spring+mybatis异常不回滚

Question

代码如下：
applicationContext-mybatis.xml

 <bean id="sSF" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="mapperLocations" value="classpath:com/telchina/**/*.xml"></property>
    </bean>
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.telchina"></property>
        <property name="sqlSessionFactoryBeanName" value="sSF"></property>
    </bean>

    <!-- 事务管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" >
        <property name="dataSource" ref="dataSource" />
    </bean>
    <!-- 拦截器方式配置事务 -->
    <tx:advice id="transactionAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="*" propagation="REQUIRED" rollback-for="java.lang.RuntimeException"/>
        </tx:attributes>
    </tx:advice>
    <aop:config>
        <aop:pointcut id="transactionPointcut" expression="execution(* com.telchina.app.service.impl.*Impl.*(..))" />
        <aop:advisor pointcut-ref="transactionPointcut" advice-ref="transactionAdvice" />
    </aop:config>

 @Service("demoService")
public class DemoServiceImpl implements DemoService {
    @SuppressWarnings("rawtypes")
    @Override
    public String rollbackTest(List demoList) {
        // TODO Auto-generated method stub
        Iterator itr = demoList.iterator();
        while (itr.hasNext()) {
            Map demoMap = (Map) itr.next();
            demoMapper.updateDemo(demoMap);
            throw new RuntimeException("rollbackTest");
        }
        return "";
    }

}

List中传入了两个对象，总是能更新一个，事务不回滚，愁死了，求各位大侠指点！！！！

Answer 1

service有点长，没贴全，

 @Autowired
    private DemoMapper demoMapper;
    public void setDemoMapper(DemoMapper demoMapper) {
        this.demoMapper = demoMapper;
    }