java.lang.Throwable: Locked by:
   at org.openide.filesystems.FileLock.<init>(FileLock.java:88)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.LockForFile.<init>(LockForFile.java:92)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.LockForFile.tryLock(LockForFile.java:103)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObj.lock(FileObj.java:409)
   at org.openide.loaders.MultiDataObject$Entry.takeLock(MultiDataObject.java:1397)
   at org.netbeans.modules.openide.loaders.SimpleES$Environment.takeLock(SimpleES.java:188)
   at org.openide.text.DataEditorSupport$Env.outputStream(DataEditorSupport.java:903)
   at org.openide.text.CloneableEditorSupport.saveDocumentImpl(CloneableEditorSupport.java:774)
   at org.openide.text.CloneableEditorSupport.saveDocument(CloneableEditorSupport.java:644)
   at org.openide.text.DataEditorSupport.superSaveDoc(DataEditorSupport.java:607)
   at org.openide.text.DataEditorSupport$SaveImpl.run(DataEditorSupport.java:1378)
   at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:127)
   at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:519)
   at org.openide.filesystems.FileUtil.runAtomicAction(FileUtil.java:420)
   at org.openide.text.DataEditorSupport.saveDocument(DataEditorSupport.java:603)
   at org.netbeans.modules.openide.loaders.SimpleES$SaveCookieImpl.save(SimpleES.java:226)
   at org.netbeans.core.NbLifecycleManager.saveAll(NbLifecycleManager.java:97)
   at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:470)
   at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:153)