一個報錯引起的懸案

問題： 再一次tomcat啓動的過程當中，發現一個service調用另外一個service報錯入下：

org.springframework.beans.factory.BeanCreationException: Could not autowire field: public com.framework.demo.service.message.MessageService com.framework.demo.service.message.MessageApiServiceImpl.messageService; nested exception is java.lang.IllegalArgumentException: Can not set com.framework.demo.service.message.MessageService field com.framework.demo.service.message.MessageApiServiceImpl.messageService to com.sun.proxy.$Proxy81
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:508)
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:700)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
	at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:381)
	at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:293)
	at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
	at org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:771)
	at org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:424)
	at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:763)
	at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:249)
	at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250)
	at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:706)
	at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:492)
	at org.mortbay.jetty.plugin.JettyWebAppContext.doStart(JettyWebAppContext.java:293)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
	at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:229)
	at org.eclipse.jetty.server.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:172)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
	at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:229)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
	at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:95)

大概的意思是說，@Autowired標註的類沒法正確的注入。我這裏是把service實現直接用@Autowrired直接注入進來。這裏面的錯誤是由於service已經被事務類所代理，因爲Autowired是按照類型匹配的。直接將代理類放入進來是沒法找到原始類型的，只知道該類是代理類，因此用@Autowired標註出錯。

org.springframework.aop.framework.ProxyFactory: 1 interfaces [cn.vansky.framework.core.service.GenericService]; 1 advisors [org.springframework.aop.support.DefaultPointcutAdvisor: pointcut [Pointcut.TRUE]; advice [org.springframework.transaction.interceptor.TransactionInterceptor@4890d0]]; targetSource [SingletonTargetSource for target object [com.framework.demo.service.message.MessageService@4dfa9a2c]]; proxyTargetClass=false; optimize=false; opaque=false; exposeProxy=false; frozen=false

解決辦法天然是要繞開代理類，將Service接口放置到這裏面來。