Name: rk38400 Date: 04/11/98


Creation of a modal dialog box will hang up
if the call is within a synchronized block. The
dialog box may or not get painted, but the whole
system will quickly become unresponsive, and no
further window repainting will be done.

I will attach source below which demonstrates the
problem.

This bug is probably related to #4034834, which
was posted over a year ago.

This badly needs to be fixed, or at least properly
documented.

Thanks,
--Mike



import com.sun.java.swing.*;
import java.awt.event.*;
import java.io.*;

public class DialogBug extends JFrame {
  public DialogBug() {
    JButton goodButton = new JButton("This works");
    goodButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) { good(); }
    });

    JButton badButton = new JButton("But this hangs");
    badButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) { bad(); }
    });

    getContentPane().add(goodButton, "West");
    getContentPane().add(badButton, "East");
    pack();
  }

  public void good() {
    JOptionPane.showMessageDialog(null, "We're cool!", "Modal Dialog",
JOptionPane.INFORMATION_MESSAGE);
    synchronized (this) {
      notify();
    }
  }

  public synchronized void bad() {
    JOptionPane.showMessageDialog(null, "We're hosed!", "Modal Dialog",
JOptionPane.ERROR_MESSAGE);
    notify();
  }

  public synchronized void showAndWait() throws InterruptedException {
    show();
    wait();
  }

  public static void main(String[] args) {
    DialogBug db = new DialogBug();
    try {
      db.showAndWait();
    } catch (InterruptedException e) {
    }
  }
}
(Review ID: 26253)
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