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Then the container uses the EJBObject to intercept the calls from the client to the bean instance. In other words, the client cannot have direct access to the bean instance; the client call is interrupted by the EJBObject associated with the bean instance and is routed to the bean instance by the container. So, when an EJB client is communicating with an entity bean or a session bean, there are two players in the middle of the client and the bean instance, and the client call goes to the bean instance through these two players: an EJBObject and the container.
Consequently, a naming and lookup mechanism is required to locate the components and services. The Java Naming and Directory Interface (JNDI) provides this mechanism. For example, a client program would use JNDI to find a service on another machine. Transaction service Managing the transactions for the application components is an important task. This task is accomplished in a platform-independent way using the Java Transaction API 10 CHAPTER 1 INTRODUCTION TO J2EE (JTA). For example, consider multiple clients accessing the database concurrently.
EJB pieces working together The job of a bean is to service the client call by executing an appropriate bean method. The client of a bean could be a simple Java program or another bean. However, a client cannot call the bean methods directly; the call will get to the bean only through mediators. The mediators are the JMS in the case of a message-driven bean and interfaces in the case of a session bean and an entity bean. The interfaces expose some methods implemented in the bean class. The container provides classes that implement the bean’s interfaces, which fall into two categories: component interfaces and home interfaces.