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问题描述

今天我使用maven整合SSH时，创建了一个如下结构的聚合工程。

java.lang.IllegalStateException: Cannot convert value of type [com.sun.proxy.$Proxy51 implementing com.meimeixia.crm.service.ICustomerService,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised] to required type [com.meimeixia.crm.service.impl.CustomerService] for property 'customerService': no matching editors or conversion strategy found	org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:302)	org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:576)	org.springframework.beans.AbstractNestablePropertyAccessor.convertForProperty(AbstractNestablePropertyAccessor.java:603)	org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:204)	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1527)	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1486)	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1226)	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)	org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:325)	org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)	org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1048)	com.opensymphony.xwork2.spring.SpringObjectFactory.buildBean(SpringObjectFactory.java:161)	com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:178)	com.opensymphony.xwork2.factory.DefaultActionFactory.buildAction(DefaultActionFactory.java:22)	com.opensymphony.xwork2.ObjectFactory.buildAction(ObjectFactory.java:148)	com.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:295)	com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:395)	com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:194)	org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)	org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:37)	com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)	org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:554)	org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:81)	org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)

出错原因

根据上面详细的错误提示信息可知，报错的根本原因就是Spring在转换时，主要是将代理类转换成接口，而不能转换成实际类。

解决办法

在使用Spring进行aop开发的时候，需要设置proxy-target-class这个属性的值，以决定是基于接口还是类被代理，若proxy-target-class属性的值为true，则表示是基于类被代理。

所以，要想解决这个问题，我们需要在crm-service子模块的applicationContext-service.xml配置文件中配置aop时，注明可以基于类被代理，即在<aop:cnfig>标签上添加proxy-target-class="true"。

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