我坚持这个问题。

二手组件:Spring 1.2.8,Hibernate 3.2.0 cr1,tomcat,struts,java 6

我正在尝试使用scope = prototype从ProxyFactoryBean获取bean。我没有成功。我不知道怎么了。

这里是上下文:

<beans>

    <bean id="ruleCheckTask" class="rulechecker.RuleCheckTask" singleton="false">

    <bean id="ruleCheckTaskPrototype" class="org.springframework.aop.target.PrototypeTargetSource">
       <property name="targetBeanName" value="ruleCheckTask" />
    </bean>

    <bean id="transactionInterceptorRuleCheckTask" class="org.springframework.transaction.interceptor .TransactionInterceptor">
       <property name="transactionManager">
           <ref bean="transactionManager" />
       </property>
       <property name="transactionAttributeSource">
          <value>
              rulechecker.IRuleCheckTask.run=PROPAGATION_REQUIRE S_NEW
          </value>
       </property>
   </bean>

  <bean id="ruleCheckTaskService" class="org.springframework.aop.framework.ProxyFact oryBean">
         <property name="target" ref="ruleCheckTaskPrototype" />
         <property name="proxyInterfaces">
             <value>
                  rulechecker.IRuleCheckTask
             </value>
        </property>
        <property name="interceptorNames">
              <list>
                   <value>transactionInterceptorRuleCheckTask</value>
              </list>
        </property>
   </bean>
</beans>


在代码中,当我执行以下操作时:

..........

..........

IRuleCheckTask checkTask =(IRuleCheckTask)applicationContext.getBean(“ ruleCheckTaskService”);
checkTask.setTestCase(oneTestCase);

尝试在checkTask bean上调用setTestCase时出现以下异常:

java.lang.IllegalArgumentException: object is not an instance of declaring class
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknow n Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Un known Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.aop.support.AopUtils.invokeJoi npointUsingReflection(AopUtils.java:287)
at org.springframework.aop.framework.ReflectiveMethod  Invocation.invokeJoinpoint(ReflectiveMethodInvocat ion.java:181)
at org.springframework.aop.framework.ReflectiveMethod    Invocation.proceed(ReflectiveMethodInvocation.java :148)
at org.springframework.transaction.interceptor.Transa ctionInterceptor.invoke(TransactionInterceptor.jav a:96)
at org.springframework.aop.framework.ReflectiveMethod Invocation.proceed(ReflectiveMethodInvocation.java :170)
at org.springframework.aop.framework.JdkDynamicAopPro xy.invoke(JdkDynamicAopProxy.java:176)
at $Proxy21.setTestCase(Unknown Source)


如果在ProxyFactoryBean中我使用ruleCheckTask而不是ruleCheckTaskPrototype,则可以正常工作。问题在于,在这种情况下,我总是获得单例的RuleCheckTask。而且我总是需要新实例。
RuleCheckTask的一件小事实现了Runnable接口。

有人可以给我一个提示吗?

谢谢

最佳答案

尝试:

<bean id="ruleCheckTaskService" class="org.springframework.aop.framework.ProxyFact oryBean">
         <property name="targetName" value="ruleCheckTask" />
         <property name="singleton" value="false" />  <!-- this do the trick -->
         <property name="proxyInterfaces">
             <value>
                  rulechecker.IRuleCheckTask
             </value>
        </property>
        <property name="interceptorNames">
              <list>
                   <value>transactionInterceptorRuleCheckTask</value>
              </list>
        </property>
   </bean>


您也可以将targetSource(没有target)设置为ruleCheckTaskPrototype。不同之处在于,在第一个实例上,您具有代理配置的独立实例,在第二个实例上,PrototypeTargetSource在每个请求上获取一个新实例。

09-28 08:38