Is this possible or would it be ever possible to redeploy dynamically the config files when it has been changed like I want to change the layout or render or pages portlet without to restart Jboss AS ?
Re-deploying the project.war(via ant) will undeploy the the old project.war, then deploy the new project.war. The server needs to undeploy the old project first then deploy the new one so that the config files are re-read. The only other way(i think?) would be if there was a stop-start feature (tomcat manager for example), which i don't think there is.