Name: wm7046 Date: 02/05/2002


FULL PRODUCT VERSION :
java version "1.4.0-rc"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-rc-b91)
Java HotSpot(TM) Client VM (build 1.4.0-rc-b91, mixed mode)

FULL OPERATING SYSTEM VERSION :
Microsoft Windows 2000 [Version 5.00.2195]



A DESCRIPTION OF THE PROBLEM :
in Java 1.4, if any DnD is enabled and a modal dialog is
shown, the application locks up completely if a drag is
attempted to the app.

There is a possibly-related bug, 4403757, but that does not
mention locking up.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. create an app that has any DnD-enabled component
(example: JTree).
2. show a modal dialog (example:
JOptionPane.showMessageDialog)
3. Drag from the windows desktop over the app.


EXPECTED VERSUS ACTUAL BEHAVIOR :
expect: no drag allowd
actual: no drag allowed, but application completely locks
up. Windows task manager needed to kill it.

This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.dnd.*;

public class TestDrag extends JFrame
{
    public TestDrag()
    {
        super("Test of DnD bug");
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);

        JMenuBar menuBar = new JMenuBar();
        JMenu menu = new JMenu("test");

        menu.add(new JMenuItem(new AlertAction(this)));

        menuBar.add(menu);
        this.setJMenuBar(menuBar);

        JComponent content = new JTree();
        content.setBackground(Color.white);
        content.setOpaque(true);
        content.setPreferredSize(new Dimension(400,300));
        this.getContentPane().add(content);

        this.pack();
    }
    public static void main(String[] args)
    {
        new TestDrag().show();
    }
    public static class AlertAction extends AbstractAction
    {
        private JFrame frame;
        public AlertAction(JFrame frame)
        {
            super("Alert...");
            this.frame = frame;
        }
        public void actionPerformed(ActionEvent e)
        {
            JOptionPane.showMessageDialog(frame, "Try dragging now.", "Howdy",
                    JOptionPane.INFORMATION_MESSAGE);
        }
    }
}
---------- END SOURCE ----------

CUSTOMER WORKAROUND :
none found.
(Review ID: 139032)
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