What is EJB

Enterprise JavaBeans (EJB) is a server-side component architecture that simplifies
the process of building enterprise-class distributed component applications
in Java. By using EJB, you can write scalable, reliable, and secure
applications without writing your own complex distributed component
framework. EJB is about rapid application development for the server side;
you can quickly and easily construct server-side components in Java by leveraging
a prewritten distributed infrastructure provided by the industry. EJB is
designed to support application portability and reusability across any vendor’s
enterprise middleware services.
If you are new to enterprise computing, these concepts will be clarified
shortly. EJB is a complicated subject and thus deserves a thorough explanation.
In this chapter, we’ll introduce EJB by answering the following questions:

• What plumbing do you need to build a robust distributed object deployment?
• What is EJB, and what value does it add?
• Who are the players in the EJB ecosystem?
  

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