why @Autowired work without @Component when inside @Configuration-CodePudding

I am configuring the shiro-spring-starter.

@Configuration
public class ShiroConfig {
    @Bean
    public Realm realm() {
        return new UserRealm();
    }
}

\\Without @Component
public class UserRealm extends AuthorizingRealm {
    
    @Autowired
    private UserMapper userMapper;
}

UserRealm was create using "new UserRealm()",without @Component. why the @Autowired work?

CodePudding user response：

In your code, the @Component annotation is not required because you've created the UserRealm object as a spring bean in the ShiroConfig class. Since it's a spring bean, spring will manage the object and perform the dependency injections specified by the @Autowired annotation.

If you didn't create the UserRealm object as a spring bean in the ShiroConfig class, you would then need the @Component annotation on the UserRealm class. The @Component annotation would cause spring to automatically create an instance of the UserRealm class as a spring bean, assuming component scanning is enabled.

So you either don't use a @Component annotation and manually create spring beans in your configuration class, or use the @Component annotation and let spring automatically create the spring bean. The result is the same.