没有命名 EntityManager 的持久性提供程序 [英] No Persistence provider for EntityManager named

问题描述

我在 META-INF 目录下使用 TopLink 拥有同名的 persistence.xml.然后，我让我的代码调用它:

EntityManagerFactory emfdb = Persistence.createEntityManagerFactory("agisdb");

然而，我收到以下错误消息:

<前>2009-07-21 09:22:41,018 [main] 错误 - 名为 agisdb 的 EntityManager 没有持久性提供程序javax.persistence.PersistenceException:没有名为 agisdb 的 EntityManager 的持久性提供程序在 javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:89)在 javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:60)

这是persistence.xml:

它应该在类路径中.然而，我得到了上述错误.

解决方案

在后，定义持久化提供者名称:

org.hibernate.ejb.HibernatePersistence

I have my persistence.xml with the same name using TopLink under the META-INF directory. Then, I have my code calling it with:

EntityManagerFactory emfdb = Persistence.createEntityManagerFactory("agisdb");

Yet, I got the following error message:

2009-07-21 09:22:41,018 [main] ERROR - No Persistence provider for EntityManager named agisdb
javax.persistence.PersistenceException: No Persistence provider for EntityManager named agisdb
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:89)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:60)

Here is the persistence.xml:

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0">
    <persistence-unit name="agisdb">
        <class>com.agis.livedb.domain.AddressEntity</class>
        <class>com.agis.livedb.domain.TrafficCameraEntity</class>
        <class>com.agis.livedb.domain.TrafficPhotoEntity</class>
        <class>com.agis.livedb.domain.TrafficReportEntity</class>
        <properties>
            <property name="toplink.jdbc.url" value="jdbc:mysql://localhost:3306/agisdb"/>
            <property name="toplink.jdbc.driver" value="com.mysql.jdbc.Driver"/>
            <property name="toplink.jdbc.user" value="root"/>
            <property name="toplink.jdbc.password" value="password"/>
        </properties>
    </persistence-unit>
</persistence>

It should have been in the classpath. Yet, I got the above error.

解决方案

After <persistence-unit name="agisdb">, define the persistence provider name:

<provider>org.hibernate.ejb.HibernatePersistence</provider>

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