java.lang.IllegalStateException: atomicUnlock() without atomicLock()
        at org.netbeans.editor.BaseDocument.atomicUnlockImpl(BaseDocument.java:1067)
        at org.netbeans.editor.BaseDocument.atomicUnlock(BaseDocument.java:1061)
        at org.netbeans.editor.BaseDocument.runAtomicAsUser(BaseDocument.java:914)
        at org.netbeans.editor.GuardedDocument.runAtomic(GuardedDocument.java:217)
        at org.openide.text.NbDocument.runAtomic(NbDocument.java:329)
        at org.netbeans.modules.java.parser.SourceImplProxy$2.run(SourceImplProxy.java:240)
        at org.netbeans.modules.java.model.DefaultLangModel.runAtomic(DefaultLangModel.java:472)
        at org.netbeans.modules.java.parser.SourceImplProxy.runAtomicAsUser(SourceImplProxy.java:236)
        at org.openide.src.SourceElement.runAtomicAsUser(SourceElement.java:287)
        at org.openide.src.nodes.SourceEditSupport.runAsUser(SourceEditSupport.java:299)
        at org.openide.src.nodes.MethodCustomizer.returnComboActionPerformed(MethodCustomizer.java:281)
        at org.openide.src.nodes.MethodCustomizer.access$200(MethodCustomizer.java:39)
        at org.openide.src.nodes.MethodCustomizer$3.actionPerformed(MethodCustomizer.java:216)
        at javax.swing.JComboBox.fireActionEvent(JComboBox.java:1196)
        at javax.swing.JComboBox.setSelectedItem(JComboBox.java:561)
        at javax.swing.JComboBox.setSelectedIndex(JComboBox.java:597)
        at javax.swing.plaf.basic.BasicComboPopup$ListMouseHandler.mouseReleased(BasicComboPopup.java:749)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:228)
        at java.awt.Component.processMouseEvent(Component.java:5093)
        at javax.swing.plaf.basic.BasicComboPopup$2.processMouseEvent(BasicComboPopup.java:452)
        at java.awt.Component.processEvent(Component.java:4890)
        at java.awt.Container.processEvent(Container.java:1566)
        at java.awt.Component.dispatchEventImpl(Component.java:3598)
        at java.awt.Container.dispatchEventImpl(Container.java:1623)
        at java.awt.Component.dispatchEvent(Component.java:3439)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3450)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3165)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3095)
        at java.awt.Container.dispatchEventImpl(Container.java:1609)
        at java.awt.Window.dispatchEventImpl(Window.java:1585)
        at java.awt.Component.dispatchEvent(Component.java:3439)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)
[catch] at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:140)
        at java.awt.Dialog.show(Dialog.java:538)
        at org.netbeans.core.NbPresenter.superShow(NbPresenter.java:690)
        at org.netbeans.core.NbPresenter.doShow(NbPresenter.java:733)
        at org.netbeans.core.NbPresenter.run(NbPresenter.java:721)
        at org.openide.util.Mutex.doEventAccess(Mutex.java:932)
        at org.openide.util.Mutex.readAccess(Mutex.java:157)
        at org.netbeans.core.NbPresenter.show(NbPresenter.java:706)
        at org.netbeans.core.NbNodeOperation$2.run(NbNodeOperation.java:166)
        at org.openide.util.Mutex$1.run(Mutex.java:952)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:171)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:448)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)
==>
org.netbeans.editor.GuardedException: Attempt to insert into guarded block at position 1á064.
        at org.netbeans.editor.GuardedDocument.preInsertCheck(GuardedDocument.java:145)
        at org.netbeans.editor.BaseDocument.insertString(BaseDocument.java:547)
        at org.openide.text.PositionBounds$1.run(PositionBounds.java:84)
        at org.netbeans.editor.BaseDocument.runAtomicAsUser(BaseDocument.java:906)
        at org.netbeans.editor.GuardedDocument.runAtomic(GuardedDocument.java:217)
        at org.openide.text.NbDocument.runAtomic(NbDocument.java:329)
        at org.openide.text.PositionBounds.setText(PositionBounds.java:108)
        at org.netbeans.modules.java.codegen.CodeGenerator.fillTextBounds(CodeGenerator.java:106)
        at org.netbeans.modules.java.codegen.ElementBinding$PartialGenerator.run(ElementBinding.java:480)
        at org.netbeans.modules.java.codegen.SourceText$1.run(SourceText.java:239)
        at org.netbeans.editor.BaseDocument.runAtomicAsUser(BaseDocument.java:906)
        at org.netbeans.editor.GuardedDocument.runAtomicAsUser(GuardedDocument.java:237)
        at org.openide.text.NbDocument.runAtomicAsUser(NbDocument.java:353)
        at org.netbeans.modules.java.codegen.SourceText.runAtomic(SourceText.java:251)
        at org.netbeans.modules.java.codegen.ElementBinding.regenerateHeader(ElementBinding.java:346)
        at org.netbeans.modules.java.codegen.Method.changeReturnType(Method.java:116)
        at org.netbeans.modules.java.model.MethodElementImpl.setReturn(MethodElementImpl.java:89)
        at org.openide.src.MethodElement.setReturn(MethodElement.java:71)
        at org.openide.src.nodes.MethodCustomizer$4.run(MethodCustomizer.java:283)
        at org.openide.src.nodes.SourceEditSupport$2.run(SourceEditSupport.java:302)
        at org.netbeans.editor.BaseDocument.runAtomicAsUser(BaseDocument.java:906)
        at org.netbeans.editor.GuardedDocument.runAtomic(GuardedDocument.java:217)
        at org.openide.text.NbDocument.runAtomic(NbDocument.java:329)
        at org.netbeans.modules.java.parser.SourceImplProxy$2.run(SourceImplProxy.java:240)
        at org.netbeans.modules.java.model.DefaultLangModel.runAtomic(DefaultLangModel.java:472)
        at org.netbeans.modules.java.parser.SourceImplProxy.runAtomicAsUser(SourceImplProxy.java:236)
        at org.openide.src.SourceElement.runAtomicAsUser(SourceElement.java:287)
        at org.openide.src.nodes.SourceEditSupport.runAsUser(SourceEditSupport.java:299)
        at org.openide.src.nodes.MethodCustomizer.returnComboActionPerformed(MethodCustomizer.java:281)
        at org.openide.src.nodes.MethodCustomizer.access$200(MethodCustomizer.java:39)
        at org.openide.src.nodes.MethodCustomizer$3.actionPerformed(MethodCustomizer.java:216)
        at javax.swing.JComboBox.fireActionEvent(JComboBox.java:1196)
        at javax.swing.JComboBox.setSelectedItem(JComboBox.java:561)
        at javax.swing.JComboBox.setSelectedIndex(JComboBox.java:597)
        at javax.swing.plaf.basic.BasicComboPopup$ListMouseHandler.mouseReleased(BasicComboPopup.java:749)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:228)
        at java.awt.Component.processMouseEvent(Component.java:5093)
        at javax.swing.plaf.basic.BasicComboPopup$2.processMouseEvent(BasicComboPopup.java:452)
        at java.awt.Component.processEvent(Component.java:4890)
        at java.awt.Container.processEvent(Container.java:1566)
        at java.awt.Component.dispatchEventImpl(Component.java:3598)
        at java.awt.Container.dispatchEventImpl(Container.java:1623)
        at java.awt.Component.dispatchEvent(Component.java:3439)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3450)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3165)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3095)
        at java.awt.Container.dispatchEventImpl(Container.java:1609)
        at java.awt.Window.dispatchEventImpl(Window.java:1585)
        at java.awt.Component.dispatchEvent(Component.java:3439)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)
[catch] at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:140)
        at java.awt.Dialog.show(Dialog.java:538)
        at org.netbeans.core.NbPresenter.superShow(NbPresenter.java:690)
        at org.netbeans.core.NbPresenter.doShow(NbPresenter.java:733)
        at org.netbeans.core.NbPresenter.run(NbPresenter.java:721)
        at org.openide.util.Mutex.doEventAccess(Mutex.java:932)
        at org.openide.util.Mutex.readAccess(Mutex.java:157)
        at org.netbeans.core.NbPresenter.show(NbPresenter.java:706)
        at org.netbeans.core.NbNodeOperation$2.run(NbNodeOperation.java:166)
        at org.openide.util.Mutex$1.run(Mutex.java:952)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:171)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:448)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)