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COMPONENTS IN PRESENTATION LOGIC LAYER (SERVLET. (servlet handle the…
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Business Logic Layer
Session Beans
session bean encapsulates business logic that can be invoked programmatically by a client over local, remote, or web service client views.
For example, a session bean could calculate taxes for a billing invoice.
Entity Beans
Entity beans represent persistent objects, such as a database row (JDBC)
For example, the developer might translate a customer table, invoice table, and order table
Message-Driven Beans
Message-driven beans are persistent objects that are likely to call a full range of JDBC interfaces, much like entity beans.
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