It seems that EL Function which serialized to ViewState can't be resolved when the object is deserialize. Because the jboss-el directly use "Class#forName(String)". The code is as follows,
I think the above code cause ClassLoader Scope Problem. "Thread.currentThread().getContextClassLoader()" should be used.
I found the jboss-el already had utility method for "Class.forName". It's "ReflectionUtil#forName(String)" method. Please use this method.