about issues that springboot beans cannot inject (related to package location) Change the automatically scanned package

cause : When the bean is added to the project, @component cannot be scanned by spring (the idea will not be able to get the corresponding bean at compile time).
Later, the research was related to the location of the document package.

Springboot Bean Assembly Rules:
Scan from top to bottom according to the package location where the application class is located!
Scan the package of the application class and its child packages

Note: You can specify a scanned package by adding @componentscan (basepackages={"xxx.xxx", "xxx.xxx"}) to the application class, but the package will not be scanned under the default scan application class once specified

about issues that springboot beans cannot inject (related to package location) Change the automatically scanned package