There are issues with accessing a data source from a remote client. Looks like you just ran into one of them. I would guess that there is some issue with serializing an object that the JDBC driver created. Try adding the JDBC driver JAR file to your client's classpath. If that doesn't work, you will have to debug the problem to determine the actual cause and then decide how to fix it. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4175661#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...