Don't construct an Fqn via the constructor. Do it like this: | cache.putObject(Fqn.fromString("/a"),null); | cache.putObject(Fqn.fromString("/a/b"),null); | cache.putObject(Fqn.fromString("/a/c"),null); | Note the presence of the leading '/'. The Fqn.fromString() method knows how to parse the string using the '/' separator. The Fqn constructor just assumes whatever object is passed to it is the name. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3974588#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...