EJB (Enterprise Java Beans) Introduction

Mr . Goni on EJB (Enterprise Java Beans)

• Enterprise beans an JEE components that implements EJB
• EJB run in EJB container
  • JEE server
  • EJB Container
  • Web container
  • Application client container
  • Applet container
• EJB is a server side component
• Written in the pure java programming language
• Encapsulates the business logic of an application
• Types of EJB(Enterprise Java Beans)
  • Session Bean
  • Message Driven
  • Note : Entity beans have been replaced by Java Persistence API entities.
• When we need EJB
  • If we need to scale our application and handle growing number of user
  • To distribute application in different machines
  • If we need to be sure about data integrity
  • flexible access of shared objects
  • In case of thin client implementation we can use EJB
  • When portability issue arise we will choose EJB as our implementation technology without re thinking