JSF released its first version on 11 mar 2004, then JSF 1.1 and now it has reached to the version 1.2. There are many releases of 1.1 and 1.2. Read the article ?JSF Versions? to get the listing of versions released so far including the date of release. Here, you will get features of the release, versions of the supporting technologies etc. Also, you will go through some new features included and changes made in JSF 1.2 specification like:
Unified Expression Language (EL)
Integration with JSTL
Use of multiple renderKits
Provide XML Schema for the config files, instead of using DTD.
Security enhancements for client side state saving.
Solve the ?duplicate button press? problem.
The portlet related bug-fixes
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