java.lang.NullPointerException
        at org.netbeans.modules.refactoring.java.RetoucheUtils.getOverridingMethods(RetoucheUtils.java:219)
        at org.netbeans.modules.refactoring.java.plugins.RenameRefactoringPlugin$2.run(RenameRefactoringPlugin.java:414)
        at org.netbeans.modules.refactoring.java.plugins.RenameRefactoringPlugin$2.run(RenameRefactoringPlugin.java:387)
        at org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:680)
        at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:607)
        at org.netbeans.modules.refactoring.java.plugins.RenameRefactoringPlugin.getRelevantFiles(RenameRefactoringPlugin.java:381)
        at org.netbeans.modules.refactoring.java.plugins.RenameRefactoringPlugin.prepare(RenameRefactoringPlugin.java:446)
        at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare2(AbstractRefactoring.java:406)
        at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare(AbstractRefactoring.java:390)
        at org.netbeans.modules.refactoring.api.AbstractRefactoring.prepare(AbstractRefactoring.java:207)
        at org.netbeans.modules.refactoring.spi.impl.ParametersPanel$Prepare.run(ParametersPanel.java:787)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997)