text 파일을 열 때 그 파일이 c 드라이브에 이미 만들어져 있어야 하는건가요? 파일입출력은 컴퓨터에 저장된 파일을 비주얼스튜디오를 이용해서 열고 입출력하는 건가요? 마지막으로 파일 입출력을 왜 쓰는지, 언제 쓰는지 궁금합니다!

지금 같은문제는 n값이 적어서 배열의 크기가 작지만 배열의 크기를 클때도 대비해서 이차원배열 동적할당하는법을 알아두는게 나중에도움이 될까요?

이미지 파일 이름 정보를 가져와서 리듀써에서 src의 값만 배열로 다시 처리하려고 하는데, 리듀써에서 처리 하는 방식이 안되서 문의 드립니다. 문법이 잘 못됬나요?그리고 리듀써에 로그찍으면 안나오는 건가요?

선생님. 근데 curry같은 경우는 인자를 2개째 받게 되면 실행이 되잖아요. 만약 갯수를 설정해서 3개를 받았을때도 실행되도록 하고 싶은데, 조건문을 사용하여 curry함수 로직을 바꾸면 될까요?  filter함수를 이렇게 만들고 싶거든요... 근데 저 함수는 인자 3개를 받아 실행을 해야해서 curry가 안되더라구요 혹은 저 함수를 인자 2개만 받아도 조건과 push함수가 다르도록 고치는 방법이 있다면 조언해주시면 감사드리겠습니다.

혹시 다음에 진행하실 때 제가 원격으로 한번 봐드리면 좋을 것 같은데 진행하시기 전에 질문 한번 남겨주세요 ㅎㅎ --> 지금 가능하실까요?

insert into item (name, price, stock_quantity, author, isbn, dtype, item_id) values (?, ?, ?, ?, ?, 'B', ?) [23505-199]]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement] with root cause org.h2.jdbc.JdbcSQLIntegrityConstraintViolationException: ユニークインデックス、またはプライマリキー違反: "PRIMARY KEY ON PUBLIC.ITEM(ITEM_ID) ['B', 1, '1', 1, 1, '1', '1', NULL, NULL, NULL, NULL]" Unique index or primary key violation: "PRIMARY KEY ON PUBLIC.ITEM(ITEM_ID) ['B', 1, '1', 1, 1, '1', '1', NULL, NULL, NULL, NULL]"; SQL statement: insert into item (name, price, stock_quantity, author, isbn, dtype, item_id) values (?, ?, ?, ?, ?, 'B', ?) [23505-199] at org.h2.message.DbException.getJdbcSQLException(DbException.java:457) ~[h2-1.4.199.jar:1.4.199] at org.h2.engine.SessionRemote.done(SessionRemote.java:607) ~[h2-1.4.199.jar:1.4.199] at org.h2.command.CommandRemote.executeUpdate(CommandRemote.java:237) ~[h2-1.4.199.jar:1.4.199] at org.h2.jdbc.JdbcPreparedStatement.executeUpdateInternal(JdbcPreparedStatement.java:200) ~[h2-1.4.199.jar:1.4.199] at org.h2.jdbc.JdbcPreparedStatement.executeUpdate(JdbcPreparedStatement.java:154) ~[h2-1.4.199.jar:1.4.199] at com.zaxxer.hikari.pool.ProxyPreparedStatement.executeUpdate(ProxyPreparedStatement.java:61) ~[HikariCP-3.2.0.jar:na] at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeUpdate(HikariProxyPreparedStatement.java) ~[HikariCP-3.2.0.jar:na] at com.p6spy.engine.wrapper.PreparedStatementWrapper.executeUpdate(PreparedStatementWrapper.java:94) ~[p6spy-3.8.2.jar:na] at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:175) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3176) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3690) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:90) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:604) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:478) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:356) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:39) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1454) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:511) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:3290) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.internal.SessionImpl.beforeTransactionCompletion(SessionImpl.java:2486) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.beforeTransactionCompletion(JdbcCoordinatorImpl.java:473) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.beforeCompletionCallback(JdbcResourceLocalTransactionCoordinatorImpl.java:178) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.access$300(JdbcResourceLocalTransactionCoordinatorImpl.java:39) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:271) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:104) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:532) ~[spring-orm-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:746) ~[spring-tx-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:714) ~[spring-tx-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:534) ~[spring-tx-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:305) ~[spring-tx-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98) ~[spring-tx-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688) ~[spring-aop-5.1.9.RELEASE.jar:5.1.9.RELEASE] at jpabook.jpashop.services.ItemService$$EnhancerBySpringCGLIB$$52750fed.saveItem(<generated>) ~[classes/:na] at jpabook.jpashop.Controller.ItemController.create(ItemController.java:35) ~[classes/: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:564) ~[na:na] at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:892) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1039) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:908) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:660) ~[tomcat-embed-core-9.0.22.jar:9.0.22] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.22.jar:9.0.22] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.22.jar:9.0.22] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.22.jar:9.0.22] at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.22.jar:9.0.22] at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.22.jar:9.0.22] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) [tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) [tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:853) [tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587) [tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.22.jar:9.0.22] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135) [na:na] at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) [na:na] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.22.jar:9.0.22] at java.base/java.lang.Thread.run(Thread.java:844) [na:na] 보면 주키 값이 겹쳐서 안된다고 하는데, GeneratedValue 자동생성전략으로 되어있고 서버종료 안하고 할시 문제없이 잘됩니다. 혹시 밑의 에러하고 관련이 있을까요? 2020-03-14 13:09:54.947 DEBUG 30884 --- [  restartedMain] org.hibernate.SQL                        :           drop table item if exists 2020-03-14 13:09:54.947  INFO 30884 --- [  restartedMain] p6spy                                    : #1584158994947 | took 0ms | statement | connection 2| url jdbc:h2:tcp://localhost/~/jpashop     drop table item if exists     drop table item if exists; 2020-03-14 13:09:54.948  WARN 30884 --- [  restartedMain] o.h.t.s.i.ExceptionHandlerLoggedImpl     : GenerationTarget encountered exception accepting command : Error executing DDL "     drop table item if exists" via JDBC Statement org.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing DDL "     drop table item if exists" via JDBC Statement at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:67) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.tool.schema.internal.SchemaDropperImpl.applySqlString(SchemaDropperImpl.java:375) [hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.tool.schema.internal.SchemaDropperImpl.applySqlStrings(SchemaDropperImpl.java:359) [hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.tool.schema.internal.SchemaDropperImpl.dropFromMetadata(SchemaDropperImpl.java:241) [hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.tool.schema.internal.SchemaDropperImpl.performDrop(SchemaDropperImpl.java:154) [hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.tool.schema.internal.SchemaDropperImpl.doDrop(SchemaDropperImpl.java:126) [hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.tool.schema.internal.SchemaDropperImpl.doDrop(SchemaDropperImpl.java:112) [hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.performDatabaseAction(SchemaManagementToolCoordinator.java:144) [hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.process(SchemaManagementToolCoordinator.java:72) [hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:310) [hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:467) [hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:939) [hibernate-core-5.3.10.Final.jar:5.3.10.Final] at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:57) [spring-orm-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) [spring-orm-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:390) [spring-orm-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:377) [spring-orm-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) [spring-orm-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1837) [spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1774) [spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) [spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) [spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) [spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) [spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) [spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1105) ~[spring-context-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) ~[spring-context-5.1.9.RELEASE.jar:5.1.9.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.1.7.RELEASE.jar:2.1.7.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:743) ~[spring-boot-2.1.7.RELEASE.jar:2.1.7.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:390) ~[spring-boot-2.1.7.RELEASE.jar:2.1.7.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:312) ~[spring-boot-2.1.7.RELEASE.jar:2.1.7.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1214) ~[spring-boot-2.1.7.RELEASE.jar:2.1.7.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1203) ~[spring-boot-2.1.7.RELEASE.jar:2.1.7.RELEASE] at jpabook.jpashop.JpashopApplication.main(JpashopApplication.java:9) ~[classes/: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:564) ~[na:na] at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.1.7.RELEASE.jar:2.1.7.RELEASE] Caused by: org.h2.jdbc.JdbcSQLSyntaxErrorException: "FKIJA6HJJIIT8DPRNMVTVGDP6RU" が依存しているため、"ITEM" をドロップすることはできません Cannot drop "ITEM" because "FKIJA6HJJIIT8DPRNMVTVGDP6RU" depends on it; SQL statement:     drop table item if exists [90107-199] at org.h2.message.DbException.getJdbcSQLException(DbException.java:573) ~[h2-1.4.199.jar:1.4.199] at org.h2.engine.SessionRemote.done(SessionRemote.java:607) ~[h2-1.4.199.jar:1.4.199] at org.h2.command.CommandRemote.executeUpdate(CommandRemote.java:237) ~[h2-1.4.199.jar:1.4.199] at org.h2.jdbc.JdbcStatement.executeInternal(JdbcStatement.java:233) ~[h2-1.4.199.jar:1.4.199] at org.h2.jdbc.JdbcStatement.execute(JdbcStatement.java:205) ~[h2-1.4.199.jar:1.4.199] at com.zaxxer.hikari.pool.ProxyStatement.execute(ProxyStatement.java:95) ~[HikariCP-3.2.0.jar:na] at com.zaxxer.hikari.pool.HikariProxyStatement.execute(HikariProxyStatement.java) ~[HikariCP-3.2.0.jar:na] at com.p6spy.engine.wrapper.StatementWrapper.execute(StatementWrapper.java:114) ~[p6spy-3.8.2.jar:na] at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:54) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final] ... 39 common frames omitted 이 에러는 drop table 할수 없다고 하는데.. 음 어디서 꼬인건지 알수가 없습니다 ㅠ server: port: 8081 spring: datasource: url: jdbc:h2:tcp://localhost/~/jpashop username: sa password: driver-class-name: org.h2.Driver jpa: hibernate: ddl-auto: create #Entity를 자동으로 지우고 다시 생성하는 모드 properties: hibernate: format_sql: true # show_sql: true # System.out으로 SQL 을 보여줌 쓰면 안됨 실제 개발에선 logging: level: org.hibernate.SQL: debug org.hibernate.type: trace 이건 제 application.yml 입니다.

강의에서 MainPosts는 MainMessage로 Comments는 MainContents로  치환을 해서 대화목록 만들고 그 안에서 글을 작성하는 건 되는데  그 글에서 댓글을 다는 게 안되서 질문 드립니다 그 글에서 댓글은 Comments로 정의했고 reducers/message.js Comment 부분 export const initialState = {     mainMessages: [{         id: 1,         User: {             id: 1,             name: '이수현',         },         Others: [{             id: 2,             name: '김민지',         },         {             id: 3,             name: '이우리',         }],         mainContents: [{             id: 1,             User: {                 id: 2,                 name: '이수현',                 avatar: 'https://zos.alipayobjects.com/rmsportal/ODTLcjxAfvqbxHnVXCYX.png',             },             content: '안녕',             img: 'https://images.unsplash.com/photo-1484480974693-6ca0a78fb36b?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1952&q=80',             Comments: [],         },         {             id: 2,             User: {                 id: 1,                 name: '김민지',                 avatar: 'https://zos.alipayobjects.com/rmsportal/ODTLcjxAfvqbxHnVXCYX.png',             },             content: '안농',             img: 'https://images.unsplash.com/photo-1484480974693-6ca0a78fb36b?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1952&q=80',             Comments: [],         }],     }],     imagePaths: [],     addMessageErrorReason: '',     isAddingMessage: false,     MessageAdded: false,     isAddingContent: false,     addContentErrorReason: '',     contentAdded: false,     isAddingComment: false,     addCommentErrorReason: '',     commentAdded: false, } const dummyContent = {     id: 3,     User: {         id: 6,         name: '김하나',         avatar: 'https://zos.alipayobjects.com/rmsportal/ODTLcjxAfvqbxHnVXCYX.png',     },     content: '더미 댓글입니다.',     img: 'https://images.unsplash.com/photo-1484480974693-6ca0a78fb36b?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1952&q=80',     Comments: [],     createdAt: new Date(), } case ADD_COMMENT_REQUEST:{             return{                 ...state,                 isAddingComment: true,                 addCommentErrorReason:'',                 commentAdded: false,             };         }         case ADD_COMMENT_SUCCESS:{             const messageIndex = state.mainMessages.findIndex(v => v.id === action.data.messageId);             const message = state.mainMessages[messageIndex];             const contentIndex = message.mainContents.findIndex(v => v.id === action.data.contentId);             const content = state.mainBoards[contentIndex];             const Comments = [...content.Comments, dummyComment];             const mainContents = [...state.mainContents];             mainContents[contentIndex] = {...content, Comments};             return{                 ...state,                 isAddingComment: false,                 mainMessages,                 mainContents,                 commentAdded: true,             };         }         case ADD_COMMENT_FAILURE:{             return{                 ...state,                 isAddingComment:false,                 addCommentErrorReason: action.error,             };        } sagas/message.js function addCommentAPI(){ } function* addComment(action) {     try{         yield delay(2000);         yield put({             type: ADD_COMMENT_SUCCESS,             data: {                 messageId: action.data.messageId,                 contentId: action.data.contentId,             },         });     }catch (e) {         yield put({             type: ADD_COMMENT_FAILURE,             error: e,         });     } } function* watchAddComment() {     yield takeLatest(ADD_COMMENT_REQUEST, addComment); } pages/messageCard.js     return (         <div>             {message.mainContents.map((v) => {                 return (                     <>                         <Comment                             actions={[                                 <span key="comment-basic-like">                                     <Tooltip title="Like">                                         {React.createElement(action === 'liked' ? LikeFilled : LikeOutlined, {                                             onClick: like,                                         })}                                     </Tooltip>                                     <span className="comment-action">{likes}</span>                                 </span>,                                 <span key=' key="comment-basic-dislike"'>                                     <Tooltip title="Dislike">                                         {React.createElement(action === 'liked' ? DislikeFilled : DislikeOutlined, {                                             onClick: dislike,                                         })}                                     </Tooltip>                                     <span className="comment-action">{dislikes}</span>                                 </span>,                                 // <span key="comment-basic-reply-to"><Icon type ="message" key="message" onClick={onToggleComment}/></span>,                                 <span key="comment-basic-reply-to">                                     <Tooltip title="Reply">                                         {React.createElement(action === 'reply' ? MessageFilled : MessageOutlined, {                                             onClick: () => {                                                 setContentIdState(v.id);                                                 console.log(v.id);                                             },                                         })}                                     </Tooltip>                                     {/* <span className="comment-action">{dislikes}</span> */}                                 </span>,                             ]}                             author={<a>{v.User.name}</a>}                             avatar={                                 <Avatar                                     src={v.User.avatar}                                 // alt="Han Solo"                                 />                             }                             content={                                 <p>                                     {v.content}                                 </p>                             }                             datetime={                                 <Tooltip title={moment().format('YYYY-MM-DD HH:mm:ss')}>                                     <span>{moment().fromNow()}</span>                                 </Tooltip>                             }                         >                             {/* {v.id == contentId?<MessageCardComment content={v} key={v}/>: <></>} */}                             {v.id == contentId ?                                 <>                                     <Form onSubmit={(e) => {                                         e.preventDefault();                                         if (!user) {                                             return alert('로그인이 필요합니다.');                                         }                                         dispatch({                                             type: ADD_COMMENT_REQUEST,                                             data: {                                                 messageId: message.id,                                                 contentId: v.id,                                             },                                         })                                     }}>                                         <Form.Item>                                             <Input.TextArea rows={4} value={commentText} onChange={onChangeCommentText} />                                         </Form.Item>                                         <Button type="primary" htmlType="submit" loading={isAddingComment}>입력</Button>                                     </Form>                                     <List                                         header={`${v.Comments ? v.Comments.length : 0} 댓글`}                                         itemLayout="horizontal"                                         dataSource={v.Comments || []}                                         renderItem={item => (                                             <li>                                                 <Comment                                                     author={item.User.name}                                                     avatar={<Avatar>{item.User.name[0]}</Avatar>}                                                     content={item.content}                                                 //   datetime={item.createdAt}                                                 />                                             </li>                                         )}                                     />                                 </>                                 : <></>}                         </Comment>                         <Divider />                     </>                 )             })}         </div>    ); 저렇게 MessageId하고 ContentId를 두개를 넘기나요? 넘겼는데 자꾸 FAILURE라고 떠서  그리고 저기서 원래 onSubmitCommentForm을 함수로 빼려고 했는데 그럼 v.id 범위를 벗어나서 안에다가 넣었는데 함수로 하고 싶으면 onSubmitCommentForm(v.id)를 넣어줘도 되는 건가요?  만약 저기서 댓글의 댓글을 추가한다고 하면 messageId, contentId, commentId가 다 필요한 건가요? 그럼 그 변수는 props 여러개로 넘기는 건가요? 아니면 저렇게 한페이지에 있어야되는 건가요..? 

삭제된 글입니다

강의 자료 소스는 다운받을 수 없나요?

안녕하세요.유튜브 보일러 플레이트 강의 수강 중인 사람입니다. 강의 정말 잘보고 있는데 강의 중에 사용하신 ppt 파일을 혹시 받을 수 있을까요? 공부중인 학생이어서 참고해서 정리하려고 합니다!

삭제된 글입니다

이번 수업과는 상관없지만 궁금해서 질문 드립니다. 오늘 수업에서 작성한 코드 중에 print('Car Detail Info : {} {}'.format(self._company, self._details.get('price'))) 위의 코드를 print(f'Car Detail Info: {self._company} {self._details.get('price')}') 로도 사용할 수 있다고 알고 있는데 다른 것은 다 적용이 되는데 {self._details.get('price')} 이부분에서 에러가 납니다. 혹시 f'' 로 활용할 때에는 .format()과 달리 활용 범위가 다른 건지 궁금합니다.

body에 바로 이벤트 위임을 하면 전체 다 쓸 수 있는데 그렇게 안하는 이유가 궁금합니다. .stage {     width: 100vw;     height: 100vh;     background-color: #333; } 이랑  body {     background-color: #333; } 같아 보이는데 웹 화면 전체를 다 쓰더라도 body에 css를 적용하지 않고 div로 한 번 감싸고 쓰는게 규칙인가요?? 너무 기초적인 질문 같아 죄송합니다..ㅠ

안녕하세요. 최근에 강의 수강하면서 열공하고 있습니다. 강의 다 듣고 실습을 하고 있는 중에 대시보드 로그인 화면에서 SKIP이 되지 않아 어려움에 있습니다. 강의 자료실에 있는 내용으로 진행하고 있습니다. master 1대, 노드 2대로 구성했구요. 클러스터도 잘 구성되어 있고,  cailco, coredns 등도 정상적으로 Running 상태입니다. 도움 부탁드립니다. 감사합니다.

안녕하세요 강사님 깃허브 가서 강사님께서 작성하신 현재 nDTlD로 class가 되어있어서 변경해서 넣어보았습니다. 그리고 아래 같은 질문에 강사님 답변이 있어서 강사님 코드에서 while (result.length <= 30) {  <- 이 부분 바로 앞에 await page.waitForSelector('.nDTlD'); 를 넣어보고 해보았습니다. https://github.com/ZeroCho/nodejs-crawler/blob/master/7.image-scroll/index.js (강사님 코드 주소입니다.) 하지만 제가 해본 결과로는 같은 에러가 발생하여 질문을 드립니다. 혹시 한번만 더 확인을 해 주실 수 있을까요?? 제가 해보기로는 querySelectorAll('.nDTlD img.2zEKz') 을 해서 src를 검출했을 떄는 에러가 나지 않지만 .nDTlD로 먼저 추출한 후 evaluate 함수 안에서 src 작업을 하면 에러가 나는 것 같습니다. 시간 나실때 한번 확인 해 주시고 답변해주시면 감사하겠습니다.

안녕하세요 항상 수업 열심히 듣고 있습니다! 상품등록 구현에 대해서 여쭤볼 것이 있는데요. 상품등록 컨트롤러를 작성하고 상품 정보 입력 후 submit 버튼을 누르면 다음과 같은 페이지로 이동합니다. DB를 보니 첫번째 저장 상품만 들어가있고 그 뒤에 상품들은 들어가있지 않습니다. Whitelabel Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback. Sat Mar 14 00:40:31 KST 2020 There was an unexpected error (type=Internal Server Error, status=500). could not execute statement; SQL [n/a]; constraint ["PRIMARY KEY ON PUBLIC.ITEM(ITEM_ID) ['B', 1, STRINGDECODE('\ub77c\uc774\uc5b8'), 10000, 2, STRINGDECODE('\uce74\uce74\uc624'), '111222333', NULL, NULL, NULL, NULL]"; SQL statement: insert into item (name, prices, stock_quantity, author, isbn, dtype, item_id) values (?, ?, ?, ?, ?, 'B', ?) [23505-200]]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement 계속 찾아봐도 무엇 때문에 오류가 난 것인지 모르겠어서요ㅠㅠ 답변 기다리겠습니다. 감사합니다! +) 오늘 회원가입 기능을 다시해보니 회원가입도 이 에러 페이지로 넘어갑니다. SQL문이 처리가 안되는 것 같습니다. Whitelabel Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback. Sat Mar 14 19:07:34 KST 2020 There was an unexpected error (type=Internal Server Error, status=500). could not execute statement; SQL [n/a]; constraint ["PRIMARY KEY ON PUBLIC.MEMBER(MEMBER_ID) [1, STRINGDECODE('\uc11c\uc6b8'), STRINGDECODE('\uc2b9\ubc29\ub098\uae38'), '12345', STRINGDECODE('\uc774\uc9c4\uc8fc')]"; SQL statement: insert into member (city, street, zipcode, name, member_id) values (?, ?, ?, ?, ?) [23505-200]]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement

로그아웃 버튼을 눌렀는데 아무런 증상이 나타나지 않습니다. 처음 로그인할때는 제대로 TabPage로 가는데  AccoutPage에서 로그아웃을 눌렀는데 다시  LoginPage로 가지지않네요 onPressed: () { FirebaseAuth.instance.signOut(); _googleSignIn.signOut();},

#include <stdio.h> #include <vector> #include <stack> #include <algorithm> using namespace std; int main(int argc, char** argv) { //freopen("input.txt", "rt", stdin); char ch; stack<char> s; while(scanf("%c", &ch) != -1){ if(ch == '(') s.push(ch); else if(ch == ')'){ if(s.empty()){ printf("NO"); return 0; } s.pop(); } } if(s.empty()) printf("YES"); else printf("NO"); return 0; } 테스트케이스 1번, 5번 경우에서 타임 리미트가 발생합니다ㅠㅠ. scanf("%c", &ch) != -1) 이 표현이 잘못된 표현인지 궁금합니다. scanf로 읽는 동시에 처리하는 거랑 배열로 다 읽은 후 처리하는데 차이가 있나요?? 항상 좋은 강의 감사합니다.

안녕하세요. 정말 좋은 강의 항상 잘 듣고 있습니다. Repository save 메서드는 Member 를 반환하기보다는 id를 반환하는 식으로 구성하셨는데 이게 기본편에서 커맨드와 커리를 분리한기위함이라고 하셨던걸로 기억합니다. 이론적으로는 조회와 insert update 등을 분리한다고 는 이해했는데 실제 웹 어플리케이션 개발떄 이로써는 얻는 이점에 대해 좀더 자세히 들을수있을까요? 그리고 실제 실무에서는 어느정도까지 분리해서 보통 사용하나요?

var direction = target.position - eyeTransform.position; direction.y = eyeTransform.forward.y; 여기서 forward.y가 이해가 안 갑니다;; 그냥 position.y하면 되지 않나요? 그리고 forward라는 게 정확히 어떤 건지 감이 잘.. eyeTransform의 앞면이라는 게, 로컬 좌표로서 z방향 단위벡터로서 글로벌 좌표로 표시되는 거라는 건가요? 아어 복잡쓰 ㅠㅠ