I imagine the problem is with the serialization done for putting the data into the Berkeley cache. The thread name happens to be the async thread name. It doesn't seem to indicate a problem with the async component at all as the async component does no serialization. Do you know what object is being put? If you can share this, it's likely there's some sort of issue with that. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3983592#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...