java.util.ConcurrentModificationException
        at java.util.Hashtable$Enumerator.next(Hashtable.java:1031)
        at com.sun.java.swing.plaf.nimbus.NimbusStyle.compileDefaults(NimbusStyle.java:378)
        at com.sun.java.swing.plaf.nimbus.NimbusStyle.validate(NimbusStyle.java:297)
        at com.sun.java.swing.plaf.nimbus.NimbusStyle.getValues(NimbusStyle.java:927)
        at com.sun.java.swing.plaf.nimbus.NimbusStyle.getInsets(NimbusStyle.java:605)
        at javax.swing.plaf.synth.SynthStyle.installDefaults(SynthStyle.java:896)
        at javax.swing.plaf.synth.SynthLookAndFeel.updateStyle(SynthLookAndFeel.java:276)
        at javax.swing.plaf.synth.SynthRootPaneUI.updateStyle(SynthRootPaneUI.java:64)
        at javax.swing.plaf.synth.SynthRootPaneUI.installDefaults(SynthRootPaneUI.java:33)
        at javax.swing.plaf.basic.BasicRootPaneUI.installUI(BasicRootPaneUI.java:39)
        at javax.swing.JComponent.setUI(JComponent.java:673)
        at javax.swing.JRootPane.setUI(JRootPane.java:456)
        at javax.swing.JRootPane.updateUI(JRootPane.java:466)
        at javax.swing.JRootPane.<init>(JRootPane.java:353)
        at javax.swing.JFrame.createRootPane(JFrame.java:260)
        at javax.swing.JFrame.frameInit(JFrame.java:241)
        at javax.swing.JFrame.<init>(JFrame.java:164)
        at org.netbeans.core.windows.view.ui.MainWindow.<init>(MainWindow.java:104)
        at org.netbeans.core.windows.view.ViewHierarchy.getMainWindow(ViewHierarchy.java:124)
        at org.netbeans.core.windows.view.DefaultView.getMainWindow(DefaultView.java:100)
        at org.netbeans.core.windows.ViewRequestor.getMainWindow(ViewRequestor.java:102)
        at org.netbeans.core.windows.Central.getMainWindow(Central.java:1791)
        at org.netbeans.core.windows.WindowManagerImpl.getMainWindow(WindowManagerImpl.java:159)
        at org.netbeans.core.windows.actions.ToggleFullScreenAction.isEnabled(ToggleFullScreenAction.java:134)
        at javax.swing.AbstractAction.setEnabledFromAction(AbstractAction.java:85)
        at javax.swing.AbstractButton.configurePropertiesFromAction(AbstractButton.java:1145)
        at javax.swing.JMenuItem.configurePropertiesFromAction(JMenuItem.java:359)
        at javax.swing.AbstractButton.setAction(AbstractButton.java:1087)
        at javax.swing.JCheckBoxMenuItem.<init>(JCheckBoxMenuItem.java:116)
        at org.netbeans.core.windows.actions.ToggleFullScreenAction.createItems(ToggleFullScreenAction.java:112)
        at org.netbeans.core.windows.actions.ToggleFullScreenAction.access$100(ToggleFullScreenAction.java:66)
        at org.netbeans.core.windows.actions.ToggleFullScreenAction$1.propertyChange(ToggleFullScreenAction.java:77)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
        at org.openide.util.SharedClassObject.firePropertyChange(SharedClassObject.java:454)
        at org.openide.util.SharedClassObject.putProperty(SharedClassObject.java:329)
        at org.openide.util.actions.SystemAction.putValue(SystemAction.java:158)
        at org.netbeans.core.NbKeymap$1.run(NbKeymap.java:297)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        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)