没有persistence.xml的Spring 3.1提供"无法解析持久性单元根URL"

Question

我正在尝试使用没有persistence.xml的JPA EntityManagerFactory引导,这是Spring 3.1中的新功能(从M2开始),但是看起来spring仍在搜索persistence.xml文件,尽管packagesToScan指定了这个事实.

在context.xml中,entityManagerFactory因此配置:

<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>

但是在应用程序启动时,会出现PersistenceException"无法解析持久性单元根URL"消息:

...
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

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

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

工作得很好.那么我现在做错了什么呢？

编辑添加jpaVendorAdapter,错误仍然存​​在.

根据已删除的评论编辑已删除的persistenceUnitName; 将bean重命名为持久性单元名称(for @PersistenceContext)

更新此错误似乎取决于使用哪种应用程序上下文加载器.代码通过spring/junit测试@ContextConfiguration,但不是通过ClassPathXmlApplicationContext

Answer 1

我报告说,这是Spring的一个错误.

请注意,当所有类路径项都是jar时,它仅适用于打包的应用程序.这就是它在单元测试中没有失败的原因.