java.lang.ClassCastException: org.netbeans.jmi.javamodel.JavaClass$Impl
        at org.netbeans.modules.javacore.parser.MDRParser.processASTBody(MDRParser.java:818)
        at org.netbeans.modules.javacore.parser.MDRParser.processASTBody(MDRParser.java:850)
        at org.netbeans.modules.javacore.parser.MDRParser.processASTBody(MDRParser.java:919)
        at org.netbeans.modules.javacore.parser.MDRParser.processASTBody(MDRParser.java:631)
        at org.netbeans.modules.javacore.parser.MDRParser.processASTBody(MDRParser.java:669)
        at org.netbeans.modules.javacore.parser.MDRParser.processASTBody(MDRParser.java:631)
        at org.netbeans.modules.javacore.parser.MDRParser.processASTBody(MDRParser.java:600)
        at org.netbeans.modules.javacore.parser.MDRParser.enterBody(MDRParser.java:81)
        at org.netbeans.modules.javacore.jmiimpl.javamodel.BehavioralFeatureImpl.initBody(BehavioralFeatureImpl.java:127)
        at org.netbeans.modules.javacore.jmiimpl.javamodel.BehavioralFeatureImpl.getBody(BehavioralFeatureImpl.java:98)
        at org.netbeans.jmi.javamodel.Method$Impl.getBody(Unknown Source)
        at org.netbeans.modules.javacore.jmiimpl.javamodel.JavaClassImpl.getUsers(JavaClassImpl.java:992)
        at org.netbeans.modules.javacore.jmiimpl.javamodel.JavaClassImpl.getUsers(JavaClassImpl.java:283)
        at org.netbeans.jmi.javamodel.JavaClass$Impl.getUsers(Unknown Source)
        at org.netbeans.api.refactoring.WhereUsedQuery.prepare(WhereUsedQuery.java:59)
        at org.netbeans.api.refactoring.ui.ParametersPanel.showDialog(ParametersPanel.java:180)
        at org.netbeans.modules.refactoring.ui.RefactoringPanel.refresh(RefactoringPanel.java:338)
        at org.netbeans.modules.refactoring.ui.RefactoringPanel.<init>(RefactoringPanel.java:71)
        at org.netbeans.api.refactoring.ui.AbstractRefactoringAction.run(AbstractRefactoringAction.java:91)
        at org.netbeans.api.refactoring.ui.AbstractRefactoringAction.actionPerformed(AbstractRefactoringAction.java:62)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)
        at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1839)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:289)
        at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1113)
        at javax.swing.plaf.basic.BasicMenuItemUI$MouseInputHandler.mouseReleased(BasicMenuItemUI.java:943)
        at java.awt.Component.processMouseEvent(Component.java:5100)
        at java.awt.Component.processEvent(Component.java:4897)
        at java.awt.Container.processEvent(Container.java:1569)
        at java.awt.Component.dispatchEventImpl(Component.java:3615)
        at java.awt.Container.dispatchEventImpl(Container.java:1627)
        at java.awt.Component.dispatchEvent(Component.java:3477)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3198)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)
        at java.awt.Container.dispatchEventImpl(Container.java:1613)
        at java.awt.Window.dispatchEventImpl(Window.java:1606)
        at java.awt.Component.dispatchEvent(Component.java:3477)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
[catch] at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)