176만명의 커뮤니티!! 함께 토론해봐요.
미해결
웹 개발의 혁신: C, C++, Rust로 시작하는 WebAssembly 마스터 클래스
안녕하세요 두가지 에러문제로 질문드립니다 1번째는 clock 예제를 시작하고 빌드를 하니까 qmake 스텝에서 오류가 나온다고 합니다 그 전 강의에서 cmake 가 오류가 적다 말씀하셔서 그 부분을 의심하고 qmake를 cmake로 변경하기위해 구글링 해봤지만 설정을 어떻게 바꾸는지 못찾겠습니다..... 2번째는 include를 하는 곳에서 참조가 안된다하는데 추가로 다른 파일을 다운받아야하나요....? 강의에서 보여주신 qt maintenace에서 다운로드 해야하는것은 체크해서 다운받았는데 참조가 안된다고 하네요....
미해결
스프링 프레임워크는 내 손에 [스프1탄]
controller 단에서 호출하는 mapper 가 오류가 나고 있습니다... 화면에서 crud 시킬때 500에러: Request processing failed; nested exception is java.lang.ClassCastException: java.lang.String cannot be cast to kr.board.entity.MemberUser 근본이유: java.lang.ClassCastException: java.lang.String cannot be cast to kr.board.entity.MemberUser kr.board.controller.MemeberController.memRegister( MemeberController.java:118 ). controller에서 syso 찍어가며 넘어가야할 값들이 다 들어있는것을 확인했습니다. 그런데도 매퍼 접근하려고하면 오류가 나고 있습니다. 콘솔에서의 오류: Exception in thread "main" java.lang.NullPointerException at kr.board.controller.BoardRestController.wifiInfoInsert( BoardRestController.java:66 )
해결됨
개발자를 위한 컴퓨터공학 1: 혼자 공부하는 컴퓨터구조 + 운영체제
네
미해결
스프링 DB 1편 - 데이터 접근 핵심 원리
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] package hello.jdbc.connection; import lombok.extern.slf4j.Slf4j; import org.junit.jupiter.api.Test; import org.springframework.jdbc.datasource.DriverManagerDataSource; import javax.sql.DataSource; import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; import static hello.jdbc.connection.ConnectionConst.*; @Slf4j public class ConnectionTest { @Test void driverManager() throws SQLException { Connection con1 = DriverManager.getConnection(URL, USERNAME, PASSWORD); Connection con2 = DriverManager.getConnection(URL, USERNAME, PASSWORD); log.info("connection={}, class={}", con1, con1.getClass()); log.info("connection={}, class={}", con2, con2.getClass()); } @Test void dataSourceDriverManager() throws SQLException { //DriverManagerDataSource - 항상 새로운 커넥션 획득 DriverManagerDataSource dataSource = new DriverManagerDataSource(URL, USERNAME, PASSWORD); useDataSource(dataSource); } private void useDataSource(DataSource dataSource) throws SQLException { Connection con1 = dataSource.getConnection(); Connection con2 = dataSource.getConnection(); log.info("connection={}, class={}", con1, con1.getClass()); log.info("connection={}, class={}", con2, con2.getClass()); } } 실행결과 21:19:15.821 [main] INFO hello.jdbc.connection.ConnectionTest -- connection=conn2: url=jdbc:h2:tcp:// localhost/~/test user=SA, class=class org.h2.jdbc.JdbcConnection 21:19:15.821 [main] INFO hello.jdbc.connection.ConnectionTest -- connection=conn3: url=jdbc:h2:tcp:// localhost/~/test user=SA, class=class org.h2.jdbc.JdbcConnection (질문)밑에 내용이 나오지 않은데 왜 그런지 알 수 있을까요? DriverManagerDataSource - Creating new JDBC DriverManager Connection to [jdbc:h2:tcp:..test] DriverManagerDataSource - Creating new JDBC DriverManager Connection to [jdbc:h2:tcp:..test]
미해결
재고시스템으로 알아보는 동시성이슈 해결방법
그냥 궁금해서 redis-cli에서 "subscribe 1" 을 하고 Redisson 실습 시 락에 대한 메시지가 날아오는 지 궁금해서 해봤더니 아무 내용도 안 오네여? 아예 상관 없는 내용인가여 ㅋㅋㅋ..
미해결
10주완성 C++ 코딩테스트 | 알고리즘 코딩테스트
http://boj.kr/f1072a98c98a404992c7700849705b0c 강의 듣기 전 작성해본 코드입니다. 위치랑 시간 업데이트 for문으로 상하좌우 탐색 이 때 push 시 시간도 같이 저장 시간이 바뀌면 불 업데이트 1~3번 반복 하는 도중 탈출 성공하면 return 코드 시행 시 메모리 초과가 나오는데 어디에서 초과가 되는지 모르겠습니다. 제 생각에는 아마 while 안의 push 부분에서 일어나는 것 같은데 pop을 해주는데도 메모리 초과가 일어날 수 있나요?
미해결
Practical Testing: 실용적인 테스트 가이드
학습 관련 질문을 남겨주세요. 어떤 부분이 고민인지, 무엇이 문제인지 상세히 작성하면 더 좋아요! 먼저 유사한 질문이 있었는지 검색해 보세요. 서로 예의를 지키며 존중하는 문화를 만들어가요. 안녕하세요. 강의를 열심히 보고 있는 수강자입니다. 다름이 아니라 이번 강의를 보면서 궁금한 점이 있는데요! LocalDateTime을 인자값으로 전달받아 단위테스트하기 좋게 리팩토링하셨는데, 나중에 createOrder를 호출하는 객체의 통합테스트 를 진행할때는 시간에 대한 테스트코드를 어떻게 처리하는지 궁금합니다. 예를 들어 CafeKioskRunner에서 main 메서드를 통합 테스트한다고 했을 때 시간에 따라 createOrder에서 성공 또는 exception이 발생할 것 같아서 이것에 대한 통합테스트를 어떻게 처리하는지 궁금합니다. 감사합니다.
미해결
안녕하세요. 우분투로 Vue cli 설치하고 vue create 명령어로 뷰 프로젝트를 만드려고 하는데 자꾸 사진과 같은 오류가 뜨는데 이유를 모르겠어요...ㅠㅠ
미해결
안녕하세요 Github.com/matbi86/sulgyedokhak 으로 접속하면 404가 뜨며 접속이 되지 않아 여쭤봅니다 만일 권한이 필요한 거면 Github 허가 부탁드립니다 Github 아이디 : redstar125@naver.com Github 이름 : henrynam 인프런 아이디 : redstar125@naver.com 인프런 닉네임 : redstar125
해결됨
개발자를 위한 컴퓨터공학 1: 혼자 공부하는 컴퓨터구조 + 운영체제
없는데 어떻게 5번지에 자동으로 가나요?
미해결
실전! 스프링 부트와 JPA 활용1 - 웹 애플리케이션 개발
회원 기능 테스트 강의 08:50분에 실행하는 테스트 실행하다 제목과 같은 오류가 발생했습니다ㅠㅠ 커뮤니티에 찾아봐도 몰라서 질문 드립니다. 꼭 좀 도와주시면 감사하겠습니다. MemberRepository 입니다. MemberServiceTest입니다. MemberRepository입니다. 아래는 오류 문입니다 antlr.NoViableAltException: unexpected AST node: . at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.logicalExpr( HqlSqlBaseWalker.java:2188 ) ~[ hibernate-core-5.6.15.Final .jar: 5.6.15.Final ] at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.whereClause( HqlSqlBaseWalker.java:841 ) ~[ hibernate-core-5.6.15.Final .jar: 5.6.15.Final ] at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query( HqlSqlBaseWalker.java:635 ) ~[ hibernate-core-5.6.15.Final .jar: 5.6.15.Final ] at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement( HqlSqlBaseWalker.java:339 ) ~[ hibernate-core-5.6.15.Final .jar: 5.6.15.Final ] at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement( HqlSqlBaseWalker.java:287 ) ~[ hibernate-core-5.6.15.Final .jar: 5.6.15.Final ] at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze( QueryTranslatorImpl.java:276 ) ~[ hibernate-core-5.6.15.Final .jar: 5.6.15.Final ] at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile( QueryTranslatorImpl.java:192 ) ~[ hibernate-core-5.6.15.Final .jar: 5.6.15.Final ] at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile( QueryTranslatorImpl.java:144 ) ~[ hibernate-core-5.6.15.Final .jar: 5.6.15.Final ] at org.hibernate.engine.query.spi.HQLQueryPlan.<init>( HQLQueryPlan.java:112 ) ~[ hibernate-core-5.6.15.Final .jar: 5.6.15.Final ] at org.hibernate.engine.query.spi.HQLQueryPlan.<init>( HQLQueryPlan.java:73 ) ~[ hibernate-core-5.6.15.Final .jar: 5.6.15.Final ] at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan( QueryPlanCache.java:162 ) ~[ hibernate-core-5.6.15.Final .jar: 5.6.15.Final ] at org.hibernate.internal.AbstractSharedSessionContract.getQueryPlan( AbstractSharedSessionContract.java:636 ) ~[ hibernate-core-5.6.15.Final .jar: 5.6.15.Final ] at org.hibernate.internal.AbstractSharedSessionContract.createQuery( AbstractSharedSessionContract.java:748 ) ~[ hibernate-core-5.6.15.Final .jar: 5.6.15.Final ] at org.hibernate.internal.AbstractSharedSessionContract.createQuery( AbstractSharedSessionContract.java:848 ) ~[ hibernate-core-5.6.15.Final .jar: 5.6.15.Final ] at org.hibernate.internal.AbstractSharedSessionContract.createQuery( AbstractSharedSessionContract.java:114 ) ~[ hibernate-core-5.6.15.Final .jar: 5.6.15.Final ] 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.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke( SharedEntityManagerCreator.java:315 ) ~[spring-orm-5.3.26.jar:5.3.26] at com.sun.proxy.$Proxy123.createQuery(Unknown Source) ~[na:na] at jpabook.jpashop.member.MemberRepository.findByName( MemberRepository.java:38 ) ~[main/:na] at jpabook.jpashop.member.MemberRepository$$FastClassBySpringCGLIB$$cf542431.invoke(<generated>) ~[main/:na] at org.springframework.cglib.proxy.MethodProxy.invoke( MethodProxy.java:218 ) ~[spring-core-5.3.26.jar:5.3.26] at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint( CglibAopProxy.java:793 ) ~[spring-aop-5.3.26.jar:5.3.26] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed( ReflectiveMethodInvocation.java:163 ) ~[spring-aop-5.3.26.jar:5.3.26] at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed( CglibAopProxy.java:763 ) ~[spring-aop-5.3.26.jar:5.3.26] at org.springframework.dao.support .PersistenceExceptionTranslationInterceptor.invoke( PersistenceExceptionTranslationInterceptor.java:137 ) ~[spring-tx-5.3.26.jar:5.3.26] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed( ReflectiveMethodInvocation.java:186 ) ~[spring-aop-5.3.26.jar:5.3.26] at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed( CglibAopProxy.java:763 ) ~[spring-aop-5.3.26.jar:5.3.26] at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept( CglibAopProxy.java:708 ) ~[spring-aop-5.3.26.jar:5.3.26] at jpabook.jpashop.member.MemberRepository$$EnhancerBySpringCGLIB$$22198719.findByName(<generated>) ~[main/:na] at jpabook.jpashop.service.MemberService.validateDUplicateMember( MemberService.java:44 ) ~[main/:na] at jpabook.jpashop.service.MemberService.join( MemberService.java:33 ) ~[main/:na] at jpabook.jpashop.service.MemberService$$FastClassBySpringCGLIB$$560b731b.invoke(<generated>) ~[main/:na] at org.springframework.cglib.proxy.MethodProxy.invoke( MethodProxy.java:218 ) ~[spring-core-5.3.26.jar:5.3.26] at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint( CglibAopProxy.java:793 ) ~[spring-aop-5.3.26.jar:5.3.26] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed( ReflectiveMethodInvocation.java:163 ) ~[spring-aop-5.3.26.jar:5.3.26] at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed( CglibAopProxy.java:763 ) ~[spring-aop-5.3.26.jar:5.3.26] at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation( TransactionInterceptor.java:123 ) ~[spring-tx-5.3.26.jar:5.3.26] at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction( TransactionAspectSupport.java:388 ) ~[spring-tx-5.3.26.jar:5.3.26] at org.springframework.transaction.interceptor.TransactionInterceptor.invoke( TransactionInterceptor.java:119 ) ~[spring-tx-5.3.26.jar:5.3.26] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed( ReflectiveMethodInvocation.java:186 ) ~[spring-aop-5.3.26.jar:5.3.26] at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed( CglibAopProxy.java:763 ) ~[spring-aop-5.3.26.jar:5.3.26] at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept( CglibAopProxy.java:708 ) ~[spring-aop-5.3.26.jar:5.3.26] at jpabook.jpashop.service.MemberService$$EnhancerBySpringCGLIB$$1f95cebf.join(<generated>) ~[main/:na] at jpabook.jpashop.service.MemberServiceTest.MemberSign( MemberServiceTest.java:31 ) ~[test/: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.junit.runners.model.FrameworkMethod$1.runReflectiveCall( FrameworkMethod.java:59 ) ~[junit-4.13.1.jar:4.13.1] at org.junit.internal.runners.model.ReflectiveCallable.run ( ReflectiveCallable.java:12 ) ~[junit-4.13.1.jar:4.13.1] at org.junit.runners.model.FrameworkMethod.invokeExplosively( FrameworkMethod.java:56 ) ~[junit-4.13.1.jar:4.13.1] at org.junit.internal.runners.statements.InvokeMethod.evaluate( InvokeMethod.java:17 ) ~[junit-4.13.1.jar:4.13.1] at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate( RunBeforeTestExecutionCallbacks.java:74 ) ~[spring-test-5.3.26.jar:5.3.26] at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate( RunAfterTestExecutionCallbacks.java:84 ) ~[spring-test-5.3.26.jar:5.3.26] at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate( RunBeforeTestMethodCallbacks.java:75 ) ~[spring-test-5.3.26.jar:5.3.26] at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate( RunAfterTestMethodCallbacks.java:86 ) ~[spring-test-5.3.26.jar:5.3.26] at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate( SpringRepeat.java:84 ) ~[spring-test-5.3.26.jar:5.3.26] at org.junit.runners.ParentRunner.runLeaf( ParentRunner.java:366 ) ~[junit-4.13.1.jar:4.13.1] at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild( SpringJUnit4ClassRunner.java:251 ) ~[spring-test-5.3.26.jar:5.3.26] at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild( SpringJUnit4ClassRunner.java:97 ) ~[spring-test-5.3.26.jar:5.3.26] at org.junit.runners.ParentRunner$4.run( ParentRunner.java:331 ) ~[junit-4.13.1.jar:4.13.1] at org.junit.runners.ParentRunner$1.schedule( ParentRunner.java:79 ) ~[junit-4.13.1.jar:4.13.1] at org.junit.runners.ParentRunner.runChildren( ParentRunner.java:329 ) ~[junit-4.13.1.jar:4.13.1] at org.junit.runners.ParentRunner.access$100( ParentRunner.java:66 ) ~[junit-4.13.1.jar:4.13.1] at org.junit.runners.ParentRunner$2.evaluate( ParentRunner.java:293 ) ~[junit-4.13.1.jar:4.13.1] at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate( RunBeforeTestClassCallbacks.java:61 ) ~[spring-test-5.3.26.jar:5.3.26] at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate( RunAfterTestClassCallbacks.java:70 ) ~[spring-test-5.3.26.jar:5.3.26] at org.junit.runners.ParentRunner$3.evaluate( ParentRunner.java:306 ) ~[junit-4.13.1.jar:4.13.1] at org.junit.runners.ParentRunner.run ( ParentRunner.java:413 ) ~[junit-4.13.1.jar:4.13.1] at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run ( SpringJUnit4ClassRunner.java:190 ) ~[spring-test-5.3.26.jar:5.3.26] at org.junit.runner.JUnitCore.run ( JUnitCore.java:137 ) ~[junit-4.13.1.jar:4.13.1] at org.junit.runner.JUnitCore.run ( JUnitCore.java:115 ) ~[junit-4.13.1.jar:4.13.1] at org.junit.vintage.engine.execution.RunnerExecutor.execute( RunnerExecutor.java:42 ) ~[junit-vintage-engine-5.8.2.jar:5.8.2] at org.junit.vintage.engine.VintageTestEngine.executeAllChildren( VintageTestEngine.java:80 ) ~[junit-vintage-engine-5.8.2.jar:5.8.2] at org.junit.vintage.engine.VintageTestEngine.execute( VintageTestEngine.java:72 ) ~[junit-vintage-engine-5.8.2.jar:5.8.2] at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute( EngineExecutionOrchestrator.java:107 ) ~[na:na] at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute( EngineExecutionOrchestrator.java:88 ) ~[na:na] at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0( EngineExecutionOrchestrator.java:54 ) ~[na:na] at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams( EngineExecutionOrchestrator.java:67 ) ~[na:na] at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute( EngineExecutionOrchestrator.java:52 ) ~[na:na] at org.junit.platform.launcher.core.DefaultLauncher.execute( DefaultLauncher.java:114 ) ~[na:na] at org.junit.platform.launcher.core.DefaultLauncher.execute( DefaultLauncher.java:86 ) ~[na:na] at org.junit.platform.launcher.core.DefaultLauncherSession$DelegatingLauncher.execute( DefaultLauncherSession.java:86 ) ~[na:na] at org.junit.platform.launcher.core.SessionPerRequestLauncher.execute( SessionPerRequestLauncher.java:53 ) ~[na:na] at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.processAllTestClasses( JUnitPlatformTestClassProcessor.java:99 ) ~[na:na] at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.access$000( JUnitPlatformTestClassProcessor.java:79 ) ~[na:na] at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor.stop( JUnitPlatformTestClassProcessor.java:75 ) ~[na:na] at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.stop( SuiteTestClassProcessor.java:62 ) ~[na:na] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke( NativeMethodAccessorImpl.java:62 ) ~[na:na] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke( DelegatingMethodAccessorImpl.java:43 ) ~[na:na] at java.base/java.lang.reflect.Method.invoke( Method.java:566 ) ~[na:na] at org.gradle.internal.dispatch.ReflectionDispatch.dispatch( ReflectionDispatch.java:36 ) ~[na:na] at org.gradle.internal.dispatch.ReflectionDispatch.dispatch( ReflectionDispatch.java:24 ) ~[na:na] at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch( ContextClassLoaderDispatch.java:33 ) ~[na:na] at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke( ProxyDispatchAdapter.java:94 ) ~[na:na] at com.sun.proxy.$Proxy2.stop(Unknown Source) ~[na:na] at org.gradle.api.internal.tasks.testing.worker.TestWorker$3.run( TestWorker.java:193 ) ~[na:na] at org.gradle.api.internal.tasks.testing.worker.TestWorker.executeAndMaintainThreadName( TestWorker.java:129 ) ~[na:na] at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute( TestWorker.java:100 ) ~[na:na] at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute( TestWorker.java:60 ) ~[na:na] at org.gradle.process.internal.worker.child.ActionExecutionWorker.execute( ActionExecutionWorker.java:56 ) ~[na:na] at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call ( SystemApplicationClassLoaderWorker.java:113 ) ~[na:na] at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call ( SystemApplicationClassLoaderWorker.java:65 ) ~[na:na] at worker.org.gradle.process.internal.worker.GradleWorkerMain.run ( GradleWorkerMain.java:69 ) ~[gradle-worker.jar:na] at worker.org .gradle.process.internal.worker.GradleWorkerMain.main( GradleWorkerMain.java:74 ) ~[gradle-worker.jar:na] 2023-06-25 19:33:44.563 INFO 23436 --- [ Test worker] p6spy : #1687689224563 | took 0ms | rollback | connection 4| url jdbc:h2:mem:fa852fc9-f2a7-4111-a7ca-8aefa01f2a24 ; 2023-06-25 19:33:44.569 INFO 23436 --- [ Test worker] o.s.t.c.transaction.TransactionContext : Rolled back transaction for test: [DefaultTestContext@15515c51 testClass = MemberServiceTest, testInstance = jpabook.jpashop.service.MemberServiceTest@363ee411, testMethod = MemberSign@MemberServiceTest, testException = org.springframework.dao.InvalidDataAccessApiUsageException: org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected AST node: . near line 1, column 54 [select m from jpabook.jpashop.domain.Member m where m.name ]; nested exception is java.lang.IllegalArgumentException: org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected AST node: . near line 1, column 54 [select m from jpabook.jpashop.domain.Member m where m.name ], mergedContextConfiguration = [WebMergedContextConfiguration@36a7abe1 testClass = MemberServiceTest, locations = '{}', classes = '{class jpabook.jpashop.JpashopApplication}', contextInitializerClasses = '[]', activeProfiles = '{}', propertySourceLocations = '{}', propertySourceProperties = '{org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true}', contextCustomizers = set[org.springframework.boot.test.autoconfigure.actuate.metrics.MetricsExportContextCustomizerFactory$DisableMetricExportContextCustomizer@463b4ac8, org.springframework.boot.test.autoconfigure.properties .PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizerFactory$Customizer@66b7550d, org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@4212a0c8, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@476b0ae6, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@488eb7f2, org.springframework.boot.test.context.SpringBootTestArgs@1, org.springframework.boot.test.context.SpringBootTestWebEnvironment@294e5088], resourceBasePath = 'src/main/webapp', contextLoader = 'org.springframework.boot.test.context.SpringBootContextLoader', parent = [null]], attributes = map['org.springframework.test.context.web.ServletTestExecutionListener.activateListener' -> true, 'org.springframework.test.context.web.ServletTestExecutionListener.populatedRequestContextHolder' -> true, 'org.springframework.test.context.web.ServletTestExecutionListener.resetRequestContextHolder' -> true, 'org.springframework.test.context.event.ApplicationEventsTestExecutionListener.recordApplicationEvents' -> false]] org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected AST node: . near line 1, column 54 [select m from jpabook.jpashop.domain.Member m where m.name ]; nested exception is java.lang.IllegalArgumentException: org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected AST node: . near line 1, column 54 [select m from jpabook.jpashop.domain.Member m where m.name ] org.springframework.dao.InvalidDataAccessApiUsageException: org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected AST node: . near line 1, column 54 [select m from jpabook.jpashop.domain.Member m where m.name ]; nested exception is java.lang.IllegalArgumentException: org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected AST node: . near line 1, column 54 [select m from jpabook.jpashop.domain.Member m where m.name ] at app//org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible( EntityManagerFactoryUtils.java:374 ) at app//org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible( HibernateJpaDialect.java:235 ) at app//org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible( AbstractEntityManagerFactoryBean.java:551 ) at app//org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible( ChainedPersistenceExceptionTranslator.java:61 ) at app//org.springframework.dao.support.DataAccessUtils.translateIfNecessary( DataAccessUtils.java:242 ) at app//org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke( PersistenceExceptionTranslationInterceptor.java:152 ) at app//org.springframework.aop.framework.ReflectiveMethodInvocation.proceed( ReflectiveMethodInvocation.java:186 ) at app//org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed( CglibAopProxy.java:763 ) at app//org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept( CglibAopProxy.java:708 ) at app//jpabook.jpashop.member.MemberRepository$$EnhancerBySpringCGLIB$$22198719.findByName(<generated>) at app//jpabook.jpashop.service.MemberService.validateDUplicateMember( MemberService.java:44 ) at app//jpabook.jpashop.service.MemberService.join( MemberService.java:33 ) at app//jpabook.jpashop.service.MemberService$$FastClassBySpringCGLIB$$560b731b.invoke(<generated>) at app//org.springframework.cglib.proxy.MethodProxy.invoke( MethodProxy.java:218 ) at app//org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint( CglibAopProxy.java:793 ) at app//org.springframework.aop.framework.ReflectiveMethodInvocation.proceed( ReflectiveMethodInvocation.java:163 ) at app//org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed( CglibAopProxy.java:763 ) at app//org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation( TransactionInterceptor.java:123 ) at app//org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction( TransactionAspectSupport.java:388 ) at app//org.springframework.transaction.interceptor.TransactionInterceptor.invoke( TransactionInterceptor.java:119 ) at app//org.springframework.aop.framework.ReflectiveMethodInvocation.proceed( ReflectiveMethodInvocation.java:186 ) at app//org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed( CglibAopProxy.java:763 ) at app//org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept( CglibAopProxy.java:708 ) at app//jpabook.jpashop.service.MemberService$$EnhancerBySpringCGLIB$$1f95cebf.join(<generated>) at app//jpabook.jpashop.service.MemberServiceTest.MemberSign( MemberServiceTest.java:31 ) at java.base@11/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base@11/jdk.internal.reflect.NativeMethodAccessorImpl.invoke( NativeMethodAccessorImpl.java:62 ) at java.base@11/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke( DelegatingMethodAccessorImpl.java:43 ) at java.base@11/java.lang.reflect.Method.invoke( Method.java:566 ) at app//org.junit.runners.model.FrameworkMethod$1.runReflectiveCall( FrameworkMethod.java:59 ) at app//org.junit.internal.runners.model.ReflectiveCallable.run( ReflectiveCallable.java:12 ) at app//org.junit.runners.model.FrameworkMethod.invokeExplosively( FrameworkMethod.java:56 ) at app//org.junit.internal.runners.statements.InvokeMethod.evaluate( InvokeMethod.java:17 ) at app//org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate( RunBeforeTestExecutionCallbacks.java:74 ) at app//org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate( RunAfterTestExecutionCallbacks.java:84 ) at app//org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate( RunBeforeTestMethodCallbacks.java:75 ) at app//org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate( RunAfterTestMethodCallbacks.java:86 ) at app//org.springframework.test.context.junit4.statements.SpringRepeat.evaluate( SpringRepeat.java:84 ) at app//org.junit.runners.ParentRunner.runLeaf( ParentRunner.java:366 ) at app//org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild( SpringJUnit4ClassRunner.java:251 ) at app//org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild( SpringJUnit4ClassRunner.java:97 ) at app//org.junit.runners.ParentRunner$4.run( ParentRunner.java:331 ) at app//org.junit.runners.ParentRunner$1.schedule( ParentRunner.java:79 ) at app//org.junit.runners.ParentRunner.runChildren( ParentRunner.java:329 ) at app//org.junit.runners.ParentRunner.access$100( ParentRunner.java:66 ) at app//org.junit.runners.ParentRunner$2.evaluate( ParentRunner.java:293 ) at app//org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate( RunBeforeTestClassCallbacks.java:61 ) at app//org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate( RunAfterTestClassCallbacks.java:70 ) at app//org.junit.runners.ParentRunner$3.evaluate( ParentRunner.java:306 ) at app//org.junit.runners.ParentRunner.run( ParentRunner.java:413 ) at app//org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run( SpringJUnit4ClassRunner.java:190 ) at app//org.junit.runner.JUnitCore.run( JUnitCore.java:137 ) at app//org.junit.runner.JUnitCore.run( JUnitCore.java:115 ) at app//org.junit.vintage.engine.execution.RunnerExecutor.execute( RunnerExecutor.java:42 ) at app//org.junit.vintage.engine.VintageTestEngine.executeAllChildren( VintageTestEngine.java:80 ) at app//org.junit.vintage.engine.VintageTestEngine.execute( VintageTestEngine.java:72 ) at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute( EngineExecutionOrchestrator.java:107 ) at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute( EngineExecutionOrchestrator.java:88 ) at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0( EngineExecutionOrchestrator.java:54 ) at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams( EngineExecutionOrchestrator.java:67 ) at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute( EngineExecutionOrchestrator.java:52 ) at org.junit.platform.launcher.core.DefaultLauncher.execute( DefaultLauncher.java:114 ) at org.junit.platform.launcher.core.DefaultLauncher.execute( DefaultLauncher.java:86 ) at org.junit.platform.launcher.core.DefaultLauncherSession$DelegatingLauncher.execute( DefaultLauncherSession.java:86 ) at org.junit.platform.launcher.core.SessionPerRequestLauncher.execute( SessionPerRequestLauncher.java:53 ) at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.processAllTestClasses( JUnitPlatformTestClassProcessor.java:99 ) at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.access$000( JUnitPlatformTestClassProcessor.java:79 ) at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor.stop( JUnitPlatformTestClassProcessor.java:75 ) at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.stop( SuiteTestClassProcessor.java:62 ) at java.base@11/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base@11/jdk.internal.reflect.NativeMethodAccessorImpl.invoke( NativeMethodAccessorImpl.java:62 ) at java.base@11/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke( DelegatingMethodAccessorImpl.java:43 ) at java.base@11/java.lang.reflect.Method.invoke( Method.java:566 ) at org.gradle.internal.dispatch.ReflectionDispatch.dispatch( ReflectionDispatch.java:36 ) at org.gradle.internal.dispatch.ReflectionDispatch.dispatch( ReflectionDispatch.java:24 ) at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch( ContextClassLoaderDispatch.java:33 ) at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke( ProxyDispatchAdapter.java:94 ) at com.sun.proxy.$Proxy2.stop(Unknown Source) at org.gradle.api.internal.tasks.testing.worker.TestWorker$3.run( TestWorker.java:193 ) at org.gradle.api.internal.tasks.testing.worker.TestWorker.executeAndMaintainThreadName( TestWorker.java:129 ) at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute( TestWorker.java:100 ) at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute( TestWorker.java:60 ) at org.gradle.process.internal.worker.child.ActionExecutionWorker.execute( ActionExecutionWorker.java:56 ) at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call ( SystemApplicationClassLoaderWorker.java:113 ) at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call ( SystemApplicationClassLoaderWorker.java:65 ) at app//worker.org.gradle.process.internal.worker.GradleWorkerMain.run( GradleWorkerMain.java:69 ) at app//worker.org.gradle.process.internal.worker.GradleWorkerMain.main( GradleWorkerMain.java:74 ) Caused by: java.lang.IllegalArgumentException: org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected AST node: . near line 1, column 54 [select m from jpabook.jpashop.domain.Member m where m.name ] at org.hibernate.internal.ExceptionConverterImpl.convert( ExceptionConverterImpl.java:138 ) at org.hibernate.internal.ExceptionConverterImpl.convert( ExceptionConverterImpl.java:181 ) at org.hibernate.internal.ExceptionConverterImpl.convert( ExceptionConverterImpl.java:188 ) at org.hibernate.internal.AbstractSharedSessionContract.createQuery( AbstractSharedSessionContract.java:757 ) at org.hibernate.internal.AbstractSharedSessionContract.createQuery( AbstractSharedSessionContract.java:848 ) at org.hibernate.internal.AbstractSharedSessionContract.createQuery( AbstractSharedSessionContract.java:114 ) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke( NativeMethodAccessorImpl.java:62 ) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke( DelegatingMethodAccessorImpl.java:43 ) at java.base/java.lang.reflect.Method.invoke( Method.java:566 ) at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke( SharedEntityManagerCreator.java:315 ) at com.sun.proxy.$Proxy123.createQuery(Unknown Source) at jpabook.jpashop.member.MemberRepository.findByName( MemberRepository.java:38 ) at jpabook.jpashop.member.MemberRepository$$FastClassBySpringCGLIB$$cf542431.invoke(<generated>) at org.springframework.cglib.proxy.MethodProxy.invoke( MethodProxy.java:218 ) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint( CglibAopProxy.java:793 ) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed( ReflectiveMethodInvocation.java:163 ) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed( CglibAopProxy.java:763 ) at org.springframework.dao.support .PersistenceExceptionTranslationInterceptor.invoke( PersistenceExceptionTranslationInterceptor.java:137 ) ... 81 more Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected AST node: . near line 1, column 54 [select m from jpabook.jpashop.domain.Member m where m.name ] at app//org.hibernate.hql.internal.ast.QuerySyntaxException.convert( QuerySyntaxException.java:74 ) at app//org.hibernate.hql.internal.ast.ErrorTracker.throwQueryException( ErrorTracker.java:93 ) at app//org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze( QueryTranslatorImpl.java:282 ) at app//org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile( QueryTranslatorImpl.java:192 ) at app//org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile( QueryTranslatorImpl.java:144 ) at app//org.hibernate.engine.query.spi.HQLQueryPlan.<init>( HQLQueryPlan.java:112 ) at app//org.hibernate.engine.query.spi.HQLQueryPlan.<init>( HQLQueryPlan.java:73 ) at app//org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan( QueryPlanCache.java:162 ) at app//org.hibernate.internal.AbstractSharedSessionContract.getQueryPlan( AbstractSharedSessionContract.java:636 ) at app//org.hibernate.internal.AbstractSharedSessionContract.createQuery( AbstractSharedSessionContract.java:748 ) ... 96 more
미해결
Node.js로 웹 크롤링하기
const puppeteer = require('puppeteer'); const dotenv = require('dotenv'); dotenv.config(); const crawler = async () => { try { const browser = await puppeteer.launch({ headless: false, args: ['--window-size=1920,1080', '--disable-notifications'] }); const page = await browser.newPage(); await page.setViewport({ width: 1080, height: 1080, }); await page.goto('https://search.naver.com/search.naver?where=nexearch&sm=top_hty&fbm=0&ie=utf8&query=서울+지게차'); await page.waitFor(3000); await page.evaluate(() => { window.scrollBy(0, 1500); document.querySelector('#loc-main-section-root > section > div > div.api_more_wrap > a').click(); }); await page.waitFor(3000); await page.waitFor(3000); await page.evaluate(() => { document.querySelector('#_pcmap_list_scroll_container > ul > li:nth-child(1) > div.qbGlu > div.ouxiq.icT4K > div > div > span > a > span.hClKF').click(); }); await page.waitFor(3000); await page.evaluate(() => { document.querySelector('#_pcmap_list_scroll_container > ul > li:nth-child(1) > div.qbGlu > div.ouxiq.icT4K > div > div > div > div:nth-child(1) > span.RUjqr > a').click(); }); } catch (e) { console.error(e); } }; crawler(); Error: Evaluation failed: TypeError: Cannot read properties of null (reading 'click') at __puppeteer_evaluation_script__:2:151 at ExecutionContext._evaluateInternal (/Users/youssi/Downloads/nodejs-crawler-master/lecture/node_modules/puppeteer/lib/ExecutionContext.js:122:13) at processTicksAndRejections (node:internal/process/task_queues:96:5) at async ExecutionContext.evaluate (/Users/youssi/Downloads/nodejs-crawler-master/lecture/node_modules/puppeteer/lib/ExecutionContext.js:48:12) at async crawler (/Users/youssi/Downloads/nodejs-crawler-master/lecture/index.js:53:5) -- ASYNC -- at ExecutionContext.<anonymous> (/Users/youssi/Downloads/nodejs-crawler-master/lecture/node_modules/puppeteer/lib/helper.js:111:15) at DOMWorld.evaluate (/Users/youssi/Downloads/nodejs-crawler-master/lecture/node_modules/puppeteer/lib/DOMWorld.js:112:20) -- ASYNC -- at Frame.<anonymous> (/Users/youssi/Downloads/nodejs-crawler-master/lecture/node_modules/puppeteer/lib/helper.js:111:15) at Page.evaluate (/Users/youssi/Downloads/nodejs-crawler-master/lecture/node_modules/puppeteer/lib/Page.js:833:43) at Page.<anonymous> (/Users/youssi/Downloads/nodejs-crawler-master/lecture/node_modules/puppeteer/lib/helper.js:112:23) at crawler (/Users/youssi/Downloads/nodejs-crawler-master/lecture/index.js:53:16) 에러가 납니다. 구글 개발자도구에서 select an element~~~ 누르고 나서야 document.querySelector('#_pcmap_list_scroll_container > ul > li:nth-child(1) > div.qbGlu > div.ouxiq.icT4K > div > div > span > a > span.hClKF').click(); }); 위 소스가 정상적으로 작동을 합니다. 찾아보니 Javascript를 사용하여 브라우저에서 렌더링하는 웹 페이지를 가져오려고 합니다. 즉, Http Request Node를 사용하여 수신하는 초기 응답에 현재 검색 중인 데이터가 포함되지 않습니다. 당신의 데이터는 자바스크립트 안에 로드되어 브라우저에 의해 html에 삽입될 것입니다. 이것과 비슷한 거 같습니다. 크롤링이 안되는 것일까요??
해결됨
[입문자를 위한 UE5] Part1. 언리얼 엔진 블루프린트
강의 잘 듣고 있습니다! 블루프린트에서 Array 타입은 STL의 vector로 동적 배열로 구현이 되고, Set과 Map은 STL의 unordered_set, unordered_map으로 해시 테이블로 구현이 되어있다고 이해했습니다. 그렇다면 궁금한게 STL의 list나 set, map인 연결 리스트, 이진 탐색 트리는 사용하지 못하나요? 못한다면 이유가 뭔지 궁금합니다!
해결됨
스프링 MVC 1편 - 백엔드 웹 개발 핵심 기술
[질문 템플릿] 1. 강의 내용과 관련된 질문인가요? (예 2. 인프런의 질문 게시판과 자주 하는 질문에 없는 내용인가요? (예 3. 질문 잘하기 메뉴얼을 읽어보셨나요? (예 [질문 내용] mv.getModel().put("member",member);에서 mv.getModel()을 해서 model을 불러와 put하는 것까지는 이해가 됩니다. 근데 ("member", member)을 하는 이유를 모르겠습니다. member를 넣어서 map을 넣는건가요? 그리고 제일 이해가 안되는 것이 "member"부분입니다. 이것은 무슨의미인가요?
미해결
프로그래밍 시작하기 : 파이썬 입문 (Inflearn Original)
안녕하세요 강의 자료가 없어서 자료 부탁드립니다. case20plus@gmail.com
미해결
스프링 DB 1편 - 데이터 접근 핵심 원리
DriverManagerDataSource를 사용하면 DriverManager를 통해 직접 DB에 접근해서 Connection을 획득하는 것으로 알고 있습니다. HikariDataSource를 사용하면 ConnectionPool에서 얻어오는 것으로 알고 있습니다. 그리고 미리 ConnectionPool 내부의 DriverManager가 직접 DB에 접근해서 Connection을 획득한 후 ConnectionPool에 보관하는 것이 많나요? 맞다면 DrvierManagerDataSource나 HikariDataSource 모두 DB로부터 Connection을 직접 획득하는 주체는 DriverManager인거고 획득 방식은 동일한 것이 맞나요?
미해결
[백문이불여일타] 데이터 분석을 위한 고급 SQL
안녕하세요,강사님. 질문이 있어 글 남깁니다. 리트코드 문제에서 작성하신 서브쿼리는 Email을 가지고 GROUP BY를 하고 해당 GROUP BY에서 최소값을 가지는 ID를 조회하는 쿼리인데, 그럼 여기서 Email이 중복인지에 대한 조건은 따로 작성할 필요가 없는 것일까요? GROUP BY가 중복은 제외라는 의미도 포함되어 있는걸까요?
미해결
[게임 프로그래머 입문 올인원] C++ & 자료구조/알고리즘 & STL & 게임 수학 & Windows API & 게임 서버
연결 리스트 영상에서 33분 정도 쯤에 GetNode 메소드를 만드는 방법(원리?)를 간략히 설명하던도중 건너뛰기 같은게 됩니다.. 이거 어떻데 해야하나요..
미해결
자바와 스프링 부트로 생애 최초 서버 만들기, 누구나 쉽게 개발부터 배포까지! [서버 개발 올인원 패키지]
BookService 51번째줄 오류 41번째줄 정상, 51번째줄 오류 51번째줄 오류, 62번째줄 오류, 65번째줄 정상 UserRepository. 오류코드 강사님 안녕하세요! 좋은 강의 잘 듣고 있습니다. 강의를 따라하고 있는데 오류가 나서 더 이상 진행이 안돼서요 ㅠㅠ BookService에서 41번째 줄의 orElseThrow 과 65번째줄 orElseThrow는 오류가 안 나는데 51번째의 orElseThrow , 책 반납하는 62번째의 orElseThrow 는 빨간줄이 뜹니다. 그대로 따라한 것 같은데 BookService orElseThrow이 부분에서 왜 계속 오류가 나는지 모르겠습니다... 뭐 때문일까요??
미해결
고수가 되는 파이썬 : 동시성과 병렬성 문법 배우기 Feat. 멀티스레딩 vs 멀티프로세싱 (Inflearn Original)
max_workers 옵션을 사용할때 작업의 개수가 넘어가면 직접설정이 유리하다고 하셨는데요..! 작업의 개수가 넘어간다는 말의 의미가 뭔지 이해가 가지 않습니다 ㅠㅠ 혹시 좀 더 자세하게 설명해주실 수 있을까요?
