have you un-eared your ear just to make sure the jboss-seam.jar is there and defined in your application.xml?
I have checked that. I can see a jar file that is jboss-seam-2.0.3.CR1.jar.
I have defined it as a <java> module and an <ejb> module but neither works.
I read somewhere in a JiRA bugtrack that the problem was known but I didn't understand how to resolve it.
I think I have found something. But I am not sure it is a solution and if it is, I will be more than glad that someone explain it to me.
I have resolved the issue by converting my jar file to a folder. I.e. I extracted my ejb jar to a folder.
If anyone can help me on that one, it will be nice