Using the MouseTrack.java program and the example1.html file in ~mem/classes.
Delete the CatchMe.class file.
NOTE: MouseTrack has not yet been completely upgraded to beta.

Do the following:
        % appletviewer -debug example1.html
                Loading jdb ...
                0xee301bb8:class(sun.applet.AppletViewer)
        > stop in MouseTrack.init
                Breakpoint set at MouseTrack.init
        > run
                run sun.applet.AppletViewer example1.html
                running ...
                Breakpoint hit: MouseTrack.init (MouseTrack.java:15)
        Thread-6[1] list
                11 CatchMe box;
                12 int onaroll;
                13
                14 public void init() {
                15 => onaroll = 0;
                16 box = new CatchMe(50, 50, this);
                17 add(box);
                18 box.show(); //Should I be doing this?
                19 resize(500, 500);
        Thread-6[1] step
                Uncaught exception: java.lang.NullPointerException
                        at MouseTrack.paint(MouseTrack.java:29)
                        at sun.awt.motif.MComponentPeer.paint(MComponentPeer.java:109)
                        at sun.awt.motif.MComponentPeer.handleExpose(MComponentPeer.java:170)
                        at java.lang.Thread.run(Thread.java)
        AWT-Motif[1]

Why would I have a NullPointerException on this?