As soon as you're done with your changes I will simplify it (if you haven't done so already). As we were talking on IRC, we could just set counter as (System.currentTimeMillis() & MASK_TIME) << 32), and aways get IDs from there with a simple counter.incrementAndGet(). That would be enough to guarantee uniqueIDs on the Node after a restart. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4178891#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...