1、Spring中的applicationContext.xml配置錯誤導致的異常
異常信息：
org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.ssm.service.BTestService.getPhoneKey
at org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:223)
at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:48)
at org.apache.ibatis.binding.MapperProxy.cachedMapperMethod(MapperProxy.java:59)
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:52)
at com.sun.proxy.$Proxy17.getPhoneKey(Unknown Source)
如果是service接口調用出現此錯誤信息，注意這里不是myabtis接口mapper.java調用出現了此錯誤
導致異常的錯誤配置如下：
注意不要配置成 com.ssm.dao.* 這種配置方式掃描的是dao下的子包，最好配置為精准掃描包
為什么 說這里被mybatis重復掃描了呢？如圖所示這里的 service在debug下查看是org.apache.ibatis.binding.MapperProxy@******
如果配置掃描是這種com.ssm.dao.*，會報如下錯誤
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.ssm.dao.AppUserPhonekeyMapper com.ssm.service.BTestServiceImpl.appUserPhonekeyMapper; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.ssm.dao.AppUserPhonekeyMapper] 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$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:531)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:295)
2、以為是Spring中bean命名導致的錯誤
異常信息如下：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'beanTestController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.ssm.service.TBestService com.ssm.controller.BeanTestController.tBestService; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [com.ssm.service.TBestService] is defined: expected single matching bean but found 2: TBestServiceImpl,TBestService
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.ssm.service.TBestService com.ssm.controller.BeanTestController.tBestService; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [com.ssm.service.TBestService] is defined: expected single matching bean but found 2: TBestServiceImpl,TBestService
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:531)
Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [com.ssm.service.TBestService] is defined: expected single matching bean but found 2: TBestServiceImpl,TBestService
配置如下：
這里的spring核心配置文件中的mybatis掃描配置還是最大范圍的，包含了service接口，這里controller中配置如下
注意：上面的異常是不能找到注入的名稱，命名規則如下（myabtis應該是這樣的！，spring中@Autowired注入名稱正常是任意的命名），如果controller寫成了
private TBestService TBestService 這種寫法啟動不報錯，但是這時候的TBestService 在DEBUG模式下查看還是第一種里面的MapperProxy ，運行時還是會報第一種錯
3、Spring @Autowired注入名稱正常是任意的命名，測試如下：
spring自動對應找到了，service接口的實現類
有人可能懷疑是 注解的問題@Autowired 和@Resource不一樣，測試過，是一樣的！！具體這兩個注解的區別大家可以參考 :
https://www.cnblogs.com/smileLuckBoy/p/5801678.html
4、補充一下原來遇到的坑：Spring中的事務失效，事務不回滾原因
正常情況就是注解掃描的問題，
原來失效情況是這樣的：
spring中的applicationContext.xml中的掃描
<context:component-scan base-package="com.ssm.*">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />
</context:component-scan>
這里掃描了service接口以及實現，但是springmvc掃描又把service接口和實現掃描了一遍，導致了springmvc接管了service接口，正常的訪問和其他操作都沒問題，當需要事務回滾就不好用了。
總結： 在這里建議大家在spring xml文件配置中需要注意掃描的范圍.
1、spring負責掃描全局范圍的注解
2、mybatis注解掃描 dao的包
3、springmvc需要掃描 controller
千萬不要擴大范圍，很容易帶來一些費解的錯誤.