java.lang.IllegalStateException: Too many org.netbeans.modules.xml.schema.SchemaEditorSupport$4 (3) in shared RequestProcessor; create your own
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:424)
   at org.netbeans.modules.xml.schema.SchemaEditorSupport.syncModel(SchemaEditorSupport.java:610)
   at org.netbeans.modules.xml.schema.multiview.SchemaSourceMultiViewElement.componentHidden(SchemaSourceMultiViewElement.java:328)
   at org.netbeans.core.multiview.MultiViewPeer.hideElement(MultiViewPeer.java:337)
   at org.netbeans.core.multiview.MultiViewPeer$SelectionListener.selectionChanged(MultiViewPeer.java:746)
   at org.netbeans.core.multiview.MultiViewModel.fireSelectionChanged(MultiViewModel.java:246)
   at org.netbeans.core.multiview.MultiViewModel.setActiveDescription(MultiViewModel.java:118)
   at org.netbeans.core.multiview.MultiViewModel$BtnGroup.setSelected(MultiViewModel.java:296)
   at javax.swing.JToggleButton$ToggleButtonModel.setSelected(JToggleButton.java:254)
   at javax.swing.ButtonGroup.setSelected(ButtonGroup.java:164)
   at org.netbeans.core.multiview.MultiViewModel$BtnGroup.setSelected(MultiViewModel.java:292)
   at javax.swing.JToggleButton$ToggleButtonModel.setSelected(JToggleButton.java:254)
   at javax.swing.AbstractButton.setSelected(AbstractButton.java:348)
   at org.netbeans.core.multiview.TabsComponent.changeActiveManually(TabsComponent.java:212)
   at org.netbeans.core.multiview.MultiViewPeer$MVTCHandler.requestActive(MultiViewPeer.java:774)
   at org.netbeans.core.api.multiview.MultiViewHandler.requestActive(MultiViewHandler.java:98)
   at org.netbeans.modules.xml.schema.multiview.SchemaMultiViewSupport.requestMultiviewActive(SchemaMultiViewSupport.java:178)
   at org.netbeans.modules.xml.schema.multiview.SchemaMultiViewSupport.viewInSwingThread(SchemaMultiViewSupport.java:260)
   at org.netbeans.modules.xml.schema.multiview.SchemaMultiViewSupport.view(SchemaMultiViewSupport.java:231)
   at org.netbeans.modules.xml.schema.actions.SchemaViewOpenAction$1.run(SchemaViewOpenAction.java:93)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705)
   at java.awt.EventQueue.access$000(EventQueue.java:101)
   at java.awt.EventQueue$3.run(EventQueue.java:666)
   at java.awt.EventQueue$3.run(EventQueue.java:664)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:675)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:158)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)