When starting openjump using the CVS version of GNU Classpath, I see this message on stdout: fireChangedUpdate not implemented A quick look in the source tree indicates that javax/swing/text/html/HTMLDocument.java is the source of this messages. I'm not quite sure what the effect is on openjump, but as it isn't working quite right, so I thought it best to report the problem.
This messages comes from an unimplemented method in the HTML package, but should not be critical.
Apparently this method has been removed, and thus no longer prints that warning. From what I can tell there is no reason to have this method overridden. If it turns out that it should, we still can do it. It shouldn't affect compatibility so far.