WebappClassLoader does not seem to implement getResources properly. There is an implementation for getResource that does things properly, but findResources simply delegates to super(). For example, this means that if I have multiple JAR files in WEB-INF/lib each of which contains a file foo.txt, and I want to get URL's to all of those files, I cannot use getResources("foo.txt") as I should be able to.
Should be fixed in the 10/05/2001 nightly.