OK, this is very good topic which explains a lot to those who are using using MVC patterns and multiple WEB modules per enterprise application. You need to place MVC library into WEB-INF/lib of every module. If you don't do so and use your MVC library as utility jar inside enterprise application, your MVC controller will not be able to load and use classes placed inside WEB modules. Let me ask another question - more JBoss related. WAS5 (and higher) has ability to create single classloader for whole enterprise application. This means that all WEB modules and additional utility libraries are loaded in single classloader. Does JBoss support this funcionality? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4023102#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...