어노테이션 상속

• AutoAppConfig를 만들어서 스프링 컨테이너에 빈을 등록하기 위해서는 탐색 범위를 지정해주는 @ComponentScan이 필수적

• ComponentScan 어노테이션을 @SpringBootApplication도 갖고 있기 때문에 스프링 부트를 쓰면 스프링 빈을 등록할 수 있다고 함

궁금점

• @SpringBootApplication이 탐색 범위에 대한 어노케이션도 갖고 있다면 @ComponentScan 대신 @SpringBootApplication을 사용할 수 있지 않을까?

package hello.core;

import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;

@Configuration
//@ComponentScan(
//        excludeFilters = @ComponentScan.Filter(type = FilterType.ANNOTATION, classes = Configuration.class)
//)
@SpringBootApplication
public class AutoAppConfig {

}

테스트

• org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'hello.core.member.MemberService' available: expected single matching bean but found 2: memberServiceImpl,memberService 에러 발생
• 

ComponentScan Annotation을 상속해서 사용한 것이 불가능한가?

• TestAnnotation을 만들어 테스트 진행

• // TestAnnotation 생성
  package hello.core.annotation;
  
  import org.springframework.beans.factory.annotation.Qualifier;
  import org.springframework.context.annotation.ComponentScan;
  import org.springframework.context.annotation.Configuration;
  import org.springframework.context.annotation.FilterType;
  
  import java.lang.annotation.*;
  
  @Target({ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER, ElementType.TYPE, ElementType.ANNOTATION_TYPE})
  @Retention(RetentionPolicy.RUNTIME)
  @Inherited
  @Documented
  @Qualifier("TestAnnotation")
  @ComponentScan(
          excludeFilters = @ComponentScan.Filter(type = FilterType.ANNOTATION, classes = Configuration.class)
  )
  public @interface TestAnnotation {
  }
  

• package hello.core;
  
  import hello.core.annotation.TestAnnotation;
  import org.springframework.boot.autoconfigure.SpringBootApplication;
  import org.springframework.context.annotation.ComponentScan;
  import org.springframework.context.annotation.Configuration;
  import org.springframework.context.annotation.FilterType;
  
  //@Configuration
  //@ComponentScan(
  //        excludeFilters = @ComponentScan.Filter(type = FilterType.ANNOTATION, classes = Configuration.class)
  //)
  //@SpringBootApplication
  @TestAnnotation
  @Configuration
  public class AutoAppConfig {
  
  }

• 결과 (정상 작동)