事务添加失败

我的事务这样有没有错，为什么就是失败，求大神
<!-- 有关aop事务的配置模板 -->
<bean id="myTransactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean> <tx:advice id="txAdvice"
transaction-manager="myTransactionManager">
<tx:attributes>
<tx:method name="save*" propagation="REQUIRED" />
<tx:method name="delete*" propagation="REQUIRED" />
<tx:method name="update*" propagation="REQUIRED" />
<tx:method name="get*" propagation="SUPPORTS" read-only="true" />
<tx:method name="find*" propagation="SUPPORTS" read-only="true" />
</tx:attributes>
</tx:advice> <aop:config>
<aop:pointcut id="bizMethods"
expression="execution(* com.jt.Dao.*.*(..))" />
<aop:advisor advice-ref="txAdvice" pointcut-ref="bizMethods" />
</aop:config>