How to stop a servlet

Can someone please tell me how do i stop a server once it has been started i.e after it has been invoking, other than shutting down the server, i am using Apache with Tomcat.
This servlet is doing some extensive work along with some serious logging so it can run from say 10 to 30 mins.

Moving to the Tomcat forum.

The Tomcat management functions say they can stop a servlet but I don't know if that means stop it from handling any more requests or stop it in the middle of a request.
Any long job should be spun off to a separate Thread and not handled in the request Thread, also your run method has to have frequent checks of some flag to see if it is ok to continue.
Bill