Consider this scenario:
Client is a EJB running in AppServer A. This client needs to post a message to a topic. The JMS provider is Jboss (JbossMQ). Another client running in Appserver A subscribes to that topic.
Is this scenario feasible with JBossMQ? In other words, I would like to use an Open Source JMS provider in conjunction with commercial App Server.
yep. There are quite a few long discussions about how to achieve this (and any problems) depending on what 'A' is