[Users] upgrade to jboss-as-7.1.1.Final reports "Faild to load db driver".

[snmishra at linux.vnet.ibm.com]

I upgraded from jboss-as-7.1.0.Beta1b to jboss-as-7.1.1.Final on two  
machines (from zip), both running rhel6.2. On the first it went  
smooth, but on the second machine, I am unable to get engine started.  
When I run "engine-config -l" I get error - "Faild to load db  
driver.". Noticed that postgresql-jdbc.jar does not exist under  
/usr/share/jboss-as-7.1.1.Final. It still exists under  
/usr/share/jboss-as-7.1.0.Beta1b/modules/org/postgresql/main/.

Which step did I miss?

Regards,
Sharad Mishra
IBM