hibernate - 没有persistence.xml的Spring 3.1给出 "Unable to resolve persistence unit root URL"

Question

我正在尝试使用 JPA EntityManagerFactory bootstrapping without persistence.xml ，这是 Spring 3.1 中的新内容(自 M2 起)，但似乎 spring 仍在搜索 persistence.xml 文件，尽管指定了 packagesToScan。

在 context.xml 中，entityManagerFactory 是这样配置的:

<bean id="my-persistence-unit"
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="persistenceProviderClass"
        value="org.hibernate.ejb.HibernatePersistence"/>
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>
    </property>
    <property name="jpaProperties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</prop>
        </props>
    </property>
    <property name="packagesToScan">
        <list>
            <value>my.package.name</value>
        </list>
    </property>
</bean>

但在应用程序启动时，会出现 PersistenceException 消息“无法解析持久性单元根 URL”:

...
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'my-persistence-unit' defined in class path resource [META-INF/context.xml]: 
...
Caused by: javax.persistence.PersistenceException: Unable to resolve persistence unit root URL
        at org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager.determineDefaultPersistenceUnitRootUrl(DefaultPersistenceUnitManager.java:429)
        at org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager.preparePersistenceUnitInfos(DefaultPersistenceUnitManager.java:327)
        at org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager.afterPropertiesSet(DefaultPersistenceUnitManager.java:309)
        at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:209)
        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:310)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1504)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1442)
        ... 34 more 
Caused by: java.io.FileNotFoundException: class path resource [] cannot be resolved to URL because it does not exist
        at org.springframework.core.io.ClassPathResource.getURL(ClassPathResource.java:179)
        at org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager.determineDefaultPersistenceUnitRootUrl(DefaultPersistenceUnitManager.java:426)
        ... 40 more

在我添加 packagesToScan 之前，我有一个最小的 persistence.xml，并设置 persistenceXmlLocation，如下所示:

<property name="persistenceXmlLocation"
    value="classpath:META-INF/persistence.xml"/>

效果很好。那我现在做错了什么？

edit添加了jpaVendorAdapter，错误依旧。

edit 根据已删除的评论删除了 persistenceUnitName；将 bean 重命名为持久性单元名称(对于 @PersistenceContext)

update 这个错误似乎取决于使用哪种应用程序上下文加载器。该代码通过 @ContextConfiguration 在 spring/junit 测试中工作，但不能通过 ClassPathXmlApplicationContext

Answer 1

这是Spring中的一个错误，我reported it .

请注意，当所有类路径项都是 jar 时，它只会发生在打包的应用程序中。这就是它在单元测试中不会失败的原因。