User development, A new message was posted in the thread "Error in Eclipse when adding server, saving properties, and publishing": http://community.jboss.org/message/524043#524043 Author : Denis Golovin Profile : http://community.jboss.org/people/dgolovin Message: -------------------------------------------------------------- Thank you for update. It looks like you need to update jmx feature plugins to CR1 and that should help.   Problem you have happens because JBoss AS tool has not declared version for jmx dependency in its manifest. It starts and seems to work until it gets to classes that was introduces in jmx tool since CR1, but you have jmx tool M4 and that's the reason of ClassNotFoundException, because jmx tool M4 just has no such classes. -------------------------------------------------------------- To reply to this message visit the message page: http://community.jboss.org/message/524043#524043