1. 강의 내용과 관련된 질문인가요? 예2. 인프런의 질문 게시판과 자주 하는 질문에 없는 내용인가요? 예3. 질문 잘하기 메뉴얼을 읽어보셨나요? 아니오[질문 내용]강의 마지막에 강사님께서 디자이너, 웹 퍼블리셔, 백엔드 개발자가 협업하여 서비스를 제작하게 된다는 설명을 해주셨습니다. 참고 부분에서 질문하고 싶은 부분이 있습니다. 마지막 문장에서 "백엔드 개발자는 HTML 뷰 템플릿을 직접 만지는 대신에, HTTP API를 통해 웹 클라이언트가 필요로 하는 데이터와 기능을 제공하면 된다."라고 적혀있었는데 HTTP API를 설계하는 것은 백엔드 개발자가 하는 것은 당연하지만, 어떤 HTTP API를 요구하는 지에 대해서는 프론트엔드 개발자가 하는 것인지 백엔드 개발자가 하는 것인지는 궁금합니다.설명을 덧붙이자면 디자이너분이 제공한 게시판 뷰가 있을 때 제공된 뷰에서 프론트 엔드 개발자가 화면을 만들기 위해서 백엔드 개발자에게 API를 요구하는 편이 일반적인지 혹은 백엔드 개발자가 API를 설계하여 일방적으로 프론트 개발자에게 제공하는게 일반적인지 궁금합니다. 감사합니다.

메모리 맵 입출력 방식에 메모리와 입출력 장치에 같은명령어 사용 가능이라고 하셨는데 명령어에 입출력 전용 명령어도 포함 인가요?? 

<script setup> 이런식으로 쓰는것과<script> export default { setup() { return ~~~ } }</script>이렇게 쓰는거는 뭐가 다른건가요??최신문법은 뭔가요??

선생님 레슨, 책, 유튜브 잘 보고 있습니다.플러터 챗 봇 앱 만들었는데 아이폰 시뮬레이터에서는 잘 돌아가는데 안드로이드 에뷸레이터에서는 아래와 같은 에러가 뜨고채팅 창에 글자도 입력이 안되네요현재 구글 플레이 스토어에 출시는 한 상태입니다. 보시면 전송 버튼을 눌러도 아무런 응답이 없습니다.어떻게 해결하면 좋을까요?앱 이름은 '친절한 한쌤' 입니다. 빠른 답변 늘 감사합니다...  Launching lib/main.dart on sdk gphone64 x86 64 in debug mode...Running Gradle task 'assembleDebug'...✓ Built build/app/outputs/flutter-apk/app-debug.apk.Debug service listening on ws://127.0.0.1:53849/OrbnIHJyefU=/wsSyncing files to device sdk gphone64 x86 64...I/ImeTracker( 4545): com.aihanssam.kindteacherhan:a09ac563: onRequestShow at ORIGIN_CLIENT_SHOW_SOFT_INPUT reason SHOW_SOFT_INPUTD/InputMethodManager( 4545): showSoftInput() view=io.flutter.embedding.android.FlutterView{86562a2 VFE...... .F....ID 0,0-1080,1857 #1 aid=1073741824} flags=0 reason=SHOW_SOFT_INPUTI/AssistStructure( 4545): Flattened final assist data: 472 bytes, containing 1 windows, 3 viewsD/EGL_emulation( 4545): app_time_stats: avg=15687.04ms min=37.24ms max=46608.22ms count=3D/InsetsController( 4545): show(ime(), fromIme=true)I/ImeTracker( 4545): com.aihanssam.kindteacherhan:a09ac563: onShownD/EGL_emulation( 4545): app_time_stats: avg=205.99ms min=65.45ms max=322.47ms count=5D/EGL_emulation( 4545): app_time_stats: avg=293.51ms min=39.90ms max=566.13ms count=4D/EGL_emulation( 4545): app_time_stats: avg=500.04ms min=499.71ms max=500.36ms count=2D/EGL_emulation( 4545): app_time_stats: avg=499.55ms min=483.14ms max=516.56ms count=3D/EGL_emulation( 4545): app_time_stats: avg=500.43ms min=499.89ms max=500.97ms count=2D/EGL_emulation( 4545): app_time_stats: avg=500.48ms min=500.24ms max=500.72ms count=2

 a = {1, 'Hello', True, 1.233 }print (a) 를 하니 True만 제외하고 나오는데요,boolean 타입은 set에서 사용이 불가능한 걸까요?

요소공개트리거 활용 파트 강의 듣다가 질문남깁니다.중앙 배너에 노출된 사람이 중앙 배너를 클릭했는지 알아보려면 매개변수를 어떻게 해야하나요? 

visible, non-interactive elements with an on:click event must be accompanied by an on:keydown, on:keyup, or on:keypress eventdiv에 on:click를 붙일 때 위와 같은 문구가 표시됩니다.on:key와 관련된 이벤트를 붙이니까 해당 문구가 사라지던데 꼭 그렇게 사용해야 하나요? 제가 div에 onclick 이벤트를 자주 쓰는데 div가 아닌 button을 사용해야 할 까요?

a = {0: 'Hello World'}a.update ( 0 = 'Hello Python')로 돌리면 오류가 발생하는데, 숫자 key에서는 update 함수 사용이 불가한가요?

이 에러는 왜 발생한 건가요?구글에 검색도 해봤는데 안나오네요도와주세요 ㅠreducers/user.js 코드입니다export const initialState = { } export const loginAction = (data) => { return { type: 'LOG_IN', data, } } export const logoutAction = () => { return { type: 'LOG_OUT', } } const reducer = (State = initialState, action) => { switch (action.type) { case 'LOG_IN': { return { ...state, isLoggedIn: true, user: action.data, }; } case 'LOG_OUT': { return { ...state, isLoggedIn: false, user: null, }; } default: return state; } }; export default reducer; 터미널창 오류 메세지 입니다error - reducers/user.js (37:12) @ reducererror - ReferenceError: state is not defined at reducer (webpack-internal:///./reducers/user.js:39:13) at /Users/hyeonyeongjeong/Documents/2023project/nodebird/prepare/front/node_modules/redux/lib/redux.js:476:24 at Array.forEach (<anonymous>) at assertReducerShape (/Users/hyeonyeongjeong/Documents/2023project/nodebird/prepare/front/node_modules/redux/lib/redux.js:474:25) at combineReducers (/Users/hyeonyeongjeong/Documents/2023project/nodebird/prepare/front/node_modules/redux/lib/redux.js:539:5) at eval (webpack-internal:///./reducers/index.js:15:75) at Object../reducers/index.js (/Users/hyeonyeongjeong/Documents/2023project/nodebird/prepare/front/.next/server/pages/_app.js:33:1) at __webpack_require__ (/Users/hyeonyeongjeong/Documents/2023project/nodebird/prepare/front/.next/server/webpack-runtime.js:33:42) at eval (webpack-internal:///./store/configureStore.js:9:67) at Object../store/configureStore.js (/Users/hyeonyeongjeong/Documents/2023project/nodebird/prepare/front/.next/server/pages/_app.js:66:1) { page: '/'} 35 | } 36 | default:> 37 | return state; | ^ 38 | 39 | } 40 | };event - compiled client and server successfully in 100 ms (1518 modules)4. WrappedApp created new store with withRedux(NodeBird) { initialState: undefined, initialStateFromGSPorGSSR: undefined }ReferenceError: state is not defined at reducer (webpack-internal:///./reducers/user.js:39:13) at /Users/hyeonyeongjeong/Documents/2023project/nodebird/prepare/front/node_modules/redux/lib/redux.js:476:24 at Array.forEach (<anonymous>) at assertReducerShape (/Users/hyeonyeongjeong/Documents/2023project/nodebird/prepare/front/node_modules/redux/lib/redux.js:474:25) at combineReducers (/Users/hyeonyeongjeong/Documents/2023project/nodebird/prepare/front/node_modules/redux/lib/redux.js:539:5) at eval (webpack-internal:///./reducers/index.js:15:75) at Object../reducers/index.js (/Users/hyeonyeongjeong/Documents/2023project/nodebird/prepare/front/.next/server/pages/_app.js:33:1) at __webpack_require__ (/Users/hyeonyeongjeong/Documents/2023project/nodebird/prepare/front/.next/server/webpack-runtime.js:33:42) at eval (webpack-internal:///./store/configureStore.js:9:67) at Object../store/configureStore.js (/Users/hyeonyeongjeong/Documents/2023project/nodebird/prepare/front/.next/server/pages/_app.js:66:1) http://localhost:3060 에 뜬 오류 입니다 Server ErrorReferenceError: state is not definedThis error happened while generating the page. Any console logs will be displayed in the terminal window.Sourcereducers/user.js (35:12) @ reducer 33 | } 34 | default: > 35 | return state; | ^ 36 | 37 | } 38 | };

Could not connect to New MySQL. Error creating SQL Model Connection connection to New MySQL. (Error: Could not create connection to database server.) Could not create connection to database server. Error creating JDBC Connection connection to New MySQL. (Error: Could not create connection to database server.) Could not create connection to database server.계속 이 에러가 뜨면서 Mysql 연결이 안됩니다..구글링 해봤는데도 해결이 안되네요..

튜플을 리스트로 변환하여 수정한 후 튜플로 다시 변환해도 사용에 문제가 없을까요?예를 들어,a = (1, 2, 3)list_a = list(a)list_a [0] = 2 print(list_a) = [2, 2, 3]tuple_a = tuple(list_a) print(tuple_a) = (2, 2, 3)  또한, 튜플 내에 있는 리스트 수정이 가능한 것이 맞을까요? 코드 돌려보았을 때는 가능해 보이는데, 이 경우 불변하는 정보를 담는다는 튜플의 의도에 반하는 게 아닌가 싶어 여쭤봅니다ㅎㅎ;예를 들어,b = (1, [2, 3])b [1][0] = 4print (b) = (1, [4, 3])

안녕하세요.상속관계 매핑을 할 때 예를 들어 위와 같이 Item을 상속받는 Book, Album, Movie, TVSerise의 4개의 품목이 있다고 했을 때, 비슷한 속성끼리 중간에 묶는 방법에 대해 질문드리고 싶습니다.상속관계를 한 단계 더 쓰고 싶은 이유는 일부 항목들끼리는 자주 엮어서 조회할 일이 있는데 그 때마다 두 객체를 모두 불러오는 게 번거롭게 느껴져서 입니다.이전에 비슷한 질문을 드렸었는데 김영한 강사님께서 이런 경우 상속관계보다는 연관관계를 사용하기를 추천하신다고 말씀 주셨었어요. 조금만 더 자세히 설명 부탁드리겠습니다.감사합니다!ps. 다른 글에서 추천해주신 draw.io 좋아요. 감사합니다.

안녕하세요. 강의에서 일반문과 그것의 축약문의 어셈블리 비교를 통해 효율성을 체크했습니다.그냥 보면 둘은 똑같아 보였는데, 자세히 보니 끝에서 두 자리가 다르더군요.이건 제 단계에서 크게 신경쓰지 않아도 되는 것 같은데, 그래도 궁금해서 질문드립니다.일반문과 축약문의 어셈블리가 완전 같지는 않은데, 저 정도는 효율성을 따지는데 있어 굳이 신경 쓰지 않아도 되는 건가요?

[질문 템플릿]1. 강의 내용과 관련된 질문인가요? 예2. 인프런의 질문 게시판과 자주 하는 질문에 없는 내용인가요? 예3. 질문 잘하기 메뉴얼을 읽어보셨나요? 예[질문 내용]여기에 질문 내용을 남겨주세요.new-form.jsp는 잘 접속이 되는데전송을 누르면 아래와 같이 오류가 발생합니다."C:\Program Files\Java\jdk-17.0.2\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2022.3.2\lib\idea_rt.jar=64020:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2022.3.2\bin" -Dfile.encoding=UTF-8 -classpath C:\Users\user\Desktop\여름방학\mvc1\servlet\servlet\out\production\classes;C:\Users\user\Desktop\여름방학\mvc1\servlet\servlet\out\production\resources;C:\Users\user\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot-starter-data-jpa\3.0.6\d0b6b836a6e3a223a92e6594c2d8c5f0a7cccec\spring-boot-starter-data-jpa-3.0.6.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot-starter-web\3.0.6\7c6597cae584c359d7e4ddea6e006176e0c15936\spring-boot-starter-web-3.0.6.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\jakarta.annotation\jakarta.annotation-api\2.1.1\48b9bda22b091b1f48b13af03fe36db3be6e1ae3\jakarta.annotation-api-2.1.1.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\jakarta.persistence\jakarta.persistence-api\3.1.0\66901fa1c373c6aff65c13791cc11da72060a8d6\jakarta.persistence-api-3.1.0.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\com.github.gavlyukovskiy\p6spy-spring-boot-starter\1.9.0\b51740224ed4f0cdca7ba93fe9167e7b97064f41\p6spy-spring-boot-starter-1.9.0.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\com.querydsl\querydsl-jpa\5.0.0\2a653852848dee41b967d3520be3339f0f92f1ea\querydsl-jpa-5.0.0-jakarta.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\org.apache.tomcat.embed\tomcat-embed-jasper\10.1.8\eefcfd4e175ca6a6db9fc1444bf452ebcf2956a0\tomcat-embed-jasper-10.1.8.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\jakarta.servlet.jsp.jstl\jakarta.servlet.jsp.jstl-api\3.0.0\8ace30b09ce88dc6f19d4f59251cc83a23cc180a\jakarta.servlet.jsp.jstl-api-3.0.0.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\jakarta.servlet\jakarta.servlet-api\6.0.0\abecc699286e65035ebba9844c03931357a6a963\jakarta.servlet-api-6.0.0.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\org.glassfish.web\jakarta.servlet.jsp.jstl\3.0.1\78909a1354585b2a7a2d3b4e348fceff8b6d180\jakarta.servlet.jsp.jstl-3.0.1.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\org.springframework.data\spring-data-jpa\3.0.5\84987fbd727eb0cf2f164dd07fe2bd697ddde8f1\spring-data-jpa-3.0.5.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot-starter-aop\3.0.6\bb39de062db9b7b7a277e6c026ed5ac45f544fc8\spring-boot-starter-aop-3.0.6.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot-starter-jdbc\3.0.6\672661f4a90a9479170fba058a88892dac5ba69c\spring-boot-starter-jdbc-3.0.6.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\org.hibernate.orm\hibernate-core\6.1.7.Final\343f47b34c96fe9c44bf9b219a7b3c5d6d2fc90e\hibernate-core-6.1.7.Final.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\org.springframework\spring-aspects\6.0.8\53e6f4b4136b40cc0a7137fb05e38b45c2c286fe\spring-aspects-6.0.8.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot-starter-json\3.0.6\e0a1dd1653750a8e0a25b7b6be977231d7fa607e\spring-boot-starter-json-3.0.6.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot-starter\3.0.6\1029c155da41fa04820cf81fdbe5752260eead5\spring-boot-starter-3.0.6.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot-starter-tomcat\3.0.6\feae12210905b6cb7ce8affce4f309665c4a805b\spring-boot-starter-tomcat-3.0.6.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\org.springframework\spring-webmvc\6.0.8\10b9481118ecf8ae9dc6f9fb47f95ed6da0e43e\spring-webmvc-6.0.8.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\org.springframework\spring-web\6.0.8\b2d3643c5dd191b07c642adca0de40c303bb7505\spring-web-6.0.8.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\com.github.gavlyukovskiy\datasource-decorator-spring-boot-autoconfigure\1.9.0\831a15b04e176cd41c0539cda6194ac3e6b715ff\datasource-decorator-spring-boot-autoconfigure-1.9.0.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\p6spy\p6spy\3.9.0\7fedf78cc1e53a623a7b36d1f2705790836400aa\p6spy-3.9.0.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\com.querydsl\querydsl-core\5.0.0\7a469f78b7a89bae429f17766fb92687d0ab9e5b\querydsl-core-5.0.0.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\org.apache.tomcat.embed\tomcat-embed-core\10.1.8\ec4b884806c65c80c86bb3db134f6f6f99e79ed8\tomcat-embed-core-10.1.8.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\org.apache.tomcat.embed\tomcat-embed-el\10.1.8\6f3a4ae2ae37270eeb6e9bec4e7207facdc9e8fa\tomcat-embed-el-10.1.8.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\org.eclipse.jdt\ecj\3.33.0\4041d27ffea3c9351e3121f9bfe94dea4723d583\ecj-3.33.0.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\jakarta.el\jakarta.el-api\5.0.0\2a22b304920f43d6427cdefb5ce5f6726e2a63a3\jakarta.el-api-5.0.0.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\org.springframework\spring-context\6.0.8\4550c5e2bbb8cd07647b1b29b47c73cf4732de8c\spring-context-6.0.8.jar;C:\Users\user\.gradle\caches\modules-2\files-2.1\org.springframework\spring-aop\6.0.8\36c4cf00bab58bbcd60134a154e290185fa71bfa\spring-aop-6.0.8.jar;C:\Users\user\.grad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hello.servlet.ServletApplication. ____ _/\\ / ___'_ __ (_)_ _ \ \ \ \( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \\\/ ___)| |_)| | | | | || (_| | ) ) ) )' |____| .__|_| |_|_| |_\__, | / / / /=========|_|==============|___/=/_/_/_/:: Spring Boot :: (v3.0.6)2023-07-10T21:21:29.054+09:00 INFO 18224 --- [ main] hello.servlet.ServletApplication : Starting ServletApplication using Java 17.0.2 with PID 18224 (C:\Users\user\Desktop\여름방학\mvc1\servlet\servlet\out\production\classes started by user in C:\Users\user\Desktop\여름방학\mvc1\servlet\servlet)2023-07-10T21:21:29.057+09:00 INFO 18224 --- [ main] hello.servlet.ServletApplication : No active profile set, falling back to 1 default profile: "default"2023-07-10T21:21:29.690+09:00 INFO 18224 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.2023-07-10T21:21:29.722+09:00 INFO 18224 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 21 ms. Found 0 JPA repository interfaces.2023-07-10T21:21:30.369+09:00 INFO 18224 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)2023-07-10T21:21:30.380+09:00 INFO 18224 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]2023-07-10T21:21:30.380+09:00 INFO 18224 --- [ main] o.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/10.1.8]2023-07-10T21:21:30.613+09:00 INFO 18224 --- [ main] org.apache.jasper.servlet.TldScanner : At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.2023-07-10T21:21:30.622+09:00 INFO 18224 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext2023-07-10T21:21:30.623+09:00 INFO 18224 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1515 ms2023-07-10T21:21:30.874+09:00 INFO 18224 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...2023-07-10T21:21:31.055+09:00 INFO 18224 --- [ main] com.zaxxer.hikari.pool.HikariPool : HikariPool-1 - Added connection conn0: url=jdbc:h2:mem:2a429fff-9c3c-4c40-906c-f7cb210a3f6a user=SA2023-07-10T21:21:31.057+09:00 INFO 18224 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.2023-07-10T21:21:31.109+09:00 INFO 18224 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [name: default]2023-07-10T21:21:31.171+09:00 INFO 18224 --- [ main] org.hibernate.Version : HHH000412: Hibernate ORM core version 6.1.7.Final2023-07-10T21:21:31.473+09:00 INFO 18224 --- [ main] SQL dialect : HHH000400: Using dialect: org.hibernate.dialect.H2Dialect2023-07-10T21:21:31.720+09:00 INFO 18224 --- [ main] o.h.e.t.j.p.i.JtaPlatformInitiator : HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform]2023-07-10T21:21:31.734+09:00 INFO 18224 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'2023-07-10T21:21:31.767+09:00 WARN 18224 --- [ main] JpaBaseConfiguration$JpaWebConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning2023-07-10T21:21:31.964+09:00 INFO 18224 --- [ main] o.s.b.a.w.s.WelcomePageHandlerMapping : Adding welcome page: ServletContext resource [/index.html]2023-07-10T21:21:32.242+09:00 INFO 18224 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''2023-07-10T21:21:32.251+09:00 INFO 18224 --- [ main] hello.servlet.ServletApplication : Started ServletApplication in 3.565 seconds (process running for 3.966)2023-07-10T21:21:38.052+09:00 DEBUG 18224 --- [nio-8080-exec-1] o.a.coyote.http11.Http11InputBuffer : Before fill(): parsingHeader: [true], parsingRequestLine: [true], parsingRequestLinePhase: [0], parsingRequestLineStart: [0], byteBuffer.position(): [0], byteBuffer.limit(): [0], end: [0]2023-07-10T21:21:38.053+09:00 DEBUG 18224 --- [nio-8080-exec-1] o.a.coyote.http11.Http11InputBuffer : Received [POST /jsp/members/save.jsp HTTP/1.1Host: localhost:8080Connection: keep-aliveContent-Length: 19Cache-Control: max-age=0sec-ch-ua: "Not.A/Brand";v="8", "Chromium";v="114", "Google Chrome";v="114"sec-ch-ua-mobile: ?0sec-ch-ua-platform: "Windows"Upgrade-Insecure-Requests: 1Origin: http://localhost:8080Content-Type: application/x-www-form-urlencodedUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7Sec-Fetch-Site: same-originSec-Fetch-Mode: navigateSec-Fetch-User: ?1Sec-Fetch-Dest: documentReferer: http://localhost:8080/jsp/members/new-form.jspAccept-Encoding: gzip, deflate, brAccept-Language: ko-KR,ko;q=0.9,en-US;q=0.8,en;q=0.7Cookie: JSESSIONID=3F23CBF50B03D193E74C819FC83D3488username=kim&age=20]2023-07-10T21:21:38.623+09:00 ERROR 18224 --- [nio-8080-exec-1] o.a.c.c.C.[.[localhost].[/].[jsp] : Servlet.service() for servlet [jsp] in context with path [] threw exception [Unable to compile class for JSP:An error occurred at line: [14] in the generated java file: [C:\Users\user\AppData\Local\Temp\tomcat.8080.1494250641129783002\work\Tomcat\localhost\ROOT\org\apache\jsp\jsp\members\save_jsp.java]Only a type can be imported. hello.servlet.domain.member.MemberRepository resolves to a packageAn error occurred at line: [15] in the generated java file: [C:\Users\user\AppData\Local\Temp\tomcat.8080.1494250641129783002\work\Tomcat\localhost\ROOT\org\apache\jsp\jsp\members\save_jsp.java]Only a type can be imported. hello.servlet.domain.member.Member resolves to a packageAn error occurred at line: [6] in the jsp file: [/jsp/members/save.jsp]MemberRepository cannot be resolved to a type3: <%@ page contentType="text/html;charset=UTF-8" language="java" %>4: <%5: // request, response 사용 가능6: MemberRepository memberRepository = MemberRepository.getInstance();7: System.out.println("save.jsp");8: String username = request.getParameter("username");9: int age = Integer.parseInt(request.getParameter("age"));An error occurred at line: [6] in the jsp file: [/jsp/members/save.jsp]MemberRepository cannot be resolved3: <%@ page contentType="text/html;charset=UTF-8" language="java" %>4: <%5: // request, response 사용 가능6: MemberRepository memberRepository = MemberRepository.getInstance();7: System.out.println("save.jsp");8: String username = request.getParameter("username");9: int age = Integer.parseInt(request.getParameter("age"));An error occurred at line: [10] in the jsp file: [/jsp/members/save.jsp]Member cannot be resolved to a type7: System.out.println("save.jsp");8: String username = request.getParameter("username");9: int age = Integer.parseInt(request.getParameter("age"));10: Member member = new Member(username, age);11: System.out.println("member = " + member);12: memberRepository.save(member);13: %>An error occurred at line: [10] in the jsp file: [/jsp/members/save.jsp]Member cannot be resolved to a type7: System.out.println("save.jsp");8: String username = request.getParameter("username");9: int age = Integer.parseInt(request.getParameter("age"));10: Member member = new Member(username, age);11: System.out.println("member = " + member);12: memberRepository.save(member);13: %>Stacktrace:] with root causeorg.apache.jasper.JasperException: Unable to compile class for JSP:An error occurred at line: [14] in the generated java file: [C:\Users\user\AppData\Local\Temp\tomcat.8080.1494250641129783002\work\Tomcat\localhost\ROOT\org\apache\jsp\jsp\members\save_jsp.java]Only a type can be imported. hello.servlet.domain.member.MemberRepository resolves to a packageAn error occurred at line: [15] in the generated java file: [C:\Users\user\AppData\Local\Temp\tomcat.8080.1494250641129783002\work\Tomcat\localhost\ROOT\org\apache\jsp\jsp\members\save_jsp.java]Only a type can be imported. hello.servlet.domain.member.Member resolves to a packageAn error occurred at line: [6] in the jsp file: [/jsp/members/save.jsp]MemberRepository cannot be resolved to a type3: <%@ page contentType="text/html;charset=UTF-8" language="java" %>4: <%5: // request, response 사용 가능6: MemberRepository memberRepository = MemberRepository.getInstance();7: System.out.println("save.jsp");8: String username = request.getParameter("username");9: int age = Integer.parseInt(request.getParameter("age"));An error occurred at line: [6] in the jsp file: [/jsp/members/save.jsp]MemberRepository cannot be resolved3: <%@ page contentType="text/html;charset=UTF-8" language="java" %>4: <%5: // request, response 사용 가능6: MemberRepository memberRepository = MemberRepository.getInstance();7: System.out.println("save.jsp");8: String username = request.getParameter("username");9: int age = Integer.parseInt(request.getParameter("age"));An error occurred at line: [10] in the jsp file: [/jsp/members/save.jsp]Member cannot be resolved to a type7: System.out.println("save.jsp");8: String username = request.getParameter("username");9: int age = Integer.parseInt(request.getParameter("age"));10: Member member = new Member(username, age);11: System.out.println("member = " + member);12: memberRepository.save(member);13: %>An error occurred at line: [10] in the jsp file: [/jsp/members/save.jsp]Member cannot be resolved to a type7: System.out.println("save.jsp");8: String username = request.getParameter("username");9: int age = Integer.parseInt(request.getParameter("age"));10: Member member = new Member(username, age);11: System.out.println("member = " + member);12: memberRepository.save(member);13: %>Stacktrace:at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:102) ~[tomcat-embed-jasper-10.1.8.jar:10.1.8]at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:213) ~[tomcat-embed-jasper-10.1.8.jar:10.1.8]at org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:513) ~[tomcat-embed-jasper-10.1.8.jar:10.1.8]at org.apache.jasper.compiler.Compiler.compile(Compiler.java:402) ~[tomcat-embed-jasper-10.1.8.jar:10.1.8]at org.apache.jasper.compiler.Compiler.compile(Compiler.java:372) ~[tomcat-embed-jasper-10.1.8.jar:10.1.8]at org.apache.jasper.compiler.Compiler.compile(Compiler.java:356) ~[tomcat-embed-jasper-10.1.8.jar:10.1.8]at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:603) ~[tomcat-embed-jasper-10.1.8.jar:10.1.8]at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:396) ~[tomcat-embed-jasper-10.1.8.jar:10.1.8]at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:380) ~[tomcat-embed-jasper-10.1.8.jar:10.1.8]at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:328) ~[tomcat-embed-jasper-10.1.8.jar:10.1.8]at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:614) ~[jakarta.servlet-api-6.0.0.jar:6.0.0]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:205) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-10.1.8.jar:10.1.8]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-6.0.8.jar:6.0.8]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.8.jar:6.0.8]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-6.0.8.jar:6.0.8]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.8.jar:6.0.8]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-6.0.8.jar:6.0.8]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.8.jar:6.0.8]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:166) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:341) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:390) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:894) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1741) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-10.1.8.jar:10.1.8]at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]2023-07-10T21:21:38.633+09:00 INFO 18224 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'2023-07-10T21:21:38.634+09:00 INFO 18224 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'2023-07-10T21:21:38.635+09:00 INFO 18224 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 1 ms2023-07-10T21:21:38.743+09:00 DEBUG 18224 --- [nio-8080-exec-1] o.apache.coyote.http11.Http11Processor : Socket: [org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper@53f4c2e:org.apache.tomcat.util.net.NioChannel@1e491a57:java.nio.channels.SocketChannel[connected local=/[0:0:0:0:0:0:0:1]:8080 remote=/[0:0:0:0:0:0:0:1]:64023]], Status in: [OPEN_READ], State out: [CLOSED]  

PS C:\Users\user\Documents\boiler-plate> git push -u origin mainfatal: failed to load library 'libcurl-4.dll'이럴 경우엔 어떻게 깃허브 연결 할 수 있을까요?

하드코딩으로 값을 넣었을때는 잘진행이 되었는데요ㅠㅠ 안에 값을 지정하니 에러가 계속뜨네요 아마 이 부분 에서 고쳐야 할 점이 있는 것 같은데 똑같이 작성을 한 것 같음에도 동작이 안되서 질문드려봅니다

sumArray 함수에서 return 값인sumArray(arr.slice(0, -1)) + arr[arr.length - 1] 구문이 이해가 잘 안되는데arr.slice(0, -1) 은 [1, 2, 3, 4]이고arr[arr.length - 1]은 5인데[1, 2, 3, 4] + 5 값으로는 1, 2, 3, 4, 55 나와야 되는게 아닌가요??어째서 sumArray([1, 2, 3, 4])를 줬다고 해서1 + 2 + 3 + 4 가 되는 지 모르겠습니다.만약 그렇게 되려면 아래 같은 로직이라고 있어야되는거 아닌가요?? let plus = 0; arr.forEach(el => { plus += el });도저히 이해가 안되네요 도와주시면 감사하겠습니다!!

프로바이더를 보고 있다보니 싱글톤이 생각나는데, 둘 간의 차이가 있을까요? 있다면 어떤 차이가 있을 까요?

 안녕하세요. 주피터 노트북 관련해서 궁금한 점이 있는데요, 제가 처음에 지정해놓은 경로에 파일을 두고, 주피터 노트북 실행해서 작업을 하닥, 주피터 노트북 경로 파일 폴더를 열어보니,아래와 같이 .ipynb_checkpoints라는 폴더가 만들어져있더라구요.해당 폴더 안에 들어가보면 원래의 파일들이 해당 폴더 안에 또 만들어져있는데, 이거는 자동으로 백업해주는 기능인가요?

안녕하십니까 큰돌님강의 보기 전에 prefix sum 이 기억이 안나서 혼자 풀어봤는데 어디에서 틀린 건지 모르겠습니다 ㅜㅠhttp://boj.kr/b45a32d5c6db4cda94b0a3177e17291a