I found out that if I remove the jsf-libs folder in jboss-web.deployer (deploy/jboss-web.deployer/jsf-libs) and remove the entries related to jsf in the web.xml file (deploy/jboss-web.deployer/conf/web.xml) everything starts up fine. It is not a very clean solution, but it is working for now. I don't understand what the interference problem could be, because as I said, we are not using JSF at all. If someone finds out the reason of the error, please, let us know. Thank you again, Jose Manuel Valladares View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4051236#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...