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我有一个No Persistence provider for EntityManager异常,无法弄清楚是什么原因造成的。这是我的配置文件:

Persistence.xml(存储在src/META-INF

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0"
    xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
    <persistence-unit name="HatifimJPA" transaction-type="RESOURCE_LOCAL">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <class>entities.HatUser</class>
        <properties>
            <property name="hibernate.connection.driver_class" value="oracle.jdbc.driver.OracleDriver" />
            <property name="hibernate.connection.username" value="Benny" />
            <property name="hibernate.connection.password" value="oracle" />
            <property name="hibernate.connection.url" value="jdbc:oracle:thin:@localhost:1521:xe" />
            <property name="hibernate.dialect" value="org.hibernate.dialect.OracleDialect" />
        </properties>
    </persistence-unit>
</persistence>

例外:

线程“主”javax.persistence.PersistenceException 中的异常:在 javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:69) 在 javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:47) 中没有名为 HatifimJPA 的 EntityManager 的持久性提供程序testing.TestClass.main(TestClass.java:16)

唯一的区别是我试图EntityManager进入一个public void main(...) { ... }街区,但是,我不记得过去这样做有问题。

谁能帮忙指出我的问题可能出在哪里?

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1 回答 1

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尝试将 persistence.xml 放入 src/main/resources/META-INF/ 并将此代码放入 main 方法:

EntityManagerFactory emf = Persistence.createEntityManagerFactory("HatifimJPA");
EntityManager em = emf.createEntityManager();
于 2012-10-09T14:21:38.933 回答