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Build: NetBeans IDE 6.1 (Build 200804211638) VM: Java HotSpot(TM) Client VM, 10.0-b19, Java(TM) SE Runtime Environment, 1.6.0_05-b13 OS: SunOS, 5.10, x86 User Comments:
Created attachment 60950 [details] stacktrace
It looks like bug in JDK/Swing code. AbstractButton.removeNotify on line 1013 it seems that getModel() could return null and check is missing. I can't find such bug in JDK bug database, however I need reproducible scenario in order to file bug against JDK/Swing. So please try to find reproducible set of steps which leads to error, and reopen with that information, thank you.
v/c