EJB stands for Enterprise JavaBeans. It is a server-side component architecture that provides a framework for building scalable, distributed, and transactional enterprise applications using the Java programming language. EJBs are a part of the Java Enterprise Edition (Java EE) platform.
In simpler terms, EJB is a set of programming standards and APIs that allow developers to create reusable and modular business components for building enterprise applications. These components are managed by an application server, which provides services such as transaction management, security, and concurrency control.
EJBs are designed to simplify the development of enterprise applications by providing a high-level abstraction for common business tasks, such as database access, transaction management, and security. They encapsulate complex business logic and can be easily integrated with other EJBs and Java EE technologies.
There are three types of EJBs: session beans, entity beans, and message-driven beans. Session beans are used to encapsulate business logic and represent a single user's interaction with an application. Entity beans represent persistent data stored in a database. Message-driven beans handle asynchronous processing and message-based communication.
EJBs follow a container-managed model, where the application server is responsible for managing their lifecycle, concurrency, and transactions. This separation of concerns allows developers to focus on business logic without worrying about low-level system-level tasks.
Overall, EJB provides a powerful and standardized framework for building enterprise-grade Java applications, promoting reusability, scalability, and reliability.
