spring整合mybatis，在dao层我们只写一个接口，配置相应的*mapper.xml文件，
报如下错误：
1 org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'helloController': Unsatisfied dependency expressed through field 'helloService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'helloService': Unsatisfied dependency expressed through field 'helloMapper'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.aopeng.quest.dao.IHelloMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} 2 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588) 3 at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) 4 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366) 5 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264) 6 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) 7 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) 8 at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) 9 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 10 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) 11 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) 12 at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) 13 at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) 14 at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) 15 at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:443) 16 at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:325) 17 at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107) 18 at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4727) 19 at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5189) 20 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 21 at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:724) 22 at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:700) 23 at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734) 24 at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1702) 25 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 26 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 27 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 28 at java.lang.reflect.Method.invoke(Method.java:498) 29 at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300) 30 at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) 31 at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) 32 at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:482) 33 at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:431) 34 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 35 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 36 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 37 at java.lang.reflect.Method.invoke(Method.java:498) 38 at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300) 39 at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) 40 at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) 41 at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468) 42 at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76) 43 at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309) 44 at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401) 45 at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829) 46 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 47 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 48 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 49 at java.lang.reflect.Method.invoke(Method.java:498) 50 at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:324) 51 at sun.rmi.transport.Transport$1.run(Transport.java:200) 52 at sun.rmi.transport.Transport$1.run(Transport.java:197) 53 at java.security.AccessController.doPrivileged(Native Method) 54 at sun.rmi.transport.Transport.serviceCall(Transport.java:196) 55 at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568) 56 at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826) 57 at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683) 58 at java.security.AccessController.doPrivileged(Native Method) 59 at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682) 60 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 61 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 62 at java.lang.Thread.run(Thread.java:745) 63 Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'helloService': Unsatisfied dependency expressed through field 'helloMapper'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.aopeng.quest.dao.IHelloMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} 64 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588) 65 at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) 66 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366) 67 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264) 68 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) 69 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) 70 at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) 71 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 72 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) 73 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) 74 at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) 75 at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) 76 at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) 77 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585) 78 ... 60 more 79 Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.aopeng.quest.dao.IHelloMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} 80 at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1493) 81 at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1104) 82 at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) 83 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585) 84 ... 73 more
起始这是由于一个低级错误引起的，在applicationContext.xml中有如下的配置：
1 <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> 2 <property name="basePackage" value="com.xxx.xxx.dao.**.*" /> 3 <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /> 4 </bean>
basePackage的value应该是指定包名，而我指定的文件名。
改成如下配置，编译正常通过：
1 <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> 2 <property name="basePackage" value="com.xxx.xxx.dao" /> 3 <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /> 4 </bean>