項目場景：

提示：springboot + mybatis plus

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問題描述：

重點報錯信息：

Specified class is an interface

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'bankAllocationDao' defined in file [/...

Unsatisfied dependency expressed through field 'bankDao'

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2021-05-28 00:01:26.426 [main] ERROR org.springframework.boot.SpringApplication:837 - Application run failed org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'bankController': Unsatisfied dependency expressed through field 'bankService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'bankServiceImpl': Unsatisfied dependency expressed through field 'bankDao'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'bankDao' defined in file [/.../target/classes/org/.../product/bank/dao/BankDao.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [....dao.BankDao]: Specified class is an interfaceat org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:643)at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130)at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399)Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'bankServiceImpl': Unsatisfied dependency expressed through field 'bankDao'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'bankDao' defined in file [/.../BankDao.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [...dao.BankDao]: Specified class is an interface... 20 common frames omitted

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原因分析：

大致原因：dao接口無法創建bean，導致service層依賴無法注入，導致controller層依賴無法注入

歸根結底：又一個bean創建失敗

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匯總了許多網上的辦法：

controller層service層dao層注解是否都使用正確？

接口有沒有寫實現類，實現類實現的接口是否正確?

xml映射文件里路徑大小寫類型是否正確？

有重復命名的xxxMapper.xml文件嗎？

接口名字是否重復？

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解決方案：

最終解決是第五條：接口名字是否重復，但是！重點是：非Spring提供的報錯信息中的這個接口與其他重復，而是與報錯信息毫無相關的兩個接口名字有重復。

如果，前四條檢查后沒有解決問題，重命名報錯中接口名字后仍無見效，請每一個接口的檢查，就是這么吐血。

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