There is a Mojarra bug that breaks the new EPVC (JAVASERVERFACES-3151). This issue was patched in the mojarra impl that shipped with WildFly 8.0.0.Final, and in the Mojarra impl that shipped with EAP was also patched
We should have some code in place to fail fast if RichFaces 4.5 is used with an unpatched Mojarra. This can be achieved with reflection, looking for the method added in JAVASERVERFACES-3151
And we are not failing fast. I would say that when application is about to use unpached Mojarra, the fail fast would be a runtime exception during deployment ?