Spring如何从ProxyFactoryBean获取带有原型范围的bean

时间:2012-11-17 21:07:33

标签: java spring

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。我不成功。我不知道出了什么问题。

以下是上下文:

<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>

在我执行以下操作时的代码中:

...................

...................

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

在checkTask bean上尝试调用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。问题是,在这种情况下,我总是获得ruleCheckTask的单例。我总是需要新的实例。 RuleCheckTask实现Runnable接口的一件小事。

有人可以给我一个提示吗?

谢谢

1 个答案:

答案 0 :(得分:1)

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(无target)设置为ruleCheckTaskPrototype。不同之处在于,在第一个上,您有一个独立的代理配置实例,在第二个上,PrototypeTargetSource在每个请求上获得一个新实例。