Question

我已撰写了一份日本宇宙航行局项目,该项目涵盖我的所有实体。由于这两个实体也需要在教育、科学和技术部的服务项目中,我出口了JPA-项目,并将其列入教育、科学和技术部的项目(没有JPA-Facet)。

So everything can be deployed on the server and I can reach the REST-services from the frontend, but as soon as the EntityManager should be injected in a class nothing happens. This results in NullPointerExceptions since the entityManager is not present.

注射的班次为@Stateless和实体 Manager with the @PersistenceContext annotation.

因此,问题在于:投射是否在宽松的项目中工作,或者我是否必须当实体。管理人员人工操作吗?

Thanks in advance!

在添加剂方面,我使用了玻璃鱼诉3.1.2和JPA2.0。

Answer 1

Going to answer my own question. With the help of netbeans I gathered some information that made me change my project structure lightly.

这正是:

Giving the REST-Project the JPA-facet
Store the persistence.xml in that project
in the PU link to the jar which contains the entites

这样做的办法是通过注入实体。担任实体项目经理,我这样做!

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