获取错误未定义[javax.persistence.EntityManagerFactory]类型的合格bean：需要一个匹配bean，但找到2个

Question

 <bean id="legacyDataSource" name="legacydb" class="org.springframework.jdbc.datasource.DriverManagerDataSource" lazy-init="true">
    <property name="driverClassName" value="${jdbc.legacy.driverClassName}" />
    <property name="url" value="${jdbc.legacy.url}" />  
    <property name="username" value="${jdbc.legacy.username}" />
    <property name="password" value="${jdbc.legacy.password}" />
</bean>

 <bean id="ls360DataSource" name="Ls360db" class="org.springframework.jdbc.datasource.DriverManagerDataSource" lazy-init="true" >
    <property name="driverClassName" value="${jdbc.ls360.driverClassName}" />
    <property name="url" value="${jdbc.ls360.url}" />  
    <property name="username" value="${jdbc.ls360.username}" />
    <property name="password" value="${jdbc.ls360.password}" />
</bean>

<bean id="legacyTransactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="legacyEmf"/>
</bean>

<bean id="ls360TransactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="ls360Emf"/>
</bean>

<tx:annotation-driven transaction-manager="transactionManager" />

<bean id="legacyEmf" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" >
    <property name="dataSource" ref="legacyDataSource" />
    <property name="jpaVendorAdapter" ref="vendorAdaptor" />         
    <property name="packagesToScan" value="com.softech.ls360.integration.regulators.plcb.domain"/>
    <property name="jpaProperties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</prop>
            <prop key="hibernate.max_fetch_depth">3</prop>
            <prop key="hibernate.jdbc.fetch_size">50</prop>
            <prop key="hibernate.jdbc.batch_size">10</prop>
            <prop key="hibernate.show_sql">true</prop>              
        </props>        
    </property>
</bean>   

<bean id="ls360Emf" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" >
    <property name="dataSource" ref="ls360DataSource" />
    <property name="jpaVendorAdapter" ref="vendorAdaptor" />         
    <property name="packagesToScan" value="com.softech.ls360.integration.regulators.plcb.domain"/>
    <property name="jpaProperties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</prop>
            <prop key="hibernate.max_fetch_depth">3</prop>
            <prop key="hibernate.jdbc.fetch_size">50</prop>
            <prop key="hibernate.jdbc.batch_size">10</prop>
            <prop key="hibernate.show_sql">true</prop>              
        </props>        
    </property>
</bean>
<context:component-scan base-package="....db" />

@Service("dbManager") 
@Repository
@Transactional
public class DatabaseManager {

    @PersistenceContext
    @Qualifier("legacyEmf")
    private EntityManager legacyEm;

    @PersistenceContext
    @Qualifier("ls360Emf")
    private EntityManager ls360Em;

    @SuppressWarnings("unchecked")
    @Transactional(readOnly=true)
    public List<Object> getResultList(String query, Class mappingClass) throws Exception {

        //Query emQuery = legacyEm.createNativeQuery(query, mappingClass);

        //return  emQuery.getResultList();
        return null;

    } //end of findTraineeFromLegacy()
}

Error creating bean with name 'dbManager': Injection of persistence 
dependencies failed; nested exception is 
org.springframework.beans.factory.NoUniqueBeanDefinitionException: 
No qualifying bean of type [javax.persistence.EntityManagerFactory] is defined: 
expected single matching bean but found 2: legacyEmf,ls360Emf

为什么我会犯这个错误。我该怎么解决呢？

谢谢

Answer 1

我今天也有同样的问题。解决方法如下：

首先，我向@PersistenceContext的两个实体管理器属性添加了参数unitName：

@PersistenceContext(unitName="appPU")
@Qualifier(value = "appEntityManagerFactory")
private EntityManager appEntityManager;

@PersistenceContext(unitName="managerPU")
@Qualifier(value = "managerEntityManagerFactory")
private EntityManager managerEntityManager;

在我的配置文件中，我为bean定义添加了一个属性persistenceUnitName：

<bean id="appEntityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource1" />
    <property name="persistenceUnitName" value="appPU" />
    <property name="packagesToScan" value="br.com.app.domain" />
    ...
</bean>

<bean id="managerEntityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource2" />
    <property name="persistenceUnitName" value="managerPU" />
    <property name="packagesToScan" value="br.com.app.domain" />
    ...
</bean>