Where to find service classes

Hi there,
what's the best way to handle the CLASSPATH within soap? I have a 
webapp that contains a class that will handle soap requests. Of course, 
when a request for that class comes to the rpcrouter, the router can't 
find the class as it's in another servlet.
Can someone maybe advise on the best method for allowing the router to 
find classes in other servlets?
many thanks,
Alistair