Ryan, I have vague idea of what had to be done. Instead of doing something and then waiting for people to complain I prefer to do the asking first. I hope you don't have problem with that. Now back to the topic... 1) The original tool creates a database of serialVersionUIDs for the classes found in the java "javax" package . Do we need this for JBossCache ? 2) Are there any known serialization issues between the different JBossCache versions ? If you know of such issues, please, let me know so I can blacklist the classes in question. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3992816#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...