I have two ears and two wars. i want to deploy then into one server and share the jars amongst the ears and wars. so i and this part to the jboss-app.xml and jboss-web.xml. <loader-repository> test.classloader:loader=test1.ear <loader-repository-config>java2ParentDelegation=false</loader-repository-config> </loader-repository> now i can share the jars amongst the ears and wars. my question is about the jar overwriting. if there are A.jar(includes a.class) in all war's WEB-INF/lib, and a.class in different A.jar are different version. when I call a.class in jsp file, which one will be used? who can tell me its rule? thank you very much. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4170696#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...