Using Session Beans

Enterprise JavaBeans (EJBs) are one of the most important and widely used component types in Java 2 Enterprise Edition (J2EE) applications. EJBs free component developers from implementing system-level services such as security, transactions, and instance management within the component code. Instead, EJBs are managed components that run within the realms of an EJB container and rely on the container for the aforementioned system-level services. The requirements of the previous services are defined outside the component source using Extensible Markup Language (XML) deployment descriptors. This allows component developers to focus on implementing the business logic, and the deployer can configure the runtime behavior of the component in terms of utilizing services, such as security, at deployment time by editing the deployment descriptor.