Similar to our Tomcat 5 tip, but this tip is specific to JBoss 4 and was submitted by our user goldfrog.

You need to go into your <jboss 4 install directory>\server\all\deploy\jbossweb-tomcat55.sar\conf directory and open your web.xml file. From there you do exactly the same thing as our Tomcat 5 tip by adding the new init-param described.