java.lang.IllegalStateException: Should not acquire Children.MUTEX while holding ProjectManager.mutex()
   at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1832)
   at org.openide.util.Mutex.doWrapperAccess(Mutex.java:1326)
   at org.openide.util.Mutex.readAccess(Mutex.java:354)
   at org.openide.explorer.view.TreeView$TreePropertyListener.propertyChange(TreeView.java:1228)
   at org.openide.util.WeakListenerImpl$PropertyChange.propertyChange(WeakListenerImpl.java:196)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
   at org.openide.explorer.ExplorerManager$2.run(ExplorerManager.java:868)
   at org.openide.util.Mutex.doEvent(Mutex.java:1341)
   at org.openide.util.Mutex.readAccess(Mutex.java:348)
   at org.openide.explorer.ExplorerManager.fireInAWT(ExplorerManager.java:865)
   at org.openide.explorer.ExplorerManager$Listener.propertyChange(ExplorerManager.java:935)
Caused: java.lang.reflect.InvocationTargetException
   at sun.reflect.GeneratedMethodAccessor72.invoke(GeneratedMethodAccessor72.java:0)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:459)
Caused: java.lang.reflect.UndeclaredThrowableException
   at $Proxy7.propertyChange(.java:0)
   at org.openide.nodes.Node.fireOwnPropertyChange(Node.java:1252)
   at org.openide.nodes.Node.fireCookieChange(Node.java:1225)
   at org.openide.nodes.FilterNode$NodeAdapter.propertyChange(FilterNode.java:1235)
   at org.openide.nodes.FilterNode$NodeAdapter.propertyChange(FilterNode.java:1180)
   at org.openide.nodes.Node.fireOwnPropertyChange(Node.java:1252)
   at org.openide.nodes.Node.fireCookieChange(Node.java:1225)
   at org.openide.nodes.Node$LookupEventList.resultChanged(Node.java:1734)
   at org.openide.nodes.FilterNode$FilterLookup$ProxyResult.resultChanged(FilterNode.java:2265)
   at org.openide.util.lookup.AbstractLookup$NotifyListeners.run(AbstractLookup.java:524)
   at org.openide.util.lookup.AbstractLookup.notifyIn(AbstractLookup.java:304)
   at org.openide.util.lookup.AbstractLookup.setPairs(AbstractLookup.java:297)
   at org.openide.util.lookup.AbstractLookup.setPairs(AbstractLookup.java:285)
   at org.openide.nodes.NodeLookup.updateLookupAsCookiesAreChanged(NodeLookup.java:233)
   at org.openide.nodes.Node.fireCookieChange(Node.java:1222)
   at org.openide.loaders.DataNode.access$700(DataNode.java:67)
   at org.openide.loaders.DataNode$4.run(DataNode.java:775)
   at org.openide.util.Mutex.doEvent(Mutex.java:1341)
   at org.openide.util.Mutex.writeAccess(Mutex.java:455)
   at org.openide.loaders.DataNode.fireChange(DataNode.java:751)
   at org.openide.loaders.DataNode$PropL.propertyChange(DataNode.java:895)
   at org.openide.util.WeakListenerImpl$PropertyChange.propertyChange(WeakListenerImpl.java:196)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
   at org.openide.loaders.DataObject.firePropertyChange(DataObject.java:925)
   at org.openide.loaders.MultiDataObject.fireCookieChange(MultiDataObject.java:852)
   at org.openide.loaders.MultiDataObject$ChangeAndBefore.stateChanged(MultiDataObject.java:1270)
   at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:133)
   at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:119)
   at org.openide.nodes.CookieSet.fireChangeEvent(CookieSet.java:303)
   at org.openide.nodes.CookieSet.add(CookieSet.java:137)
   at org.netbeans.modules.xml.cookies.DefaultCookieManager.addCookie(DefaultCookieManager.java:77)
   at org.netbeans.modules.xml.cookies.DataObjectCookieManager.addCookie(DataObjectCookieManager.java:94)
   at org.netbeans.modules.xml.text.TextEditorSupport.notifyModified(TextEditorSupport.java:263)
   at org.openide.text.CloneableEditorSupport.callNotifyModified(CloneableEditorSupport.java:1898)
   at org.openide.text.CloneableEditorSupport$Listener.vetoableChange(CloneableEditorSupport.java:2855)
   at org.netbeans.editor.BaseDocument.notifyModify(BaseDocument.java:1878)
   at org.netbeans.editor.BaseDocument.notifyModifyCheckStart(BaseDocument.java:1011)
   at org.netbeans.editor.BaseDocument.remove(BaseDocument.java:908)
   at javax.swing.text.AbstractDocument.replace(AbstractDocument.java:652)
   at org.netbeans.modules.xml.xdm.visitor.Utils.replaceDocument(Utils.java:114)
   at org.netbeans.modules.xml.xdm.visitor.Utils.replaceDocument(Utils.java:126)
   at org.netbeans.modules.xml.xdm.XDMModel.flushDocument(XDMModel.java:889)
   at org.netbeans.modules.xml.xdm.XDMModel.flush(XDMModel.java:148)
   at org.netbeans.modules.xml.xdm.xam.XDMAccess.flush(XDMAccess.java:118)
   at org.netbeans.modules.xml.xam.AbstractModel.endTransaction(AbstractModel.java:364)
   at org.netbeans.modules.xml.xam.AbstractModel.endTransaction(AbstractModel.java:350)
   at org.netbeans.modules.maven.customizer.CustomizerProviderImpl$OptionListener.actionPerformed(CustomizerProviderImpl.java:318)
   at org.netbeans.modules.project.uiapi.CustomizerDialog$OptionListener$1.run(CustomizerDialog.java:249)
   at org.openide.util.Mutex.writeAccess(Mutex.java:397)
   at org.netbeans.modules.project.uiapi.CustomizerDialog$OptionListener.actionPerformed(CustomizerDialog.java:247)
   at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
   at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
   at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
   at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
   at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
   at java.awt.Component.processMouseEvent(Component.java:6267)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
   at java.awt.Component.processEvent(Component.java:6032)
   at java.awt.Container.processEvent(Container.java:2041)
   at java.awt.Component.dispatchEventImpl(Component.java:4630)
   at java.awt.Container.dispatchEventImpl(Container.java:2099)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4577)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4238)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4168)
   at java.awt.Container.dispatchEventImpl(Container.java:2085)
   at java.awt.Window.dispatchEventImpl(Window.java:2478)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:137)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178)
   at java.awt.Dialog$1.run(Dialog.java:1046)
   at java.awt.Dialog$3.run(Dialog.java:1098)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.awt.Dialog.show(Dialog.java:1096)
   at org.netbeans.core.windows.services.NbPresenter.superShow(NbPresenter.java:1006)
   at org.netbeans.core.windows.services.NbPresenter.doShow(NbPresenter.java:1040)
   at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:1028)
   at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:121)
   at org.openide.util.Mutex.doEventAccess(Mutex.java:1361)
   at org.openide.util.Mutex.readAccess(Mutex.java:271)
   at org.netbeans.core.windows.services.NbPresenter.show(NbPresenter.java:1013)
   at java.awt.Component.show(Component.java:1563)
   at java.awt.Component.setVisible(Component.java:1515)
   at java.awt.Window.setVisible(Window.java:842)
   at java.awt.Dialog.setVisible(Dialog.java:986)
   at org.netbeans.modules.maven.customizer.CustomizerProviderImpl.showCustomizer(CustomizerProviderImpl.java:184)
   at org.netbeans.modules.maven.customizer.CustomizerProviderImpl.showCustomizer(CustomizerProviderImpl.java:141)
   at org.netbeans.modules.maven.customizer.CustomizerProviderImpl.showCustomizer(CustomizerProviderImpl.java:136)
   at org.netbeans.modules.project.ui.actions.CustomizeProject.actionPerformed(CustomizeProject.java:150)
   at org.netbeans.modules.project.ui.actions.LookupSensitiveAction.actionPerformed(LookupSensitiveAction.java:170)
   at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
   at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
   at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
   at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
   at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
   at javax.swing.AbstractButton.doClick(AbstractButton.java:337)
   at javax.swing.plaf.basic.BasicPopupMenuUI$BasicMenuKeyListener.menuKeyPressed(BasicPopupMenuUI.java:331)
   at javax.swing.JPopupMenu.fireMenuKeyPressed(JPopupMenu.java:1362)
   at javax.swing.JPopupMenu.processMenuKeyEvent(JPopupMenu.java:1341)
   at javax.swing.JPopupMenu.processKeyEvent(JPopupMenu.java:1325)
   at javax.swing.MenuSelectionManager.processKeyEvent(MenuSelectionManager.java:438)
   at org.netbeans.core.windows.ShortcutAndMenuKeyEventProcessor.dispatchKeyEvent(ShortcutAndMenuKeyEventProcessor.java:291)
   at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:983)
   at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:855)
   at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:676)
   at java.awt.Component.dispatchEventImpl(Component.java:4502)
   at java.awt.Container.dispatchEventImpl(Container.java:2099)
   at java.awt.Window.dispatchEventImpl(Window.java:2478)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:137)
   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)