[scotty1024]

I finally figured it out: rather than getting the Java Desktop environment iRex got the Java Microedition Xlet environment from the Tao Group.

root@ereader:/home/intent# clock.sh
intent (Linux boot loader)
Copyright (c) Tao Systems Ltd 1997-2000

0x564E24 bytes read
Booting image at 0x401ce000-0x405ce400
xlet: ave @ 0x000489a0 [Xlet]
xlet: app @ 0x00026d90
xlet: toolkit @ 0x0001dd80
xlet: vm @ 0x000174d0
xlet: xlet @ 0x00027690
xlet: layout @ 0x000228a8
xlet: dialog @ 0x00027790

Code for clock.sh

root@ereader:/home/intent# cat clock.sh
#!/bin/sh
EXECPATH=sys/platform/linux/taoref/er10xx
IMGPATH=$EXECPATH
export DISPLAY=:0
export ELATE_FB_TTY=/dev/tty0
#export ELATE_KTRACE=/tmp/ktrace.log
export ELATE_DEBUGSTUB=7990

cd /home/intent/
if [ ! -d /home/intent/ROOTDIR ]
then
   ln -s / ROOTDIR
fi

    OPTIONS="-capp/stdio/xlet /classes/ClockXlet "

exec $EXECPATH/elate -B $IMGPATH/target.img -g2 -l $EXECPATH "$OPTIONS"

An example Xlet

Macbook-Pro:~/Sources/iliad/xlet scotty$ cat ClockXlet.java 
import javax.microedition.xlet.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;

public class ClockXlet implements Xlet, ActionListener {

    TextField display;
    MyClock clock;
    Button pauseButton = new Button("Pause");
    Button stopButton = new Button("Stop");
    Button resumeButton = new Button("Resume");
    XletContext context;
    public void initXlet(XletContext ctx)
            throws XletStateChangeException {
        Container c;
        context = ctx;
        try {
            c = ctx.getContainer();
        } catch (UnavailableContainerException e) {
            throw new XletStateChangeException(e.getMessage());
        }
        display = new TextField(30);
        clock = new MyClock(display);
        pauseButton.addActionListener(this);
        resumeButton.addActionListener(this);
        resumeButton.setEnabled(false);
        stopButton.addActionListener(this);
        c.setSize(200, 200);
        c.setVisible(true);
        c.add(display);
        c.add(pauseButton);
        c.add(resumeButton);
        c.add(stopButton);
        clock.start();
    }

    public void startXlet() {
        clock.setPaused(false);
        resumeButton.setEnabled(false);
        pauseButton.setEnabled(true);
    }

    public void pauseXlet() {
        clock.setPaused(true);
        resumeButton.setEnabled(true);
        pauseButton.setEnabled(false);
   }

    public void destroyXlet(boolean unconditional) {
        clock.setStopped(true);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == stopButton) {  
            clock.setStopped(true);
            context.notifyDestroyed();
        } else if (e.getSource() == pauseButton) {
            clock.setPaused(true);
            resumeButton.setEnabled(true);
            pauseButton.setEnabled(false);
            context.notifyPaused();
        } else if (e.getSource() == resumeButton) {
            context.resumeRequest();
        }
    }
}

class MyClock extends Thread {

    boolean paused, stopped;
    TextField display;

    public MyClock(TextField t) {
        display = t;
    }

    String getTime() {
        Calendar rightNow = Calendar.getInstance();
        String hour = String.valueOf(rightNow.get(Calendar.HOUR_OF_DAY));
        String min = String.valueOf(rightNow.get(Calendar.MINUTE));
        if (min.length() == 1) {
            min = "0" + min;
        }
        String sec = String.valueOf(rightNow.get(Calendar.SECOND));
        if (sec.length() == 1) {
            sec = "0" + sec;
        }
        return hour + ":" + min + ":" + sec;
    }

    public synchronized boolean isStopped() {
        return stopped;
    }

    public synchronized void setStopped(boolean value) {
        stopped = value;
        notifyAll();
    }

    public synchronized boolean isPaused() {
        return paused;
    }

    public synchronized void setPaused(boolean value) {
        paused = value;
        notifyAll();
    }

    public void run() {
        while (!isStopped()) {
            try {
                if (!isPaused()) {
                    Thread.sleep(1);
                    display.setText(getTime());
                } else {
                    synchronized (this) {
                        wait();
                    }
                }
            } catch (InterruptedException e) {
            }
        }
    }
}

Compile it

javac -source 1.2 -target 1.1 -cp ../personal.jar ClockXlet.java

The needed personal.jar can be gotten here: http://java.sun.com/products/persona.../download.html

Pull the crunchy zip apart and the juicy personal.jar core is in the lib directory.