[jbossws-dev] How to change the user, who runs the Web Services in JBoss (axis)

Hi all, I have implemented a Web Service, which runs a shell script on our compute cluster. The problem is, that this Web Service (and so the shell script too) is run by the admin user, who has installed JBoss. I like to change this, but couldn't find any hint how to do this. I am using JBoss jboss-tomcat-4.0.4RC1 and I deployed axis.war in the deploy directory. The Web Service is in Java implemented. So if anyboby of you can help me, I would be very grateful! Thanks in advance! Anika