java.lang.NullPointerException
   at sun.font.FontDesignMetrics$MetricsKey.init(FontDesignMetrics.java:217)
   at sun.font.FontDesignMetrics.getMetrics(FontDesignMetrics.java:286)
   at sun.swing.SwingUtilities2.getFontMetrics(SwingUtilities2.java:1012)
   at javax.swing.JComponent.getFontMetrics(JComponent.java:1624)
   at org.netbeans.editor.FontMetricsCache.getFontMetrics(FontMetricsCache.java:77)
   at org.netbeans.editor.EditorUI.computeLineNumberDigitWidth(EditorUI.java:1516)
   at org.netbeans.editor.EditorUI.updateComponentProperties(EditorUI.java:827)
   at org.netbeans.editor.EditorUI$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.fire(PropertyChangeSupport.java:335)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:327)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:263)
   at java.awt.Component.firePropertyChange(Component.java:8381)
   at org.openide.text.QuietEditorPane.firePropertyChange(QuietEditorPane.java:209)
   at javax.swing.text.JTextComponent.setDocument(JTextComponent.java:453)
   at org.openide.text.QuietEditorPane.setDocument(QuietEditorPane.java:162)
   at org.openide.text.CloneableEditor$DoInitialize.initDocument(CloneableEditor.java:732)
   at org.openide.text.CloneableEditor$DoInitialize.initVisual(CloneableEditor.java:746)
   at org.openide.text.CloneableEditor$DoInitialize.run(CloneableEditor.java:386)
   at org.netbeans.core.windows.WindowManagerImpl$Exclusive$1.run(WindowManagerImpl.java:1485)
   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:153)
   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)