It is an old tutorial. You want to move/copy jboss-net.sar from server/all/deploy to server/default/deploy so it runs your default instance - assuming you normally run the JBoss default instance.
Probably ignore the CATALINA references in your classpath definition and replace them with fully qualified paths to the necessary JARs.
You want to change your reference for servlet.jar to server/default/lib/javax.servlet.jar. You probably won't need jaxp.jar - it doesn't come with JBoss. If you do need it, download it and reference it.
See how that goes.
Thanks for the help jonlee (and sorry for being so tardy in my thanks)