Lance Goforth [http://community.jboss.org/people/lancetx] replied to the discussion "Upgrading JBoss 4.0 to 5.1 - application won't connect" To view the discussion, visit: http://community.jboss.org/message/553175#553175 -------------------------------------------------------------- No, I'm not including any older classes, or jboss classes at all.  I did check that.  I also tried recompiling all the server and client code with the new jbossall-client.jar.  I'm starting the jboss server with just the run command, but as I said it seems to be running fine - no errors.  My client application is a java application that connects to the application server via JNDI lookup.  It has no web or browser component at all. -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/553175#553175] Start a new discussion in Beginner's Corner at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]