Hi again, actually, I have to apologise because my previous comment was not entirely correct. getChild() takes only the name of the direct child, so root.getChild("content/timestamp") and root.getChild(Fqn.fromString("content/timestamp")) should be return null as well. Only, root.getChild(Fqn.fromString("content")) or root.getChild("content") should not be returning null. What JBoss Cache version are you using? Wrt addChild(), that format is correct. As mentioned in the javadoc, it will take the fqn of the root and combine it with the one passed to it. It doesn't matter if the fqn is /griffin/peter or griffin/peter, both will work the same way: putting a new node under /griffin/peter. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4240232#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...