If you upgrade jsf,you can face some problems.
Here is link which explain known issues and explains some problems
Question
I am using JBoss-4.2.2 GA. JSF libs used are with version 1.2. Is it fine to upgrade to the latest version of JSF with JBoss-4.2.2 GA?
Solution
If you upgrade jsf,you can face some problems.
Here is link which explain known issues and explains some problems