인프런 커뮤니티 질문&답변

package hello.core.scope;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Scope;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

import static org.assertj.core.api.AssertionsForClassTypes.assertThat;

public class SingletonWithPrototypeTest1 {
    @Test
    void prototypeFind() {
        AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(ClientBean.class, PrototypeBean.class);
        PrototypeBean prototypeBean1 = ac.getBean(PrototypeBean.class);
        prototypeBean1.addCount();
        assertThat(prototypeBean1.getCount()).isEqualTo(1);

        PrototypeBean prototypeBean2 = ac.getBean(PrototypeBean.class);
        prototypeBean2.addCount();
        assertThat(prototypeBean2.getCount()).isEqualTo(1);
    }

    @Test
    public void singletonClientUsePrototype() {
        AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(ClientBean.class, PrototypeBean.class);

        ClientBean clientBean1 = ac.getBean(ClientBean.class);
        int count1 = clientBean1.logic();
        assertThat(count1).isEqualTo(1);

        ClientBean clientBean2 = ac.getBean(ClientBean.class);
        int count2 = clientBean2.logic();
        assertThat(count2).isEqualTo(2);
    }

    @Scope("singleton")
    static class ClientBean {
        private final PrototypeBean prototypeBean;

        @Autowired
        public ClientBean(PrototypeBean prototypeBean) {
            this.prototypeBean = prototypeBean;
        }

        public int logic() {
            prototypeBean.addCount();
            return prototypeBean.getCount();
        }
    }

    @Scope("prototype")
    static class PrototypeBean {
        private int count = 0;

        public void addCount() {
            count++;
        }

        public int getCount() {
            return count;
        }

        @PostConstruct
        public void init() {
            System.out.println("PrototypeBean.init " + this);
        }

        @PreDestroy
        public void destroy() {
            System.out.println("PrototypeBean.destroy");
        }
    }

}

위 코드에서 @Autowired 부분에서

Error:(43, 10) Autowired members must be defined in valid Spring bean (@Component|@Service|...)

에러가 발생합니다. 스프링 빈으로 등록되어 있지 않아서 발생하는 오류라고 생각됩니다. 하지만 강사님 코드에서는 발생하지 않아서 제가 뭘 빠뜨린 것 같은데 그게 무엇인지 모르겠습니다.

테스트는 돌려보면 잘 작동하고 통과가 됩니다.