java.lang.NullPointerException
   at org.netbeans.editor.Annotations.addAnnotation(Annotations.java:224)
   at org.netbeans.modules.editor.NbEditorDocument.addAnnotation(NbEditorDocument.java:244)
   at org.openide.text.NbDocument.addAnnotation(NbDocument.java:518)
   at org.openide.text.DocumentLine$Part$1.run(DocumentLine.java:744)
   at org.netbeans.editor.BaseDocument.render(BaseDocument.java:1391)
   at org.openide.text.DocumentLine$Part.addAnnotation(DocumentLine.java:738)
   at org.openide.text.Annotation.attach(Annotation.java:120)
   at org.netbeans.modules.editor.NbToolTip$Request.resolveTooltipText(NbToolTip.java:403)
   at org.netbeans.modules.editor.NbToolTip$Request.run(NbToolTip.java:365)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:419)
   at org.netbeans.modules.editor.NbToolTip.buildTip(NbToolTip.java:275)
   at org.netbeans.modules.editor.NbToolTip.buildToolTip(NbToolTip.java:117)
   at org.netbeans.modules.editor.NbEditorKit$NbBuildToolTipAction.actionPerformed(NbEditorKit.java:974)
   at org.netbeans.editor.BaseAction.actionPerformed(BaseAction.java:337)
   at org.netbeans.spi.editor.AbstractEditorAction.actionPerformed(AbstractEditorAction.java:462)
   at org.netbeans.editor.ext.ToolTipSupport.updateToolTip(ToolTipSupport.java:564)
   at org.netbeans.editor.ext.ToolTipSupport.setToolTipVisible(ToolTipSupport.java:627)
   at org.netbeans.editor.ext.ToolTipSupport.setToolTipVisible(ToolTipSupport.java:587)
   at org.netbeans.editor.ext.ToolTipSupport$Listener.actionPerformed(ToolTipSupport.java:1111)
   at org.netbeans.editor.WeakTimerListener.actionPerformed(WeakTimerListener.java:88)
   at javax.swing.Timer.fireActionPerformed(Timer.java:312)
   at javax.swing.Timer$DoPostEvent.run(Timer.java:244)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
   at java.awt.EventQueue.access$200(EventQueue.java:103)
   at java.awt.EventQueue$3.run(EventQueue.java:694)
   at java.awt.EventQueue$3.run(EventQueue.java:692)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)