Hi, the dump is when the jvm is continually running the gc. Yesterday I activated a log on the web connections. The only port reachable from the internet is the http port. In the night the server received less than 20 request. But the jvm run the gc every three seconds all night long. So it can't be something that's generated by requests. There is no JBossCache and I disabled the hibernate second level cache. The passivation occours on some stateful session beans. I'm really lost. It seems something internal to JBoss but can't understand what. Yesterday I also removed all the unneeded services but that don't helped. Any other hint ? Thank you View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4059020#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...