java.lang.Throwable: Locked by:
        at org.openide.filesystems.FileLock.<init>(FileLock.java:83)
        at org.netbeans.modules.masterfs.filebasedfs.fileobjects.LockForFile.<init>(LockForFile.java:91)
        at org.netbeans.modules.masterfs.filebasedfs.fileobjects.LockForFile.tryLock(LockForFile.java:102)
        at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObj.lock(FileObj.java:331)
        at org.openide.loaders.MultiDataObject$Entry.takeLock(MultiDataObject.java:1192)
        at org.openide.loaders.DefaultES$Environment.takeLock(DefaultES.java:169)
        at org.openide.text.DataEditorSupport$Env.markModified(DataEditorSupport.java:857)
        at org.openide.text.CloneableEditorSupport.notifyModified(CloneableEditorSupport.java:1930)
        at org.openide.loaders.DefaultES.notifyModified(DefaultES.java:100)
        at org.openide.text.CloneableEditorSupport.callNotifyModified(CloneableEditorSupport.java:1898)
        at org.openide.text.CloneableEditorSupport$Listener.insertUpdate(CloneableEditorSupport.java:2872)
        at javax.swing.text.AbstractDocument.fireInsertUpdate(AbstractDocument.java:185)
        at javax.swing.text.AbstractDocument.handleInsertString(AbstractDocument.java:734)
        at javax.swing.text.AbstractDocument.insertString(AbstractDocument.java:693)
        at javax.swing.text.PlainDocument.insertString(PlainDocument.java:114)
        at org.openide.text.FilterDocument.insertString(FilterDocument.java:118)
        at javax.swing.text.JTextComponent.replaceSelection(JTextComponent.java:1358)
        at javax.swing.JEditorPane.replaceSelection(JEditorPane.java:1202)
        at javax.swing.text.DefaultEditorKit$DefaultKeyTypedAction.actionPerformed(DefaultEditorKit.java:859)
        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:5877)
        at java.awt.Container.processEvent(Container.java:2058)
        at java.awt.Component.dispatchEventImpl(Component.java:4472)
        at java.awt.Container.dispatchEventImpl(Container.java:2116)
        at java.awt.Component.dispatchEvent(Component.java:4302)
        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:4344)
        at java.awt.Container.dispatchEventImpl(Container.java:2116)
Caused: org.openide.filesystems.FileAlreadyLockedException: /tmp/test.txt
        at org.netbeans.modules.masterfs.filebasedfs.fileobjects.LockForFile.registerLock(LockForFile.java:114)
        at org.netbeans.modules.masterfs.filebasedfs.fileobjects.LockForFile.tryLock(LockForFile.java:103)
        at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObj.lock(FileObj.java:331)
        at org.openide.filesystems.FileObject.getOutputStream(FileObject.java:685)
        at test.Test.actionPerformed(Test.java:20)
        at org.openide.awt.AlwaysEnabledAction$1.run(AlwaysEnabledAction.java:137)
        at org.openide.util.actions.ActionInvoker$1.run(ActionInvoker.java:95)
        at org.openide.util.actions.ActionInvoker.doPerformAction(ActionInvoker.java:116)
        at org.openide.util.actions.ActionInvoker.invokeAction(ActionInvoker.java:99)
        at org.openide.awt.AlwaysEnabledAction.actionPerformed(AlwaysEnabledAction.java:140)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
        at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1220)
        at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1261)
        at java.awt.Component.processMouseEvent(Component.java:6100)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
        at java.awt.Component.processEvent(Component.java:5865)
        at java.awt.Container.processEvent(Container.java:2058)
        at java.awt.Component.dispatchEventImpl(Component.java:4472)
        at java.awt.Container.dispatchEventImpl(Container.java:2116)
        at java.awt.Component.dispatchEvent(Component.java:4302)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
        at java.awt.Container.dispatchEventImpl(Container.java:2102)
        at java.awt.Window.dispatchEventImpl(Window.java:2440)
        at java.awt.Component.dispatchEvent(Component.java:4302)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:137)
        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)
[catch] at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)