【Caused by: java.lang.IllegalArgumentException: Original must not be null 】
下面是我开发项目中遇到的问题，Caused by: java.lang.IllegalArgumentException: Original must not be null,提示这个错误，百思不得其解。最后面不断的google,spring配置Aop配置相关的文章，最后硬着头皮去看看错误，想调试一番，因为spring的代理无非就是两种，一种是jdk代理；另外一种就是cglib代理。
在这个项目中我用了spring的cglib代理，但是项目是SSH（spring+struts2+ibatis），struts2 默认注入的方式是jdk模式，问题是否是出在这个地方呢？
错误：Failed to convert property value of type [com.taobao.www.fanjf.servicei.TaobaokeItemsService$$EnhancerByCGLIB$$20783c4d] to required type
TaobaokeItemsService（实现类）注入到一个spring受管Bean中， 但是spring容器提示你注入的Bean类型不对，它说你注入的是 [$Proxy13] 类型，这就说明你可能在无意中将authorDaoImp实现了代理， 此时你再在spring容器中引用 TaobaokeItemsService（实现类）时得到的将是代理类型。
这个似乎提示了我，在struts2当中，我必须通过接口注入方式。
在com.taobao.www.fanjf.action.DisplayPayedAction这个action当中我必须通过接口注入，最后面确定了，lazy-init="false" 也必须使用
[html]
taobaokeItemsManager
下面是配置：
[html]
<!-- 声明一个服务 -->
<bean id="taobaokeItemsServiceTarget" class="com.taobao.www.fanjf.servicei.TaobaokeItemsService" lazy-init="false" autowire="byType"/>
<!-- 相关的服务 -->
<bean id = "taobaokeItemsManager" class="org.springframework.aop.framework.ProxyFactoryBean" >
<!--这里代理的是接口-->
<property name="proxyInterfaces" value="com.taobao.www.fanjf.servicei.ITaobaokeItemsService">
</property>
<!--是ProxyFactoryBean要代理的目标类-->
<property name="target">
<ref bean="taobaokeItemsServiceTarget"/>
</property>
<property name="interceptorNames">
<list>
<value>methodCachePointCut</value>
</list>
</property>
<property name="proxyTargetClass" value="true"/>
</bean>
<bean id="DisplayPayedAction" class="com.taobao.www.fanjf.action.DisplayPayedAction">
<property name="taobaokeItemsManager" ref="taobaokeItemsManager" />
</bean>
[java]
[DEBUG] 2012-12-20 13:28:40 :Unable to apply any optimisations to advised method: protected native java.lang.Object java.lang.Object.clone（） throws java.lang.CloneNotSupportedException
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract int org.springframework.aop.framework.Advised.indexOf（org.aopalliance.aop.Advice）
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract int org.springframework.aop.framework.Advised.indexOf（org.springframework.aop.Advisor）
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract boolean org.springframework.aop.framework.Advised.isFrozen（）
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract org.springframework.aop.TargetSource org.springframework.aop.framework.Advised.getTargetSource（）
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract void org.springframework.aop.framework.Advised.addAdvisor（org.springframework.aop.Advisor） throws org.springframework.aop.framework.AopConfigException
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract void org.springframework.aop.framework.Advised.addAdvisor（int,org.springframework.aop.Advisor） throws org.springframework.aop.framework.AopConfigException
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract void org.springframework.aop.framework.Advised.setTargetSource（org.springframework.aop.TargetSource）
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract void org.springframework.aop.framework.Advised.setPreFiltered（boolean）
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract boolean org.springframework.aop.framework.Advised.isProxyTargetClass（）
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract void org.springframework.aop.framework.Advised.setExposeProxy（boolean）
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract boolean org.springframework.aop.framework.Advised.isExposeProxy（）
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract java.lang.Class[] org.springframework.aop.framework.Advised.getProxiedInterfaces（）
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract org.springframework.aop.Advisor[] org.springframework.aop.framework.Advised.getAdvisors（）
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract boolean org.springframework.aop.framework.Advised.isPreFiltered（）
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract boolean org.springframework.aop.framework.Advised.isInterfaceProxied（java.lang.Class）
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract void org.springframework.aop.framework.Advised.removeAdvisor（int） throws org.springframework.aop.framework.AopConfigException
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract boolean org.springframework.aop.framework.Advised.removeAdvisor（org.springframework.aop.Advisor）
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract boolean org.springframework.aop.framework.Advised.replaceAdvisor（org.springframework.aop.Advisor,org.springframework.aop.Advisor） throws org.springframework.aop.framework.AopConfigException
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract void org.springframework.aop.framework.Advised.addAdvice（int,org.aopalliance.aop.Advice） throws org.springframework.aop.framework.AopConfigException
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract void org.springframework.aop.framework.Advised.addAdvice（org.aopalliance.aop.Advice） throws org.springframework.aop.framework.AopConfigException
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract boolean org.springframework.aop.framework.Advised.removeAdvice（org.aopalliance.aop.Advice）
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract java.lang.String org.springframework.aop.framework.Advised.toProxyConfigString（）
[DEBUG] 2012-12-20 13:28:40 :Method is declared on Advised interface: public abstract java.lang.Class org.springframework.aop.TargetClassAware.getTargetClass（）
[DEBUG] 2012-12-20 13:28:40 :Finished creating instance of bean 'fanjfReportMemeberDAO'
[DEBUG] 2012-12-20 13:28:40 :Creating shared instance of singleton bean 'userInviteDAO'
[DEBUG] 2012-12-20 13:28:40 :Creating instance of bean 'userInviteDAO'
[DEBUG] 2012-12-20 13:28:40 :Returning cached instance of singleton bean 'methodCachePointCut'
[DEBUG] 2012-12-20 13:28:40 :Returning cached instance of singleton bean 'org.springframework.aop.support.DefaultBeanFactoryPointcutAdvisor#0'
[DEBUG] 2012-12-20 13:28:40 :Eagerly caching bean 'userInviteDAO' to allow for resolving potential circular references
[DEBUG] 2012-12-20 13:28:40 :Getting BeanInfo for class [com.taobao.www.fanjf.daoi.UserInviteDAO]
[DEBUG] 2012-12-20 13:28:40 :Caching PropertyDescriptors for class [com.taobao.www.fanjf.daoi.UserInviteDAO]
[DEBUG] 2012-12-20 13:28:40 :Found bean property 'class' of type [java.lang.Class]
[DEBUG] 2012-12-20 13:28:40 :Found bean property 'dataSource' of type [javax.sql.DataSource]
[DEBUG] 2012-12-20 13:28:40 :Found bean property 'sqlMapClient' of type [com.ibatis.sqlmap.client.SqlMapClient]
[DEBUG] 2012-12-20 13:28:40 :Found bean property 'sqlMapClientTemplate' of type [org.springframework.orm.ibatis.SqlMapClientTemplate]
[DEBUG] 2012-12-20 13:28:40 :Returning cached instance of singleton bean 'sqlMapClient'
[DEBUG] 2012-12-20 13:28:40 :Invoking afterPropertiesSet（） on bean with name 'userInviteDAO'
[DEBUG] 2012-12-20 13:28:40 :Returning cached instance of singleton bean 'methodCachePointCut'
[DEBUG] 2012-12-20 13:28:40 :Returning cached instance of singleton bean 'org.springframework.aop.support.DefaultBeanFactoryPointcutAdvisor#0'
[DEBUG] 2012-12-20 13:28:40 :Returning cached instance of singleton bean 'methodCachePointCut'
[DEBUG] 2012-12-20 13:28:40 :Returning cached instance of singleton bean 'org.springframework.aop.support.DefaultBeanFactoryPointcutAdvisor#0'
[DEBUG] 2012-12-20 13:28:40 :Creating [java.util.concurrent.ConcurrentHashMap]
[DEBUG] 2012-12-20 13:28:40 :Creating implicit proxy for bean 'userInviteDAO' with 0 common interceptors and 2 specific interceptors
[DEBUG] 2012-12-20 13:28:40 :Creating CGLIB2 proxy: target source is SingletonTargetSource for target object [com.taobao.www.fanjf.daoi.UserInviteDAO@17e9b52]
[WARN ] 2012-12-20 13:28:40 :Unable to proxy method [public final void org.springframework.orm.ibatis.support.SqlMapClientDaoSupport.setDataSource（javax.sql.DataSource）] because it is final: All calls to this method via a proxy will be routed directly to the proxy.
[WARN ] 2012-12-20 13:28:40 :Unable to proxy method [public final org.springframework.orm.ibatis.SqlMapClientTemplate org.springframework.orm.ibatis.support.SqlMapClientDaoSupport.getSqlMapClientTemplate（）] because it is final: All calls to this method via a proxy will be routed directly to the proxy.
[WARN ] 2012-12-20 13:28:40 :Unable to proxy method [public final javax.sql.DataSource org.springframework.orm.ibatis.support.SqlMapClientDaoSupport.getDataSource（）] because it is final: All calls to this method via a proxy will be routed directly to the proxy.
[WARN ] 2012-12-20 13:28:40 :Unable to proxy method [public final void org.springframework.orm.ibatis.support.SqlMapClientDaoSupport.setSqlMapClient（com.ibatis.sqlmap.client.SqlMapClient）] because it is final: All calls to this method via a proxy will be routed directly to the proxy.
[WARN ] 2012-12-20 13:28:40 :Unable to proxy method [public final com.ibatis.sqlmap.client.SqlMapClient org.springframework.orm.ibatis.support.SqlMapClientDaoSupport.getSqlMapClient（）] because it is final: All calls to this method via a proxy will be routed directly to the proxy.
[WARN ] 2012-12-20 13:28:40 :Unable to proxy method [public final void org.springframework.orm.ibatis.support.SqlMapClientDaoSupport.setSqlMapClientTemplate（org.springframework.orm.ibatis.SqlMapClientTemplate）] because it is final: All calls to this method via a proxy will be routed directly to the proxy.
[WARN ] 2012-12-20 13:28:40 :Unable to proxy method [public final void org.springframework.dao.support.DaoSupport.afterPropertiesSet（） throws java.lang.IllegalArgumentException,org.springframework.beans.factory.BeanInitializationException] because it is final: All calls to this method via a proxy will be routed directly to the proxy.
[DEBUG] 2012-12-20 13:28:40 :Creating [java.util.concurrent.ConcurrentHashMap]
[DEBUG] 2012-12-20 13:28:40 :Unable to apply any optimisations to advised method: public java.util.List com.taobao.www.fanjf.daoi.UserInviteDAO.query（java.lang.Long,java.lang.Long,java.lang.String,java.lang.String,java.util.Date,java.util.Date） throws java.lang.RuntimeException
[DEBUG] 2012-12-20 13:28:40 :Unable to apply any optimisations to advised method: public com.taobao.www.fanjf.pojo.UserInvite com.taobao.www.fanjf.daoi.UserInviteDAO.findUserInviteById（int） throws java.lang.RuntimeException
[DEBUG] 2012-12-20 13:28:40 :Unable to apply any optimisations to advised method: public void com.taobao.www.fanjf.daoi.UserInviteDAO.saveUserInvite（com.taobao.www.fanjf.pojo.UserInvite） throws java.lang.RuntimeException
[DEBUG] 2012-12-20 13:28:40 :Unable to apply any optimisations to advised method: public void com.taobao.www.fanjf.daoi.UserInviteDAO.deleteUserInvite（int） throws java.lang.RuntimeException
[DEBUG] 2012-12-20 13:28:40 :Unable to apply any optimisations to advised method: public void com.taobao.www.fanjf.daoi.UserInviteDAO.updateUserInvite（com.taobao.www.fanjf.pojo.UserInvite） throws java.lang.RuntimeException
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