I faced a problem which says that "Runtime exception - cannot find Faces Context"
I solved the problem .
I am using Eclipse 3.7 and Jboss 4.2.2 AS
The wrong thing i did was to include the JSF 1.2 Apache myfaces lib in to my project .
JBoss itself has jsf api installed and it conflicts with myfaces jsf api libraries .
If you included any jsf libraries into your project remove these . And remove any configurations that says anything about myfaces libraries in web.xml.
Wish that helps