I did some testing about this. ear1.ear |-war1.war |-WEB-INF\A.jar(includes a.class) |-test.jsp war2.war |-WEB-INF\A.jar(includes a.class) ear1.ear, war1.war, war2.war use the same repository to share jars. when test.jsp call a.class, jsp will use a.class in the war2.war, not the war1.war. I don't know why, can i cannot understand it. thanks. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4170885#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...