旷世奇坑！！！spring 不能自动注入

一入此坑，只想跳楼。我发誓应该不会有第二个人会进这种坑！

问题描述：

　　总是不能注入dao层，即@Resposity。always！always！always！（尝试了天下之因特网所有的注入方式，都不能尽我之意！）

原错误代码：

-- ::14.559 ERROR [RMI TCP Connection()-127.0.0.1] ContextLoader.initWebApplicationContext() | Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'gameChatService': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.longyuan.dao.GameChatDao com.longyuan.service.GameChatServiceImpl.gameChatDao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.longyuan.dao.GameChatDao] found for dependency: expected at least  bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:)
    at org.springframework.beans.factory.support.AbstractBeanFactory$.getObject(AbstractBeanFactory.java:)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:)
    at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:)
    at java.lang.reflect.Method.invoke(Method.java:)
    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:)
    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:)
    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:)
    at java.lang.reflect.Method.invoke(Method.java:)
-May- ::14.562 SEVERE [RMI TCP Connection()-127.0.0.1] org.apache.catalina.core.StandardContext.startInternal One or more listeners failed to start. Full details will be found in the appropriate container log file
-May- ::14.564 SEVERE [RMI TCP Connection()-127.0.0.1] org.apache.catalina.core.StandardContext.startInternal Context [] startup failed due to previous errors
    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:)
    at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:)
    at javax.management.remote.rmi.RMIConnectionImpl.access$(RMIConnectionImpl.java:)
    at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:)
    at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:)
    at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:)
    at java.lang.reflect.Method.invoke(Method.java:)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:)
    at sun.rmi.transport.Transport$.run(Transport.java:)
    at sun.rmi.transport.Transport$.run(Transport.java:)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$(TCPTransport.java:)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:)
    at java.lang.Thread.run(Thread.java:)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.longyuan.dao.GameChatDao com.longyuan.service.GameChatServiceImpl.gameChatDao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.longyuan.dao.GameChatDao] found for dependency: expected at least  bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:)
    ...  more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.longyuan.dao.GameChatDao] found for dependency: expected at least  bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:)
    ...  more
[-- ::,] Artifact gameml:war exploded: Error during artifact deployment. See server log for details.
-May- ::21.604 INFO [localhost-startStop-] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory D:\Program Files\tomcat\webapps\manager
-May- ::21.675 INFO [localhost-startStop-] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory D:\Program Files\tomcat\webapps\manager has finished in  ms

原因：

　　先写吐槽心得：下次遇到这种坑爹奇葩问题，直接删除工程重写！

正文：

　　

　　就是这玩意儿！！！ Excludes--我只想f**k你！100遍！！！

　　好的，回到正常人。在一不小心点的时候把这个类弄成compiler exludes，然后就没有然后了。

再补一个异常再现：

　　

可以看到target中并没有GameChatDaoImpl.class!

解决办法：

　　在编译器中找到setting--》Compiler--》Excludes：去掉该类即ok！

以此铭记！再见。

　　　　记于2016.05.19.17：14：25