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Deleting a form in a Maven nbm-packaging project: INFO [org.openide.loaders.DataObject] java.lang.IllegalStateException: The data object .../WhateverPanelVisual.java@6f2fcfd8:47c5f2 is invalid; you may not call getNodeDelegate on it any more; see #17020 and please fix your code. this=org.netbeans.modules.form.FormDataObject@18f5483[.../WhateverPanelVisual.java@6f2fcfd8:47c5f2] id=26170499 primaryFileId=4703730 valid=true pool=null [catch] at org.openide.loaders.DataObject.getNodeDelegate(DataObject.java:291) at org.netbeans.modules.form.FormDesigner.switchNodeInLookup(FormDesigner.java:430) at org.netbeans.modules.form.FormDesigner.access$600(FormDesigner.java:102) at org.netbeans.modules.form.FormDesigner$NodeSelectionListener.propertyChange(FormDesigner.java:1143) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276) at org.openide.explorer.ExplorerManager$2.run(ExplorerManager.java:868) at org.openide.util.Mutex.doEvent(Mutex.java:1341) at org.openide.util.Mutex.readAccess(Mutex.java:348) at org.openide.explorer.ExplorerManager.fireInAWT(ExplorerManager.java:865) at org.openide.explorer.ExplorerManager$1AtomicSetSelectedNodes.fire(ExplorerManager.java:285) at org.openide.explorer.ExplorerManager.setSelectedNodes(ExplorerManager.java:296) at org.openide.explorer.ExplorerManager.setSelectedNodes0(ExplorerManager.java:446) at org.openide.explorer.ExplorerManager$1SetExploredContext.run(ExplorerManager.java:345) at org.openide.util.Mutex.readAccess(Mutex.java:365) at org.openide.util.Mutex$1R.run(Mutex.java:1307) at org.openide.util.Mutex.doWrapperAccess(Mutex.java:1324) at org.openide.util.Mutex.readAccess(Mutex.java:354) at org.openide.explorer.ExplorerManager.setExploredContext(ExplorerManager.java:362) at org.openide.explorer.ExplorerManager$1SetRootContext.run(ExplorerManager.java:497) at org.openide.util.Mutex.readAccess(Mutex.java:365) at org.openide.util.Mutex$1R.run(Mutex.java:1307) at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1920) at org.openide.util.Mutex.doWrapperAccess(Mutex.java:1326) at org.openide.util.Mutex.readAccess(Mutex.java:354) at org.openide.explorer.ExplorerManager.setRootContext(ExplorerManager.java:502) at org.netbeans.modules.form.FormDesigner.close(FormDesigner.java:295) at org.netbeans.modules.nbform.FormDesignerTC.closeDesigner(FormDesignerTC.java:164) at org.netbeans.modules.nbform.FormDesignerTC.componentClosed(FormDesignerTC.java:158) at org.netbeans.core.multiview.MultiViewPeer.peerComponentClosed(MultiViewPeer.java:253) at org.netbeans.core.multiview.MultiViewCloneableTopComponent.componentClosed(MultiViewCloneableTopComponent.java:120) at org.openide.windows.WindowManager.componentCloseNotify(WindowManager.java:322) at org.netbeans.core.windows.WindowManagerImpl.notifyTopComponentClosed(WindowManagerImpl.java:1113) at org.netbeans.core.windows.Central.removeModeTopComponent(Central.java:1011) at org.netbeans.core.windows.ModeImpl.removeTopComponent(ModeImpl.java:478) at org.netbeans.core.windows.ModeImpl.close(ModeImpl.java:286) at org.netbeans.core.windows.WindowManagerImpl.topComponentClose(WindowManagerImpl.java:1278) at org.openide.windows.TopComponent.close(TopComponent.java:575) at org.openide.windows.TopComponent.close(TopComponent.java:562) at org.openide.windows.CloneableOpenSupport$2.run(CloneableOpenSupport.java:158) at org.openide.windows.CloneableOpenSupport$2.run(CloneableOpenSupport.java:144) at org.openide.util.Mutex.doEventAccess(Mutex.java:1361) at org.openide.util.Mutex.writeAccess(Mutex.java:380) at org.openide.windows.CloneableOpenSupport.close(CloneableOpenSupport.java:143) at org.openide.text.CloneableEditorSupport.close(CloneableEditorSupport.java:2157) at org.openide.windows.CloneableOpenSupport$Listener.run(CloneableOpenSupport.java:348) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:641) at java.awt.EventQueue.access$000(EventQueue.java:84) at java.awt.EventQueue$1.run(EventQueue.java:602) at java.awt.EventQueue$1.run(EventQueue.java:600) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) at java.awt.EventQueue.dispatchEvent(EventQueue.java:611) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:162) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)