Hi Sameer,
From your description I cannot see exactly how you integrated jBPM with your JBoss AS server; I'm guessing that you followed the installation script that adds the /jbpm directory to the /deploy directory of your server?
Fact is that this "hibernate.identity.hbm.xml" file is inside the identity.jar file (which resides in the /deploy/jbpm/jbpm-service.sar directory if you followed said script), so this may be missing or corrupt.
If you are starting out with jBPM, chances are that you're not using the functionality in the identity module yet. If that is the case, you can remove the dependency on that module by commenting out the following lines from jBPM's Hibernate configuration (hibernate.cfg.xml file):
<mapping resource="hibernate.extra.hbm.xml" />
<mapping resource="hibernate.identity.hbm.xml" />
That way this particular file will not be read and you should be able to proceed with your deployment.
HTH.
Cheers,
Maurice