Question

我有一个配置文件persistence.xml，如下所述：

<?xml version="1.0" encoding="UTF-8" ?>
<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"
version="2.0" xmlns="http://java.sun.com/xml/ns/persistence">
<persistence-unit name="entity"
    transaction-type="RESOURCE_LOCAL">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    <exclude-unlisted-classes>false</exclude-unlisted-classes> 
         <validation-mode>NONE</validation-mode>
        <properties>
        <property name="javax.persistence.jdbc.driver"     value="org.apache.derby.jdbc.EmbeddedDriver" />
            <property name="javax.persistence.jdbc.url"
            value="jdbc:derby:src/test/resources/sql/entityDB;create=true" >
        <!-- EclipseLink should create the database schema automatically -->
        <property name="eclipselink.ddl-generation" value="create-tables" />
        <property name="eclipselink.ddl-generation.output-mode"
            value="database" />
        <property name="eclipselink.logging.level" value="ALL" />
    </properties>
</persistence-unit>

并将持久性代码加载为：

public static void main(String[] args) {      
    String persistenceUnit = "entity";
    Properties pros = new Properties();
    pros.setProperty(PersistenceUnitProperties.ECLIPSELINK_PERSISTENCE_XML,
        "src/test/resources/META-INF/persistence.xml");
    // Get the entity manager for the tests.
    entityManagerFactory = Persistence.createEntityManagerFactory(persistenceUnit,pros);
    entityManager = entityManagerFactory.createEntityManager();
    Query q = entityManager.createQuery("select * from entityTables");
    List<Entity> todoList = q.getResultList();

    entityManager.close();
}

但是，当我打电话给createEntityManagerFactory时，我得到了以下异常：

线程“main”中的异常javax.persistence.PersistenceException：没有EntityManager命名实体的持久性提供程序

我该如何解决？

Answer 1

在<persistence-unit name="entity" transaction-type="RESOURCE_LOCAL">之后，使用持久性提供程序名称：

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

编辑：或者在清单中放入这个包的类路径： - persistence.jar - eclipselink.jar

例外JPA德比配置为junit？

1 个答案: