WAR files contain JSPs and servlets. EAR files can contain WAR files, hence Tomcat is involved there as well. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4140226#4140226 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4140226