제공해주신 소스코드로 했는데도 maven에서 jdbc6를 못가져옵니다. 수업이 전혀 안되네요~

MemberRepositorypublic interface MemberRepository extends JpaRepository<Member, Long> { List<Member> findMemberByUsernameAndAgeGreaterThan(String username, int age); ... @Query(value = "select m from Member m left join m.team t", countQuery = "select count(m.username) from Member m") Page<Member> findByAge(int age, Pageable pageable); }  MemberRepositoryTestpackage hello.datajpa.repository; ... @SpringBootTest @Transactional @Rollback(false) class MemberRepositoryTest { @Autowired MemberRepository memberRepository; @Autowired TeamRepository teamRepository; ... @Test public void paging() { for (int i = 1; i <= 5; i++) { Member member = new Member("member" + i, 10); memberRepository.save(member); } int age = 10; PageRequest pageRequest = PageRequest.of(0, 3, Sort.by(Sort.Direction.DESC, "username")); Page<Member> page = memberRepository.findByAge(age, pageRequest); List<Member> content = page.getContent(); long totalElements = page.getTotalElements(); int totalPages = page.getTotalPages(); int currentPage = page.getNumber(); boolean isFirst = page.isFirst(); boolean hasNext = page.hasNext(); assertThat(content.size()).isEqualTo(3); assertThat(totalElements).isEqualTo(5); assertThat(totalPages).isEqualTo(2); assertThat(currentPage).isEqualTo(0); assertThat(isFirst).isTrue(); assertThat(hasNext).isTrue(); } } Memberpackage hello.datajpa.entity; ... @Entity @Getter @Setter @NoArgsConstructor(access = AccessLevel.PROTECTED) @ToString(of = {"id", "username", "age"}) /*@NamedQuery( name = "Member.findByUsername", query = "select m from Member m where m.username = :username" )*/ public class Member { @Id @GeneratedValue @Column(name = "member_id") private Long id; private String username; private int age; @ManyToOne(fetch = LAZY) @JoinColumn(name = "team_id") private Team team; public Member(String username, int age) { this.username = username; this.age = age; } public Member(String username, int age, Team team) { this.username = username; this.age = age; changeTeam(team); } public void changeTeam(Team team) { if (team == null) throw new RuntimeException("Member.changeTeam: team is null"); this.team = team; team.getMembers().add(this); } } 쿼리select m1_0.member_id, m1_0.age, m1_0.team_id, m1_0.username from member m1_0 order by m1_0.username desc offset ? rows fetch first ? rows only select count(m1_0.username) from member m1_0강의와 다르게 left join을 해도 left join 관련 쿼리가 나가지 않는데 뭔가 강의와 다르게 설정된 부분이 있는 걸까요?@SpringBootTest @Transactional @Rollback(false) class MemberRepositoryTest { @Autowired MemberRepository memberRepository; @Autowired TeamRepository teamRepository; ... @Test public void paging() { Team team = new Team("A"); teamRepository.save(team); for (int i = 1; i <= 5; i++) { Member member = new Member("member" + i, 10); member.changeTeam(team); memberRepository.save(member); } int age = 10; PageRequest pageRequest = PageRequest.of(0, 3, Sort.by(Sort.Direction.DESC, "username")); Page<Member> page = memberRepository.findByAge(age, pageRequest); List<Member> content = page.getContent(); assertThat(team).isSameAs(content.get(0).getTeam()); // team == content.get(0).getTeam() ? long totalElements = page.getTotalElements(); int totalPages = page.getTotalPages(); int currentPage = page.getNumber(); boolean isFirst = page.isFirst(); boolean hasNext = page.hasNext(); assertThat(content.size()).isEqualTo(3); assertThat(totalElements).isEqualTo(5); assertThat(totalPages).isEqualTo(2); assertThat(currentPage).isEqualTo(0); assertThat(isFirst).isTrue(); assertThat(hasNext).isTrue(); } } 테스트 코드를 위와 같이 변경했을 때 left join 쿼리나 select 쿼리가 나가지 않고 assertThat(team).isSameAs(content.get(0).getTeam()) 테스트는 통과됩니다.위 코드는 이런 식으로 동작하는게 맞을까요?fetch join이 아니기 때문에 하이버네이트는 일단 member만 가져오는 쿼리를 날리고 레코드를 받아온다.받아온 레코드와 영속성 컨텍스트를 비교한다.받아온 레코드가 영속성 컨텍스트에 엔티티로 존재하므로 영속성 컨텍스트에 있는 엔티티를 반환한다.따라서 조회한 content.get(0) 객체에는 team 필드가 이미 할당 되어 있다.

구조분해가 순서에 의존하는 것 같은데, 이러한 순서에 대한 의존성을 제거할 수는 없는 것인가요?  data class Foo( var a:String, var b:Int, var c:Long, var d:String ) fun main(){ val foo = Foo("hello", 33, 44L, "Bye") //기존 방식 val (a, b, c, d) = foo //원하는 방식 val (c, a) = foo }

안녕하세요현재 7강. 유저 생성 API 개발 의 9분 듣고있습니다.국비 프로젝트에서 dto에 직접 저장을 했던 경험이 있습니다.선생님께서는 dto에 패키지의 UserCreateRequest에 저장하지 않고 domain패키지에 User라는 객체를 따로 만들어서 저장하시더라구요.그렇게 하는 이유를 알려주실 수 있을까요?

안녕하세요 인증이나 인가 예외가 터졌을 때 인증 예외의 경우에는 AuthenticationEntryPoint가 리다이렉트 등의 로직을 수행하고 AccessDeniedException의 경우에는 AccessDeniedHandler가 동작하는 것으로 이해하였습니다. 근데 둘다 결국 예외가 발생했을 때 처리를 하는 역할인데 굳이 하나는 엔트리포인트라는 객체를, 다른 하나는 핸들러 객체를 사용하는지 모르겠습니다. 저는 둘 다 엔트리포인트나 혹은 핸들러라고 할 수 있는 거 아닌가 생각이 들었는데 둘이 무슨 차이가 있는지 잘 모르겠어서요 ㅠㅠ 알려주시면 감사하겠습니다.

정확히는 정말잠깐 순간적으로 목록화면이 뜨는듯 하다가 바로 하얀화면으로 전환됩니다저는 8080포트가 사용중이어서 9090으로 포트를 설정했습니다.8080으로도 바꿔서 해봤지만 증상은 같았습니다8080과9090에 할당된 서버의 상태는 이렇습니다강의는 8강. 유저 조회 API 개발과 테스트까지 수강한 상태입니다

[질문 템플릿]1. 강의 내용과 관련된 질문인가요? (예/아니오)2. 인프런의 질문 게시판과 자주 하는 질문에 없는 내용인가요? (예/아니오)3. 질문 잘하기 메뉴얼을 읽어보셨나요? (예/아니오)[질문 내용]여기에 질문 내용을 남겨주세요. 제가 야생형으로 들어서 실습을 먼저해서 h2를 다운 받았는데 또 받아야 하나요???일단 안받고 햇는데 이렇게 빨간줄이 뜹니다 무엇이 문제일까요 ?>??ㅜㅜㅜ

이렇게 main이 빨간줄이 뜨고 이것도 복붙을 했는데 이렇게 떠요ㅠ

2023-05-27 23:50:24.371 ERROR 20044 --- [nio-8090-exec-2] org.thymeleaf.TemplateEngine : [THYMELEAF][http-nio-8090-exec-2] Exception processing template "home": An error happened during template parsing (template: "class path resource [templates/home.html]") org.thymeleaf.exceptions.TemplateInputException: An error happened during template parsing (template: "class path resource [templates/home.html]") at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parse(AbstractMarkupTemplateParser.java:241) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parseStandalone(AbstractMarkupTemplateParser.java:100) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:666) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:366) ~[thymeleaf-spring5-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:190) ~[thymeleaf-spring5-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1406) ~[spring-webmvc-5.3.27.jar:5.3.27] at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1150) ~[spring-webmvc-5.3.27.jar:5.3.27] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089) ~[spring-webmvc-5.3.27.jar:5.3.27] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:965) ~[spring-webmvc-5.3.27.jar:5.3.27] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.27.jar:5.3.27] at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.27.jar:5.3.27] at javax.servlet.http.HttpServlet.service(HttpServlet.java:529) ~[tomcat-embed-core-9.0.74.jar:4.0.FR] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.27.jar:5.3.27] at javax.servlet.http.HttpServlet.service(HttpServlet.java:623) ~[tomcat-embed-core-9.0.74.jar:4.0.FR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:209) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-9.0.74.jar:9.0.74] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:223) ~[spring-security-web-5.7.8.jar:5.7.8] at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:217) ~[spring-security-web-5.7.8.jar:5.7.8] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214) ~[spring-security-web-5.7.8.jar:5.7.8] at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:186) ~[spring-security-web-5.7.8.jar:5.7.8] at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:354) ~[spring-web-5.3.27.jar:5.3.27] at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:267) ~[spring-web-5.3.27.jar:5.3.27] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.27.jar:5.3.27] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.27.jar:5.3.27] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.27.jar:5.3.27] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.27.jar:5.3.27] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.27.jar:5.3.27] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.27.jar:5.3.27] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:481) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:389) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:926) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1791) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at java.base/java.lang.Thread.run(Thread.java:829) ~[na:na] Caused by: org.attoparser.ParseException: Exception evaluating SpringEL expression: "_csrf.token" (template: "home" - line 5, col 31) at org.attoparser.MarkupParser.parseDocument(MarkupParser.java:393) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.attoparser.MarkupParser.parse(MarkupParser.java:257) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parse(AbstractMarkupTemplateParser.java:230) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] ... 58 common frames omitted Caused by: org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "_csrf.token" (template: "home" - line 5, col 31) at org.thymeleaf.spring5.expression.SPELVariableExpressionEvaluator.evaluate(SPELVariableExpressionEvaluator.java:292) ~[thymeleaf-spring5-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.standard.expression.VariableExpression.executeVariableExpression(VariableExpression.java:166) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.standard.expression.SimpleExpression.executeSimple(SimpleExpression.java:66) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.standard.expression.Expression.execute(Expression.java:109) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.standard.expression.Expression.execute(Expression.java:138) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.standard.processor.AbstractStandardExpressionAttributeTagProcessor.doProcess(AbstractStandardExpressionAttributeTagProcessor.java:144) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.processor.element.AbstractElementTagProcessor.process(AbstractElementTagProcessor.java:95) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.util.ProcessorConfigurationUtils$ElementTagProcessorWrapper.process(ProcessorConfigurationUtils.java:633) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.engine.ProcessorTemplateHandler.handleStandaloneElement(ProcessorTemplateHandler.java:918) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.engine.TemplateHandlerAdapterMarkupHandler.handleStandaloneElementEnd(TemplateHandlerAdapterMarkupHandler.java:260) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler$InlineMarkupAdapterPreProcessorHandler.handleStandaloneElementEnd(InlinedOutputExpressionMarkupHandler.java:256) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.standard.inline.OutputExpressionInlinePreProcessorHandler.handleStandaloneElementEnd(OutputExpressionInlinePreProcessorHandler.java:169) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler.handleStandaloneElementEnd(InlinedOutputExpressionMarkupHandler.java:104) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.attoparser.HtmlElement.handleStandaloneElementEnd(HtmlElement.java:79) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.attoparser.HtmlMarkupHandler.handleStandaloneElementEnd(HtmlMarkupHandler.java:241) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.attoparser.MarkupEventProcessorHandler.handleStandaloneElementEnd(MarkupEventProcessorHandler.java:327) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.attoparser.ParsingElementMarkupUtil.parseStandaloneElement(ParsingElementMarkupUtil.java:96) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.attoparser.MarkupParser.parseBuffer(MarkupParser.java:706) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.attoparser.MarkupParser.parseDocument(MarkupParser.java:301) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE] ... 60 common frames omitted Caused by: org.springframework.expression.spel.SpelEvaluationException: EL1007E: Property or field 'token' cannot be found on null at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:219) ~[spring-expression-5.3.27.jar:5.3.27] at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:106) ~[spring-expression-5.3.27.jar:5.3.27] at org.springframework.expression.spel.ast.PropertyOrFieldReference.access$000(PropertyOrFieldReference.java:53) ~[spring-expression-5.3.27.jar:5.3.27] at org.springframework.expression.spel.ast.PropertyOrFieldReference$AccessorLValue.getValue(PropertyOrFieldReference.java:412) ~[spring-expression-5.3.27.jar:5.3.27] at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:93) ~[spring-expression-5.3.27.jar:5.3.27] at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:114) ~[spring-expression-5.3.27.jar:5.3.27] at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:338) ~[spring-expression-5.3.27.jar:5.3.27] at org.thymeleaf.spring5.expression.SPELVariableExpressionEvaluator.evaluate(SPELVariableExpressionEvaluator.java:265) ~[thymeleaf-spring5-3.0.15.RELEASE.jar:3.0.15.RELEASE] ... 79 common frames omitted 2023-05-27 23:50:24.375 ERROR 20044 --- [nio-8090-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateInputException: An error happened during template parsing (template: "class path resource [templates/home.html]")] with root cause org.springframework.expression.spel.SpelEvaluationException: EL1007E: Property or field 'token' cannot be found on null at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:219) ~[spring-expression-5.3.27.jar:5.3.27] at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:106) ~[spring-expression-5.3.27.jar:5.3.27] at org.springframework.expression.spel.ast.PropertyOrFieldReference.access$000(PropertyOrFieldReference.java:53) ~[spring-expression-5.3.27.jar:5.3.27] at org.springframework.expression.spel.ast.PropertyOrFieldReference$AccessorLValue.getValue(PropertyOrFieldReference.java:412) ~[spring-expression-5.3.27.jar:5.3.27] at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:93) ~[spring-expression-5.3.27.jar:5.3.27] at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:114) ~[spring-expression-5.3.27.jar:5.3.27] at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:338) ~[spring-expression-5.3.27.jar:5.3.27] at org.thymeleaf.spring5.expression.SPELVariableExpressionEvaluator.evaluate(SPELVariableExpressionEvaluator.java:265) ~[thymeleaf-spring5-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.standard.expression.VariableExpression.executeVariableExpression(VariableExpression.java:166) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.standard.expression.SimpleExpression.executeSimple(SimpleExpression.java:66) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.standard.expression.Expression.execute(Expression.java:109) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.standard.expression.Expression.execute(Expression.java:138) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.standard.processor.AbstractStandardExpressionAttributeTagProcessor.doProcess(AbstractStandardExpressionAttributeTagProcessor.java:144) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.processor.element.AbstractElementTagProcessor.process(AbstractElementTagProcessor.java:95) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.util.ProcessorConfigurationUtils$ElementTagProcessorWrapper.process(ProcessorConfigurationUtils.java:633) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.engine.ProcessorTemplateHandler.handleStandaloneElement(ProcessorTemplateHandler.java:918) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.engine.TemplateHandlerAdapterMarkupHandler.handleStandaloneElementEnd(TemplateHandlerAdapterMarkupHandler.java:260) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler$InlineMarkupAdapterPreProcessorHandler.handleStandaloneElementEnd(InlinedOutputExpressionMarkupHandler.java:256) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.standard.inline.OutputExpressionInlinePreProcessorHandler.handleStandaloneElementEnd(OutputExpressionInlinePreProcessorHandler.java:169) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler.handleStandaloneElementEnd(InlinedOutputExpressionMarkupHandler.java:104) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.attoparser.HtmlElement.handleStandaloneElementEnd(HtmlElement.java:79) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.attoparser.HtmlMarkupHandler.handleStandaloneElementEnd(HtmlMarkupHandler.java:241) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.attoparser.MarkupEventProcessorHandler.handleStandaloneElementEnd(MarkupEventProcessorHandler.java:327) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.attoparser.ParsingElementMarkupUtil.parseStandaloneElement(ParsingElementMarkupUtil.java:96) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.attoparser.MarkupParser.parseBuffer(MarkupParser.java:706) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.attoparser.MarkupParser.parseDocument(MarkupParser.java:301) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.attoparser.MarkupParser.parse(MarkupParser.java:257) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parse(AbstractMarkupTemplateParser.java:230) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parseStandalone(AbstractMarkupTemplateParser.java:100) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:666) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072) ~[thymeleaf-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:366) ~[thymeleaf-spring5-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:190) ~[thymeleaf-spring5-3.0.15.RELEASE.jar:3.0.15.RELEASE] at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1406) ~[spring-webmvc-5.3.27.jar:5.3.27] at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1150) ~[spring-webmvc-5.3.27.jar:5.3.27] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089) ~[spring-webmvc-5.3.27.jar:5.3.27] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:965) ~[spring-webmvc-5.3.27.jar:5.3.27] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.27.jar:5.3.27] at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.27.jar:5.3.27] at javax.servlet.http.HttpServlet.service(HttpServlet.java:529) ~[tomcat-embed-core-9.0.74.jar:4.0.FR] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.27.jar:5.3.27] at javax.servlet.http.HttpServlet.service(HttpServlet.java:623) ~[tomcat-embed-core-9.0.74.jar:4.0.FR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:209) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-9.0.74.jar:9.0.74] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:223) ~[spring-security-web-5.7.8.jar:5.7.8] at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:217) ~[spring-security-web-5.7.8.jar:5.7.8] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214) ~[spring-security-web-5.7.8.jar:5.7.8] at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:186) ~[spring-security-web-5.7.8.jar:5.7.8] at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:354) ~[spring-web-5.3.27.jar:5.3.27] at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:267) ~[spring-web-5.3.27.jar:5.3.27] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.27.jar:5.3.27] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.27.jar:5.3.27] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.27.jar:5.3.27] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.27.jar:5.3.27] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.27.jar:5.3.27] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.27.jar:5.3.27] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:481) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:389) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:926) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1791) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.74.jar:9.0.74] at java.base/java.lang.Thread.run(Thread.java:829) ~[na:na]  위와 같은 에러가 계속터집니다..강의 소스와 다른점 을 못찾겠어요...https://github.com/whitewise95/springSecurity마스터 브랜치입니다..EL1007E: Property or field 'token'<meta id="_csrf" name="_csrf" th:content="${_csrf.token}"/> <meta id="_csrf_header" name="_csrf_header" th:content="${_csrf.headerName}"/>위 코드를 제거하면 됩니다...

 안녕하세요,제네릭 클래스(연장 전반전) 5:30 부분에서 궁금한 점이 있어 질문드립니다. CoffeeByUser 클래스의 method로서 ready() 를 정의해주었는데, 이때 출력구문에 들어간 user.name 에 대해 잘 이해가 되지 않아 여쭤봅니다. user는 CoffeeByUser 클래스의 아직 자료형이 정의되지 않은 '변수'인데, 어떻게 User 클래스의 변수인 name과 함께 쓰여서 user.name이 될 수 있는건가요?만약 user.name이 아니라 단순히 user 혹은 name 으로 변경한다면 출력값이 다른 걸까요? 감사합니다.

안녕하세요.home 화면에서 회원가입을 누르면 Members/new 페이지로 넘어가는데 넘어가면서@GetMapping(/members/new) 함수가 호출되는 것으로 이해했습니다.이 함수가 호출이 되면 members/CreateMemberForm 페이지를 리턴하는데 왜 url 에는 계속 memebers/new 가 뜨는지 궁금합니다. members/CreateMemberForm 가 url 에 있어야할 것 같은데 왜 그대로 members/new 인가요?

안녕하세요.수업중 질문사항이있어서 문의드립니다.'5. K번째 큰 수' 강의 중 설명 부분에 대하여 의문점이 들었습니다.문제 설명 부분에 '만약 큰 수부터 만들어진 수가 25 25 23 23 22 20 19......이고 K값이 3이라면 K번째 큰 값은 22입니다.'라는 설명이 있는데, k번째로 큰값은 71로 수정되어야 할것같습니다.

member가 새로 생기면 해당 Team에 있는 List<Member> members에 member를 값을 넣어주는 연관관계 편의 메서드가 있다고 할 때, team.getMembers()를 하면 원래는 db에서 join을 한 뒤 해당하는 팀의 멤버들이 리스트에 담겨 반환되는거 같은데, 직접 리스트에 멤버들을 넣어주어서 이미 리스트에 멤버들이 있을텐데 이것들을 반환해주는건가요?질문1. 연관관계 편의 메서드가 없었다면 db가 join을 해서 해당하는 team의 멤버들을 리스트에 담아서 반환해주는 것이 맞나요?질문2. 연관관계 편의 메서드로 내가 해당 team 리스트에 멤버들을 넣어주었으면 db에 갈 필요 없이 넣어준 것들을 그대로 반환하는 건가요?질문3. 그렇다면 db에 들어갈지 안들어가고 리스트에 담아놓은 것들을 반환할지는 jpa가 어떻게 판단하나요? 

[질문 템플릿]1. 강의 내용과 관련된 질문인가요? 예2. 인프런의 질문 게시판과 자주 하는 질문에 없는 내용인가요? 예3. 질문 잘하기 메뉴얼을 읽어보셨나요? 예[질문 내용]./gradlew clean build를 했을 때 아래와 같은 에러가 발생합니다.구글 드라이브 링크: https://drive.google.com/file/d/1noPIwH5K_JrQ_st4-VSuOOqVLuLBopJw/view?usp=sharing$ ./gradlew clean build FAILURE: Build failed with an exception. * What went wrong: A problem occurred configuring root project 'jpashop'. > Could not resolve all files for configuration ':classpath'. > Could not resolve org.springframework.boot:spring-boot-gradle-plugin:3.1.0. Required by: project : > org.springframework.boot:org.springframework.boot.gradle.plugin:3.1.0 > No matching variant of org.springframework.boot:spring-boot-gradle-plugin:3.1.0 was found. The consumer was configured to find a runtime of a library compatible with Java 11, packaged as a jar, and its dependencies declared externally, as well as attribute 'org.gradle.plugin.api-version' with value '7.6.1' but: - Variant 'apiElements' capability org.springframework.boot:spring-boot-gradle-plugin:3.1.0 declares a library, packaged as a jar, and its dependencies declared externally: - Incompatible because this component declares an API of a component compatible with Java 17 and the consumer needed a runtime of a component compatible with Java 11 - Other compatible attribute: - Doesn't say anything about org.gradle.plugin.api-version (required '7.6.1') - Variant 'javadocElements' capability org.springframework.boot:spring-boot-gradle-plugin:3.1.0 declares a runtime of a component, and its dependencies declared externally: - Incompatible because this component declares documentation and the consumer needed a library - Other compatible attributes: - Doesn't say anything about its target Java version (required compatibility with Java 11) - Doesn't say anything about its elements (required them packaged as a jar) - Doesn't say anything about org.gradle.plugin.api-version (required '7.6.1') - Variant 'mavenOptionalApiElements' capability org.springframework.boot:spring-boot-gradle-plugin-maven-optional:3.1.0 declares a library, packaged as a jar, and its dependencies declared externally: - Incompatible because this component declares an API of a component compatible with Java 17 and the consumer needed a runtime of a component compatible with Java 11 - Other compatible attribute: - Doesn't say anything about org.gradle.plugin.api-version (required '7.6.1') - Variant 'mavenOptionalRuntimeElements' capability org.springframework.boot:spring-boot-gradle-plugin-maven-optional:3.1.0 declares a runtime of a library, packaged as a jar, and its dependencies declared externally: - Incompatible because this component declares a component compatible with Java 17 and the consumer needed a component compatible with Java 11 - Other compatible attribute: - Doesn't say anything about org.gradle.plugin.api-version (required '7.6.1') - Variant 'runtimeElements' capability org.springframework.boot:spring-boot-gradle-plugin:3.1.0 declares a runtime of a library, packaged as a jar, and its dependencies declared externally: - Incompatible because this component declares a component compatible with Java 17 and the consumer needed a component compatible with Java 11 - Other compatible attribute: - Doesn't say anything about org.gradle.plugin.api-version (required '7.6.1') - Variant 'sourcesElements' capability org.springframework.boot:spring-boot-gradle-plugin:3.1.0 declares a runtime of a component, and its dependencies declared externally: - Incompatible because this component declares documentation and the consumer needed a library - Other compatible attributes: - Doesn't say anything about its target Java version (required compatibility with Java 11) - Doesn't say anything about its elements (required them packaged as a jar) - Doesn't say anything about org.gradle.plugin.api-version (required '7.6.1') * Try: > Run with --stacktrace option to get the stack trace. > Run with --info or --debug option to get more log output. > Run with --scan to get full insights. * Get more help at https://help.gradle.org BUILD FAILED in 4s

=========================================[질문 템플릿]1. 강의 내용과 관련된 질문인가요? (예/아니오) 네2. 인프런의 질문 게시판과 자주 하는 질문에 없는 내용인가요? (예/아니오) 네3. 질문 잘하기 메뉴얼을 읽어보셨나요? (예/아니오)네[질문 내용] @GetMapping("/api/v1/orders") public List<Order> ordersV1() { List<Order> all = orderRepository.findAllByString(new OrderSearch()); for (Order order : all) { order.getMember().getName(); order.getDelivery().getAddress(); List<OrderItem> orderItems = order.getOrderItems(); orderItems.stream().forEach(o -> o.getItem().getName()); } return all; }OSIV를 껏을 경우에 order.getMember().getName()에서 에러가 뜨는게 맞다고하셨습니다. 그런데 ordersv1 사용시에 findAllByString을 사용하면서 트랜잭션을 애초에 사용하지 않았는데 어느 타이밍에 트랜잭션이 켜지고 꺼지면서 커넥션이 사라지는지 궁금합니다.

스프링 실행이 안되서 보니까h2연동을 안해서 그렇던데, 항상 h2를 연결해야지 스프링이 등록이 되는 이유가 무엇인가요 ?

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)이거 뜨시면https://jaynamm.tistory.com/entry/Mac-ERROR-2002-HY000-Cant-connect-to-local-MySQL-server-through-socket-tmpmysqlsock-2 여기 참고해보세용~

이해하는데 시간이 좀 걸려서, 다른 분들도 고민하실까봐 글 남겨요 public static int VISIT = 2;미로찾기 문제에서 나오는 상수 VISIT 의 쓰임새는탐색한 모든 위치를 VISIT 주는 것이 아니라,정답의 길만 VISIT을 주고있어요 따라서 그 위쪽 로직에서newPosition.direction = direction +1;을 주는 겁니다. NOTVISIT 이여도 이미 갔던 path를 다시 안가기 위해서요 

[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]orderList.html 에서 <script> 부분을 IntelliJ에서 인식하지 못합니다. 그래서 이 부분이 실행되지 않는 것 같습니다.인쇄한 내용이나 강의 화면에는 색이 구별되어 보이는데, 어떤 부분이 잘못되었는지 찾을 수가 없습니다.도움 부탁드리겠습니다.

안녕하세요 강의 잘 들었습니다!완강하고 나서 몇 가지 궁금증이 생겨 질문드립니다.분산 락을 "분산" 락이라고 부르는 이유가 뭔가요?Redis가 인메모리 DB이다보니 서버마다 Redis를 가지고 있어 여러 서버에서 모두 가지고 있어 분산 락이라고 부르는 걸까요?Redis가 여러 서버에 분산되어 있다보니 서로 싱크를 맞추기가 쉽지 않을 것 같은데 이런 부분은 어떻게 해결할 수 있나요?서로 싱크가 맞지 않는다면 synchronized 키워드의 문제점처럼 여러 프로세스에서 접근할 수 있어 정합성이 보장되지 않을 것 같아서요!Redis는 인메모리 DB라 휘발성인데 서버가 다운될 경우 복구는 어떤식으로 이뤄지는지 궁금합니다!