인프런 커뮤니티 질문&답변

학습하는 분들께 도움이 되고, 더 좋은 답변을 드릴 수 있도록 질문전에 다음을 꼭 확인해주세요.



질문 시에는 위 내용은 삭제하고 다음 내용을 남겨주세요.
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[질문 템플릿]
1. 강의 내용과 관련된 질문인가요? (예)
2. 인프런의 질문 게시판과 자주 하는 질문에 없는 내용인가요? (예)
3. 질문 잘하기 메뉴얼을 읽어보셨나요? (예)

[질문 내용]
강의 영상 2:17 쯤 부분입니다.

OrderServiceImpl 의 파라미터 명을 rateDiscountPolicy로 바꾸었습니다.

그리고 basicScan() 테스트 코드 하나만 돌렸음에도 available: expected single matching bean but found 2: fixDiscountPolicy,rateDiscountPolicy 오류가 납니다.

강의 영상에서도 분명 저 부분 하나만 바꿨고 똑같이 basicScan() 테스트 코드 하나만 돌려서 오류 없이 성공했는데 왜 제가 똑같이 시도했을 때 오류가 나는지 이유를 찾을 수없어 질문 드립니다.

이전에도 비슷한 질문이 있어 살펴보았으나 이 상황에 해결책이 되지 않았습니다. 제가 궁금한건 왜 강의를 똑같이 따라했음에도 왜 '필드명 매칭' 이 되지 않는지, 그리고 '필드명 매칭으로 테스트를 성공하기 위해서 어떻게 해야하는지' 즉 해결책 입니다.

아래는 제 코드 입니다.

@Component
public class OrderServiceImpl implements OrderService {

    private final MemberRepository memberRepository;
    private final DiscountPolicy discountPolicy;

    @Autowired
    public OrderServiceImpl(MemberRepository memberRepository, DiscountPolicy rateDiscountPolicy) {
        this.memberRepository = memberRepository;
        this.discountPolicy = rateDiscountPolicy;
    }

    @Override
    public Order createOrder(Long memberId, String itemName, int itemPrice) {
        Member member = memberRepository.findById(memberId);
        int discountPrice = discountPolicy.discount(member, itemPrice);

        return new Order(memberId, itemName, itemPrice, discountPrice);
    }

    // 테스트 용도
    public MemberRepository getMemberRepository() {
        return memberRepository;
    }
}

@Test
void basicScan() {
    AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(AutoAppConfig.class);

    MemberService memberService = ac.getBean(MemberService.class);
    assertThat(memberService).isInstanceOf(MemberService.class);

    OrderServiceImpl bean = ac.getBean(OrderServiceImpl.class);
    MemberRepository memberRepository = bean.getMemberRepository();
    System.out.println("memberRepository = " + memberRepository);
}

그리고 오류 메시지 입니다.

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'orderServiceImpl' defined in file [C:\Users\user\Documents\인프런 강의 플젝\core\core\out\production\classes\hello\core\order\OrderServiceImpl.class]: Unsatisfied dependency expressed through constructor parameter 1: No qualifying bean of type 'hello.core.discount.DiscountPolicy' available: expected single matching bean but found 2: fixDiscountPolicy,rateDiscountPolicy

at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:804)

at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:240)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1395)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1232)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:569)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:529)

at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:339)

at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:373)

at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:337)

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)

at org.springframework.beans.factory.support.DefaultListableBeanFactory.instantiateSingleton(DefaultListableBeanFactory.java:1222)

at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingleton(DefaultListableBeanFactory.java:1188)

at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:1123)

at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:987)

at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:627)

at org.springframework.context.annotation.AnnotationConfigApplicationContext.<init>(AnnotationConfigApplicationContext.java:93)

at hello.core.scan.AutoAppConfigTest.basicScan(AutoAppConfigTest.java:16)

at java.base/java.lang.reflect.Method.invoke(Method.java:568)

at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)

at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)

Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'hello.core.discount.DiscountPolicy' available: expected single matching bean but found 2: fixDiscountPolicy,rateDiscountPolicy

at org.springframework.beans.factory.config.DependencyDescriptor.resolveNotUnique(DependencyDescriptor.java:218)

at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1722)

at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1628)

at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:913)

at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791)

... 19 more