vettori, I noticed in your thread dump that a finalizer thread was running. What percentage of your allocated objects have finalizers? And what are the finalizers doing? Most of the other threads appeared to be simply waiting. Usually, taking a single thread dump is insufficient. You have to take multiple dumps in succession and examine the threads that changed state. I repeat my earlier suggestion to enlist professional help. philjboss, it is considered rude to hijack someone else's post with your own unrelated question. If you care to start a new post and repeat your question there, I will answer (though I warn you that you might not like my answer...). View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4064820#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...