While switching focus between AWT components, FOCUS_LOST and FOCUS_GAINED events are generated as expected. However, for all FOCUS_GAINED and FOCUS_LOST events, the getOppositeComponent() method always returns null and it's not possible to determine the component that gained focus.

This behavior (for AWT GUI Components) happens on following platforms:
- Solaris, Solaris IA, and Linux (working OK for Win98)

This bug was found with new Focus Test Suite test:
AWT/OppositeComponentTest/

Tested with build:
- jdk1.4 Build40

Sample code to reproduce bug (after GUI comes up just click on any of the components and observe the focus events generated):

import java.awt.*;
import java.awt.event.*;

public class AwtOppositeComponent extends Frame implements FocusListener {

Button button;
TextField textfield;
java.awt.List list;
Panel testpanel;

Component focusLost=null;
Component focusGained=null;

public AwtOppositeComponent() {

testpanel = new Panel();

button = new Button("Button");
button.addFocusListener(this);

textfield = new TextField("TextField");
textfield.addFocusListener(this);

list = new java.awt.List(2);
list.add("Item 1");
list.add("Item 2");
list.add("Item 3");
list.addFocusListener(this);

testpanel.add(button);
testpanel.add(textfield);
testpanel.add(list);
testpanel.setBackground(Color.yellow);

add(testpanel);
setSize(250,250);
setVisible(true);
show();
}

public void focusLost(FocusEvent fe) {
System.out.println("\n** focusLost Method" );
focusGained = fe.getOppositeComponent();
if (focusGained == null) {
System.out.println("** Warning: getOppositeComponent() is null");
}
System.out.println(fe);
}

public void focusGained(FocusEvent fe) {
            System.out.println("\n** focusGained Method");
            focusLost = fe.getOppositeComponent();
            if (focusLost == null) {
System.out.println("** Warning: getOppositeComponent() is null");
}
            System.out.println(fe);
}

public static void main(String args[]) {
new AwtOppositeComponent();
    }
}