Name: gm110360 Date: 08/20/2004


FULL PRODUCT VERSION :
java version "1.4.2_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_01-b06)
Java HotSpot(TM) Client VM (build 1.4.2_01-b06, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
SunOS csld014.unbc.ca 5.9 Generic_112233-05 sun4u sparc SUNW,Sun-Blade-100

A DESCRIPTION OF THE PROBLEM :
After a JList is serialized, the previous items in a JList are no longer visible.

The items are still in the DefaultListModel, and the Serialized copy still has the items visible.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run example, click serialize

The contents of the model after serialization will be output to System.err
the serialized copy will be loaded into a new frame titled "copy"

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The original frame would still contain a JList with is elements
ACTUAL -
JList was empty

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.io.*;

/** This class serves to show that the items in a JList disappear when it is
    serialized. */
public class Bug2 {
    public static void main(String[] args) {
        final JFrame f = new JFrame();
        final JPanel p = new JPanel(new BorderLayout());
        final JList l = new JList(new DefaultListModel());
        DefaultListModel lm = (DefaultListModel)l.getModel();
        lm.addElement("test");
        p.add(l, BorderLayout.CENTER);
        JButton b= new JButton("serialize");
        b.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e){
                f.setVisible(false);
                try {
                    java.io.FileOutputStream s
                        = new java.io.FileOutputStream(new java.io.File("out"));
                    java.io.ObjectOutputStream o
                                    = new java.io.ObjectOutputStream(s);

                    o.writeObject(p);

                    o.close();
                    f.setVisible(true);

                    // The item is still there
                    System.err.println(((DefaultListModel)l.getModel())
                    .getElementAt(0));
                    // Just invisible
                    
                    // The saved version is OK too
                    
                    FileInputStream f = new FileInputStream(new File("out"));
                    ObjectInputStream i = new ObjectInputStream(f);

                    JPanel p2 = (JPanel)i.readObject();
                    i.close();
                    JFrame frame = new JFrame();
                    frame.setContentPane(p2);
                    frame.pack();
                    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                    frame.setTitle("copy");
                    frame.setVisible(true);
                }
                catch (Exception ex) {
                    ex.printStackTrace();
                    System.exit(1);
                }
            }
        });
        p.add(b, BorderLayout.NORTH);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setContentPane(p);
        f.pack();
        f.setVisible(true);
    }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Since the data is still in the model I made a custom wroteObject and Made a new DefaultListModel be getting the old model and copies its elements one-by-one into the new Model and then setting hteJlist to use the new model.
(Incident Review ID: 286056)
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