npx로 리액트앱 설치 후 바로 실행해보려 했는데 작동이 되지 않는 군요.어떻게 해결하면 좋을까요. 처음부터 막하니 굉장히 당황스럽습니다.

- 학습 관련 질문을 남겨주세요. 상세히 작성하면 더 좋아요! - 먼저 유사한 질문이 있었는지 검색해보세요. - 서로 예의를 지키며 존중하는 문화를 만들어가요. - 잠깐! 인프런 서비스 운영 관련 문의는 1:1 문의하기를 이용해주세요.   안녕하세요! 강의 잘 듣고있습니다. 좋은 강의 제공해주셔서 감사합니다. 해당 내용을 처음 공부해서 좀 어려운 부분이 있는데 강의 내용을 정리하고 복습하기 위해 출처를 남기고 개인 깃허브 블로그에 강의내용을 기록해도 괜찮을까요?

5.3.10.final 버전은 찾을 수 없다고 하는데  6.1.2.Final 버전을 사용해도 될까요?

선생님 7분에서 7분15초 부분에서 diplay(); 메서드 호출부분 질문인데요, static 메서드이면 객체 생성없이 클래스명으로 접근이 가능하다고 가르쳐주셨는데, 그러면 TPC29.display(a); 가 되어야 하는게 아닌가요 ?

판교님, 02: 01에서 특수 문자 vscode extension 을 사용하신 건가요?

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]   강사님이 test 실행하면 main이 실행된다고 말씀하셨는데 저는 test worker가 동작합니다. 어떤 이유 때문인지 모르겠어서 질문 남깁니다!

안녕하세요! 어제 npm run start 관련 오류 올렸던 수강생입니다. 깃허브 주소 첨부하겠습니다 감사합니다ㅠ https://github.com/Sumin-Yu-creator/react-test

안녕하세요 선생님. 먼저 좋은강의 감사해요 다름이 아니라 5번 문제에 관해 질문이 있어 글을 올리게 되었어요. (쓰다보니 너무 길어졌네요 죄송합니다..) 1. 먼저,my_list = [10, 25, 78, 456] total = 0 length = 0 for i in my_list: total += i print(total)   이렇게 코딩을 했을 때는  10 35 113 569 이렇게 4개의 값이 나오는데, print()를 빼고 total 만 하여 엔터를 하면 569 딱 한 값만 나오더라고요.  이유를 할 수 있을까요??   2. 7번 문제의 경우,   x = input() 이렇게 시작하여서 입력한 포켓몬의 결과값만 나올 수 있는 코딩법을 알 수 있을까요?   계속 해봤는데 아직 제 실력으로는 부족한 것 같더라고요.   my_pokemon_hp = { '피카츄': 100, '꼬북이': 90, '파이리': 80, '이상해씨': 140 } x = input('당신의 포켓몬은? : ') for 포켓몬, hp in my_pokemon_hp.items() :        if hp >= 100 :            print(f"가라, {포켓몬}")        else :            print('다시 돌아와')   이렇게 했을 때, '파이리'값을 넣으면,-> 당신의 포켓몬은? : 파이리     가라, 피카츄     가라, 이상해씨.    이렇게 3개가 나오더라고요. 저는 파이리를 넣으면 '다시 돌아와'가 될줄 알았어요.        

input_size = x_seq.size(2)라고 했는데 5일치를 입력으로 하는 거면 input_size = x_seq.size(1)아닌가요?

dynamic_cast가 상속관계에서 무조건 장점만 있는게 아니라고 하시면서 설명을 해주셨는데   타입변환 3 : 포인터에서 원래는 C스타일로 형변환 해주었다면 ItemType에 따라서 static_cast를 해주면 dynamic_cast를 사용하는 것보다 빠르다고 하셨는데   가삼함수 테이블 주소를 찾아서 그 주소에 맞게 형변환을 하는 것보다   사진처럼 if문과같은 코드들이 있는데 이러한 코드들을 거쳐서 static_cast을 하는것이 dynamic_cast보다 동작 방식이 더 빠른 것인가요?   왜 type따라서 미리 분류하여 static_cast를 하는것이 더 빠른가요??  

서버 실행시에 이런 오류가 뜨는 이유가 무엇이며 해결법을 알고싶습니다! export 'default' (imported as 'VueRouter') was not found in 'vue-router' 컴파일 오류인데 왜일까요ㅜㅜ>?? 원인::     package.json ::   vue 버전 ::  

어플리케이션 포트는 0~65535까지라고 하는데, 만약 구글서버에서 동시에 100만명의 접속자가 들어오면 클라이언트별로 포트를 다 할당하나요? 그러면 100만명을 수용 못할거 같은데 어떻게 처리하는지 궁금합니다. 만약 포트는 동일한 포트를 쓰고 app단에서 사용자 처리를 한다면 app에서는 100만명의 주소와 포트를 다 관리하는 것인지요?   감사합니다.

영상 23분 36초에 나오는 MyStatComponent.cpp의 OnAttacked(float DamageAmount) 함수에서 DamageAmount 변수는 따로 10이라고 설정해준 적이 없는데 기능 구현되는 것을 보면 10씩 깎이더라구요.  이건 왜 이렇게 되는지 알 수 있을까요? 

궁금해서 질문드립니다. 전세계에서 사용하는 ip주소가 점점 포화상태에 이르고 있잖아요? 스마트폰, 태블릿도 보급되고 서버도 늘어나고 IoT도 점점 늘어나고 있고,,, 아직까지는 ip주소가 넉넉한지 궁금합니다. 그리고 현시점의 ipv6 보급률? 은 어느정도인지, 궁금합니다. 마지막으로 만약 구형 IoT나 네트워크 장비라서 ipv4밖에 인식을 못하는 장비가 있고 마침 전세계 ipv4가 포화되었다고 가정하면 어떻게 이 장비를 네트웍에 연결시킬수 있는지도 궁금하구요.   감사합니다.

c 가 이렇게 선언 되어있어서, 0번째를 출력하고자 해서 출력하면, KeyError: 0 이라고 뜨네요 그리고 만약 c의 'arr'에서 어떠한 원소를 출력하고자 하면 어떻게 작성해야하나요?

플러터와 <php,DB(mysql)>을 사용하여 로그인&회원가입을 구현했습니다.  로그인을 하면 닉네임을 표시하고 싶은데 DB에서 ID에 해당하는 닉네임 값을 어떻게 가져와야할지 모르겠습니다.  로그인하면 로그인유지는 shared_preferences 사용하여 (id,pw)를 저장했습니다.  

위와 같이 calloc을 이용해서 buf를 선언할 경우 read() fail 문제가 발생하는데, 교수님의 코드와 같이 정적 어레이로 선언하면 코드가 정상적으로 돌아가는 것을 확인했습니다. 혹시 calloc으로 설정하면 안되는 이유가 있는지 여쭤보고 싶습니다. 

먼저 좋은 강좌 감사드립니다. 해당 블로그 접속이 되지 않아요.  확인부탁드립니다.

학습하는 분들께 도움이 되고, 더 좋은 답변을 드릴 수 있도록 질문전에 다음을 꼭 확인해 Consider defining a bean of type 'javax.persistence.EntityManagerFactory' in your configuration. 2022-08-17 10:08:40.790 ERROR 13280 --- [           main] o.s.test.context.TestContextManager      : Caught exception while allowing TestExecutionListener [org.springframework.test.context.web.ServletTestExecutionListener@5be49b60] to prepare test instance [repository.MemberRepositoryTest@19f040ba] java.lang.IllegalStateException: Failed to load ApplicationContext    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:132) ~[spring-test-5.3.22.jar:5.3.22]    at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:124) ~[spring-test-5.3.22.jar:5.3.22]    at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:190) ~[spring-test-5.3.22.jar:5.3.22]    at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:132) ~[spring-test-5.3.22.jar:5.3.22]    at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:248) ~[spring-test-5.3.22.jar:5.3.22]    at org.springframework.test.context.junit.jupiter.SpringExtension.postProcessTestInstance(SpringExtension.java:138) ~[spring-test-5.3.22.jar:5.3.22]    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$8(ClassBasedTestDescriptor.java:363) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.executeAndMaskThrowable(ClassBasedTestDescriptor.java:368) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$9(ClassBasedTestDescriptor.java:363) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]    at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[na:na]    at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179) ~[na:na]    at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625) ~[na:na]    at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[na:na]    at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[na:na]    at java.base/java.util.stream.StreamSpliterators$WrappingSpliterator.forEachRemaining(StreamSpliterators.java:310) ~[na:na]    at java.base/java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:735) ~[na:na]    at java.base/java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:734) ~[na:na]    at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762) ~[na:na]    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.invokeTestInstancePostProcessors(ClassBasedTestDescriptor.java:362) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$instantiateAndPostProcessTestInstance$6(ClassBasedTestDescriptor.java:283) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.instantiateAndPostProcessTestInstance(ClassBasedTestDescriptor.java:282) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$4(ClassBasedTestDescriptor.java:272) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]    at java.base/java.util.Optional.orElseGet(Optional.java:364) ~[na:na]    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$5(ClassBasedTestDescriptor.java:271) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]    at org.junit.jupiter.engine.execution.TestInstancesProvider.getTestInstances(TestInstancesProvider.java:31) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$prepare$0(TestMethodTestDescriptor.java:102) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:101) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:66) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$prepare$2(NodeTestTask.java:123) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.NodeTestTask.prepare(NodeTestTask.java:123) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:90) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at java.base/java.util.ArrayList.forEach(ArrayList.java:1511) ~[na:na]    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at java.base/java.util.ArrayList.forEach(ArrayList.java:1511) ~[na:na]    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:35) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:54) ~[junit-platform-engine-1.8.2.jar:1.8.2]    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:107) ~[junit-platform-launcher-1.8.2.jar:1.8.2]    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88) ~[junit-platform-launcher-1.8.2.jar:1.8.2]    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54) ~[junit-platform-launcher-1.8.2.jar:1.8.2]    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67) ~[junit-platform-launcher-1.8.2.jar:1.8.2]    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52) ~[junit-platform-launcher-1.8.2.jar:1.8.2]    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:114) ~[junit-platform-launcher-1.8.2.jar:1.8.2]    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:86) ~[junit-platform-launcher-1.8.2.jar:1.8.2]    at org.junit.platform.launcher.core.DefaultLauncherSession$DelegatingLauncher.execute(DefaultLauncherSession.java:86) ~[junit-platform-launcher-1.8.2.jar:1.8.2]    at org.junit.platform.launcher.core.SessionPerRequestLauncher.execute(SessionPerRequestLauncher.java:53) ~[junit-platform-launcher-1.8.2.jar:1.8.2]    at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:57) ~[junit5-rt.jar:na]    at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38) ~[junit-rt.jar:na]    at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11) ~[idea_rt.jar:na]    at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35) ~[junit-rt.jar:na]    at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:235) ~[junit-rt.jar:na]    at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54) ~[junit-rt.jar:na]Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'memberRepository': Injection of persistence dependencies failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'javax.persistence.EntityManagerFactory' available    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.postProcessProperties(PersistenceAnnotationBeanPostProcessor.java:351) ~[spring-orm-5.3.22.jar:5.3.22]    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431) ~[spring-beans-5.3.22.jar:5.3.22]    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619) ~[spring-beans-5.3.22.jar:5.3.22]    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.22.jar:5.3.22]    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.22.jar:5.3.22]    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.22.jar:5.3.22]    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.22.jar:5.3.22]    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.22.jar:5.3.22]    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:955) ~[spring-beans-5.3.22.jar:5.3.22]    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918) ~[spring-context-5.3.22.jar:5.3.22]    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.22.jar:5.3.22]    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:734) ~[spring-boot-2.7.2.jar:2.7.2]    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408) ~[spring-boot-2.7.2.jar:2.7.2]    at org.springframework.boot.SpringApplication.run(SpringApplication.java:308) ~[spring-boot-2.7.2.jar:2.7.2]    at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:132) ~[spring-boot-test-2.7.2.jar:2.7.2]    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99) ~[spring-test-5.3.22.jar:5.3.22]    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124) ~[spring-test-5.3.22.jar:5.3.22]    ... 71 common frames omittedCaused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'javax.persistence.EntityManagerFactory' available    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveNamedBean(DefaultListableBeanFactory.java:1221) ~[spring-beans-5.3.22.jar:5.3.22]    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.findDefaultEntityManagerFactory(PersistenceAnnotationBeanPostProcessor.java:565) ~[spring-orm-5.3.22.jar:5.3.22]    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.findEntityManagerFactory(PersistenceAnnotationBeanPostProcessor.java:528) ~[spring-orm-5.3.22.jar:5.3.22]    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor$PersistenceElement.resolveEntityManager(PersistenceAnnotationBeanPostProcessor.java:696) ~[spring-orm-5.3.22.jar:5.3.22]    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor$PersistenceElement.getResourceToInject(PersistenceAnnotationBeanPostProcessor.java:669) ~[spring-orm-5.3.22.jar:5.3.22]    at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:228) ~[spring-beans-5.3.22.jar:5.3.22]    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.3.22.jar:5.3.22]    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.postProcessProperties(PersistenceAnnotationBeanPostProcessor.java:348) ~[spring-orm-5.3.22.jar:5.3.22]    ... 87 common frames omitted java.lang.IllegalStateException: Failed to load ApplicationContext     at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:132)    at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:124)    at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:190)    at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:132)    at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:248)    at org.springframework.test.context.junit.jupiter.SpringExtension.postProcessTestInstance(SpringExtension.java:138)    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$8(ClassBasedTestDescriptor.java:363)    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.executeAndMaskThrowable(ClassBasedTestDescriptor.java:368)    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$9(ClassBasedTestDescriptor.java:363)    at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)    at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179)    at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625)    at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)    at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)    at java.base/java.util.stream.StreamSpliterators$WrappingSpliterator.forEachRemaining(StreamSpliterators.java:310)    at java.base/java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:735)    at java.base/java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:734)    at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762)    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.invokeTestInstancePostProcessors(ClassBasedTestDescriptor.java:362)    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$instantiateAndPostProcessTestInstance$6(ClassBasedTestDescriptor.java:283)    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.instantiateAndPostProcessTestInstance(ClassBasedTestDescriptor.java:282)    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$4(ClassBasedTestDescriptor.java:272)    at java.base/java.util.Optional.orElseGet(Optional.java:364)    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$5(ClassBasedTestDescriptor.java:271)    at org.junit.jupiter.engine.execution.TestInstancesProvider.getTestInstances(TestInstancesProvider.java:31)    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$prepare$0(TestMethodTestDescriptor.java:102)    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:101)    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:66)    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$prepare$2(NodeTestTask.java:123)    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)    at org.junit.platform.engine.support.hierarchical.NodeTestTask.prepare(NodeTestTask.java:123)    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:90)    at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41)    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155)    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)    at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41)    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155)    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:35)    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)    at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:54)    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:107)    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88)    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$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 com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:57)    at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38)    at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11)    at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35)    at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:235)    at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'memberRepository': Injection of persistence dependencies failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'javax.persistence.EntityManagerFactory' available    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.postProcessProperties(PersistenceAnnotationBeanPostProcessor.java:351)    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431)    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619)    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:955)    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:734)    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408)    at org.springframework.boot.SpringApplication.run(SpringApplication.java:308)    at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:132)    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99)    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124)    ... 71 moreCaused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'javax.persistence.EntityManagerFactory' available    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveNamedBean(DefaultListableBeanFactory.java:1221)    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.findDefaultEntityManagerFactory(PersistenceAnnotationBeanPostProcessor.java:565)    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.findEntityManagerFactory(PersistenceAnnotationBeanPostProcessor.java:528)    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor$PersistenceElement.resolveEntityManager(PersistenceAnnotationBeanPostProcessor.java:696)    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor$PersistenceElement.getResourceToInject(PersistenceAnnotationBeanPostProcessor.java:669)    at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:228)    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119)    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.postProcessProperties(PersistenceAnnotationBeanPostProcessor.java:348)    ... 87 more Process finished with exit code -1       에제보고 따라해봤는데 왜 빈을 못찾을까요.?

선생님 안녕하세요   현재 머신러닝강의부터 CNN강의까지 선생님강의를 듣고잇는 열혈팬입니다 ㅎ 선생님강의중에 SQL, spark등도 잇던데, 이에관해서는 아는게 전혀 없어서 조언받고 싶어서 이 사이트에서 질문을 드립니다. 알고싶은것은 각각의SQL, spark의 역할입니다 ㅎ(앞으로 강의 들을 생각이라서....)   1) SQL은 데이터 분석용이고 실제 목표값을 예측할수는 없고 목표값을 예측하기위해서는 머신러닝을 이해해야한다고 이해를 해도 되는지요?   2) spark 은 기업에서실제 빅데이터를 이용할경우 사용하는 도구로서 spark을 활용해서 머신러닝을 구현해야 한다고 이해를 해도 되는지요? (물론 데이터가 적을경우 엑셀파일로 받아서 파이썬으로 머신러닝을 구현하면 되지만...)   3) 데이터분석가로서는 최종목표를 spark등을 이용한 머신러닝을 구축하는것이 최종목표로 잡아도 되는지요?   바쁘시겟지만, 시간나실때 답변부탁드리겟습니다 ㅎ