Yup, It is serializable: | import org.jboss.cache.aop.annotation.Serializable; | | public class AssessmentRequest implements Serializable { | The AssessmentRequest class just contains Strings and a Date class as member variables. If I start with an empty cache and fill the nodes, its get replicated with *no issues* at all. The only issue I have is this initial state transfer not working! I don't need the fine-grained replication features of the Pojocache so opted out of using that. Ray. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4049390#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...