java.lang.NullPointerException
        at org.netbeans.modules.editor.hints.AnnotationHolder.removeUpdate(AnnotationHolder.java:410)
        at org.netbeans.lib.editor.util.swing.PriorityDocumentListenerList.removeUpdate(PriorityDocumentListenerList.java:99)
        at javax.swing.text.AbstractDocument.fireRemoveUpdate(AbstractDocument.java:243)
        at org.netbeans.editor.BaseDocument.fireRemoveUpdate(BaseDocument.java:1626)
        at org.netbeans.editor.BaseDocument.remove(BaseDocument.java:925)
        at org.netbeans.modules.editor.guards.PositionBounds$1.run(PositionBounds.java:212)
        at org.netbeans.editor.GuardedDocument.runAtomic(GuardedDocument.java:324)
        at org.openide.text.NbDocument.runAtomic(NbDocument.java:411)
        at org.netbeans.modules.editor.guards.PositionBounds.setText(PositionBounds.java:245)
        at org.netbeans.modules.editor.guards.GuardedSectionImpl.setText(GuardedSectionImpl.java:178)
        at org.netbeans.modules.editor.guards.SimpleSectionImpl.setText(SimpleSectionImpl.java:73)
        at org.netbeans.api.editor.guards.SimpleSection.setText(SimpleSection.java:66)
        at org.netbeans.modules.form.JavaCodeGenerator.regenerateVariables(JavaCodeGenerator.java:1186)
        at org.netbeans.modules.form.RADComponentRenameRefactoringSupport.renameComponent(RADComponentRenameRefactoringSupport.java:181)
        at org.netbeans.modules.form.RADComponent.rename(RADComponent.java:534)
        at org.netbeans.modules.form.RADComponentNode.setName(RADComponentNode.java:356)
        at org.openide.explorer.view.TreeViewCellEditor.editingStopped(TreeViewCellEditor.java:138)
        at javax.swing.AbstractCellEditor.fireEditingStopped(AbstractCellEditor.java:125)
        at javax.swing.DefaultCellEditor$EditorDelegate.stopCellEditing(DefaultCellEditor.java:330)
        at javax.swing.DefaultCellEditor.stopCellEditing(DefaultCellEditor.java:215)
        at javax.swing.DefaultCellEditor$EditorDelegate.actionPerformed(DefaultCellEditor.java:347)
        at javax.swing.JTextField.fireActionPerformed(JTextField.java:492)
        at javax.swing.JTextField.postActionEvent(JTextField.java:705)
        at javax.swing.JTextField$NotifyAction.actionPerformed(JTextField.java:820)
        at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1636)
        at javax.swing.JComponent.processKeyBinding(JComponent.java:2849)
        at javax.swing.JComponent.processKeyBindings(JComponent.java:2884)
        at javax.swing.JComponent.processKeyEvent(JComponent.java:2812)
        at java.awt.Component.processEvent(Component.java:5818)
        at java.awt.Container.processEvent(Container.java:2058)
        at java.awt.Component.dispatchEventImpl(Component.java:4413)
        at java.awt.Container.dispatchEventImpl(Container.java:2116)
        at java.awt.Component.dispatchEvent(Component.java:4243)
        at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1848)
        at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:697)
        at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:962)
        at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:834)
        at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:661)
        at java.awt.Component.dispatchEventImpl(Component.java:4285)
        at java.awt.Container.dispatchEventImpl(Container.java:2116)
        at java.awt.Window.dispatchEventImpl(Window.java:2440)
        at java.awt.Component.dispatchEvent(Component.java:4243)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:117)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)