I have an ear application with entity,business and web modules. <application ...> foo.par bar.ejb3 <web-uri>baz.war</web-uri> <context-root>/</context-root> The .par, .ejb3 and war files use classes in common.jar. I put the common.jar under /server/default/lib. In the common.jar, String className = System.getProperty("FooClassName"); Class.forName(className).newInstance(); trying to instantiate the package.Foo that is defined in web module inside the ear file, throws a exception: java.lang.ClassNotFoundException: No ClassLoaders found for: package.Foo the package.Foo is application specific and can not be put into common.jar that is a common library. However the common lib needs to instantiate the application specific class. How to solve this issue? Thanks for any help. Dave View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4131916#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...