Deployment Descriptors (XML files)

Deployment is accomplished by specifying deployment descriptors (DDs) for standalone enterprise beans (EJB JAR files), front-end Web components (WAR files) and enterprise applications (EAR files). Deployment descriptors are used to resolve all external dependencies of the J2EE components/applications. The J2EE specification for DDs is common across all application server products. However, the specification leaves several deployment aspects of components pertaining to an application dependent on product-implementation.