인프런 커뮤니티 질문&답변

chl.cken님의 프로필 이미지
chl.cken

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스프링 핵심 원리 - 기본편

인터페이스 InitializingBean, DisposableBean

똑같이 따라 쳤는데 null이 뜹니다..

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0

안녕하세요 강의 잘보고 있습니다!! 

코드를 따라치다가 계속해서 setUrl의 값을 받지 못하고, null값만 뱉어 냅니다.. 아무리 찾아봐도 모르겠어서 질문 남깁니다.. 어는 부분에서 문제가 생긴건가요...? 감사합니다!

 

package hello.core.lifecycle;

import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;

public class NetworkClient implements InitializingBean, DisposableBean {

    private String url;

    public NetworkClient() {
        System.out.println("생성자호출, url = " + url);
    }

    public void setUrl(String Url) {
        this.url = url;
    }

    //서비스 시작시 호출
    public void connect() {
        System.out.println("connect: " + url);
    }

    public void call(String message){
        System.out.println("call: " + url + " message =" + message);

    }

    //서비스 종료시 호출
    public void disConnect() {
        System.out.println("close " + url);

    }

    //의존관계 주입이 끝나면 호출 됨
    @Override
    public void afterPropertiesSet() throws Exception {
        System.out.println("NetworkClient.afterPropertiesSet");
        connect();
        call("초기화 연결 메시지");

    }

    @Override
    public void destroy() throws Exception {
        System.out.println("NetworkClient.destory");
        disConnect();
    }
}

 

package hello.core.lifecycle;


import org.junit.jupiter.api.Test;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

public class BeanLifeCycleTest {

    @Test
    public void lifeCycleTest() {
        ConfigurableApplicationContext ac = new AnnotationConfigApplicationContext(LifeCycleConfig.class);
        NetworkClient client = ac.getBean(NetworkClient.class);
        ac.close();
    }

    @Configuration
    static class LifeCycleConfig {

        @Bean
        public NetworkClient networkClient() {
            NetworkClient networkClient = new NetworkClient();
            networkClient.setUrl("http://hello-spring.dev");
            return networkClient;
        }
    }
}




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com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit5 hello.core.lifecycle.BeanLifeCycleTest,lifeCycleTest
15:53:33.453 [main] DEBUG org.springframework.context.annotation.AnnotationConfigApplicationContext - Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@6253c26
15:53:33.472 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalConfigurationAnnotationProcessor'
15:53:33.615 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerProcessor'
15:53:33.620 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerFactory'
15:53:33.624 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalAutowiredAnnotationProcessor'
15:53:33.626 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalCommonAnnotationProcessor'
15:53:33.634 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'beanLifeCycleTest.LifeCycleConfig'
15:53:33.641 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'networkClient'
생성자호출, url = null
NetworkClient.afterPropertiesSet
connect: null
call: null message =초기화 연결 메시지
15:53:33.756 [main] DEBUG org.springframework.context.annotation.AnnotationConfigApplicationContext - Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@6253c26, started on Thu Apr 07 15:53:33 KST 2022
NetworkClient.destory
close null

Process finished with exit code 0
springoop

답변 1

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David님의 프로필 이미지
David

안녕하세요. chl.cken님, 공식 서포터즈 David입니다.

String Url (url이 대문자로 시작)이라고 선언하셨는데 메서드 바디에서는 url(소문자 시작)을 this.url에 할당하고 있습니다. 파라미터명을 적절하게 변경해주세요.

 

public void setUrl(String Url) {
        this.url = url;
    }

감사합니다.

chl.cken님의 프로필 이미지
chl.cken
질문자

헐..................감사합니다....하이고 민망하네요 ....

죽어도 안보이던데..ㅠㅠㅠ감사합니다!

 

chl.cken님의 프로필 이미지
chl.cken

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