Spring + Hibernate + DB2 + JTA + XA应用程序中的死锁

Question

应用程序日志中的异常：

12:04:18,503  INFO ExceptionResolver:30 -  [ org.springframework.dao.DeadlockLoserDataAccessException ] Hibernate flushing: could not update: [sero.chase.integration.Beans.Bean#1000]; SQL [update SCHM.v***240u_bean set prop1=?, prop2=?, prop3=?, prop4=?, prop5=?, prop6=?, prop7=?, prop8=?, prop9=?, prop10=?, prop11=?, prop12=?, prop13=?, prop14=?, prop15=?, prop16=?, prop17=?, prop18=?, prop19=?, prop20=?, prop21=?, where bean_id=?]; UNSUCCESSFUL EXECUTION CAUSED BY DEADLOCK OR TIMEOUT. REASON CODE 00C90088, TYPE OF RESOURCE 00000302, AND RESOURCE NAME SCHM.SAKT240 .X'000017'. SQLCODE=-913, SQLSTATE=57033, DRIVER=3.53.70; nested exception is com.ibm.db2.jcc.b.SqlException: UNSUCCESSFUL EXECUTION CAUSED BY DEADLOCK OR TIMEOUT. REASON CODE 00C90088, TYPE OF RESOURCE 00000302, AND RESOURCE NAME SCHM.SAKT240 .X'000017'. SQLCODE=-913, SQLSTATE=57033, DRIVER=3.53.70org.springframework.dao.DeadlockLoserDataAccessException: Hibernate flushing: could not update: [sero.chase.integration.Beans.Bean#1000]; SQL [update SCHM.v***240u_bean set prop1=?, prop2=?, prop3=?, prop4=?, prop5=?, prop6=?, prop7=?, prop8=?, prop9=?, prop10=?, prop11=?, prop12=?, prop13=?, prop14=?, prop15=?, prop16=?, prop17=?, prop18=?, prop19=?, prop20=?, prop21=?, where bean_id=?]; UNSUCCESSFUL EXECUTION CAUSED BY DEADLOCK OR TIMEOUT. REASON CODE 00C90088, TYPE OF RESOURCE 00000302, AND RESOURCE NAME SCHM.SAKT240 .X'000017'. SQLCODE=-913, SQLSTATE=57033, DRIVER=3.53.70; nested exception is com.ibm.db2.jcc.b.SqlException: UNSUCCESSFUL EXECUTION CAUSED BY DEADLOCK OR TIMEOUT. REASON CODE 00C90088, TYPE OF RESOURCE 00000302, AND RESOURCE NAME MWIAKT1 .SAKT240 .X'000017'. SQLCODE=-913, SQLSTATE=57033, DRIVER=3.53.70
    at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.doTranslate(SQLErrorCodeSQLExceptionTranslator.java:265)
    at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:72)
    at org.springframework.orm.hibernate3.HibernateTransactionManager.convertJdbcAccessException(HibernateTransactionManager.java:805)
    at org.springframework.orm.hibernate3.HibernateTransactionManager.convertHibernateAccessException(HibernateTransactionManager.java:791)
    at org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:664)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:723)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:393)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:120)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
    at $Proxy54.save(Unknown Source)
    at sero.chase.integration.DaoImpl.ExampleDaoImpl.save(ExampleDaoImpl.java:151)
    at sero.chase.business.BOImpl.ExampleBOImpl.save(ExampleBOImpl.java:191)
    at sero.chase.ServicesImpl.ExampleServiceImpl.submitAnswer(ExampleServiceImpl.java:183)
    at sero.chase.business.BusDelegatesImpl.ExampleBusDelegateImpl.gradeAnswer(ExampleBusDelegateImpl.java:578)
    at sero.chase.presentation.Controller.ExampleController.gradeAnswer(ExampleController.java:326)
    at sero.chase.presentation.Controller.ExampleController.SubmitAnswer(ExampleController.java:422)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at org.springframework.web.servlet.mvc.multiaction.MultiActionController.invokeNamedMethod(MultiActionController.java:471)
    at org.springframework.web.servlet.mvc.multiaction.MultiActionController.handleRequestInternal(MultiActionController.java:408)
    at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
    at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:900)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1152)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1087)
    at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:118)
    at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:87)
    at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:840)
    at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:683)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:589)
    at com.ibm.ws.wswebcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:534)
    at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:90)
    at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:751)
    at com.ibm.ws.wswebcontainer.WebContainer.handleRequest(WebContainer.java:1478)
    at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:126)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:458)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:387)
    at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:102)
    at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
    at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
    at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
    at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:136)
    at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:196)
    at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:751)
    at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:881)
    at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1497)
Caused by: com.ibm.db2.jcc.b.SqlException: UNSUCCESSFUL EXECUTION CAUSED BY DEADLOCK OR TIMEOUT. REASON CODE 00C90088, TYPE OF RESOURCE 00000302, AND RESOURCE NAME MWIAKT1 .SAKT240 .X'000017'. SQLCODE=-913, SQLSTATE=57033, DRIVER=3.53.70
    at com.ibm.db2.jcc.b.bd.a(bd.java:679)
    at com.ibm.db2.jcc.b.bd.a(bd.java:60)
    at com.ibm.db2.jcc.b.bd.a(bd.java:127)
    at com.ibm.db2.jcc.b.fm.b(fm.java:2132)
    at com.ibm.db2.jcc.b.fm.c(fm.java:2115)
    at com.ibm.db2.jcc.t4.db.k(db.java:353)
    at com.ibm.db2.jcc.t4.db.a(db.java:59)
    at com.ibm.db2.jcc.t4.t.a(t.java:50)
    at com.ibm.db2.jcc.t4.tb.b(tb.java:200)
    at com.ibm.db2.jcc.b.gm.Zb(gm.java:2445)
    at com.ibm.db2.jcc.b.gm.e(gm.java:3287)
    at com.ibm.db2.jcc.b.gm.Rb(gm.java:612)
    at com.ibm.db2.jcc.b.gm.executeUpdate(gm.java:595)
    at com.ibm.ws.rsadapter.jdbc.WSJdbcPreparedStatement.executeUpdate(WSJdbcPreparedStatement.java:768)
    at org.hibernate.jdbc.NonBatchingBatcher.addToBatch(NonBatchingBatcher.java:23)
    at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2399)
    at org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:2303)
    at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2603)
    at org.hibernate.action.EntityUpdateAction.execute(EntityUpdateAction.java:92)
    at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:248)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:232)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:140)
    at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)
    at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
    at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
    at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
    at org.hibernate.transaction.JTATransaction.commit(JTATransaction.java:135)
    at org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:656)
    ... 50 more

Spring配置：

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:jee="http://www.springframework.org/schema/jee" 
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans         
                           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd         
                           http://www.springframework.org/schema/context         
                           http://www.springframework.org/schema/context/spring-context-3.0.xsd
                           http://www.springframework.org/schema/jee
                           http://www.springframework.org/schema/jee/spring-jee-3.0.xsd">

    <jee:jndi-lookup id="queueConFac" resource-ref="true" jndi-name="jms/queueConFac" />
    <jee:jndi-lookup id="receiveQ" resource-ref="true" jndi-name="jms/receiveQ" />
    <jee:jndi-lookup id="sendQ" resource-ref="true" jndi-name="jms/sendQ" />
    <jee:jndi-lookup id="XA" resource-ref="true" jndi-name="jdbc/XA" />
    <jee:jndi-lookup id="nonXA" resource-ref="true" jndi-name="jdbc/nonXA" />


    <bean id="jmsTxManager"
    class="org.springframework.transaction.jta.WebSphereUowTransactionManager"/> 

    <bean id="jmsDestResolver" class=" org.springframework.jms.support.destination.JndiDestinationResolver"/>   

    <bean id="exampleListener" class="sero.chase.integration.JMS.Services.JMSReceiver">
        <property name="exampleAppBusDelegate" ref="exampleAppBusDelegate" />
    </bean>

    <bean class="org.springframework.jms.listener.DefaultMessageListenerContainer" >
        <property name="connectionFactory" ref="queueConFac" />
        <property name="destination" ref="receiveQ" />
        <property name="messageListener" ref="exampleListener" />
        <property name="transactionManager" ref="jmsTxManager" />
        <property name="taskExecutor" ref="jmsTaskExecutor" />
    </bean>

    <bean id="jmsTaskExecutor"
      class="org.springframework.scheduling.commonj.WorkManagerTaskExecutor">
      <property name="workManagerName" value="wm/default" />
   </bean>

   <bean id="jmsSender" class="sero.chase.integration.JMS.Services.JMSSender">
        <property name="connectionFactory" ref="queueConFac" />
        <property name="queue" ref="sendQ" />
    </bean>

    <bean id="localeResolver"
        class="org.springframework.web.servlet.i18n.SessionLocaleResolver">
        <property name="defaultLocale" value="en" />
    </bean>

    <bean id="localeChangeInterceptor"
        class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor">
        <property name="paramName" value="language" />
    </bean>

    <bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping" >
        <property name="interceptors">
            <list>
                <ref bean="localeChangeInterceptor" />
            </list>
        </property>
    </bean>

    <bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
        <property name="basename" value="WEB-INF/resources/langSpecificText"/>
    </bean> 

    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass"
            value="org.springframework.web.servlet.view.tiles2.TilesView" />
    </bean>

    <bean id="tilesConfigurer"
        class="org.springframework.web.servlet.view.tiles2.TilesConfigurer">
        <property name="definitions">
            <list>
                <value>/WEB-INF/tiles-def.xml</value>
            </list>
        </property>
    </bean>

    <bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
        <property name="jndiName" value="jdbc/nonXA" />
    </bean>

    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource"     ref="nonXA" />
        <property name="configLocation" value="classpath:/hibernate.cfg.nonXA.xml" />
        <property name="entityInterceptor">
            <bean class="sero.chase.integration.Hibernate.DB2Interceptor"/>
        </property>
    </bean>

    <bean id="session.XA.Factory"
        class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource"     ref="XA" />
        <property name="configLocation" value="classpath:/hibernate.cfg.XA.xml" />
        <property name="entityInterceptor">
            <bean class="sero.chase.integration.Hibernate.DB2Interceptor"/>
        </property>
    </bean>

    <bean id="transactionManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>

    <bean id="transaction.XA.Manager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="session.XA.Factory" />
    </bean>

    <bean id="transactionAttributeSource"
        class="org.springframework.transaction.interceptor.NameMatchTransactionAttributeSource">
        <property name="properties">
            <props>
                <prop key="*">PROPAGATION_REQUIRED</prop>
            </props>
        </property>
    </bean>

    <!-- App Bean Definitions (Two dao configurations excluding several other bean configurations are displayed below) -->

    <bean id="exampleDao"
        class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"
        lazy-init="true">
        <property name="transactionManager"         ref="transactionManager" />
        <property name="transactionAttributeSource" ref="transactionAttributeSource" />
        <property name="target">
            <bean class="sero.chase.integration.PersistenceImpl.ExamplePersistenceImpl">
                <property name="sessionFactory"     ref="sessionFactory" />
            </bean>
        </property>
    </bean>

     <bean id="exampleXADao"
        class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"
        lazy-init="true">
        <property name="transactionManager"         ref="transaction.XA.Manager" />
        <property name="transactionAttributeSource" ref="transactionAttributeSource" />
        <property name="target">
            <bean class="sero.chase.integration.PersistenceImpl.ExamplePersistenceImpl">
                <property name="sessionFactory"     ref="session.XA.Factory" />
            </bean>
        </property>
    </bean>

</beans>

Hibernate Non XA配置：

<hibernate-configuration>

        <session-factory>

             <property name="hibernate.dialect">
                sero.chase.integration.Hibernate.DB2390Dialect
            </property>

            <property name="hibernate.default_schema">SCHM</property>
            <property name="query.substitutions">yes 'Y', no 'N'</property>
            <property name="jdbc.use_streams_for_binary">true</property>
            <property name="show_sql">true</property>
            <property name="format_sql">true</property>
            <property name="transaction.factory_class">org.hibernate.transaction.JTATransactionFactory</property>
            <property name="jta.UserTransaction">java:comp/UserTransaction</property>

            <property name="hibernate.cache.provider_class">
                org.hibernate.cache.EhCacheProvider
            </property>

            <!--===============-->
            <!-- mapping files -->
            <!--===============-->

            <mapping resource="sero/chase/integration/hbm/Example.hbm.xml" />

        </session-factory>

    </hibernate-configuration>

Hibernate XA配置：

<hibernate-configuration>

        <session-factory>

            <property name="hibernate.dialect">
                sero.chase.integration.Hibernate.DB2390Dialect
            </property>

            <property name="hibernate.default_schema">SCHMA</property>
            <property name="query.substitutions">yes 'Y', no 'N'</property>
            <property name="jdbc.use_streams_for_binary">true</property>
            <property name="show_sql">true</property>
            <property name="format_sql">true</property>
            <property name="hibernate.transaction.factory_class">org.hibernate.transaction.CMTTransactionFactory </property>
            <property name="hibernate.transaction.manager_lookup_class">org.hibernate.transaction.WebSphereExtendedJTATransactionLookup</property> 

            <property name="hibernate.cache.provider_class">
                org.hibernate.cache.EhCacheProvider
            </property>

            <!--===============-->
            <!-- mapping files -->
            <!--===============-->

            <mapping resource="sero/chase/integration/hbm/Example.hbm.xml" />

        </session-factory>

    </hibernate-configuration>

来自我的服务实现类的代码片段，其中发生了大多数业务逻辑：

public void someDeadlockCausingServiceMethod() {
    //The read1() method below is going to executing a select hql statement on Table A once the call goes all the way down to the Dao layer.
    List<SomeBeanInBusinessLayer> beanList = exampleBO.read1();

    //Do some processing with the values obtained from the read1() method
    ...
    //

    //saveOrUpdate() method below is going to execute an update hql statement on Table A once the call goes all the way down to the Dao layer 
    //where the values from someBeanInBusinessLayer is going to be copied into someBeanInDaoLayer before saving.
    exampleBO.saveOrUpdate(someBeanInBusinessLayer)

    //The read2() method below is going to execute a select hql statement that contains two inner selects (on Table B, C and D) once the call goes all
    //the way down to the Dao layer.
    List<SomeBeanInBusinessLayer2> beanList2 = exampleBO.read2();

    //Do some processing with the values obtained from the read2() method inside a for loop
    for(SomeBeanInBusinessLayer2 s: beanList2) {

        //Read values from table E
        List<SomeBeanInBusinessLayer3> beanList3 = exampleBO.read3(s.getProp2());

        SomeBeanInBusinessLayer2 someBeanInBusinessLayer2 = new SomeBeanInBusinessLayer2();
        someBeanInBusinessLayer2.setProp1(s.getProp2());
        someBeanInBusinessLayer2.setProp1(someBeanInBusinessLayer3.getProp2());
        //... more processing...
        //Below method will execute an insert hql on Table F
        exampleBO.saveOrUpdate(someBeanInBusinessLayer2);

        SomeBeanInBusinessLayer3 someBeanInBusinessLayer3 = new SomeBeanInBusinessLayer3();
        someBeanInBusinessLayer3.setProp1(s.getProp5());
        //... more processing...
        //Below method will execute an insert hql on Table G
        exampleBO.saveOrUpdate(someBeanInBusinessLayer3);
    }
}

public void anotherDeadlockCausingServiceMethod() {
    //The read1() method below is going to executing a select hql statement on Table A once the call goes all the way down to the Dao layer.
    List<SomeBeanInBusinessLayer> beanList = exampleBO.read1();

    //The read2() method below is going to executing a select hql statement on Table F once the call goes all the way down to the Dao layer.
    List<SomeBeanInBusinessLayer2> beanList2 = exampleBO.read2();

    //The read1() method below is going to executing a select hql statement on Table G once the call goes all the way down to the Dao layer.
    List<SomeBeanInBusinessLayer3> beanList3 = exampleBO.read3();

    //Do some processing with the values obtained...

    //Do an update on Table A
    exampleBO.saveOrUpdate(someBeanInBusinessLayer1)

    //Do an update on Table F
    exampleBO.saveOrUpdate(someBeanInBusinessLayer2)
}

来自我的Dao layer1的代码片段：

public void load(BeanDTO beanDTO) {
    Object param1 = beanDTO.getBeanList().getProp1();
    Object param2 = beanDTO.getBeanList().getProp2();
    List<SomeBeanInDaoLayer> beanList = null;
    Object[] params = {param1, param2};
          UserTransaction ut = null;
    try {
      Context context = new InitialContext();
      ut = (UserTransaction) context.lookup(Constant.USR_TRANSACTION);
      ut.begin();   
            beanList = beanDao2.load(params);
            ut.commit();
    }
    catch(Exception e) {
                    try {
                         ut.rollback();
                    }
                    catch(Exception e1) {
                    if(logger.isDebugEnabled()) {
           logger.debug("DB Exception", e1);
        }
                    }
        int error = ExceptionResolver.resolve(e);
        if(logger.isDebugEnabled()) {
            logger.debug("DB Exception", e);
        }
        beanDTO.setErrorCode(error);
    }
    beanDTO.setBeanList(beanList);
}

public void save(BeanDTO beanDTO) {
    List<SomeBeanInDaoLayer> beanList = beanDTO.getBeanList();
    for(SomeBeanInDaoLayer bean: beanList) {
        try {
                      Context context = new InitialContext();
                ut = (UserTransaction) context.lookup(Constant.USR_TRANSACTION);
                ut.begin(); 
                      beanDao2.save(bean);
                      ut.commit();
        }
        catch(Exception e) {
                       try {
                         ut.rollback();
                       }
                       catch(Exception e1) {
                         if(logger.isDebugEnabled()) {
               logger.debug("DB Exception", e1);
             }
                       }
            int err = ExceptionResolver.resolve(e);
            if(logger.isInfoEnabled()) {
                logger.info("DB Exception", e);
            }
            beanDTO.setErrorCode(err);
        }
    }
}

来自Dao Layer2的代码片段：

public List<Bean> load(Object[] params) {
    String hql = "from Bean where beanProp1 = ? and beanProp2 = ?";
    return (List<Bean>) getHibernateTemplate().find(hql, params);
}

public void save(Bean bean) {
    getHibernateTemplate().saveOrUpdate(bean);
}

1. 此应用程序是一个测试系统，用户可以在其中进行测试 同时进行。
2. 最初，交易分界不是在我的Dao层，而是 在我的服务实现课上说（实际上一直都是我的 控制器类）其中包含多个读取和更新 begin-commit块中的一个事务。自从我看到了 几个死锁我把划界移到了Dao层 我的begin-commit块之间只有一个hql语句可以查看 如果它可以防止死锁，但没有运气。
3. 尝试设置属性，如hibernate.connection.autocommit to true，hibernate.transaction.flush_before_completion为true和 hibehibernate.transaction.auto_close_session为true但没有 运气。
4. 其他用户不会更新一个用户读取的行。每个用户 即使访问相同的行，也会读取和更新不同的行 DB2表。仅在运行构建过程的过程中 一组测试的问题，两个用户会读取相同的行，如果 他们正在进行相同类型的测试。它非常相似 someDeadlockCausingMethod上面描述了测试题 从一组包含问题和表格的表中准备 答案。从遍历for循环中的结果集开始， 将新行插入另一个表以保存每个表的详细信息 将出现在用户测试中的问题。这一步是必要的 在应用程序中，因为即使两个用户进行相同的测试， 从所有问题的池中取出一组随机问题 为每个用户。
5. 现在测试已准备好供用户参加测试，下一步 应用程序中的逻辑步骤是从表中读取行 其中只包含有关问题的详细信息 用户参加考试。因此并发用户将读取同一个表 在这个过程中，但从来没有相同的行。呈现用户 一次只提一个问题。一旦用户回答了问题，那么 读取的行以获得与此用户有关的问题 将使用答案选项进行更新。永远不会是相同的行 正在为两个并发用户进行更新。这个方法是 类似于上面描述的anotherDeadlockCausingMethod（）。
6. 我希望你知道应用程序的功能。这个事实 并发用户永远不会读取或更新相同的行 关于如何锁定资源让我感到惊讶。然后我想通了 页面锁定适用于表格更新。所以我 去问DBA他是否可以把它改成行锁定 正在更新的表格。他很担心 DB2实现行锁定的性能开销很令人担忧 如果它可能影响使用DB2的其他应用程序。所以他不想 除非我找不到任何其他解决方案，否则请这样做。
7. 请忘记XA / JMS部分。假设该部分被评论 暂时没有。对于大多数应用程序非XA 在我看到死锁的地方使用datasource。

   有人可以告诉我如何解决僵局？我想了解设计中出了什么问题。提前非常感谢任何帮助

Answer 1

当您执行多次插入，更新，删除时，我建议您添加

<property name="hibernate.connection.autocommit" value="false"/>

成功执行所有查询后，手动执行提交connection.commit(); 也许这可以帮到你。

Answer 2

最后，我做了一个没有死锁的干净运行，执行以下操作：

1. hibernate.connection.isolation = 2
2. 在我的select语句末尾添加了'for cs'更新。
3. 我正在使用saveOrUpdate（）hibernate方法进行更新和插入。现在，我使用save（）进行插入，使用update（）进行更新。

我不明白的一件事是为什么在我的select语句结尾处使用'with ur'与我现在使用的'with cs'相比没有解决死锁问题。想知道数据库的隔离级别是什么，“rs”必须对它做任何事情吗？