As for the other errors you see, we will need an exclusion list for classes that need not be compared, such as: | org.jboss.serial.objectmetamodel.DataContainer | As for classes such as | org.jboss.cache.marshall.JBCMethodCall | I have raised a JIRA task to set the svuid to be the same as previous 1.4.x releases. http://jira.jboss.com/jira/browse/JBCACHE-917 As for these classes: | org.jboss.cache.OptimisticTreeNode | org.jboss.cache.optimistic.DefaultDataVersion | org.jboss.cache.optimistic.FqnComparator | I have added a task to investigate these. Apart from DataVersion, they are not streamed and should not be serializable at all. For the 2.x.x series, I will make sure they are not serializable, and for 1.4.x, make sure they have compatible svuid props. See http://jira.jboss.com/jira/browse/JBCACHE-918 View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3996818#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...