java.lang.NullPointerException
        at org.netbeans.modules.java.JavaNode$StateUpdater.actionPerformed(JavaNode.java:899)
        at javax.swing.Timer.fireActionPerformed(Timer.java:150)
[catch] at javax.swing.Timer$DoPostEvent.run(Timer.java:108)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:154)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:337)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:131)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:98)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)