I have an applet that forks a thread to asynchronously update the
screen about once a second. On win32, if I click the QuitApplet button,
about 20% of the time I get:

    java.lang.InternalError: getGraphics implemented only for Canvas Components
at sun.awt.win32.Win32Graphics.<init>(Win32Graphics.java:49)
at sun.awt.win32.MComponentPeer.getGraphics(MComponentPeer.java:177)
at java.awt.Component.getGraphics(Component.java:554)
at sunw.idl.util.Chart.step(Chart.java:205)
at sunw.idl.util.Tabulator.step(Tabulator.java:252)
at sunw.idl.util.UpdaterThread.run(Tabulator.java:53)

All the sunw.idl.util.* classes are mine. UpdaterThread is the
asychronous updater. Tabulator.step coordinates the updating, and
Chart.step is the code that actually tries to touch the screen. I strongly
suspect that java.awt.Component.getGraphics() is being called as the applet
is being taken down and things are falling apart. (If it helps, I've been
running the same applet on Solaris for several months and have never seen
this error (or anything like it) in that part of the world.)

    This is not a big deal, since the applet goes away, which is what I've
asked it to do, but it does leave a bad taste in the mouth about our code,
which we should try to avoid.

... peter 4/25/96 3:20PM