As far as I was trying this hotstandby feature with the address binding that Jboss provide, I am out of luck.
But in the Veritas scripts are serveral possibilitys to watchdog services. The real problem is the switching from down to standby and the heartbeat link between the nodes. JBoss does not bind absolutely reliable nor comprehensible services to IPs. The bindings depend heavily on DNS, WINS, localhost, 0.0.0.0 and the nsswitch and resolv config. And some services are more the same than others.