Description: An application represents a J2EE application contained in a EAR file or EAR directory. The EAR file contains a set of components such as WAR, EJB and JMS JAR components, each of which can be deployed on one or more Roles. A Role is a set of server, with a server serving more than one Role. For example a Role may be the whole Domain, a set of servers that implement the role, or a specific server. These components might include EJBs, servlets, JMS destinations, WebLogic startup and shutdown classes.