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GlassFish Security by Masoud Kalali

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Understanding the EJB modules

We saw that a Web module is mostly responsible for interactive with users, including receiving the requests as HTTP methods, processing the requests, calling business logic when required to generate the response, and finally sending the generated response back to clients.

The EJB modules are simple ZIP files with JAR extension, with a predefined structure, formed by several Enterprise JavaBeans implementations, which are called enterprise beans. Three types of EJBs defined by the specification and supported by different application servers are Session Beans, Entity Beans, and Message-Driven Beans (MDB).

Message-Driven Beans are provided to process the JMS messages in the context of enterprise application to support ...

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