No unique bean of type [javax.persistence.EntityManagerFactory] is defined

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今天运行以前同事交接给我的老项目，是用struts2+spring+jpa搭建的，平常用ssh较多，jpa使用的较少，所以就遇到问题。

No unique bean of type [javax.persistence.EntityManagerFactory] is defined: expected single bean but found 0

最后的解决方法就是在web.xml中配置数据源的路径。因为没有配置数据源，也就没有定义EntityManagerFactory，所以也就不可能有bean。

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