To add a little more to the "synchronized (MarshalFactory.class)" part of the code change: This is not meant to imply that there *is* a concurrency problem with MarshalFactory, just that we synchronized on it as a precaution since we are not well versed enough with the codebase to quickly determine if any problems exist, the short-term objective of the code change is to resolve the burning issue we hit in production and our hope is that the experts will have the time to take a look and determine the true source of the issues we are facing. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4126855#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...