See the mail: http://mail.openjdk.java.net/pipermail/swing-dev/2012-November/002361.html NetBeans has about 35 reports about the issue. There is no known steps to reproduce it. Build: NetBeans IDE Dev (Build 201211060001) VM: Java HotSpot(TM) 64-Bit Server VM, 23.5-b02, Java(TM) SE Runtime Environment, 1.7.0_09-b05 OS: Windows 7 Stacktrace: java.lang.NullPointerException at javax.swing.plaf.basic.BasicTreeUI$Actions.page(BasicTreeUI.java:4470) at javax.swing.plaf.basic.BasicTreeUI$Actions.actionPerformed(BasicTreeUI.java:4046) at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1664) at javax.swing.JComponent.processKeyBinding(JComponent.java:2879) at javax.swing.JComponent.processKeyBindings(JComponent.java:2926) at javax.swing.JComponent.processKeyEvent(JComponent.java:2842)
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