spring+mybatis事务不回滚

yllplay

对spring,mybatis进行整合时发现事务不能进行回滚处理，上网查了很多资料依旧还没解释，很多都是说要抛出一个runtimeException才能回滚的，但尝试过多种还不能，代码如下：
applicationContext.xml

...
<!-- 定义易受环境影响的变量 -->
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" />
<property name="ignoreResourceNotFound" value="true" />
<property name="locations">
<list>
<value>classpath*:/jdbc.properties</value>
</list>
</property>
</bean>
<!-- 扫描业务组件 -->
<!-- 使用annotation 自动注册bean,并保证@Required,@Autowired的属性被注入 -->
<context:component-scan base-package="com.myframe" />
<context:component-scan base-package="com.topone" />
<!-- 数据源配置, 使用应用中的DBCP数据库连接池 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<!-- Connection Info -->
<property name="driverClassName" value="${jdbc.driverClassName}" />
<property name="url" value="${jdbc.databaseurl}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<!-- Connection Pooling Info -->
<property name="initialSize" value="${dbcp.initialSize}" />
<property name="maxActive" value="${dbcp.maxActive}" />
<property name="maxIdle" value="${dbcp.maxIdle}" />
<property name="maxWait" value="${dbcp.maxWait}" />
</bean>
<!-- jdbcTemplate -->
<bean id="jdbcTemplate"  class="org.springframework.jdbc.core.JdbcTemplate">
<constructor-arg>   
<ref bean="dataSource" />   
</constructor-arg>  
</bean>
<!-- define the SqlSessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="typeAliasesPackage" value="com.myframe,com.topone" />
<property name="configLocation" value="classpath:/spring/mybatis_configuration.xml"/>
<property name="mapperLocations">
<list>
<value>classpath*:com/myframe/security/mapper/*.xml</value>
<value>classpath*:com/topone/**/**/mapper/*.xml</value>
</list>
</property>      
</bean>
<!-- scan for mappers and let them be autowired -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.myframe,com.topone" />
</bean>
<bean id="gridDao" class="com.myframe.admin.grid.GridDaoImpl">
<property name="sqlSessionFactory" ref="sqlSessionFactory" />
</bean>

<!-- transaction manager, use JtaTransactionManager for global tx -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<!--  使用annotation定义事务-->  
<tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true" />
...


BolgService:

@Service
@Transactional(rollbackFor=Exception.class)
public class BlogService {
@Autowired
private BlogMapper blogMapper;
@Autowired
private BlogflowService blogflowService;
//保存数据
@Transactional(propagation=Propagation.REQUIRED, isolation=Isolation.READ_COMMITTED, readOnly=true)
public String save(Blog entity, Map<String,String> map) throws Exception{
...
int isok = blogMapper.save(entity); //没发生回滚
BlogFlow vo = new BlogFlow();
//get/set方法
vo.setId();
...
blogflowService.save(vo);         //调用blogflowService保存方法
...
}
}


BolgFlowService:

@Service
@Transactional(rollbackFor=Exception.class)
public class BlogflowService {
@Autowired
private BlogMapper blogflowMapper;
//保存数据
@Transactional(propagation=Propagation.REQUIRED, isolation=Isolation.READ_COMMITTED, readOnly=true)
public String save(Blog entity, Map<String,String> map) throws Exception{
...
entity.setTouserid(null);  //故意设置为null，抛出异常
int isok = blogflowMapper.save(entity);
...
}
}


查看数据库后，由于bolgFolw设置为null了，抛出异常，所以没有增加到数据库，但bolgService里已经将一条记录添加数据库里了，没有发生回滚事件，请问是那里的设置出问题了呢，如果用编码式来控制的话是可以回滚的。估计应该是配置或代码写得不对的问题，但看了别人的例子，也是这样写的，不明白原因在那里。
另外，我是用*mapper.java这种方式来实现dao层来。
目录路径为：

com
topone
approval      
blog   
service
mapper
contorller
entity
blogflow
service
mapper
contorller
entity