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GlassFish Security by Masoud Kalali

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Understanding a typical Java EE application

We briefly discussed the Java EE architecture and we said it consists of three main modules which are deployed in different application server containers. The Web module running inside the Web container sits in front of an EJB module deployed in the EJB (Enterprise Java Beans) container. The EJB module drives the system's business logic and provides transaction processing capabilities. This middle layer, which is formed by EJBs, may interact with a database or any other EIS (Enterprise Information System) through a connector module.

The last module is an application client module, which is a Java-based client application that directly interacts with middle layer through a specific container named Application ...

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