EJB和JPA如何相关？ [英] How does EJB and JPA relate?

问题描述

我正在阅读Action 3中的EJB 3，我有以下问题：

您编写的POJO是用@Entity编写的，也是一个EJB实体类型的注释？

I am reading the EJB 3 in Action book and I have the following question :
Is the POJO's you write and annotate with @Entity and so on also a EJB entity type?

我不明白JPA与EJB有什么关系。 JPA现在不是一个自己的规范吗？实体也包含在自己的持久性容器中。他们谈论EJB 3 Java Persistence API等，但我不明白实体与EJB有什么关系。

I don't understand what JPA has to do with EJB. Isn't JPA a own specification now? The entities are also contained in a own persistence container. They talk about EJB 3 Java Persistence API etc. but I don't understand what entities has to do with EJB.

推荐答案

JPA已被设计为替换EJB2实体bean，并已作为EJB3规范的一部分启动。

JPA has been designed to replace EJB2 entity beans, and has started as a part of the EJB3 specification.

由于在EJB容器之外也使用JPA是有意义的，它现在有自己的规范，但它仍然与EJB3相关，因为兼容的EJB3容器必须提供一个JPA实现，它集成到容器的事务处理中。

Since it makes sense to also use JPA outside of an EJB container, it has now its own specification, but it's still related to EJB3, since a compliant EJB3 container has to provide a JPA implementation, which integrates into the transaction handling of the container.

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