EJB 2.0 VS EJB3.0

EJB3.0实体 bean 的简化与增强特性

最新推荐文章于 2025-11-30 18:24:05 发布

最新推荐文章于 2025-11-30 18:24:05 发布 · 224 阅读

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#EJB 2.0 VS EJB3.0 #java #工作

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EJB 2.0 VS EJB3.0

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本文概述了 EJB3.0 实体 bean 的简化部署描述符、注解使用、本地远程接口的取消、标准接口实现的减少、灵活的查询功能、插件式持久性提供者支持、安全性的提供方式、轻量级 POJO 实体的实现以及从 DAO 到实体 bean 的转换。

SUMMARY:

Removal of home interface enabled simple lookup process in ejb 3.0 
EJB deployment descriptors are not required in ejb3.0 
Annotations are used in ejb3.0 
EJB 3.0 entity beans don’t have home and remote interfaces. 
EJB 3.0 entity beans/JPA becomes local. Remote annotations are not at all supported for entity beans. 
EJB 3.0 beans don’t implement the standard interfaces like javax.ejb.SessionBean and hence no need to implement the container call back methods like ejbActivate() etc 
Query is very flexible. Multiple levels of joins are enabled through the refined EJB-QL 
Can be used with pluggable third party persistence providers 
Security can be provided either through annotations or through deployment descriptors 
POJO like EJB 3.0 entities become lightweight and easy to convert from a DAO to Entity bean or vice versa. Since EJB 3 entities don’t need implement any interface.

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GRAPHIC:

EJB2.0:

<img src="http://www.blogjava.net/images/blogjava_net/lotusswan/16319/o_EJB2.1.JPG" alt="">

EJB3.0:

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<img src="http://www.blogjava.net/images/blogjava_net/lotusswan/16319/r_EJB3.0.JPG" alt="">

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