Hi, I think I understand now what is happening. When a schema validation occurs on an input message, the client that sent the incorrect message _does_ get the Soap fault. When the service itself constructs an XML reply that does not meet the schema requirements, the SaxException only ends up in the log and the client is left in the dark. Is this working as designed ? Cheers, Luc. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4174527#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...