Name: dbT83986 Date: 08/14/99


java version "1.2.2"
Classic VM (build JDK-1.2.2-W, native threads, symcjit)

JAVA.EXE full version "JDK-1.2.2-W"

1. Run the code below and click on JTextField "Text1B" to give it focus.
2. Click on the Label "click here". This swaps panels with a new one.
3. Click on the JTextField "Text2B" in this new panel to give it focus .
4. Click on the Label "click here" again. This 'swaps' back to the original panel.
5. Click on the JTextField "Text1A"

Result: Both JTextFields appear to have focus via a flashing cursor.
The focusLost method was never reached on the JTextField to set the flag for the caret.

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

public class LostFocusTestFrame extends Frame implements MouseListener {
    
    private static final int P1 = -1, P2 = 1, FLIP = -1;
    
private Panel panel1 = new Panel(),
panel2 = new Panel();

private Label label1 = new Label("click here");

private JTextField text1A = new JTextField(),
text1B = new JTextField(),
text2A = new JTextField(),
text2B = new JTextField();

private int currentPanel;

public LostFocusTestFrame() {

text1A.setText("Text1A");
text1B.setText("Text1B");
text2A.setText("Text2A");
text2B.setText("Text2B");
panel1.add(text1A);
panel1.add(text1B);
panel2.add(text2A);
panel2.add(text2B);
currentPanel = P1;
add(panel1, BorderLayout.CENTER);
add(label1, BorderLayout.SOUTH);
label1.addMouseListener(this);

}


// listen for mouse click events
public void mousePressed(MouseEvent event) {

switch (currentPanel) {
case P1:
remove(panel1);
         panel1.setVisible(false);
add(panel2, BorderLayout.CENTER);
panel2.setVisible(true);
break;

case P2:
remove(panel2);
         panel2.setVisible(false);
add(panel1, BorderLayout.CENTER);
panel1.setVisible(true);
break;
}

currentPanel = currentPanel * FLIP;

        invalidate();
        validate();
}

public void mouseEntered(MouseEvent event) {}
public void mouseExited(MouseEvent event) {}
public void mouseClicked(MouseEvent event) {}
public void mouseReleased(MouseEvent event) {}

public static void main(String[] args) {

LostFocusTestFrame frm = new LostFocusTestFrame();
frm.setSize(300,100);
frm.show();
}
}
(Review ID: 93924)
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company - Magma Design Automation (06/20/01)
Customer has the same problem in solaris 7. They are using jdk 1.3.0_02
and cannot upgrade to 1.3.1 or jdk 1.3.0_03 because Xrunner (3rd party)
will only run with jdk 1.3.0_02 or below. The following is the description of
customer' problem.

We have a large Java application (greater the 100K lines of code).
There is a console component that we built using JTextPane that
behaves like a UNIX XTERM application. The user can enter commands
onto the "bottom line" and the results scroll onto the upper portion
of the text component.

With heavy use, about once a day the console text component will loose
the ability to receive input. There is no way to type text or new-lines
into that component. In fact some other component (not necessarily a
text component) has focus and receives the keystrokes. When the console
"locks up" there are multiple (2 to four) blinking insertion bars at
the same time (one per component - but 4 different components). There
are no Java exceptions. The console is completely locked out. There is
no way to recover. (In java 1.2.x we would get the multiple insertion
bars, but the component would eventually recover.)

we were able to get XRunner to run on JDK1.3.0_02 with
SwingSet. It also failed the JTextComponent Focus test. XRunner
does not run on any versions later than 1.3.0_02 today.

Using XRunner we can reproduce this problem very quickly every time
using SwingSet or our application. Without XRunner it may take one
or two days for a user to run into this problem.