"ben.wang(a)jboss.com" wrote : 1. Is it reproducible? | 2. I have noticed that there is concurrent worker in the stack trace. Are you updating the POJO concurrently? What is the update pattern? POJO is supposed to have long lifetime under PojoCache. 1. Yes, but we can reproduce it in our project only. 2. What you mean "updating the POJO concurrently"? If you mean second server - no we have not another cache server. But we can use common resources from different threads. We have get libraries from URL http://jaist.dl.sourceforge.net/sourceforge/jboss/jboss-cache-dist-1.4.0.... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3958108#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...