Spring AOP报错处理 Can not set field to $Proxy 在spring中使用事物或AOP遇到的错误

<tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true"/>

<aop:config proxy-target-class="true">

<tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true"/>
    <!-- 配置事务管理器 -->
    <bean
        id="transactionManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager" >
        <property name="sessionFactory" >
            <ref local="sessionFactory" />
        </property>
    </bean>
    <!-- 配置哪些方法需要哪些事务 -->
    <tx:advice
        id="txadvice"
        transaction-manager="transactionManager" >
        <tx:attributes>
            <tx:method
                name="create*"
                propagation="REQUIRED" />
            <tx:method
                name="delete*"
                propagation="REQUIRED" />
            <tx:method
                name="update*"
                propagation="REQUIRED" />
            <tx:method name="read*"
                read-only="true"
                propagation="NOT_SUPPORTED"/>
            <tx:method
                name="*"
                read-only="true" />
        </tx:attributes>
    </tx:advice>
    <!-- pointcut切入点；advice，通知，即被织入的方法 。这儿是AOP-->
    <aop:config proxy-target-class="true">
        <aop:pointcut
            id="managerMethods"
            expression="execution (* org.ccnt.med.dao.TbTopicDao.*(..))" />
        <aop:pointcut
            id="managerMethods"
            expression="execution (* org.ccnt.med.dao.TbDisTopicDao.*(..))" />
        <aop:advisor
            advice-ref="txadvice"
            pointcut-ref="managerMethods" />
    </aop:config>