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This bug was originally marked as duplicate of bug 114228, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 7.2 Beta (Build 201205031832) VM: Java HotSpot(TM) 64-Bit Server VM, 23.0-b21, Java(TM) SE Runtime Environment, 1.7.0_04-b22 OS: Windows 7 User Comments: GUEST: Your UI SUCKS BALLS!!! Stacktrace: java.lang.NullPointerException at org.openide.nodes.Children$Keys.setKeys(Children.java:1480) at org.netbeans.modules.websvc.design.navigator.WSDesignViewNavigatorContent$WSChildren.updateKeys(WSDesignViewNavigatorContent.java:133) at org.netbeans.modules.websvc.design.navigator.WSDesignViewNavigatorContent$WSChildren.addNotify(WSDesignViewNavigatorContent.java:124) at org.openide.nodes.Children.callAddNotify(Children.java:575) at org.openide.nodes.EntrySupport$Default.getArray(EntrySupport.java:770) at org.openide.nodes.EntrySupport$Default.getNodes(EntrySupport.java:172)
Created attachment 120509 [details] stacktrace
WSDesignViewNavigatorContent$WSChildren, don't call setKeys with null please.
It has been fixed as a fix for issue #211593.