EJB 2.0 Drawbacks

• Complex Products
  
• Unmaintainable System
  
• Non-portable, frame-work committed business components
  
• Unpredictable System
  
• Why EJB 2.0 is complex / complicated?
  
  • Session bean - to write say hello method
    
    in EJB 2.x, you need to write
    home interface
    component interface
    bean
    
    in EJB 3.x, you need to write
    interface (with annotation)
    bean (with annotation)
    
    EJB 2.x; lookup is the only way to get server object/resource
    EJB 3; DI (dependency injection) & lookup are the available way
    
    
    there are more points. But basically, with EJB 3 responsibility of container is heavy & responsibility of developer is light weight; so that development is less & maintenance is easy.