We've ran into this problem as well. Setting UseJBossWebLoader=false won't completely fix the problem either, you'll need to make sure you're not specifying the a loader repository in jboss-web.xml either. We ran into this problem with Seam+Trinidad, and what happens is that Seam's FaceletsRenderer is setting the context class loader to a UCL. We were able to workaround it by re-implement the FaceletsRenderer with one that doesn't set the context class loader. Pete: is there any documentation describing the reasoning as to why Seam isn't supporting UseJBossWebLoader=true? I'd like to be more aware of the consequences if we do decide to continue on with that configuration. Thanks! Calvin View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4110365#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...