java.lang.NullPointerException at org.netbeans.modules.editor.lib2.view.DocumentView.updateStartEndOffsets(DocumentView.java:657) at org.netbeans.modules.editor.lib2.view.DocumentView.setParent(DocumentView.java:622) at javax.swing.plaf.basic.BasicTextUI$RootView.setView(BasicTextUI.java:1330) at javax.swing.plaf.basic.BasicTextUI.setView(BasicTextUI.java:695) at org.netbeans.editor.BaseTextUI.modelChanged(BaseTextUI.java:179) at javax.swing.plaf.basic.BasicTextUI$UpdateHandler.propertyChange(BasicTextUI.java:1788) 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:8382) at javax.swing.text.JTextComponent.setDocument(JTextComponent.java:453) at org.netbeans.modules.diff.builtin.visualizer.editable.EditableDiffView$TextualDiffRefreshTask$1.run(EditableDiffView.java:1196) 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)