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/524115#524115 Author : Pedro Gomes Profile : http://community.jboss.org/people/PedroGomes Message: -------------------------------------------------------------- True, that was the solution. As usual I didn't read the error with seeing eyes . I didn't notice the Jmx plug-in that was in the updates was from the Jboss tools, and it add a similar package signature to error.   Thanks for your time and help!! -------------------------------------------------------------- To reply to this message visit the message page: http://community.jboss.org/message/524115#524115