To help those who wish to cluster JBoss,
Please refer to this link:
It is correct at time of posting.
We have a JBoss cluster up and running with several managed servers across 2 hosts taking part in 2 clusters.
To try and help people with JBoss Clustering I have produced a PDF on how to achieve this, including Apache HA configuration, for JBoss 7.x.x / 6.00 EAP.
When you have worked through this you will have an Apache HA to JBoss HA cluster with session-shipping / session-failover.
I hope it helps.