spring mybatis NoSuchBeanDefinitionException 解决方案

今天在测试环境中加了一个dao，运行报错如下：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'spiderServiceImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.yangwp.spider.dao.SpiderDao com.yangwp.spider.service.impl.SpiderServiceImpl.spiderDao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.yangwp.spider.dao.SpiderDao] found for dependency: expected at least 1 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:334)    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1210)    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755)    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5110)    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5633)    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1009)    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:985)    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)    at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1899)    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)    at java.lang.reflect.Method.invoke(Method.java:606)    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:618)    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:565)    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)    at java.lang.reflect.Method.invoke(Method.java:606)    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)    at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1487)    at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:97)    at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1328)    at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1420)    at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:848)    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)    at java.lang.reflect.Method.invoke(Method.java:606)    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322)    at sun.rmi.transport.Transport$2.run(Transport.java:202)    at sun.rmi.transport.Transport$2.run(Transport.java:199)    at java.security.AccessController.doPrivileged(Native Method)    at sun.rmi.transport.Transport.serviceCall(Transport.java:198)    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:567)    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828)    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.access$400(TCPTransport.java:619)    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$1.run(TCPTransport.java:684)    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$1.run(TCPTransport.java:681)    at java.security.AccessController.doPrivileged(Native Method)    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:681)    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)    at java.lang.Thread.run(Thread.java:745)Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.yangwp.spider.dao.SpiderDao com.yangwp.spider.service.impl.SpiderServiceImpl.spiderDao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.yangwp.spider.dao.SpiderDao] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:561)    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)    ... 60 moreCaused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.yangwp.spider.dao.SpiderDao] found for dependency: expected at least 1 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:1301)    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1047)    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:942)    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:533)    ... 62 more

错误原因是mybatis配置错误，可以看到错误信息：

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException:，没有找到bean的定义，于是打开mybatis配置文件看到下面一个配置：

    <!-- DAO接口所在包名，Spring会自动查找其下的类 -->    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">        <property name="basePackage" value="com.yangwp.test.dao"/>        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>    </bean>    ```    我配置mybatis时只配置了查找com.yangwp.test.dao下的dao，而我新加入的dao文件不在test包下，所以就报错了，将以上配置改为

<!-- DAO接口所在包名，Spring会自动查找其下的类 --><bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">    <property name="basePackage" value="com.yangwp.**.dao"/>    <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property></bean> 

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如此，问题便解决了