java.io.IOException
        at org.netbeans.api.java.source.ModificationResult.processDocument(ModificationResult.java:356)
        at org.netbeans.api.java.source.ModificationResult.commit2(ModificationResult.java:325)
        at org.netbeans.api.java.source.ModificationResult.access$000(ModificationResult.java:83)
        at org.netbeans.api.java.source.ModificationResult$2.run(ModificationResult.java:230)
        at org.netbeans.editor.GuardedDocument.runAtomic(GuardedDocument.java:324)
        at org.openide.text.NbDocument.runAtomic(NbDocument.java:384)
        at org.netbeans.api.java.source.ModificationResult.commit(ModificationResult.java:227)
        at org.netbeans.api.java.source.ModificationResult.commit(ModificationResult.java:191)
        at org.netbeans.modules.editor.java.JavaCompletionItem$OverrideMethodItem.substituteText(JavaCompletionItem.java:1521)
        at org.netbeans.modules.editor.java.JavaCompletionItem.defaultAction(JavaCompletionItem.java:249)
        at org.netbeans.modules.editor.completion.CompletionImpl.dispatchKeyEvent(CompletionImpl.java:581)
        at org.netbeans.modules.editor.completion.CompletionImpl.keyPressed(CompletionImpl.java:367)
        at java.awt.AWTEventMulticaster.keyPressed(AWTEventMulticaster.java:233)
        at java.awt.AWTEventMulticaster.keyPressed(AWTEventMulticaster.java:232)
        at java.awt.Component.processKeyEvent(Component.java:6092)
        at javax.swing.JComponent.processKeyEvent(JComponent.java:2799)
        at java.awt.Component.processEvent(Component.java:5911)
        at java.awt.Container.processEvent(Container.java:2023)
        at java.awt.Component.dispatchEventImpl(Component.java:4501)
        at java.awt.Container.dispatchEventImpl(Container.java:2081)
        at java.awt.Component.dispatchEvent(Component.java:4331)
        at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1848)
        at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:704)
        at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:969)
        at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:841)
        at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:668)
        at java.awt.Component.dispatchEventImpl(Component.java:4373)
        at java.awt.Container.dispatchEventImpl(Container.java:2081)
        at java.awt.Window.dispatchEventImpl(Window.java:2458)
        at java.awt.Component.dispatchEvent(Component.java:4331)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
org.netbeans.editor.GuardedException: Attempt to remove from guarded block at position 12,117.
        at org.netbeans.editor.GuardedDocument.preRemoveCheck(GuardedDocument.java:287)
        at org.netbeans.editor.BaseDocument.remove(BaseDocument.java:882)
        at org.netbeans.api.java.source.ModificationResult.processDocumentLocked(ModificationResult.java:371)
        at org.netbeans.api.java.source.ModificationResult.access$100(ModificationResult.java:83)
        at org.netbeans.api.java.source.ModificationResult$3.run(ModificationResult.java:340)
        at org.netbeans.editor.GuardedDocument.runAtomicAsUser(GuardedDocument.java:354)
        at org.openide.text.NbDocument.runAtomicAsUser(NbDocument.java:410)
        at org.netbeans.api.java.source.ModificationResult.processDocument(ModificationResult.java:350)
        at org.netbeans.api.java.source.ModificationResult.commit2(ModificationResult.java:325)
        at org.netbeans.api.java.source.ModificationResult.access$000(ModificationResult.java:83)
        at org.netbeans.api.java.source.ModificationResult$2.run(ModificationResult.java:230)
        at org.netbeans.editor.GuardedDocument.runAtomic(GuardedDocument.java:324)
        at org.openide.text.NbDocument.runAtomic(NbDocument.java:384)
        at org.netbeans.api.java.source.ModificationResult.commit(ModificationResult.java:227)
        at org.netbeans.api.java.source.ModificationResult.commit(ModificationResult.java:191)
        at org.netbeans.modules.editor.java.JavaCompletionItem$OverrideMethodItem.substituteText(JavaCompletionItem.java:1521)
        at org.netbeans.modules.editor.java.JavaCompletionItem.defaultAction(JavaCompletionItem.java:249)
        at org.netbeans.modules.editor.completion.CompletionImpl.dispatchKeyEvent(CompletionImpl.java:581)
        at org.netbeans.modules.editor.completion.CompletionImpl.keyPressed(CompletionImpl.java:367)
        at java.awt.AWTEventMulticaster.keyPressed(AWTEventMulticaster.java:233)
        at java.awt.AWTEventMulticaster.keyPressed(AWTEventMulticaster.java:232)
        at java.awt.Component.processKeyEvent(Component.java:6092)
        at javax.swing.JComponent.processKeyEvent(JComponent.java:2799)
        at java.awt.Component.processEvent(Component.java:5911)
        at java.awt.Container.processEvent(Container.java:2023)
        at java.awt.Component.dispatchEventImpl(Component.java:4501)
        at java.awt.Container.dispatchEventImpl(Container.java:2081)
        at java.awt.Component.dispatchEvent(Component.java:4331)
        at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1848)
        at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:704)
        at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:969)
        at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:841)
        at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:668)
        at java.awt.Component.dispatchEventImpl(Component.java:4373)
        at java.awt.Container.dispatchEventImpl(Container.java:2081)
        at java.awt.Window.dispatchEventImpl(Window.java:2458)
        at java.awt.Component.dispatchEvent(Component.java:4331)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)