The trouble was the "Lookup" object. It was not working well. As this was an internal developed object, I replaced the lookup by this code that I found in "SACHA LABOUREY, BILL BURKE The JBoss Group JBoss AS Clustering" book. ... Properties p = new Properties(); p.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory"); p.put(Context.URL_PKG_PREFIXES, "jboss.naming:org.jnp.interfaces"); p.put(Context.PROVIDER_URL, "localhost:1100"); // HA-JNDI port. initialContext = new InitialContext(p); .... then I do initialContext.bind()... initialContext.rebind()... and it is working well. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4060881#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...