Name: dsR10051 Date: 10/17/2000



The method
protected void java.awt.Component.processKeyEvent(KeyEvent e)
is not called by event dispatch thread even if a KeyListener
object is registered via addKeyListener
(See JavaDoc for Component.processKeyEvent).

Here is a minimized test:
import java.awt.*;
import java.awt.event.*;

public class ComponentTest5 {
    public static void main (String[] args) {
        EventQueue eq = Toolkit.getDefaultToolkit().getSystemEventQueue();
        ChildComponent chcomponent = new ChildComponent();
        KeyEvent e = new KeyEvent(chcomponent, KeyEvent.KEY_RELEASED, (long)0, 0, KeyEvent.VK_UNDEFINED);
        DummyKeyListener cl = new DummyKeyListener();
        chcomponent.addKeyListener(cl);

        eq.postEvent(e);
        synchronized (chcomponent) {
            while(!chcomponent.keyEventProcessed) {
                try {
                    System.out.println("Waiting");
                    System.out.flush();

                    chcomponent.wait();

                    System.out.println("Waiting");
                    System.out.flush();
                } catch (InterruptedException ie) {
                    ie.printStackTrace();
                }
            }
        }
        System.exit(0);
    }
}

class ChildComponent extends Component {
    public ChildComponent() {
        super();
    }

    boolean keyEventProcessed = false;
    public synchronized void processKeyEvent(KeyEvent e) {
        keyEventProcessed = true;
        System.out.println("processKeyEvent called");
        System.out.flush();
        super.processKeyEvent(e);
        System.out.println("processKeyEvent done");
        System.out.flush();
        notifyAll();
    }
}

class DummyKeyListener extends KeyAdapter {
}

--- Output ---
%/net/sword/export3/JDK1.4.0beta-b36/solaris/bin/java -version
java version "1.4.0beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0beta-b36)
Java HotSpot(TM) Client VM (build 1.4beta-B36, mixed mode)
%/net/sword/export3/JDK1.4.0beta-b36/solaris/bin/java ComponentTest5
Waiting
^C
%

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