Name: nkR10003 Date: 01/19/2001


JComboBox.setPopupVisible method throws ClassCastException exception
when auxiliary L&F is installed.

See example below:

%java -fullversion
java full version "1.4.0-beta-b46"
------------------example--------------------
import javax.swing.plaf.metal.*;
import javax.swing.plaf.*;
import javax.swing.*;
import java.lang.reflect.*;

public class test {
    public static void main(String[] args) {
        LookAndFeel lnf = new AuxLookAndFeel();
        try {
            UIManager.addAuxiliaryLookAndFeel(lnf);
        
            final JComboBox multiComboBox = new JComboBox();
           
            JFrame frame = new JFrame("test");
            frame.getContentPane().add(multiComboBox);
            frame.setVisible(true);
            try {
                SwingUtilities.invokeAndWait(new Runnable() {
                    public synchronized void run() {
                        multiComboBox.setPopupVisible(true);
                    }
                });
            } catch (InterruptedException ie) {
                ie.printStackTrace();
                System.out.println("Test Failed. Unexpected exception: " + ie);
                System.exit(0);
            } catch (InvocationTargetException ite) {
                ite.printStackTrace();
                System.out.println("Test Failed. Unexpected exception: " + ite);
                System.exit(0);
            } finally {
                frame.dispose();
            }
        
        } finally {
            UIManager.removeAuxiliaryLookAndFeel(lnf);
            System.out.println("Test passed: OK");
            System.exit(0);
        }
    }
}

class AuxLookAndFeel extends MetalLookAndFeel {
    public AuxLookAndFeel() {
        super();
    }
}
----------------output:----------------------
java.lang.reflect.InvocationTargetException
at java.awt.EventQueue.invokeAndWait(EventQueue.java:706)
at javax.swing.SwingUtilities.invokeAndWait(SwingUtilities.java:1200)
at test.main(test.java:18)
Caused by: java.lang.ClassCastException: javax.swing.plaf.multi.MultiPopupMenuUI
at javax.swing.plaf.basic.BasicPopupMenuUI$PropertyChangeHandler.propertyChange(BasicPopupMenuUI.java:185)
at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(SwingPropertyChangeSupport.java:268)
at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(SwingPropertyChangeSupport.java:236)
at javax.swing.JComponent.firePropertyChange(JComponent.java:3584)
at javax.swing.JPopupMenu.setVisible(JPopupMenu.java:684)
at javax.swing.JPopupMenu.show(JPopupMenu.java:842)
at javax.swing.plaf.basic.BasicComboPopup.show(BasicComboPopup.java:133)
at javax.swing.plaf.basic.BasicComboBoxUI.setPopupVisible(BasicComboBoxUI.java:818)
at javax.swing.plaf.multi.MultiComboBoxUI.setPopupVisible(MultiComboBoxUI.java:61)
at javax.swing.JComboBox.setPopupVisible(JComboBox.java:661)
at test$1.run(test.java:20)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:147)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:435)
at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:140)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:126)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:121)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)
Test Failed. Unexpected exception: java.lang.reflect.InvocationTargetException
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