Java Spring通过XMLBeans定义注册多个Hibernate数据源

目标：通过

@PersistenceContext

访问多个持久化单元/数据源

问题：SpringXML配置不流畅。注册多个数据源似乎需要多个EntityManagerFactory，这会导致一个错误，指出EntityManagerFactory不是唯一的。我尝试了两个entityManagerFactory，其中一个是抽象的父级，因为我无法在entityManagerFactory定义中添加多个数据源s。我怎样才能解决这个问题

我不能用SpringBoot或JPareposities。SpringJDBC和orm与版本4.3.4.RELEASE一起使用，SpringDataJPA与版本1.10.5.RELEASE一起使用

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'aDaoImpl': Injection of persistence dependencies failed; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'javax.persistence.EntityManagerFactory' available: expected single matching bean but found 2: entityManagerFactory,entityManagerFactory-2
    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.postProcessPropertyValues(PersistenceAnnotationBeanPostProcessor.java:357)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1219)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:551)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:754)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542)
    at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:128)
    at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:60)
    at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:108)
    at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:251)
    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98)
    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116)
    ... 24 more
Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'javax.persistence.EntityManagerFactory' available: expected single matching bean but found 2: entityManagerFactory,entityManagerFactory-2
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveNamedBean(DefaultListableBeanFactory.java:1034)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveNamedBean(DefaultListableBeanFactory.java:981)
    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.findDefaultEntityManagerFactory(PersistenceAnnotationBeanPostProcessor.java:579)
    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.findEntityManagerFactory(PersistenceAnnotationBeanPostProcessor.java:546)
    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor$PersistenceElement.resolveEntityManager(PersistenceAnnotationBeanPostProcessor.java:707)
    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor$PersistenceElement.getResourceToInject(PersistenceAnnotationBeanPostProcessor.java:680)
    at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:169)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.postProcessPropertyValues(PersistenceAnnotationBeanPostProcessor.java:354)
    ... 40 more

从服务到数据库的当前路径由以下文件组成。注意，这只显示了对一个数据源的尝试。解决上述错误后，将添加另一个

道：

使用Dao的测试：

@ContextConfiguration("classpath:beans-context.xml")
public class DaoTest extends AbstractTransactionalJUnit4SpringContextTests {

    @Autowired
    private Dao testable;

    @PersistenceContext(name= "puName") // tried unitName=... as well
    protected EntityManager em;

    ...

beans-config.xml：

...
<import resource="db-context.xml"/>
...

<context:component-scan annotation-config="true" base-package="path.to.package"/>
<import resource="db-context.xml"/>

更新：

使用组件扫描扩展spring配置不会更改错误

beans-config.xml：

...
<import resource="db-context.xml"/>
...

<context:component-scan annotation-config="true" base-package="path.to.package"/>
<import resource="db-context.xml"/>

更新：

---

方法注入而不是字段注入不会更改错误。

您的代码包含两个歧义：

@PersistenceContext

的单位分辨率

JpaTransactionManager

的单位分辨率

要解决

@PersistenceContext

的歧义，请使用

@PersistenceContext（unitName=…）

而不是

@PersistenceContext（name=…）

JpaTransactionManager

还需要提示，否则初始化会失败

Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'javax.persistence.EntityManagerFactory' available: expected single matching bean but found 2: entityManagerFactory,entityManagerFactory-2
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveNamedBean(DefaultListableBeanFactory.java:1034)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:340)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:335)
    at org.springframework.orm.jpa.EntityManagerFactoryUtils.findEntityManagerFactory(EntityManagerFactoryUtils.java:143)
    at org.springframework.orm.jpa.JpaTransactionManager.setBeanFactory(JpaTransactionManager.java:292)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeAwareMethods(AbstractAutowireCapableBeanFactory.java:1602)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1570)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
    ... 38 more

因此，解决歧义的一种方法是设置

persistenceUnitName

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="persistenceUnitName" value="puName" />
</bean>

您是否尝试过在bean定义和注入中添加名称？如果您无法使用存储库，为什么会将此标记为spring数据？@Jenschauder删除了错误的标记是的，谢谢！成功了。对于阅读本文的所有其他人：请注意@PersistenceContext与参数unitName的组合。这一点非常重要。

Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'javax.persistence.EntityManagerFactory' available: expected single matching bean but found 2: entityManagerFactory,entityManagerFactory-2
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveNamedBean(DefaultListableBeanFactory.java:1034)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:340)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:335)
    at org.springframework.orm.jpa.EntityManagerFactoryUtils.findEntityManagerFactory(EntityManagerFactoryUtils.java:143)
    at org.springframework.orm.jpa.JpaTransactionManager.setBeanFactory(JpaTransactionManager.java:292)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeAwareMethods(AbstractAutowireCapableBeanFactory.java:1602)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1570)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
    ... 38 more

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="persistenceUnitName" value="puName" />
</bean>