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

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Essential EJB Container Services

All EJB instances run within an EJB container. The container provides system-level services to its EJBs and controls their life cycle. Because the container handles most system-level issues, the EJB developer does not have to include this logic with the business methods of the enterprise bean. In general, J2EE containers provide three main types of services: common vertical services, common horizontal services, and common deployment tools (refer to Figure 1.4).

In the next few sections, we'll discuss the definition of these services. We'll discuss some of the services in detail in the following days.

Common Vertical Services

The common vertical services are inherent services that are provided by the EJB container ...

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