Transactions. 1) Start a tx 2) Check if node is empty 3) If so, write to node 4) End tx View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4010012#4010012 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4010012