서블릿mvc, frontcontrollerv1 회원목록 조회시 오류가 납니다.

Question

학습하는 분들께 도움이 되고, 더 좋은 답변을 드릴 수 있도록 질문전에 다음을 꼭 확인해주세요. 1. 강의 내용과 관련된 질문을 남겨주세요. 2. 인프런의 질문 게시판과 자주 하는 질문(링크)을 먼저 확인해주세요. (자주 하는 질문 링크: https://bit.ly/3fX6ygx) 3. 질문 잘하기 메뉴얼(링크)을 먼저 읽어주세요. (질문 잘하기 메뉴얼 링크: https://bit.ly/2UfeqCG) 질문 시에는 위 내용은 삭제하고 다음 내용을 남겨주세요. ========================================= [질문 템플릿] 1. 강의 내용과 관련된 질문인가요? (예/아니오) 2. 인프런의 질문 게시판과 자주 하는 질문에 없는 내용인가요? (예/아니오) 3. 질문 잘하기 메뉴얼을 읽어보셨나요? (예/아니오) [질문 내용] 여기에 질문 내용을 남겨주세요. 서블릿과, JSP는 회원목록 조회시 잘 작동하지만 서블릿mvc, frontcontrollerv1 회원목록 조회시 whitelabel error와 함께 500에러가 뜹니다.   2023-08-25T15:26:44.301+09:00 ERROR 1989 --- [nio-8080-exec-2] o.a.c.c.C.[.[.[.[mvcMemberListServlet] : Servlet.service() for servlet [mvcMemberListServlet] in context with path [] threw exception [java.lang.ClassNotFoundException: org.apache.jsp.WEB_002dINF.views.members_jsp] with root cause   처음에 /webapp/WEB-INF/views/members.jsp 에서 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> 이 구문이 빨간색으로 오류가 떴었는데, build.gradle에 implementation group: 'javax.servlet', name: 'jstl', version: '1.2' 를 적용하니까 빨간색은 없어졌습니다.   그런데도 실행이 안되니까 답답하네요...소스코드는 강의 자료랑 비교해봐도 똑같습니다.   아무리 검색해봐도 해결방법이 나오질 않아서 질문 올립니다.

minn hyo · Answer

2024년 10월 25일 기준 아래 태그로 적용해야합니다. <%@ taglib prefix = "c" uri = "jakarta.tags.core" %> 해당 강의학습 날짜에 따라 아래 공식문서에 맞게 적용해야합니다. https://jakarta.ee/specifications/tags/3.0/tagdocs/

OMG · Answer

안녕하세요. rlawjddn103님, 공식 서포터즈 OMG입니다. 도움을 드리고 싶지만 질문 내용만으로는 답변을 드리기 어려워 코드를 살펴보면서 확인해봐야 알 것 같습니다. 실제 동작하는 전체 프로젝트를 압축해서 구글 드라이브로 공유해서 링크를 남겨주세요. 구글 드라이브 업로드 방법은 다음을 참고해주세요. https://bit.ly/3fX6ygx 주의: 업로드시 링크에 있는 권한 문제 꼭 확인해주세요   감사합니다.

OMG · Answer

안녕하세요. rlawjddn103님, 공식 서포터즈 OMG입니다. 코드에서 문제가 안보인다면 아래 예외 메시지를 보았을 때 패키지 경로(이름)가 강의와 다른지 확인 해주세요 :) WEB_002dINF 이 부분이 강의에서 작성하지 않은 이름 같습니다 ^^ java.lang.ClassNotFoundException: org.apache.jsp. WEB_002dINF .views.members_jsp   감사합니다.

rlawjddn103 · Answer

java.lang.ClassNotFoundException: org.apache.jsp.WEB_002dINF.views.members_jsp at java.base/java.net.URLClassLoader.findClass( URLClassLoader.java:445 ) ~[na:na] at org.apache.jasper.servlet.JasperLoader.loadClass( JasperLoader.java:129 ) ~[tomcat-embed-jasper-10.1.11.jar:10.1.11] at org.apache.jasper.servlet.JasperLoader.loadClass( JasperLoader.java:58 ) ~[tomcat-embed-jasper-10.1.11.jar:10.1.11] at org.apache.catalina.core.DefaultInstanceManager.newInstance( DefaultInstanceManager.java:151 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.jasper.servlet.JspServletWrapper.getServlet( JspServletWrapper.java:189 ) ~[tomcat-embed-jasper-10.1.11.jar:10.1.11] at org.apache.jasper.servlet.JspServletWrapper.service( JspServletWrapper.java:410 ) ~[tomcat-embed-jasper-10.1.11.jar:10.1.11] at org.apache.jasper.servlet.JspServlet.serviceJspFile( JspServlet.java:380 ) ~[tomcat-embed-jasper-10.1.11.jar:10.1.11] at org.apache.jasper.servlet.JspServlet.service( JspServlet.java:328 ) ~[tomcat-embed-jasper-10.1.11.jar:10.1.11] at jakarta.servlet.http.HttpServlet.service( HttpServlet.java:658 ) ~[tomcat-embed-core-10.1.11.jar:6.0] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:205 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:149 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.tomcat.websocket.server.WsFilter.doFilter( WsFilter.java:51 ) ~[tomcat-embed-websocket-10.1.11.jar:10.1.11] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:174 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:149 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.springframework.web.filter.OncePerRequestFilter.doFilter( OncePerRequestFilter.java:110 ) ~[spring-web-6.0.11.jar:6.0.11] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:174 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:149 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.springframework.web.filter.OncePerRequestFilter.doFilter( OncePerRequestFilter.java:110 ) ~[spring-web-6.0.11.jar:6.0.11] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:174 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:149 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.springframework.web.filter.OncePerRequestFilter.doFilter( OncePerRequestFilter.java:110 ) ~[spring-web-6.0.11.jar:6.0.11] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:174 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:149 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.core.ApplicationDispatcher.invoke( ApplicationDispatcher.java:642 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.core.ApplicationDispatcher.processRequest( ApplicationDispatcher.java:408 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.core.ApplicationDispatcher.doForward( ApplicationDispatcher.java:340 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.core.ApplicationDispatcher.forward( ApplicationDispatcher.java:277 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at hello.servlet.web.servletmvc.MvcMemberListServlet.service( MvcMemberListServlet.java:32 ) ~[classes/:na] at jakarta.servlet.http.HttpServlet.service( HttpServlet.java:658 ) ~[tomcat-embed-core-10.1.11.jar:6.0] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:205 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:149 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.tomcat.websocket.server.WsFilter.doFilter( WsFilter.java:51 ) ~[tomcat-embed-websocket-10.1.11.jar:10.1.11] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:174 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:149 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.springframework.web.filter.RequestContextFilter.doFilterInternal( RequestContextFilter.java:100 ) ~[spring-web-6.0.11.jar:6.0.11] at org.springframework.web.filter.OncePerRequestFilter.doFilter( OncePerRequestFilter.java:116 ) ~[spring-web-6.0.11.jar:6.0.11] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:174 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:149 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.springframework.web.filter.FormContentFilter.doFilterInternal( FormContentFilter.java:93 ) ~[spring-web-6.0.11.jar:6.0.11] at org.springframework.web.filter.OncePerRequestFilter.doFilter( OncePerRequestFilter.java:116 ) ~[spring-web-6.0.11.jar:6.0.11] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:174 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:149 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal( CharacterEncodingFilter.java:201 ) ~[spring-web-6.0.11.jar:6.0.11] at org.springframework.web.filter.OncePerRequestFilter.doFilter( OncePerRequestFilter.java:116 ) ~[spring-web-6.0.11.jar:6.0.11] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:174 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:149 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.core.StandardWrapperValve.invoke( StandardWrapperValve.java:166 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.core.StandardContextValve.invoke( StandardContextValve.java:90 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.authenticator.AuthenticatorBase.invoke( AuthenticatorBase.java:482 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.core.StandardHostValve.invoke( StandardHostValve.java:115 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.valves.ErrorReportValve.invoke( ErrorReportValve.java:93 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.core.StandardEngineValve.invoke( StandardEngineValve.java:74 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.catalina.connector.CoyoteAdapter.service( CoyoteAdapter.java:341 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.coyote.http11.Http11Processor.service( Http11Processor.java:391 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.coyote.AbstractProcessorLight.process( AbstractProcessorLight.java:63 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process( AbstractProtocol.java:894 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.tomcat.util.net .NioEndpoint$SocketProcessor.doRun( NioEndpoint.java:1740 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.tomcat.util.net.SocketProcessorBase.run ( SocketProcessorBase.java:52 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker( ThreadPoolExecutor.java:1191 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run( ThreadPoolExecutor.java:659 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run( TaskThread.java:61 ) ~[tomcat-embed-core-10.1.11.jar:10.1.11] at java.base/java.lang.Thread.run( Thread.java:1623 ) ~[na:na]