java.util.NoSuchElementException
        at java.util.LinkedList.getFirst(LinkedList.java:109)
        at org.netbeans.modules.javacore.internalapi.UndoManager.addItem(UndoManager.java:267)
        at org.netbeans.modules.javacore.internalapi.UndoManager.addItem(UndoManager.java:248)
        at org.netbeans.modules.javacore.jmiimpl.javamodel.ResourceImpl.commitConfirmed(ResourceImpl.java:895)
        at org.netbeans.modules.javacore.ExclusiveMutex.notifyElements(ExclusiveMutex.java:526)
[catch] at org.netbeans.modules.javacore.ExclusiveMutex.leave(ExclusiveMutex.java:358)
        at org.netbeans.mdr.NBMDRepositoryImpl.endTrans(NBMDRepositoryImpl.java:248)
        at org.netbeans.modules.refactoring.api.RefactoringSession.doRefactoring(RefactoringSession.java:71)
        at org.netbeans.modules.refactoring.ui.RefactoringPanel$1.run(RefactoringPanel.java:547)
        at org.openide.util.Task.run(Task.java:207)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:469)        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:870)