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我在不使用 @PersistenceContext 的情况下将 EntityManager 注入 DAO 时遇到问题。

我正在开发一个具有两个 EntityManagerFactories 的应用程序，一个使用jndi数据源，另一个使用jdbc数据源。我必须在不使用@PersistenceContext 的情况下将EntityManager 注入DAO，因为我想对两个数据源使用相同的DAO。两个持久性单元都在同一个persistence.xml

我遵循的方法是：

persistenceContext-jdbc.xml

<tx:annotation-driven transaction-manager="demoTransactionManager" />
<bean id="demoEntityManagerFactory"
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="beanName" value="demoEntityManager" />
    <property name="dataSource" ref="dataSource" />
    <property name="persistenceUnitName" value="jdbcPersistence" />
    <property name="persistenceXmlLocation" value="classpath:META-INF/persistence.xml" />
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.OpenJpaVendorAdapter">
            <property name="showSql" value="true" />
            <property name="generateDdl" value="false" />
            <property name="databasePlatform" value="org.apache.openjpa.jdbc.sql.DB2Dictionary" />
        </bean>
    </property>
    <property name="loadTimeWeaver">
        <bean
            class="org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver" />
    </property>
</bean>

<bean id="demoDAO" class="com.test.dao.DemoDAO"
    <property name="demoEntityManager">
    <bean class="org.springframework.orm.jpa.support.SharedEntityManagerBean">
        <property name="entityManagerFactory" ref="demoEntityManagerFactory"/>  
    </bean>
    </property>
</bean>
<bean id="dataSource" class="org.springframework.jdbc.datasource.TransactionAwareDataSourceProxy">
    ....database properties....
</bean>

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

persistenceContext-jndi.xml

<bean id="demoEntityManagerFactory"
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="beanName" value="demoEntityManager" />
    <property name="persistenceUnitName" value="jndiPersistence" />
    <property name="persistenceXmlLocation" value="classpath:META-INF/persistence.xml" />
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.OpenJpaVendorAdapter">
            <property name="showSql" value="true" />
            <property name="generateDdl" value="false" />
            <property name="databasePlatform" value="org.apache.openjpa.jdbc.sql.DB2Dictionary" />
        </bean>
    </property>
</bean>

<bean id="demoDAO" class="com.test.dao.DemoDAO">
    <property name="demoEntityManager">
    <bean id="demoEntityManager" class="org.springframework.orm.jpa.support.SharedEntityManagerBean">
        <property name="entityManagerFactory" ref="demoEntityManagerFactory"/>  
    </bean>
    </property>
</bean>

虽然我能够为 jdbc 流注入 EntityManager。对于 jndi 流，我也面临同样的问题。

应用程序使用 spring 集成 (@ServiceActivator) 从 MQ 轮询消息。

以下是我得到的例外：

Setup of JMS message listener invoker failed for destination 'queue://<QueueName>' - trying to recover. Cause: Could not open JPA EntityManager for transaction; nested exception is <openjpa-2.2.2-r422266:1468616 nonfatal user error> org.apache.openjpa.persistence.InvalidStateException: You cannot access the EntityTransaction when using managed transactions.
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