I don't think there is a spec compliant way to do this. Mapping url-patterns to servlets, filters, etc.. is really the job of the container itself. If you're using an open source container such as Tomcat, you could probably find the code that holds these mappings fairly easily and tap into that.
Also remember, url-patterns can have wild card characters which would allow an infinte number of possible patterns.
Why would you need to do this? [ July 21, 2006: Message edited by: Ben Souther ]