3.1. The client’s view

In this book, we will encouter some rather complex, and perhaps even intimidating, technology. To put it into context, I would like to begin by discussing how an EJB is seen by its clients. We will see that this is, in fact, quite straightforward. This is important, because EJBs are usefully viewed as providers of services to their clients: A service can be as complex as the needs of the application demand, but the provision of the service must be simple. For example, when I wish to make a telephone call, I know that I have to interact with the telecommunications system in a simple, well-defined way: I dial a number on the handset. This is my interface to the provision of the service. What happens inside the telephone ...

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