org.openide.filesystems.FileAlreadyLockedException: Z:\Netbeans\OIT\OIT\CMAIS\src\com\bbraun\cmais\CMAIS.java
   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:337)
   at org.openide.filesystems.FileObject.getOutputStream(FileObject.java:699)
   at org.netbeans.modules.refactoring.spi.BackupFacility$DefaultImpl.copy(BackupFacility.java:277)
   at org.netbeans.modules.refactoring.spi.BackupFacility$DefaultImpl.restore(BackupFacility.java:236)
   at org.netbeans.modules.refactoring.spi.BackupFacility$DefaultHandle.restore(BackupFacility.java:173)
Caused: java.lang.RuntimeException
   at org.netbeans.modules.refactoring.java.plugins.RetoucheCommit.rollback(RetoucheCommit.java:116)
   at org.netbeans.modules.refactoring.api.RefactoringSession.undoRefactoring(RefactoringSession.java:173)
   at org.netbeans.modules.refactoring.spi.impl.UndoManager$SessionUndoItem.undo(UndoManager.java:600)
   at org.netbeans.modules.refactoring.spi.impl.UndoManager.undo(UndoManager.java:224)
   at org.netbeans.modules.refactoring.spi.impl.UndoAction.performAction(UndoAction.java:99)
   at org.openide.util.actions.CallableSystemAction$1.run(CallableSystemAction.java:129)
   at org.openide.util.actions.ActionInvoker$1.run(ActionInvoker.java:95)
   at org.openide.util.actions.ActionInvoker$ActionRunnable.actionPerformed(ActionInvoker.java:162)
   at org.netbeans.core.ModuleActions.invokeAction(ModuleActions.java:109)
   at org.netbeans.modules.openide.actions.ActionsBridgeImpl.invokeAction(ActionsBridgeImpl.java:60)
   at org.openide.util.actions.ActionInvoker$ActionRunnable.doRun(ActionInvoker.java:153)
   at org.openide.util.actions.ActionInvoker$2.run(ActionInvoker.java:110)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1424)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1968)