In eclipse jboss project "simple application".
I got this exception :
how can I solve this problem?
for tomcat deployment I would say : add JSF libs to class path.
but as you using Jboss I guess that you added JSF libs to your app and them conflicts with bundled ones. So disabled common Jboss libs(using WAR_BUNDLES_JSF_IMPL context-param) or remove your own from project.