Enterprise JavaBeans (EJB): An Overview

Enterprise JavaBeans (EJB) is a server-side component architecture based on Java Platform which allows the building of Java based enterprise applications. Moreover, EJB is a server-side model, which encapsulates the business logic of an enterprise application.

Enterprise JavaBeans (EJB): An Overview


Enterprise JavaBeans (EJB): An Overview

Enterprise JavaBeans (EJB) is a Java Platform based server-side component architecture, which is used for the modular construction of enterprise applications based on Java.

Initially, EJB was developed by software giant IBM, which was then implemented by Sun Microsystems. Later Java Community released the advance versions of EJB namely EJB 2.0, EJB 2.1, EJB 3.0, EJB 3.1. The latest version of Enterprise JavaBeans is EJB 3.2.

Before going into the depth of learning EJB, there are certain concepts every aspirant should know about EJB.

EJB Server

EJB server is the EJB application server, which may be a web server, mail server, print server, database or any other server. An EJB application server accepts the connections in order to accept the requests and finally respond to the request. EJB Servers can be run remotely or can exist on the same computer in which the client application is running.

EJB Containers

EJB Containers are specific frameworks for EJB responsible to manage control and provide services. In common, there are five types of EJB Containers in which three types are server-side containers and the remaining two are client-side containers.

The Server-side containers comprise of the server itself and provide a proper environment to EJB. The other type of EJB server-side containers is responsible to manage the EJB components. The web container manages the servlets and JavaServer Pages.

The Client-side Containers consists a container for the familiar Java applications which initiates with java commands and an applet container or browser enabled with Java Plug-in.

Enterprise Beans

Enterprise bean is a server-side component installed in the EJB containers that encapsulates the business logic of an application. Deployment of Enterprise beans is done with an objective of using an application on large scale, which includes large amount of data accessing by number of users. In addition to that, Enterprise beans perform many other tasks as such interacting with clients, session maintenance for the clients, retrieving and holding data from the database and communicating with the server. There are three types of enterprise beans, entity beans, session beans, and message-driven beans.

EJB Resources:

Tutorials

  1. Send Email From JSP & Servlet
  2. Building a Simple EJB Application Tutorial
  3. DEVELOPING & DEPLOYING A PACKAGED EJB
  4. Java EJB 3.0 Tutorials
  5. Features of EJB 3.0
  6. Annotations
  7. Java Persistence API
  8. Message Driven Beans
  9. Web Services - Web Services Tutorials
  10. J2EE Tutorial - Introduction
  11. Java Persistence Example
  12. J2EE Tutorial - Session Tracking
  13. J2EE Tutorial - Running RMI Example
  14. J2EE Tutorial - Session Tracking Example
  15. A Message-Driven Bean Example
  16. J2EE Tutorial - RMI Example
  17. EJB remote interface
  18. Ejb message driven bean
  19. EJB lookup example
  20. EJB life cycle method
  21. EJB Interfaces
  22. EJB Insert data
  23. EJB deployment descriptor
  24. EJB create method
  25. EJB container services
  26. EJB Hello world example
  27. EJB directory structure
  28. Deleting a Row from SQL Table Using EJB
  29. Accessing Database using EJB
  30. Enterprise Beans
  31. Application Server
  32. Session Beans
  33. J2EE Tutorial - Java Bean
  34. Stateful Session Bean Example
  35. EJB Container or EJB Server
  36. EJB 3.0 Tutorials
  37. Stateless Session Bean Example
  38. Introduction to POJO (Plain Old Java Object) Programming Model
  39. Spring Batch Example
  40. init Method in Spring