Unable to use the bean introduced into the jar package

problem ：

stay A Project use @[email protected]、@Component、@Service、@Controller、@Mapper、@Repository And other annotation injected classes , Pack it up jar After the introduction of B The project cannot be used @Autowired Automatic injection

Analytical problem ：

because SpringBoot The default path for automatic scanning is the package where the main startup class is located and its child packages , If jar In bag bean The path to is not included , Will not be scanned , So it can't be used @Autowired Automatic injection

resolvent ：

resolvent 1：
@SpringBootApplication Set parameters ：scanBasePackages={“com."}

resolvent 2： Add... On the main boot ：@ComponentScan("com.”)