Summary

Today, you explored the J2EE platform and the rationale behind its architecture. You learned about different type of containers and the common services that are available for use by the components hosted in that container. J2EE container is a runtime environment and provides several levels of abstractions. You also learned a brief description of the common services available in the J2EE platform. You recognized the J2EE modules necessary to build and deploy J2EE applications. We covered some of the design patterns used in the J2EE platform, such as the Session Façade and the Service Locator.