java.lang.RuntimeException
        at org.netbeans.modules.refactoring.java.plugins.RetoucheCommit.rollback(RetoucheCommit.java:100)
        at org.netbeans.modules.refactoring.api.RefactoringSession.undoRefactoring(RefactoringSession.java:163)
        at org.netbeans.modules.refactoring.spi.impl.UndoManager$SessionUndoItem.undo(UndoManager.java:596)
        at org.netbeans.modules.refactoring.spi.impl.UndoManager.undo(UndoManager.java:221)
        at org.netbeans.modules.refactoring.spi.impl.UndoAction.performAction(UndoAction.java:96)
        at org.openide.util.actions.CallableSystemAction$.run(CallableSystemAction.java:118)
        at org.netbeans.modules.openide.util.ActionsBridge$ActionRunnable.actionPerformed(ActionsBridge.java:111)
        at org.netbeans.core.ModuleActions.invokeAction(ModuleActions.java:104)
        at org.netbeans.modules.openide.actions.ActionsBridgeImpl.invokeAction(ActionsBridgeImpl.java:52)
        at org.netbeans.modules.openide.util.ActionsBridge$ActionRunnable.doRun(ActionsBridge.java:102)
        at org.netbeans.modules.openide.util.ActionsBridge$.run(ActionsBridge.java:71)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997)
org.openide.filesystems.FileAlreadyLockedException: C:\Users\Sunbon\Documents\NetBeansProjects\CdcApplication\src\cdcapplication\Main.java
        at org.netbeans.modules.masterfs.filebasedfs.fileobjects.LockForFile.registerLock(LockForFile.java:107)
        at org.netbeans.modules.masterfs.filebasedfs.fileobjects.LockForFile.tryLock(LockForFile.java:96)
        at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObj.lock(FileObj.java:277)
        at org.openide.filesystems.FileObject.getOutputStream(FileObject.java:521)
        at org.netbeans.modules.refactoring.spi.BackupFacility$DefaultImpl.copy(BackupFacility.java:272)
        at org.netbeans.modules.refactoring.spi.BackupFacility$DefaultImpl.restore(BackupFacility.java:231)
        at org.netbeans.modules.refactoring.spi.BackupFacility$DefaultHandle.restore(BackupFacility.java:168)
        at org.netbeans.modules.refactoring.java.plugins.RetoucheCommit.rollback(RetoucheCommit.java:98)
        at org.netbeans.modules.refactoring.api.RefactoringSession.undoRefactoring(RefactoringSession.java:163)
        at org.netbeans.modules.refactoring.spi.impl.UndoManager$SessionUndoItem.undo(UndoManager.java:596)
        at org.netbeans.modules.refactoring.spi.impl.UndoManager.undo(UndoManager.java:221)
        at org.netbeans.modules.refactoring.spi.impl.UndoAction.performAction(UndoAction.java:96)
        at org.openide.util.actions.CallableSystemAction$.run(CallableSystemAction.java:118)
        at org.netbeans.modules.openide.util.ActionsBridge$ActionRunnable.actionPerformed(ActionsBridge.java:111)
        at org.netbeans.core.ModuleActions.invokeAction(ModuleActions.java:104)
        at org.netbeans.modules.openide.actions.ActionsBridgeImpl.invokeAction(ActionsBridgeImpl.java:52)
        at org.netbeans.modules.openide.util.ActionsBridge$ActionRunnable.doRun(ActionsBridge.java:102)
        at org.netbeans.modules.openide.util.ActionsBridge$.run(ActionsBridge.java:71)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997)
java.lang.Throwable: Locked by:
        at org.openide.filesystems.FileLock.<init>(FileLock.java:80)
        at org.netbeans.modules.masterfs.filebasedfs.fileobjects.LockForFile.<init>(LockForFile.java:84)
        at org.netbeans.modules.masterfs.filebasedfs.fileobjects.LockForFile.tryLock(LockForFile.java:95)
        at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObj.lock(FileObj.java:277)
        at org.openide.loaders.MultiDataObject$Entry.takeLock(MultiDataObject.java:1189)
        at org.netbeans.modules.form.FormEditorSupport$Environment.takeLock(FormEditorSupport.java:1363)
        at org.openide.text.DataEditorSupport$Env.markModified(DataEditorSupport.java:743)
        at org.openide.text.CloneableEditorSupport.notifyModified(CloneableEditorSupport.java:1776)
        at org.netbeans.modules.form.FormEditorSupport.notifyModified(FormEditorSupport.java:567)
        at org.openide.text.CloneableEditorSupport.callNotifyModified(CloneableEditorSupport.java:1745)
        at org.openide.text.CloneableEditorSupport$Listener.vetoableChange(CloneableEditorSupport.java:2650)
        at org.netbeans.editor.BaseDocument.notifyModify(BaseDocument.java:1819)
        at org.netbeans.editor.BaseDocument.atomicUnlockImpl(BaseDocument.java:1778)
        at org.netbeans.editor.GuardedDocument.runAtomic(GuardedDocument.java:303)
        at org.openide.text.NbDocument.runAtomic(NbDocument.java:384)
        at org.netbeans.api.java.source.ModificationResult.commit(ModificationResult.java:149)
        at org.netbeans.api.java.source.ModificationResult.commit(ModificationResult.java:115)
        at org.netbeans.modules.refactoring.java.plugins.RetoucheCommit.commit(RetoucheCommit.java:85)
        at org.netbeans.modules.refactoring.api.RefactoringSession.doRefactoring(RefactoringSession.java:117)
        at org.netbeans.modules.refactoring.spi.impl.RefactoringPanel$.run(RefactoringPanel.java:473)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997)