The java.io.OptionalDataException suggests to me that you have different versions of Remoting on the client side and server side. You can get the version of a Remoting jar as follows: java -jar jboss-remoting.jar Also, on the client side, besides jboss-remoting.jar, look for jbossall-client.jar, which bundles remoting, on your classpath. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4155506#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...