Sorry, just noticed the following post from Brian on Oct. 30 that says JGroups 2.4 should be released in within a week: "bstansberry(a)jboss.com" wrote : Ah, I forgot. The -Djgroups.marshalling.compatible=true fix was added after 2.4.CR2. So you'd need to check out JGroups HEAD and build it, or wait for 2.4.GA, which should be out within a week. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3982101#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...