将相同EJB和类的多个版本部署到同一JBoss服务器

I have a few separate application projects (EARs) with multiple EJBs that I want to deploy to the same JBoss server. Now, some of the projects may have the same EJBs, but different versions. In similar circumstances, some projects may use different versions of the same "ordinary" classes (i.e. classes loaded within VM, without JNDI lookup).I have a few separate application projects (EAR