Whitelabel Error

Question

안녕하세요. 구글링과 이전 수강생들의 질답을 모두 보았지만, 해결이 되지 않아 이렇게 질문을 올립니다. localhost :8080은 제대로 작동하지만, /hello를 적으면 아래와 같이 500 에러가 발생합니다. 파일 위치 확인 : html 파일과 controller의 파일 위치는 정상적으로 보입니다. thymleaf 의존성 확인 : build.gradle에 의존성을 추가하는 코드 dependencies { implementation 'org.springframework.boot:spring-boot-starter-thymeleaf' } 를 작성하였습니다. 아래는 저의 코드 캡쳐본입니다. 아래는 콘솔창 오류 메세지입니다. 2023-05-16 10:32:18.696 ERROR 7435 --- [nio-8080-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Circular view path [hello]: would dispatch back to the current handler URL [/hello] again. Check your ViewResolver setup! (Hint: This may be the result of an unspecified view, due to default view name generation.)] with root cause javax.servlet.ServletException: Circular view path [hello]: would dispatch back to the current handler URL [/hello] again. Check your ViewResolver setup! (Hint: This may be the result of an unspecified view, due to default view name generation.) at org.springframework.web.servlet.view.InternalResourceView.prepareForRendering( InternalResourceView.java:210 ) ~[spring-webmvc-5.3.15.jar:5.3.15] at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel( InternalResourceView.java:148 ) ~[spring-webmvc-5.3.15.jar:5.3.15] at org.springframework.web.servlet.view.AbstractView.render( AbstractView.java:316 ) ~[spring-webmvc-5.3.15.jar:5.3.15] at org.springframework.web.servlet.DispatcherServlet.render( DispatcherServlet.java:1401 ) ~[spring-webmvc-5.3.15.jar:5.3.15] at org.springframework.web.servlet.DispatcherServlet.processDispatchResult( DispatcherServlet.java:1145 ) ~[spring-webmvc-5.3.15.jar:5.3.15] at org.springframework.web.servlet.DispatcherServlet.doDispatch( DispatcherServlet.java:1084 ) ~[spring-webmvc-5.3.15.jar:5.3.15] at org.springframework.web.servlet.DispatcherServlet.doService( DispatcherServlet.java:963 ) ~[spring-webmvc-5.3.15.jar:5.3.15] at org.springframework.web.servlet.FrameworkServlet.processRequest( FrameworkServlet.java:1006 ) ~[spring-webmvc-5.3.15.jar:5.3.15] at org.springframework.web.servlet.FrameworkServlet.doGet( FrameworkServlet.java:898 ) ~[spring-webmvc-5.3.15.jar:5.3.15] at javax.servlet.http.HttpServlet.service( HttpServlet.java:655 ) ~[tomcat-embed-core-9.0.56.jar: 4.0.FR ] at org.springframework.web.servlet.FrameworkServlet.service( FrameworkServlet.java:883 ) ~[spring-webmvc-5.3.15.jar:5.3.15] at javax.servlet.http.HttpServlet.service( HttpServlet.java:764 ) ~[tomcat-embed-core-9.0.56.jar: 4.0.FR ] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:227 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:162 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.tomcat.websocket.server.WsFilter.doFilter( WsFilter.java:53 ) ~[tomcat-embed-websocket-9.0.56.jar:9.0.56] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:189 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:162 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.springframework.web.filter.RequestContextFilter.doFilterInternal( RequestContextFilter.java:100 ) ~[spring-web-5.3.15.jar:5.3.15] at org.springframework.web.filter.OncePerRequestFilter.doFilter( OncePerRequestFilter.java:117 ) ~[spring-web-5.3.15.jar:5.3.15] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:189 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:162 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.springframework.web.filter.FormContentFilter.doFilterInternal( FormContentFilter.java:93 ) ~[spring-web-5.3.15.jar:5.3.15] at org.springframework.web.filter.OncePerRequestFilter.doFilter( OncePerRequestFilter.java:117 ) ~[spring-web-5.3.15.jar:5.3.15] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:189 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:162 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal( CharacterEncodingFilter.java:201 ) ~[spring-web-5.3.15.jar:5.3.15] at org.springframework.web.filter.OncePerRequestFilter.doFilter( OncePerRequestFilter.java:117 ) ~[spring-web-5.3.15.jar:5.3.15] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:189 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:162 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.catalina.core.StandardWrapperValve.invoke( StandardWrapperValve.java:197 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.catalina.core.StandardContextValve.invoke( StandardContextValve.java:97 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.catalina.authenticator.AuthenticatorBase.invoke( AuthenticatorBase.java:540 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.catalina.core.StandardHostValve.invoke( StandardHostValve.java:135 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.catalina.valves.ErrorReportValve.invoke( ErrorReportValve.java:92 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.catalina.core.StandardEngineValve.invoke( StandardEngineValve.java:78 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.catalina.connector.CoyoteAdapter.service( CoyoteAdapter.java:357 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.coyote.http11.Http11Processor.service( Http11Processor.java:382 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.coyote.AbstractProcessorLight.process( AbstractProcessorLight.java:65 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process( AbstractProtocol.java:895 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.tomcat.util.net .NioEndpoint$SocketProcessor.doRun( NioEndpoint.java:1732 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.tomcat.util.net.SocketProcessorBase.run ( SocketProcessorBase.java:49 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker( ThreadPoolExecutor.java:1191 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run( ThreadPoolExecutor.java:659 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run( TaskThread.java:61 ) ~[tomcat-embed-core-9.0.56.jar:9.0.56] at java.base/java.lang.Thread.run( Thread.java:829 ) ~[na:na]

나무늘보 · Answer

안녕하세요, 신승혜 님! 공식 서포터즈 codesweaver 입니다. 인텔리제이 에디터 우측 상단에 코끼리 로고가 나온 것으로 보아, build.gradle 을 변경하신 이후에 gradle을 다시 빌드하시지 않은 것 같습니다. 우선 gradle을 다시 빌드해주세요. 그리고 Controller @GetMapping 에서 URL을 지정할 때 경로의 시작에 / (슬래시)를 붙여주세요. 가령 hello 를 /hello 로 변경해주세요. 일단 이 부분을 수정 후 다시 시도해주세요 :) 감사합니다.