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Sams Teach Yourself EJB in 21 Days by Krishna Kothapalli, Ragae Ghaly

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Understanding the J2EE Container Model

Containers are vital to J2EE components. Containers are the run-time environments that provide standard common services to the deployed components. Containers are implemented and offered by various vendors in the form of J2EE-compliant Application Servers. Containers also provide unified access to enterprise information systems, such as access to relational data through the Java Database Connectivity (JDBC) API, or to legacy systems through J2EE Connector Architecture (JCA) API. In addition, containers provide a declarative mechanism for configuring applications and components at assembly or deployment time through the use of deployment descriptors. Features that can be configured at deployment time include ...

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