java.lang.NullPointerException
        at org.netbeans.modules.refactoring.java.RetoucheUtils.getOverridingMethods(RetoucheUtils.java:221)
        at org.netbeans.modules.refactoring.java.ui.ChangeParametersPanel.initTableData(ChangeParametersPanel.java:486)
        at org.netbeans.modules.refactoring.java.ui.ChangeParametersPanel.access$200(ChangeParametersPanel.java:74)
        at org.netbeans.modules.refactoring.java.ui.ChangeParametersPanel$1.run(ChangeParametersPanel.java:135)
        at org.netbeans.modules.refactoring.java.ui.ChangeParametersPanel$1.run(ChangeParametersPanel.java:144)
        at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:666)
        at org.netbeans.modules.refactoring.java.ui.ChangeParametersPanel.initialize(ChangeParametersPanel.java:125)
        at org.netbeans.modules.refactoring.spi.impl.ParametersPanel$10.run(ParametersPanel.java:492)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997)