This may not be relevant to you, but after hours of searching for the solution for a similar problem, my culprit turns out to be this file in WEB-INF/faces-config.xml :
For some strange reason JBoss Tools 3.3.0.M2 put that file in my JSF 2.0 project and BOOM! Nothing works. The file looks very innocent yet (probably due to version="1.2") it made me quite frustrated.
I've searched logs (nothing!), WEB-INF/lib, classpaths, even removing dependencies and it turned out to be a single faces-config.xml :-P
Hopefully this helps someone...
