What is a hash set or tree set here? Something in DataModel? If this is as critical for your project as you say, you may want to consider buying official support from Red Hat. While the community does try its best to help on these forums, this is a "best effort" approach only. If you want a guaranteed response time and the like, buying official support is the way to go. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4135933#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...