我已经“继承”了一个项目，该项目使用Spring批注来管理Hibernate的事务/会话。或至少是注定的。当前，Hibernate会话永远不会被刷新（它们设置为FLUSH_MODE_NEVER），并且DAO需要手动刷新才能将任何数据写入数据库。

同样，所有DTO对象都驻留在hibernate的内存中，最终导致OutOfMemory错误。

我相信我需要告诉Spring / Hibernate关闭会话或提交事务。在我的控制器类中，我具有带注释的方法来处理请求：

@Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
    ...
    ...
}

我相信我在applicationContetxt.xml文件中设置了hibernate事务管理器，并告诉spring使用注释：

<!-- hibernate3 transaction manager -->
<bean id="transactionManagerLocal" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
    <property name="dataSource" ref="${local.data.source}" />
    <property name="sessionFactory" ref="localSessionFactory" />
</bean>

<!-- Demarcate using @Transactional annotation -->
<tx:annotation-driven transaction-manager="transactionManagerLocal" order="200" />

我不仅可以确定配置是否错误，而且在没有手动调用每个DAO上的flush的情况下不会将数据写入数据库，从日志文件中我们还可以看到事务管理器已禁用了flushing和关闭会话关闭：

INFO  [http-8080-2] TransactionFactoryFactory - Transaction strategy: org.springframework.orm.hibernate3.SpringTransactionFactory
INFO  [http-8080-2] TransactionManagerLookupFactory - No TransactionManagerLookup configured (in JTA environment, use of read-write or transactional second-level cache is not recommended)
INFO  [http-8080-2] SettingsFactory - Automatic flush during beforeCompletion(): disabled
INFO  [http-8080-2] SettingsFactory - Automatic session close at end of transaction: disabled

要使Spring / hibernate自动刷新DAO和/或关闭会话以防止Hibernate使用大量内存，需要做些什么？

欢呼丹

<!-- MySQL/InnoDB session factory -->
<bean id="localSessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource" ref="${local.data.source}"/>
    <property name="mappingResources">
        <list>
            <value>net/company/projectname/domain/ExchangeRate.hbm.xml</value>
            <!-- Other  -->

        </list>
    </property>

   <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.MySQLInnoDBDialect</prop>
            <prop key="hibernate.cache.provider_class">org.hibernate.cache.NoCacheProvider</prop>
            <prop key="hibernate.connection.zeroDateTimeBehavior">convertToNull</prop>
            <!-- 
            DOES NOTHING
            <prop key="hibernate.transaction.flush_before_completion">true</prop>
            <prop key="hibernate.transaction.auto_close_session">true</prop>
            -->
        </props>
    </property>
</bean>

<!-- hibernate3 transaction manager -->
<bean id="transactionManagerLocal" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
    <property name="dataSource" ref="${local.data.source}" />
    <property name="sessionFactory" ref="localSessionFactory" />
</bean>


<!-- Demarcate using @Transactional annotation -->
<tx:annotation-driven transaction-manager="transactionManagerLocal" order="200" />

<bean id="exchangeRateDAO" class="net.company.project.dao.hibernate.impl.ExchangeRateDAOImpl">
     <property name="sessionFactory" ref="localSessionFactory"/>
 </bean>