Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause 에러해결

문제 발생

 

아래와 같은 에러가 발생했습니다...

2022-12-26 11:43:40.857 ERROR 11104 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause

java.lang.NullPointerException: null
	at econo.app.sleeper.web.diary.DiaryController.saveDiary(DiaryController.java:56) ~[main/:na]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-5.3.23.jar:5.3.23]
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150) ~[spring-web-5.3.23.jar:5.3.23]
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1071) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:964) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:696) ~[tomcat-embed-core-9.0.68.jar:4.0.FR]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:779) ~[tomcat-embed-core-9.0.68.jar:4.0.FR]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.68.jar:9.0.68]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.23.jar:5.3.23]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.23.jar:5.3.23]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.23.jar:5.3.23]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.23.jar:5.3.23]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:142) ~[spring-session-core-2.7.0.jar:2.7.0]
	at org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:82) ~[spring-session-core-2.7.0.jar:2.7.0]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.23.jar:5.3.23]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.23.jar:5.3.23]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1789) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
	at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]

 

 

현재 상황

 

@Slf4j
@RestController
@RequiredArgsConstructor
@RequestMapping("/diary-management")
public class DiaryController {

    DiaryService diaryService;

    @PostMapping("/diaries")
    public ResponseEntity<DiaryResponse> saveDiary(DiaryRequestForm diaryRequestForm, @SessionAttribute(SessionConst.LOGIN_USER) Object loginUser) {
        LoginUser loginUser1 = (LoginUser) loginUser;
        System.out.println("loginUser1 = " + loginUser1.getUserId());
        System.out.println("diaryRequestForm = " + diaryRequestForm.getContent());
        System.out.println("diaryRequestForm = " + diaryRequestForm.getLocalDateTime());

        System.out.println("---------------------------------------------");

        DiaryDto diaryDto = DiaryDto.of(loginUser1.getUserId(), diaryRequestForm.getContent(), diaryRequestForm.getLocalDateTime());

        System.out.println("diaryDto = " + diaryDto.getUserId());
        System.out.println("diaryDto.getContent() = " + diaryDto.getContent());
        System.out.println("diaryDto.getLocalDateTime() = " + diaryDto.getLocalDateTime());

        System.out.println("---------------------------------------------");

        DiaryResponse diaryResponse = diaryService.saveDiary(diaryDto);
        System.out.println("diaryResponse = " + diaryResponse.getDiaryPk());
        System.out.println("diaryResponse.getIncreasedMoney() = " + diaryResponse.getIncreasedMoney());

        System.out.println("---------------------------------------------");
        return new ResponseEntity<>(diaryResponse,HttpStatus.CREATED);
    }

 

@Service
@Transactional(readOnly = true)
public class DiaryService {

    private final DiaryRepository diaryRepository;
    private final UserRepository userRepository;

    @Autowired
    public DiaryService(DiaryRepository diaryRepository, UserRepository userRepository) {
        this.diaryRepository = diaryRepository;
        this.userRepository = userRepository;
    }

    @Transactional
    public DiaryResponse saveDiary(DiaryDto diaryDto){
        System.out.println("---------------------------------------------");
        System.out.println("diaryDto = " + diaryDto.getContent());
        System.out.println("diaryDto.getUserId() = " + diaryDto.getUserId());
        System.out.println("diaryDto = " + diaryDto.getLocalDateTime());
        System.out.println("---------------------------------------------");
        LocalDate localDate = DateJudgementUtil.checkSavingDate(diaryDto.getLocalDateTime());
        System.out.println("---------------------------------------------");
        User user = userRepository.findById(diaryDto.getUserId()).get();// 로그인 할 때 필터링이 되있기 때문에 null 체크 안 함
        System.out.println("user.getUserPk() = " + user.getUserPk());
        System.out.println("user.getUserMoney() = " + user.getUserMoney());
        System.out.println("---------------------------------------------");
        Diary diary = diaryDto.toEntity(localDate, user);
        diaryRepository.save(diary);

        System.out.println("---------------------------------------------");
        // 돈 증가
        Integer judgeMoney = MoneyManager.judgeMoney(diaryDto.getContent());
        Integer increasedMoney = MoneyManager.earnMoney(user.getUserMoney(), judgeMoney);
        user.updateMoney(increasedMoney);

        System.out.println("---------------------------------------------");
        return DiaryResponse.of(diary.getDiaryPk(),judgeMoney);
    }

 

 

NullPointerException이라니... Controller에서 Servcie로 넘어갈 때 dto의 값 중에 null값이 있나, 아니면 dto 자체가 null값이 되버렸나...

 

그런데..

 

 

dto도 존재하고 값도 다 있고, 근데 왜 안 되는 걸까요??

 

눈치 빠른 분은 아셨겠지만, 제 프로젝트 소스코드중 Controller에 잘못된 부분이 있죠...

 

네.. 바로 private final을 필드에 선언을 해주지 않아 Spring에서 diaryService에 Bean이 주입이 되지 않았습니다ㅠㅠ

 

 

문제 해결

 

private final DiaryService diaryService;

 

여러분 항상 정신 차리고 코딩하셔야 합니다...

 

 

이상입니다 !!

 

파이팅~~!!!