J2EE – ARCHITECTURE

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J2EE – ARCHITECTURE

 

The required relationships of architectural elements of the J2EE platform are shown in Figure J2EE.2-1. Note that this shows the logical relationships of the elements; it is not meant to imply a physical partitioning of the elements into separate machines, processes, address spaces, or virtual machines.

 

The Containers, denoted by the separate rectangles, are J2EE runtime environments that provide required services to the application components represented in the upper half of the rectangle. The boxes in the lower half of the rectangle denote the services provided.

 

For example, the Application Client Container provides Java Message Service (JMS) APIs to Application Clients, as well as the other services represented. All these services are explained below. See Section J2EE.2.6, “J2EE Standard Services”. The arrows represent required access to other parts of the J2EE platform.

 

The Application Client Container provides Application Clients with direct access to the J2EE required Database through the Java API for connectivity with database systems, the JDBCTM API. The EJB Container provides similar access to databases to JSP pages and servlets by the Web Container, and to enterprise beans. As indicated the APIs of the JavaTM 2 Platform, Standard Edition (J2SETM), are supported by J2SE runtime environments for each type of application component.

 



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