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This bug was originally marked as duplicate of bug 185666, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 6.9.1 (Build 201007282301) VM: Java HotSpot(TM) Client VM, 22.0-b10, Java(TM) SE Runtime Environment, 1.7.0_02-b13 OS: Windows XP User Comments: kusmambang: error Stacktrace: java.lang.IllegalArgumentException: Original Node from map {position=101, iconResource=org/netbeans/modules/db/resources/database.gif, name=Databases, original=null, displayName=Databases, instanceCreate=org.openide.nodes.LazyNode[name=null][Name=Databases, displayName=Databases]} is null at org.openide.nodes.LazyNode.switchToOriginal(LazyNode.java:85) at org.openide.nodes.LazyNode$SwitchChildren.addNotify(LazyNode.java:107) at org.openide.nodes.Children.callAddNotify(Children.java:554) at org.openide.nodes.EntrySupport$Default.getArray(EntrySupport.java:758) at org.openide.nodes.EntrySupport$Default.getNodes(EntrySupport.java:169) at org.openide.nodes.EntrySupport$Default.getNodes(EntrySupport.java:225)
Created attachment 115260 [details] stacktrace
Thanks for your report. The next major release of netbeans (7.2) is beginning it's release process. The version you were using is pretty old (~2 years). There is a good chance that your problem is fixed in a current version. Please try with 7.1.2 (the current release) or the current nightly builds. If your problem is still present. Please reopen this bug.