Name: rmT116609 Date: 08/19/2004


FULL PRODUCT VERSION :
java version "1.5.0-beta3"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta3-b60)
Java HotSpot(TM) Client VM (build 1.5.0-beta3-b60, mixed mode, sharing)


ADDITIONAL OS VERSION INFORMATION :
Linux 2.6.4 #1 i686 Intel(R) Pentium(R) 4 CPU 2.40GHz GenuineIntel GNU/Linux

Microsoft Windows XP [Version 6.1.2600]

A DESCRIPTION OF THE PROBLEM :
Calls to JComponent.requestFocusInWindow() return false and have no
effect for components in a JTabbedPane when carried out straight after
a tab switch.

If carried out later (e.g during processing of a subsequent event) they
work as expected.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile and execute the attached sample. Allow to run until
"Adding change listener" is printed. Try switching between the
two tabs using the mouse.

The code illustrates four things at five second intervals:

1) Selecting a tab and immediatly attempting to focus on a component
2) Selecting a tab
3) Focusing on a component on that tab
4) Adding a ChangeListener to attempt to focus on the lower text field
each time the user switches tabs
 
All focus requests succeed with JDK 1.4.1/1.4.2 and all but (3) return false
under JDK 1.5.0, build 60.


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -

Expected output would be as produced by version 1.4.1 (below).
On clicking between the tabs at the end focus stays in the bottom
two text fields.

$ java TabbedPaneDemo
Combined tab select and set focus
Focusing on 22 - requestFocusInWindow() returned true
Separate tab select
Seperate focus adjustment
Focusing on 12 - requestFocusInWindow() returned true
Adding change listener
Focusing on 22 - requestFocusInWindow() returned true
Focusing on 12 - requestFocusInWindow() returned true
Focusing on 22 - requestFocusInWindow() returned true
Focusing on 12 - requestFocusInWindow() returned true

ACTUAL -

Output from 1.5.0 is as below. On clicking between the tabs
at the end focus stays in the top two text fields.

$ java TabbedPaneDemo
Combined tab select and set focus
Focusing on 22 - requestFocusInWindow() returned false
Separate tab select
Seperate focus adjustment
Focusing on 12 - requestFocusInWindow() returned true
Adding change listener
Focusing on 22 - requestFocusInWindow() returned false
Focusing on 12 - requestFocusInWindow() returned false
Focusing on 22 - requestFocusInWindow() returned false
Focusing on 12 - requestFocusInWindow() returned false


REPRODUCIBILITY :
This bug can be reproduced always.

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

/*
 * Based on TabbedPaneDemo.java from Sun Java tutorial
 */

import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;

public class TabbedPaneDemo extends JPanel implements ChangeListener {

    JTextField textField11;
    JTextField textField12;
    JTextField textField21;
    JTextField textField22;
    JTabbedPane tabbedPane;

    public TabbedPaneDemo() {
        super(new GridLayout(1, 1));
        tabbedPane = new JTabbedPane();
        JComponent panel1 = makeTextPanel1();
        tabbedPane.addTab("Tab 1", null, panel1, "");
        JComponent panel2 = makeTextPanel2();
        tabbedPane.addTab("Tab 2", null, panel2, "");
        add(tabbedPane);

        actionThread.start();
    }

    protected JComponent makeTextPanel1() {
        JPanel panel = new JPanel(false);
        textField11 = new JTextField("11: test text one two three four");
        textField12 = new JTextField("12: example text");
        panel.setLayout(new GridLayout(2, 1));
        panel.add(textField11);
        panel.add(textField12);
        return panel;
    }

    protected JComponent makeTextPanel2() {
        JPanel panel = new JPanel(false);
        textField21 = new JTextField("21: example text");
        textField22 = new JTextField("22: example text");
        panel.setLayout(new GridLayout(2, 1));
        panel.add(textField21);
        panel.add(textField22);
        return panel;
    }

    private static void createAndShowGUI() {
        JFrame frame = new JFrame("TabbedPaneDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(new TabbedPaneDemo(), BorderLayout.CENTER);
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });

    }

    public void stateChanged(ChangeEvent e) {
        attemptToSetFocus();
    }

    private void attemptToSetFocus() {
        boolean result;
        switch ( tabbedPane.getSelectedIndex() ) {
        case 0:
            System.out.print("Focusing on 12 - ");
            result = textField12.requestFocusInWindow();
            break;
        case 1:
            System.out.print("Focusing on 22 - ");
            result = textField22.requestFocusInWindow();
            break;
        default:
            throw new Error("Unexpected index value");
        }

        System.out.println("requestFocusInWindow() returned " + result);
    }

    Thread actionThread = new Thread() {
        public void run() {
            try { Thread.sleep(5000); } catch (InterruptedException e) {}

            System.out.println("Combined tab select and set focus");

            SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    tabbedPane.setSelectedIndex(1);
                    attemptToSetFocus();
                }
            });

            try { Thread.sleep(5000); } catch (InterruptedException e) {}

            System.out.println("Separate tab select");

            SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    tabbedPane.setSelectedIndex(0);
                }
            });

            try { Thread.sleep(5000); } catch (InterruptedException e) {}

            System.out.println("Seperate focus adjustment");

            SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    attemptToSetFocus();
                }
            });

            try { Thread.sleep(5000); } catch (InterruptedException e) {}

            System.out.println("Adding change listener");
            SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    tabbedPane.addChangeListener(TabbedPaneDemo.this);
                }
            });
        }
    };

}


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

CUSTOMER SUBMITTED WORKAROUND :

Start a thread and which calls SwingUtilities.invokeLater()
to call to requestFocusInWindow().

Release Regression From : 1.4.2_05
The above release value was the last known release where this
bug was known to work. Since then there has been a regression.

(Incident Review ID: 297637)
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