Hi Brian, The important part of querycaching is updatetimestampscache which does require replication - otherwise hibernate will not be able to decide wether a result in the query cache is out-of-date or not. So it should be ok (i guess) :) Manik, Bela, Galder and I had a talk during JBW which I hope Manik will soon send out his notes for. The results of that meeting would probably help fix some of these things to. Saying that, I'm surprised to hear that JBC isn't able to use the applications current thread context classloader ?! I thought this were the way these serilaization issues were solved before ? Note, I don't think the serialization issues only occur for querycache - it would AFAIK also occur if a user has his own UserType in the id of his entities. /max View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3989195#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...