java.lang.NullPointerException
   at sun.font.FontDesignMetrics$MetricsKey.init(FontDesignMetrics.java:199)
   at sun.font.FontDesignMetrics.getMetrics(FontDesignMetrics.java:267)
   at sun.swing.SwingUtilities2.getFontMetrics(SwingUtilities2.java:949)
   at javax.swing.JComponent.getFontMetrics(JComponent.java:1599)
   at org.netbeans.editor.FontMetricsCache.getFontMetrics(FontMetricsCache.java:77)
   at org.netbeans.editor.EditorUI.computeLineNumberDigitWidth(EditorUI.java:1516)
   at org.netbeans.editor.EditorUI.updateComponentProperties(EditorUI.java:827)
   at org.netbeans.editor.EditorUI$Listener$1.run(EditorUI.java:1641)
   at org.netbeans.editor.Utilities.runInEventDispatchThread(Utilities.java:1045)
   at org.netbeans.editor.EditorUI$Listener.preferenceChange(EditorUI.java:1637)
   at org.netbeans.editor.EditorUI.modelChanged(EditorUI.java:563)
   at org.netbeans.editor.EditorUI.propertyChange(EditorUI.java:598)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
   at java.awt.Component.firePropertyChange(Component.java:8239)
   at org.openide.text.QuietEditorPane.firePropertyChange(QuietEditorPane.java:209)
   at javax.swing.text.JTextComponent.setDocument(JTextComponent.java:437)
   at org.openide.text.QuietEditorPane.setDocument(QuietEditorPane.java:162)
   at org.openide.text.CloneableEditor$DoInitialize.initDocument(CloneableEditor.java:742)
   at org.openide.text.CloneableEditor$DoInitialize.initVisual(CloneableEditor.java:756)
   at org.openide.text.CloneableEditor.getEditorPane(CloneableEditor.java:1281)
   at org.netbeans.core.spi.multiview.text.MultiViewCloneableEditor.getToolbarRepresentation(MultiViewCloneableEditor.java:91)
   at org.netbeans.core.spi.multiview.text.MultiViewEditorElement.getToolbarRepresentation(MultiViewEditorElement.java:109)
   at org.netbeans.core.multiview.MultiViewPeer.peerComponentShowing(MultiViewPeer.java:262)
   at org.netbeans.core.multiview.MultiViewCloneableTopComponent.componentShowing(MultiViewCloneableTopComponent.java:125)
   at org.openide.windows.WindowManager.componentShowing(WindowManager.java:339)
   at org.netbeans.core.windows.WindowManagerImpl.componentShowing(WindowManagerImpl.java:1157)
   at org.netbeans.core.windows.view.DefaultView.changeGUI(DefaultView.java:168)
   at org.netbeans.core.windows.ViewRequestor.dispatchRequest(ViewRequestor.java:273)
   at org.netbeans.core.windows.ViewRequestor.processRequest(ViewRequestor.java:249)
   at org.netbeans.core.windows.ViewRequestor.postRequest(ViewRequestor.java:187)
   at org.netbeans.core.windows.ViewRequestor.scheduleRequest(ViewRequestor.java:127)
   at org.netbeans.core.windows.Central.activateModeTopComponent(Central.java:1760)
   at org.netbeans.core.windows.WindowManagerImpl.topComponentRequestActive(WindowManagerImpl.java:1291)
   at org.openide.windows.TopComponent.requestActive(TopComponent.java:868)
   at org.openide.windows.CloneableOpenSupport$1.run(CloneableOpenSupport.java:102)
   at org.openide.util.Mutex.doEvent(Mutex.java:1341)
   at org.openide.util.Mutex.writeAccess(Mutex.java:455)
   at org.openide.windows.CloneableOpenSupport.open(CloneableOpenSupport.java:98)
   at org.openide.text.CloneableEditorSupport.open(CloneableEditorSupport.java:507)
   at org.openide.actions.OpenAction.performAction(OpenAction.java:84)
   at org.openide.util.actions.NodeAction$DelegateAction$1.run(NodeAction.java:586)
   at org.openide.util.actions.ActionInvoker$1.run(ActionInvoker.java:95)
   at org.openide.util.actions.ActionInvoker.doPerformAction(ActionInvoker.java:116)
   at org.openide.util.actions.ActionInvoker.invokeAction(ActionInvoker.java:99)
   at org.openide.util.actions.NodeAction$DelegateAction.actionPerformed(NodeAction.java:583)
   at org.openide.explorer.view.TreeView$PopupSupport.mouseClicked(TreeView.java:1629)
   at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:253)
   at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:252)
   at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:252)
   at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:252)
   at java.awt.Component.processMouseEvent(Component.java:6376)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
   at java.awt.Component.processEvent(Component.java:6138)
   at java.awt.Container.processEvent(Container.java:2085)
   at java.awt.Component.dispatchEventImpl(Component.java:4735)
   at java.awt.Container.dispatchEventImpl(Container.java:2143)
   at java.awt.Component.dispatchEvent(Component.java:4565)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4621)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4291)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4212)
   at java.awt.Container.dispatchEventImpl(Container.java:2129)
   at java.awt.Window.dispatchEventImpl(Window.java:2478)
   at java.awt.Component.dispatchEvent(Component.java:4565)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:679)
   at java.awt.EventQueue.access$000(EventQueue.java:85)
   at java.awt.EventQueue$1.run(EventQueue.java:638)
   at java.awt.EventQueue$1.run(EventQueue.java:636)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
   at java.awt.EventQueue$2.run(EventQueue.java:652)
   at java.awt.EventQueue$2.run(EventQueue.java:650)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:649)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:153)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)