I'm working on jboss-4.2.0.GA,I have also
richfaces-impl-3.1.0-rc2.jar,
richfaces-ui-3.1.0-rc2.jar and
richfaces-api-3.1.0-rc2.jar bundled in my war of the application as mentioned in http://www.jboss.com/index.html?module=bb&op=viewtopic&t=112220&start=10
Using jsp without facelets.