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J2EE™ and Beyond: Design, Develop, and Deploy World-Class Java™ Software by Art Taylor

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Business Tier Components

The J2EE specification describes an end-to-end environment for the development of enterprise applications—from client GUI libraries, to Web browsers, to Web servers running JSPs and servlets, to the business tier, to the resource tier.

Business tier components run on the middle tier and thus have historically been referred to as middleware. These components run within an application server, which provides the container for the components. As with applets, this container provides various services for the component: lifecycle management, pooling, security, and automatic failover.

Prior to the EJB specification, developers creating middleware components needed to write code to specifically manage the infrastructure and provide ...

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