Enterprise Java Beans
Enterprise Java Beans (EJB) is a server-side component architecture for building scalable, transactional, and secure enterprise applications in Java. It provides a framework for developing distributed business logic, handling persistence, messaging, and concurrency, typically deployed within a Java EE (now Jakarta EE) application server. EJB simplifies complex enterprise development by managing infrastructure concerns like security, transactions, and resource pooling.
Developers should learn EJB when building large-scale, mission-critical enterprise applications that require robust transaction management, security, and scalability, such as banking systems, e-commerce platforms, or enterprise resource planning (ERP) software. It is particularly useful in environments where integration with other Java EE technologies (like JPA or JMS) is needed, and when deploying to application servers like WildFly, IBM WebSphere, or Oracle WebLogic. However, for modern microservices or lightweight applications, alternatives like Spring Boot are often preferred due to their simplicity and flexibility.