Hi, Im using ver. 2.0.0.GA and didn't manage to reproduce it using a simple unit test, sorry. from my tests it seems that in JDBCCacheLoader class: private Map _put(Fqn name, Map attributes) allows two different FQN nodes to be inserted at the same time, but the problem is when both nodes trying to create the new subtree using addNewSubtree(name, attributes); View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4178192#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...