We have to be very careful with our definition of "durable" when persisting on the client side. It may well be a much weaker level of durability than persisting on the server. Typically client machines might be basic desktop boxes with cheap hard disks not under the direct control of the IT department. Server boxes may well be highly reliable RAID arrays. We should therefore be very careful about saying we can guarantee reliable delivery just by persisting on the client side. Of course this depends on the individual setup but it's not always (and probably in most situations) is not an acceptable way to get durability. In some situations it may well be sufficient e.g. POS. But we should use this as a general technique. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3979891#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...