J2EE Platform Technologies

The J2EE^TM platform specifies technologies to support multitier enterprise applications. These technologies fall into three categories: component, service, and communication.

The component technologies are those used by developers to create the essential parts of the enterprise application, namely the user interface and the business logic. The component technologies allow the development of modules that can be reused by multiple enterprise applications. The component technologies are supported by J2EE platform system-level services which simplify application programming and allow components to be customized to use resources available in the environment in which they are deployed.

Since most enterprise applications require access to existing enterprise information systems, the J2EE platform supports APIs that provide access to database, transaction, naming and directory, and messaging services. Finally, the J2EE platform provides technologies that enable communication between clients and servers and between collaborating objects hosted by different servers.

This chapter will provide an overview of the J2EE platform technologies.

In this chapter:

• Component Technologies
• Platform Roles
• Platform Service
• Service Technologies
• Communication Technologies
• Summary
• Questions and Answers