Well, it depends on what you mean by "handling sessions". Sessions in JSF are exactly the same things as Sessions without JSF. The main differences are:
1. JSF may automatically construct a session if a backing bean is referenced in session scope - since obviously a session bean needs a session to live in!
2. JSF is more likely to need session-scope beans than traditional J2EE apps, so see #1.
3. JSF doesn't have an API that makes it easy to get to the raw HTTP service objects (HTTPServletRequest/Response and HttpSession). So a little extra code is required to directly access the Session itself. I usually define a service class to do that - it keeps server-specific code out of my beans, making them easier to test them offline.
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