最近遇到个问题，在方法上使用@Transactional，在spring.xml中也配置了事务，

<bean  id="portalTransactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="csportalDataSource" />
    </bean>

却报这个错误：

java.lang.IllegalStateException: No matching PlatformTransactionManager bean found for qualifier 'transactionManagerExt' - neither qualifier match nor bean name match!
    at org.springframework.transaction.interceptor.TransactionAspectUtils.getTransactionManager(TransactionAspectUtils.java:91)
    at org.springframework.transaction.interceptor.TransactionAspectUtils.getTransactionManager(TransactionAspectUtils.java:53)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.determineTransactionManager(TransactionAspectSupport.java:245)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:100)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:621)

最后才发现没有配置：

   <tx:annotation-driven transaction-manager="portalTransactionManager" order="0"/>

<tx:annotation-driven>这个配置的作用是开启注解功能。

transaction-manager指明了事务的来源，order指明了事物的执行优先级，order的值越小，优先级越高