java.lang.IllegalStateException: Cannot initialize 0th child of node org.netbeans.modules.db.explorer.node.CatalogNode@72809308[Name=Default, displayName=Default]; it already belongs to node org.netbeans.modules.db.explorer.node.ConnectionNode@6d1ea615[Name=jdbc:derby://localhost:1527/simpledb [app on APP], displayName=jdbc:derby://localhost:1527/simpledb [app on APP]] (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) Caused: java.lang.IllegalStateException: Cannot initialize 0th child of node org.netbeans.modules.db.explorer.node.CatalogNode@72809308[Name=Default, displayName=Default]; it already belongs to node org.netbeans.modules.db.explorer.node.ConnectionNode@6d1ea615[Name=jdbc:derby://localhost:1527/simpledb [app on APP], displayName=jdbc:derby://localhost:1527/simpledb [app on APP]] (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) Caused: java.lang.IllegalStateException: Cannot initialize 0th child of node org.netbeans.modules.db.explorer.node.CatalogNode@72809308[Name=Default, displayName=Default]; it already belongs to node org.netbeans.modules.db.explorer.node.ConnectionNode@6d1ea615[Name=jdbc:derby://localhost:1527/simpledb [app on APP], displayName=jdbc:derby://localhost:1527/simpledb [app on APP]] (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) Caused: java.lang.IllegalStateException: Cannot initialize 0th child of node org.netbeans.modules.db.explorer.node.CatalogNode@72809308[Name=Default, displayName=Default]; it already belongs to node org.netbeans.modules.db.explorer.node.ConnectionNode@6d1ea615[Name=jdbc:derby://localhost:1527/simpledb [app on APP], displayName=jdbc:derby://localhost:1527/simpledb [app on APP]] (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) Caused: java.lang.IllegalStateException: Cannot initialize 0th child of node org.netbeans.modules.db.explorer.node.CatalogNode@72809308[Name=Default, displayName=Default]; it already belongs to node org.netbeans.modules.db.explorer.node.ConnectionNode@6d1ea615[Name=jdbc:derby://localhost:1527/simpledb [app on APP], displayName=jdbc:derby://localhost:1527/simpledb [app on APP]] (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) Caused: java.lang.IllegalStateException: Cannot initialize 0th child of node org.netbeans.modules.db.explorer.node.CatalogNode@72809308[Name=Default, displayName=Default]; it already belongs to node org.netbeans.modules.db.explorer.node.ConnectionNode@6d1ea615[Name=jdbc:derby://localhost:1527/simpledb [app on APP], displayName=jdbc:derby://localhost:1527/simpledb [app on APP]] (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) Caused: java.lang.IllegalStateException: Cannot initialize 0th child of node org.netbeans.modules.db.explorer.node.CatalogNode@72809308[Name=Default, displayName=Default]; it already belongs to node org.netbeans.modules.db.explorer.node.ConnectionNode@6d1ea615[Name=jdbc:derby://localhost:1527/simpledb [app on APP], displayName=jdbc:derby://localhost:1527/simpledb [app on APP]] (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) Caused: java.lang.IllegalStateException: Cannot initialize 0th child of node org.netbeans.modules.db.explorer.node.CatalogNode@72809308[Name=Default, displayName=Default]; it already belongs to node org.netbeans.modules.db.explorer.node.ConnectionNode@6d1ea615[Name=jdbc:derby://localhost:1527/simpledb [app on APP], displayName=jdbc:derby://localhost:1527/simpledb [app on APP]] (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) Caused: java.lang.IllegalStateException: Cannot initialize 0th child of node org.netbeans.modules.db.explorer.node.CatalogNode@72809308[Name=Default, displayName=Default]; it already belongs to node org.netbeans.modules.db.explorer.node.ConnectionNode@6d1ea615[Name=jdbc:derby://localhost:1527/simpledb [app on APP], displayName=jdbc:derby://localhost:1527/simpledb [app on APP]] (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) Caused: java.lang.IllegalStateException: Cannot initialize -1th child of node org.netbeans.modules.db.explorer.node.CatalogNode@72809308[Name=Default, displayName=Default]; it already belongs to node org.netbeans.modules.db.explorer.node.ConnectionNode@6d1ea615[Name=jdbc:derby://localhost:1527/simpledb [app on APP], displayName=jdbc:derby://localhost:1527/simpledb [app on APP]] (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.notifyAdd(EntrySupportDefault.java:585) at org.openide.nodes.EntrySupportDefault.updateAdd(EntrySupportDefault.java:441) at org.openide.nodes.EntrySupportDefault.setEntries(EntrySupportDefault.java:295) at org.openide.nodes.EntrySupport.setEntries(EntrySupport.java:83) at org.openide.nodes.Children$Keys$2.run(Children.java:1556) at org.openide.util.Mutex$1Exec.run(Mutex.java:1246) at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1921) at org.openide.util.Mutex.postRequest(Mutex.java:1252) at org.openide.util.Mutex.postRequest(Mutex.java:1215) at org.openide.util.Mutex.postWriteRequest(Mutex.java:587) at org.openide.nodes.Children$Keys.applyKeys(Children.java:1565) at org.openide.nodes.Children$Keys.setKeys(Children.java:1509) at org.openide.nodes.AsynchChildren$1.add(AsynchChildren.java:190) Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.IllegalStateException: Cannot initialize -1th child of node org.netbeans.modules.db.explorer.node.CatalogNode@72809308[Name=Default, displayName=Default]; it already belongs to node org.netbeans.modules.db.explorer.node.ConnectionNode@6d1ea615[Name=jdbc:derby://localhost:1527/simpledb [app on APP], displayName=jdbc:derby://localhost:1527/simpledb [app on APP]] (did you forgot to use cloneNode?) Children of new node: null Children of old node: null at org.openide.util.RequestProcessor$Task.schedule(RequestProcessor.java:1495) at org.openide.nodes.AsynchChildren.refresh(AsynchChildren.java:133) at org.openide.nodes.ChildFactory.refresh(ChildFactory.java:167) at org.netbeans.api.db.explorer.node.ChildNodeFactory.refresh(ChildNodeFactory.java:77) at org.netbeans.api.db.explorer.node.BaseNode.update(BaseNode.java:284) at org.netbeans.api.db.explorer.node.BaseNode$1.stateChanged(BaseNode.java:231) at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:133) at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:119) at org.netbeans.modules.db.explorer.node.NodeRegistry.stateChanged(NodeRegistry.java:182) at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:133) at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:119) at org.netbeans.api.db.explorer.node.NodeProvider.setNodes(NodeProvider.java:191) at org.netbeans.modules.db.explorer.node.SchemaNodeProvider$1.run(SchemaNodeProvider.java:121) at org.netbeans.modules.db.explorer.node.SchemaNodeProvider$1.run(SchemaNodeProvider.java:102) at org.netbeans.modules.db.metadata.model.JDBCConnMetadataModel.runReadAction(JDBCConnMetadataModel.java:97) at org.netbeans.modules.db.metadata.model.api.MetadataModel.runReadAction(MetadataModel.java:92) at org.netbeans.modules.db.explorer.node.SchemaNodeProvider.initialize(SchemaNodeProvider.java:101) at org.netbeans.api.db.explorer.node.NodeProvider.getNodes(NodeProvider.java:107) at org.netbeans.modules.db.explorer.node.NodeRegistry.getNodes(NodeRegistry.java:167) at org.netbeans.api.db.explorer.node.NodeProvider.getNodes(NodeProvider.java:117) at org.netbeans.modules.db.explorer.node.NodeRegistry.getNodes(NodeRegistry.java:167) at org.netbeans.api.db.explorer.node.ChildNodeFactory.createKeys(ChildNodeFactory.java:107) at org.openide.nodes.AsynchChildren.run(AsynchChildren.java:209) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1454) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2036)