One of Java's most important features is platform independence. Since its arrival, Java has been depicted as "write once, run anywhere". But Enterprise JavaBeans (EJBs) go one step further. They are not only platform independent but also implementation independent. That is, EJBs can run in any application server that implements the EJB specifications. In this overview, I discuss about the background, necessity and motivations for the emergence of EJBs in the enterprise distributed computing arena and a short EJB architectural overview.
Enterprise JavaBeans (EJB) technology is the server-side component architecture for Java Platform, Enterprise Edition (Java EE). EJB technology enables rapid and simplified development of distributed, transactional, secure and portable applications based on Java technology.
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This specification defines the new simplified EJB API targeted at ease of development. It also includes the new Java Persistence API for the management of persistence and object/relational mapping with Java EE and Java SE.
Java Persistence API
The Java Persistence API is the standard API for the management of persistence and object/relational mapping. It provides an object/relational mapping facility for application developers using a Java domain model to manage a relational database. The Java Persistence API is part of the Java EE platform. It can also be used in Java SE environments.
EJB 2.1 specification
This spec, created under the Java Community Process (JCP), enhances EJB architecture with support for Web services, making it easier to implement and deploy Web services applications based on Java technology.