This would help be to debug the problem. You could send it to me directly: christian (at) kaltepoth (dot) det
BTW: I think the error message you are seeing looks a bit like it is created by Mojarra. Are you sure MyFaces is used? Mojarra is the default JSF implementation of JBoss 5.1 and is therefore bundled with the container. Or did you use org.jboss.jbossfaces.WAR_BUNDLES_JSF_IMPL to overwrite this?
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