springboot遇到的错误（一）

springboot错误

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘adminMenuController’: Unsatisfied dependency expressed through field ‘adminMenuService’; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘adminMenuService’: Unsatisfied dependency expressed through field ‘dao’; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type ‘com.java.ting.application.system.dao.AdminMenuDao’ available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:586)[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:372)[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1341)[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:572)[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495)[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:759)[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869)[spring-context-5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)[spring-context-5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140)[spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]atorg.springframework.boot.SpringApplication.refresh(SpringApplication.java:780)[spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]atorg.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:412)[spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]atorg.springframework.boot.SpringApplication.run(SpringApplication.java:333)[spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]atorg.springframework.boot.SpringApplication.run(SpringApplication.java:1277)[spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]atorg.springframework.boot.SpringApplication.run(SpringApplication.java:1265)[spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]atcom.java.ting.TingApplication.main(TingApplication.java:12)[classes/:na]atsun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethod)[na:1.8.0_{1}31]atsun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)[na:1.8.0_{1}31]atsun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[na:1.8.0_{1}31]atjava.lang.reflect.Method.invoke(Method.java:498)[na:1.8.0_{1}31]atorg.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)[spring-boot-devtools-2.0.5.RELEASE.jar:2.0.5.RELEASE]Causedby:org.springframework.beans.factory.UnsatisfiedDependencyException:Errorcreatingbeanwithnam{e}^{\prime }adminMenuServic{e}^{\prime }:Unsatisfieddependencyexpressedthroughfiel{d}^{\prime }da{o}^{\prime };nestedexceptionisorg.springframework.beans.factory.NoSuchBeanDefinitionException:Noqualifyingbeanoftyp{e}^{\prime }com.java.ting.application.system.dao.AdminMenuDa{o}^{\prime }available:expectedatleast1beanwhichqualifiesasautowirecandidate.Dependencyannotations:@org.springframework.beans.factory.annotation.Autowired(required=true)atorg.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:586) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:372) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1341) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:572) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:251)[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1135)[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1062)[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:583) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
… 24 common frames omitted
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type ‘com.java.ting.application.system.dao.AdminMenuDao’ available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1506) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1101) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1062) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:583) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]

== 遇到这种错误的解决办法 ==

1. 检查jar包
   查看pom.xml中引入的包名及版本等是否正确
2. 检查注解
   查看引入的注解是否正确
3. 检查mapper配置文件
   查看sql字段名，接收和返回的数据类型
4. 检查数据库
   表名或字段名是否为mysql的关键字（切记）
   多表关联时是否存在字段名和表名，字段名和字段名重复的问题