package structure is as follows: 
 com.xxx.xxx.package1 
 com.xxx.xxx.package2 
 com.xxx.xxx.package3 
 com.xxx.xxx.common.package1 
. 
 each package has an independent controller,service,repository, etc. 
tested in Spring Boot and JUnit5 environments, @ ComponentScan (value= {"com.xxx.xxx.package1", "com.xxx.xxx.common.package1"}) finally shows that bean cannot be injected
