Java Reference
In-Depth Information
Figure 1.1. Most traditional Enterprise applications have at least four layers: the presentation layer is the actual
user interface and can either be a browser or a desktop application; the business logic layer defines the business
rules; the persistence layer deals with interactions with the database; and the database layer consists of a relational
database such as Oracle database that stores the persistent objects.
EJB isn't a presentation layer or persistence-layer technology. It's all about robust support
for implementing business logic-layer components for Enterprise applications. Figure 1.2
shows how EJB supports these layers via its services.
 
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