Thanks for reply. I have seen solution for this problem in the following link.
But jbossweb-tomcat50.sar is the tomcat service provided by JBOSS. Is there any other solution to achive the same thing by configuring one of the file ie is reside in <JBOSS_HOME>/server/<config-name>/conf directory.
Just follow my steps, editing the files in jbossweb-tomcat50.sar. It should work.