First, remove the default ROOT application. In 5.1.0 it is at server/xxx/deploy/ROOT.war.
Second, create a WEB-INF/jboss-web.xml file within your WAR with this content:
Instead of removing ROOT.war, you could add a jboss-web.xml file to it with a different context-root, or simply rename it. For example, if you rename it to jbossroot.war, you can still access it via http://hostname:8080/jbossroot
Peter, thank's for your help...