javax.persistence.PersistenceException: No Persistence provider for EntityManager named userPU

2021-09-14 22:38:30

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Exception in thread "main" javax.persistence.PersistenceException: No Persistence provider for EntityManager named userPU
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:69)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:47)

at com.test.usermanage.test.ClientEntity.main(ClientEntity.java:13)

今天写个jpa的Demo，创建实体管理器工厂时候一直报错。上百度找了找，
有的说hibernate-EntityManager.jar 没添加，
有的说少了jpa的提供者，需要加上<provider>org.hibernate.ejb.HibernatePersistence</provider>
还有的说jar版本不对，等......

解决方式：在resource文件夹下添加META-INF文件,然后把persistence.xml文件直接丢里面去,在获取实体管理器工厂,