没有定义[javax.persistence.EntityManagerFactory]类型的唯一bean:期望的单个bean但找到了2

Question

我EntityManager为两个不同的数据库定义了两个bean.每个EntityManagerbean都指一个唯一的,各自<persistence-unit/>定义的persistence.xml.

Spring 2.x使用相同的代码和配置.当我升级到Spring 3时,我在服务器中部署应用程序时看到以下异常:

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No unique bean of type [javax.persistence.EntityManagerFactory] is defined: expected single bean but found 2

有人遇到过这个问题吗？升级到Spring 3时我错过了什么吗？我真的很感激任何回复.

我正在使用带有Hibernate和JPA的Spring 3.

问题不是含糊不清; 我正在声明两个EntityManagerFactorybean并按如下方式注入它们:

  <bean id="oracleJpaTemplate" class="org.springframework.orm.jpa.JpaTemplate">
   <property name="entityManagerFactory" ref="entityManagerFactory"></property>
  </bean>

  <bean id="sqlJpaTemplate" class="org.springframework.orm.jpa.JpaTemplate">
   <property name="entityManagerFactory" ref="sqlEntityManagerFactory"></property>
  </bean>

这是完整的堆栈跟踪:

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.flex.core.io.JpaHibernateConfigProcessor#0': Invocation of init method failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No unique bean of type [javax.persistence.EntityManagerFactory] is defined: expected single bean but found 2
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1412)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:322)
    ... 59 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No unique bean of type [javax.persistence.EntityManagerFactory] is defined: expected single bean but found 2
    at org.springframework.beans.factory.BeanFactoryUtils.beanOfTypeIncludingAncestors(BeanFactoryUtils.java:309)
    at org.springframework.flex.core.io.JpaHibernateConfigProcessor.afterPropertiesSet(JpaHibernateConfigProcessor.java:21)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1469)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1409)
    ... 66 more

Answer 1

像这样注入您的EntityManager:

@PersistenceContext(unitName = "unit1")
private EntityManager entityManager;

或者您的EntityManagerFactory如下:

@PersistenceUnit(unitName = "unit1")
private EntityManagerFactory entityManagerFactory;

(您可能需要 <context:annotation-config/>在此上下文中才能使用此功能)

Answer 2

我的问题解决了。spring-flex-core 库是罪魁祸首。我使用的版本 1.5.0.M1 不允许多个 EntityManagerFactories。当我使用1.5.0.RELEASE时，错误消失了。以下文章很有帮助 http://forum.springsource.org/showthread.php?100273-JpaHibernateConfigProcessor-complains-when-multiple-EntityManagers-present