field.
v/c