Hi, I don't take care about this, but now I think it's important ! The classloader is looking for the class : si3si.metier.quartierforce.client.vo.VoAdrEml and si3si.metier.quartierforce.client.vo.VoAdrEmlBeanInfo which doesn't appears anywhere inside de source code, is one library generating java code at runtime (*BeanInfo.java) ? A begining of explanation : A *BeanInfo class is generated during the busyness execution os when the Vo is given to the WebApp, it want to unserialize a class (Vo*BeanInfo) which isn't in the classpath ... but the question is WHO is doing the code generation ! Still investigating ... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3958458#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...