This is a fast Quick start to get Apache2 web server working with JBoss as a backend application server for the first time like me an hour ago ;-).
The OS used is Gentoo Linux.
Both servers are running on the localhost.

For the Jboss server I use the version 4.0.1sp1, just get it from www.jboss.org unpack it under /opt, make a symbolic link from the unpacked directory to jboss and start it up with /opt/jboss/bin/run.sh
I presume you have Apache2 and Jboss already setup and running.

There is nothing to configure on the Jboss side, for extra details you can read:
http://docs.jboss.org/jbossas/jboss4guide/r2/html/ch9.chapt.html#d0e22691

For the non-java side there is very little to configure thanks to the emerge guys :-)

First emerge the mod_jk2

# emerge mod_jk2

After the emerge finished, we need to make apache aware of the plugin

# vi /etc/apache2/conf/apache2.conf

Add the following line under the other LoadModule lines:

LoadModule jk2_module extramodules/mod_jk2.so

Now add some test url. Remove this ASP it's only for testing now.

# vi /etc/apache2/conf/workers2.properties

add the following lines to the end of the file:

[uri:/web-console/*]
worker=ajp13:localhost:8009

This will export the web-admin of JBoss to the Apache web server.
Restart Apache

# /etc/init.d/apache2 restart

Test if JBoss is running by opening the url:
http://<your.host.name>:8080/web-console
Ok? You should see the JBoss web console
Test if Apache is running by opening the url:
http://<your.host.name>/
Ok? Now for the final test:
open the url http://<your.host.name>/web-console
You should see the web-admin console of the JBoss application server running over Apache.
Great! That's all. If you need other urls just edit the workers2.properties file.

Wessel de Roode

References:
http://jakarta.apache.org/tomcat/tomcat-3.3-doc/mod_jk-howto.html
http://rimuhosting.com/mod_jk2.jsp
http://docs.jboss.org/jbossas/jboss4guide/r2/html/ch9.chapt.html#d0e22691