B2B Integration : A Practical Guide to Collaborative E-commerce

Middleware Technologies 249
extension of the client application. Since these beans can be persisted,
they are often referred to as Persistent Session Beans.
Entity beans
An entity bean is persistent once it is created, until it is explicitly
deleted. Entity beans represent specific persistent data, which is
maintained in a database and the methods for acting on that data. Entity
beans typically correspond to a database table row with a single row
representing a single bean instance. The primary key for that row will
provide the identification for that bean. Interaction with the database
can be through the EJB container (container-managed) or handled directly
by the bean through embedded SQL (bean-managed).
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ENTITY BEANS PROPERTIES
Persistent;
Handles multiple clients;
Transactional;
Survives server crash;
Represents data in a database, along
that data;
Exposes its identity as primary key;
Has finder method; and
In a relational database context , there
a table.
8.4.6. J2EE application servers
with the methods to
act
on
is one bean for each row in
In the following section, we will discuss two of the most popular J2EE
compliant application servers.
IBM WebSphere
WebSphere is actually a series of products offered by IBM. The
cornerstone of the WebSphere product suite is the WebSphere Application