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This bug was originally marked as duplicate of bug 187844, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE Dev (Build nbms-and-javadoc-9622-on-20121116) VM: Java HotSpot(TM) Client VM, 23.5-b02, Java(TM) SE Runtime Environment, 1.7.0_09-b05 OS: Windows 7 Stacktrace: java.lang.IllegalStateException: Cannot initialize 0th child of node org.netbeans.modules.db.explorer.node.SchemaNode[name=db90668_nomi][Name=db90668_nomi, displayName=db90668_nomi]; it already belongs to node org.netbeans.modules.db.explorer.node.CatalogNode[name=db90668_nomi][Name=db90668_nomi, displayName=db90668_nomi] (did you forgot to use cloneNode?) Children of new node: null Children of old node: null at org.openide.nodes.Node.assignTo(Node.java:354) at org.openide.nodes.EntrySupportDefault.justComputeNodes(EntrySupportDefault.java:212) at org.openide.nodes.ChildrenArray.nodes(ChildrenArray.java:88) at org.openide.nodes.EntrySupportDefault.getNodes(EntrySupportDefault.java:130) at org.openide.nodes.EntrySupportDefault.getNodes(EntrySupportDefault.java:172) at org.openide.nodes.Children.getNodes(Children.java:469)
Created attachment 127970 [details] stacktrace
*** This bug has been marked as a duplicate of bug 221817 ***