EJB basics

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What is EJB

Portable, reusable, scalable business applications Platform

Why choose EJB

1. Ease of use, the EJB container provides many services, developers only need to focus on the business itself

2. Integrated solution suite, with a large number of services provided by the application server

3. Open JavaEE standards

4. Extensive vendor support

5. Stable, high quality Code base

6. Clustering, load balancing, failover

7. Easy development allowing reusable components

Services provided by EJB containers

1. Integration

2. Pooling

3. Thread safety

4. State management (for stateful session beans)

5. Message server (for message-driven beans)

6. Transaction

7. Security

8. Interceptor

9. Remote access

10. Web service

11. Persistence

12. Caching

13. Performance optimization

EJB3.X’s new features

1. Simplify the program design model, based on POJO design

2. Support annotations

3. Support dependency injection and JNDI

4. Simplified persistence API

5. POJO components that can be unit tested

Reference

EJB 3 in Action, Second Edition

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