Sharing jython.jar in tomcat

I'd like to share a single copy of jython.jar across many web 
applications running inside tomcat4.

So I delete $ROOT/webapp/WEB-INF/lib/jython.jar and copy it to 
/var/lib/tomcat4/shared/lib/jython.jar and importing simple classes such 
as java.lang.System from jython scripts breaks.

I suspect that this has something to do with classloaders i.e jython is 
loaded by different classloaders in the two cases. But I'm not sure why 
it's able to find rt.jar in one case, but not the other.

Any tips on how to get this to work on jpackage-1.5/tomcat-4.1 ?

        -Arun



-------------------------------------------------------
The SF.Net email is sponsored by EclipseCon 2004
Premiere Conference on Open Tools Development and Integration
See the breadth of Eclipse activity. February 3-5 in Anaheim, CA.
http://www.eclipsecon.org/osdn