spring 事务异常Failed to convert property value of type [$Proxy12] to required type

spring 事务异常Failed to convert property value of type [$Proxy12] to required type

 

<?xml version="1.0" encoding="GB2312"?>     
<beans xmlns="http://www.springframework.org/schema/beans "    
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance "    
       xmlns:aop="http://www.springframework.org/schema/aop "    
       xmlns:tx="http://www.springframework.org/schema/tx "    
       xsi:schemaLocation="     
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd      
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd      
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd ">

<bean id="dataSource"
class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName"
   value="com.mysql.jdbc.Driver">
</property>
<!-- 现场字符集：?useUnicode=true&amp;characterEncoding=gb2312
   数据库如果是: utf-8 不需要转换
-->
<property name="url"
   value="jdbc:mysql://localhost:3306/jssms?useUnicode=true&amp;characterEncoding=gb2312">
</property>
<property name="username" value="root"></property>
<property name="password" value="zmq"></property>
</bean>

   

<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource">
         <ref bean="dataSource"/>
        </property>
    </bean>
      
    <bean id="txManager"    
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">     
        <property name="dataSource" ref="dataSource"/>
    </bean>     
         
    <tx:advice id="txAdvice" transaction-manager="txManager">     
        <tx:attributes>     
            <tx:method name="query*" propagation="REQUIRED" read-only="true" rollback-for="DataAccessException"/>     
            <tx:method name="*" propagation="REQUIRED" rollback-for="DataAccessException"/>     
        </tx:attributes>     
    </tx:advice>     
         
    <aop:config>     
        <aop:pointcut id="daoPointCut" expression="execution(* com.chemmade.adminbg.dao.impl..*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="daoPointCut"/>     
    </aop:config>     
</beans>

。。。。

<bean scope="prototype" id="adminDAO" class="com.chemmade.adminbg.dao.impl.AdminDAOImpl">
        <property name="jdbcTemplate">
   <ref bean="jdbcTemplate" />
</property>
</bean>

<bean scope="prototype" id="AdminLoginAction" class="com.chemmade.adminbg.action.AdminLoginAction">
<property name="adminDAO">
   <ref local="adminDAO" />
</property>
</bean>

加入spring事务报如下异常：

严重: Servlet.service() for servlet default threw exception
org.springframework.beans.PropertyBatchUpdateException; nested PropertyAccessException details (1) are:
PropertyAccessException 1:
org.springframework.beans.TypeMismatchException: Failed to convert property value of type [$Proxy12] to required type [com.chemmade.adminbg.dao.impl.AdminDAOImpl] for property 'adminDAO'; nested exception is java.lang.IllegalArgumentException: Cannot convert value of type [$Proxy12] to required type [com.chemmade.adminbg.dao.impl.AdminDAOImpl] for property 'adminDAO': no matching editors or conversion strategy found
Caused by: java.lang.IllegalArgumentException: Cannot convert value of type [$Proxy12] to required type [com.chemmade.adminbg.dao.impl.AdminDAOImpl] for property 'adminDAO': no matching editors or conversion strategy found
at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:231)
at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:138)
at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:815)
at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:648)
......

错误原因：

配置事务为adminDAOImpl生成了代理，所以在下面action中注入的将是代理对象（提示信息中的 [$Proxy12] ）而不是原来的adminDAOImpl对象，这就产生了上面错误信息。

解决办法：

使用cgilib来实现AOP，定义proxy-target-class="true" ;proxy-target-class属性值决定是基于接口的还是基于类的代理被创建。如果proxy-target-class 属性值被设置为true，那么基于类的代理被创建,产生的代理对象会instanceof原来的类。

<aop:config proxy-target-class="true">     
        <aop:pointcut id="daoPointCut" expression="execution(* com.chemmade.adminbg.dao.impl..*.*(..))" />
        <aop:advisor advice-ref="txAdvice" pointcut-ref="daoPointCut"/>     
    </aop:config>

 

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