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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