Java Reference
In-Depth Information
FIGURE 1-9. Java EE APIs in the EJB Container
Figure 1-10
shows the availability of the Java EE 6 APIs in the application client contain-
er.
FIGURE 1-10. Java EE APIs in the Application Client Container
The following sections give a brief summary of the technologies required by the Java EE
platform and the APIs used in Java EE applications.
Enterprise JavaBeans Technology
An
Enterprise JavaBeans (EJB) component
, or
enterprise bean
, is a body of code having
fields and methods to implement modules of business logic. You can think of an enterprise
bean as a building block that can be used alone or with other enterprise beans to execute
business logic on the Java EE server.
Enterprise beans are either session beans or message-driven beans.
• A
session bean
represents a transient conversation with a client. When the client
finishes executing, the session bean and its data are gone.
