Daniel Cullender [http://community.jboss.org/people/cullendw] 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/553321#553321 -------------------------------------------------------------- As mentioned previously, this is definitely a compatibility problem from jboss 4 to 5.1. Have you moved configuration directly from jboss 4 to jboss 5.1? This is just a guess, but maybe that unknown method is being invoked by reflection based on outdated configuration from jboss 4 ... -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/553321#553321] Start a new discussion in Beginner's Corner at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]