JEditorPane.registerEditorKitForContentType() takes a className without
taking a classLoader. Internally a Class.forName() is used. This makes
it impossible to create the EditorKit from anything but the class loader
used in Class.forName.

*NOTE* in 1.2, the class loader used by a class in rt.jar (like JEditorPane)
is the system classloader, which does *NOT* include CLASSPATH.

It may be worth checking if there are other places in Swing where this is done,
this is the second critical bug in this area that I find.

- eduardo