spring 的DataSourceTransactionManager 事务回滚问题

<!-- 数据库连接池配置 -->

	<bean id="dataSource"

    	class="org.apache.commons.dbcp.BasicDataSource">

	    <property name="driverClassName"><value>oracle.jdbc.driver.OracleDriver</value></property>

	    <property name="url"><value>jdbc:oracle:thin:@localhost:1521:orcl</value></property>

	    <property name="username"><value>root</value></property>

	    <property name="password"><value>root</value></property>

	</bean>

<!-- Spring 事务管理 -->

	<bean id="dbTransactionManager"  class="org.springframework.jdbc.datasource.DataSourceTransactionManager">   

    	<property name="dataSource" ref="dataSource"/>   

    </bean> 

    <!-- 配置Spring的事务代理 -->

    <bean id="accountservice" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"   >   

        <property name="transactionManager" ref="dbTransactionManager"/>   

        <property name="target" ref="testDaoImpl"/>   

        <property name="transactionAttributes">   

        <props>   

        	<prop key="insert*">PROPAGATION_REQUIRED,-Exception</prop>   

        	</props>   

        </property>   

   </bean>  

public void insertStudent(){

		try{

			String sql = "insert into student (snum, sname, sage, ssex) values('9','test1','39','男')";

			jdbcTemplate.update(sql);

			jdbcTemplate.update(sql);

		}catch(Exception exception){

			exception.printStackTrace();

		}

	}