In this article, I will discuss Types of Enterprise Java Beans (EJB). Basically, Enterprise Java Beans are software components that we use to develop distributed enterprise-level applications using Java EE technology. In fact, using EJB we implement the business logic of our application with each component performing a specific well-defined task.
The following section describes the types of Enterprise Java Beans
In brief, Enterprise Java Beans (EJBs) are components that we use to develop server-side Java applications in the Java EE (Java Enterprise Edition) platform. Basically, there are three main types of EJBs.
- Session Beans. In essence, Session Beans are used to represent business logic. Further they can be either stateful or stateless. Then again, Stateful Session Beans retain client state across multiple invocations. In contrast, Stateless Session Beans do not retain state.
- Entity Beans. Similarly, Entity Beans represent data. So, we use Entity Beans to interact with a database. Besides, Entity Beans can be either bean-managed or container-managed.
- Message-Driven Beans. Likewise, we use Message-Driven Beans to process messages sent to a JMS (Java Message Service) queue or topic. In fact, we use these beans to receive messages asynchronously and process them in a separate thread.
Each type of EJB is designed to perform a specific role in the development of Java EE applications, and they can be combined to build complex and scalable applications.Regenerate response
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