Hey Adrian, Sorry, yes i know the error is not exactly in my code. But maybe you can still help me, I checked my code of com.thalys.localys.frontal.MessageTrainCreator.marshall , and inside i use jaxb-api.jar ... And one of the librairies i added in JBoss libs was axis-jaxrpc-1.4 . Could this be a problem and create my exception??? Could there be a library conflict. Thank you in advance. I guess this forum is not the place to solve my pb anymore, but we never know... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4084394#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...