Hi all,

Need to know How can I setup JBOSS over RHCS. Also I have RHEL 6.1. Is it stable??

Did you try reading the instructions on the Jboss site, or even trying to look this up?
https://docs.jboss.org/jbossas/guide...l/install.html
Yes...and since you're using RHEL, have you contacted Red Hat support?? They can answer stability questions, and (since you're a paying customer), you can also look things up on their knowledgebase. If you're NOT paying for RHEL, you should be running CentOS instead.

Thanx for the link but this refers to the installation of JBOSS whereas i need to know how to configure HA for already installed JBOSS application.

And all this I am doing is a testing environment and I am using the evaluation copies from redhat so cannot ask for support.

Spell out your words. And this isn't the same question you asked at first, is it??? Again, putting "configure jboss ha" into Google pulls up (amazingly), the JBoss community site, where setting up HA is documented.
https://community.jboss.org/wiki/JBossHA?_sscc=t
Wrong. If you have downloaded the evaluation copies, you have a 30 day license with support. Use it. If you are already planning on using RHEL in a production environment, then you should also be ready to PAY for RHEL, so either way, you'll be in a supported environment.

If you're not planning on paying for RHEL...stop now. Remove it, and load CentOS instead. You WILL NOT get updates/patches/bugfixes/security fixes in RHEL, unless you are a PAYING CUSTOMER. Your production server will be unstable after a while, and you won't be able to access online repositories. CentOS is virtually identical to RHEL, but FREE.