I found the fix for this: add jboss-web.xml to the web context with a seperate classloader: | <class-loading java2ClassLoadingCompliance="false"> | <loader-repository> | seam.jboss.org:loader=<your-app-name> | <loader-repository-config>java2ParentDelegation=false</loader-repository-config> | </loader-repository> | </class-loading> | and add the richfaces-impl.jar to the ejb context (richfaces-api.jar and richfaces-ui.jar go into the root ear context) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4125516#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...