제가 생각하기에 toString으로 받아와야하는데 지금 받아오지를 못하는것 같습니다 HttpServletRequest클래스에서 toString()을 찾아보는데 따로 없는것같네요   영한님처럼 주소전체가 로그에 뜨게하려면 어떻게 해야할까요   참고로 코드는 동일합니다.

브레이크 포인트가 안 걸려서 확인 해본 결과 파일을 로드 하는것 까지는 문제가 없어 보입니다. 다음을 실행하니 data에 null이 들어가서 오류 로그 를 확인해보니 The referenced script on this Behaviour is missing!이란 오류가 떠서 구글링을 해봤는데 스크립트가 누락됐다는 의미라고 합니다. 연결을 다 잘되어 있는거 같은데 스크립트 삭제로 인한 컴포넌트가 누락인 것 같다 그래서  https://heartgamer.wordpress.com/2015/02/23/%EC%8A%A4%ED%81%AC%EB%A6%BD%ED%8A%B8-%EC%82%AD%EC%A0%9C%EB%A1%9C-%EC%9D%B8%ED%95%B4-%EC%BB%B4%ED%8F%AC%EB%84%8C%ED%8A%B8%EA%B0%80-missing-%EB%90%98%EB%8A%94-%EB%AC%B8%EC%A0%9C-%ED%95%B4%EA%B2%B0/ 여기에 있는대로 해봤는데도 문제를 못 찾겠습니다.  

문제와 동일하게 쿼리를 작성했는데 sucess 가 안나옵니다!   select distinct bst.n      , case            when bst.p is null then 'root'            when bst2.n is null then 'leaf'            else 'inner'        endfrom bst      left join bst as bst2 on bst.n = bst2.porder by bst.n

안녕하세요 그동안 강의 너무 잘 들었습니다. 다름이 아니라 제가 이 강의를 통해 들은 프로젝트를 서버를 통해 올려 보려고 하는데, 에러가 계속 발생하여 도제히 모르겠어서 질문드립니다. 현재 aws를 활용하여 rds,mysql을 활용하여 db연동시킨후,ec2를 이용해 배포를 하려했습니다. 계속 진행되지 않아 일단, 우분투 서버에서의 jdk및 환경변수설정 등 여러가지를 완료하였으나 계속 에러가 발생합니다. 그래서 또 제 다른컴퓨터에 자바ide만깔려있는 곳에서도 실행했는데 여긴 구동되고 이 서버에서만 에러가 발생하여 여러밤을 꼬박 새었습니다.ㅜㅜ (죄송합니다 사진이 역순으로 된거 같아요!)  .   ____          _            __ _ _ /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/  ___)| |_)| | | | | || (_| |  ) ) ) )  '  |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot ::                (v2.4.1) 2022-08-21 13:12:07.451  INFO 4302 --- [           main] jpabook.jpashop.JpashopApplication       : Starting JpashopApplication using Java 11.0.16 on ip-172-31-43-152 with PID 4302 (/home/ubuntu/spring/jpashop-0.0.1-SNAPSHOT.jar started by ubuntu in /home/ubuntu/spring)2022-08-21 13:12:07.459  INFO 4302 --- [           main] jpabook.jpashop.JpashopApplication       : No active profile set, falling back to default profiles: default2022-08-21 13:12:09.435  INFO 4302 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.2022-08-21 13:12:09.479  INFO 4302 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 27 ms. Found 0 JPA repository interfaces.2022-08-21 13:12:10.980  INFO 4302 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)2022-08-21 13:12:11.015  INFO 4302 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]2022-08-21 13:12:11.018  INFO 4302 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.41]2022-08-21 13:12:11.187  INFO 4302 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext2022-08-21 13:12:11.190  INFO 4302 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 3576 ms2022-08-21 13:12:12.337  INFO 4302 --- [           main] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [name: default]2022-08-21 13:12:12.470  INFO 4302 --- [           main] org.hibernate.Version                    : HHH000412: Hibernate ORM core version 5.4.25.Final2022-08-21 13:12:12.839  INFO 4302 --- [           main] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.1.2.Final}2022-08-21 13:12:13.100  INFO 4302 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...2022-08-21 13:12:44.410 ERROR 4302 --- [           main] com.zaxxer.hikari.pool.HikariPool        : HikariPool-1 - Exception during pool initialization. com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.        at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:836) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:456) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:198) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:138) ~[HikariCP-3.4.5.jar!/:na]        at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:358) ~[HikariCP-3.4.5.jar!/:na]        at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:206) ~[HikariCP-3.4.5.jar!/:na]        at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:477) ~[HikariCP-3.4.5.jar!/:na]        at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:560) ~[HikariCP-3.4.5.jar!/:na]        at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:115) ~[HikariCP-3.4.5.jar!/:na]        at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112) ~[HikariCP-3.4.5.jar!/:na]        at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess.obtainConnection(JdbcEnvironmentInitiator.java:180) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:68) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:35) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:101) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:263) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:237) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.injectServices(DefaultIdentifierGeneratorFactory.java:152) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.service.internal.AbstractServiceRegistryImpl.injectDependencies(AbstractServiceRegistryImpl.java:286) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:243) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.<init>(InFlightMetadataCollectorImpl.java:176) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:127) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:1224) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1255) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:58) ~[spring-orm-5.3.2.jar!/:5.3.2]        at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) ~[spring-orm-5.3.2.jar!/:5.3.2]        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:409) ~[spring-orm-5.3.2.jar!/:5.3.2]        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:396) ~[spring-orm-5.3.2.jar!/:5.3.2]        at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) ~[spring-orm-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1847) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1784) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:609) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:531) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1159) ~[spring-context-5.3.2.jar!/:5.3.2]        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913) ~[spring-context-5.3.2.jar!/:5.3.2]        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:588) ~[spring-context-5.3.2.jar!/:5.3.2]        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144) ~[spring-boot-2.4.1.jar!/:2.4.1]        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:767) ~[spring-boot-2.4.1.jar!/:2.4.1]        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) ~[spring-boot-2.4.1.jar!/:2.4.1]        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426) ~[spring-boot-2.4.1.jar!/:2.4.1]        at org.springframework.boot.SpringApplication.run(SpringApplication.java:326) ~[spring-boot-2.4.1.jar!/:2.4.1]        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1309) ~[spring-boot-2.4.1.jar!/:2.4.1]        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1298) ~[spring-boot-2.4.1.jar!/:2.4.1]        at jpabook.jpashop.JpashopApplication.main(JpashopApplication.java:10) ~[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:566) ~[na:na]        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49) ~[jpashop-0.0.1-SNAPSHOT.jar:na]        at org.springframework.boot.loader.Launcher.launch(Launcher.java:107) ~[jpashop-0.0.1-SNAPSHOT.jar:na]        at org.springframework.boot.loader.Launcher.launch(Launcher.java:58) ~[jpashop-0.0.1-SNAPSHOT.jar:na]        at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:88) ~[jpashop-0.0.1-SNAPSHOT.jar:na]Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:na]        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:na]        at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na]        at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490) ~[na:na]        at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:167) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:89) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.NativeSession.connect(NativeSession.java:144) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:956) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:826) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        ... 58 common frames omittedCaused by: java.net.SocketTimeoutException: connect timed out        at java.base/java.net.PlainSocketImpl.socketConnect(Native Method) ~[na:na]        at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:412) ~[na:na]        at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:255) ~[na:na]        at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:237) ~[na:na]        at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:na]        at java.base/java.net.Socket.connect(Socket.java:609) ~[na:na]        at com.mysql.cj.protocol.StandardSocketFactory.connect(StandardSocketFactory.java:155) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:63) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        ... 61 common frames omitted 2022-08-21 13:12:44.420  WARN 4302 --- [           main] o.h.e.j.e.i.JdbcEnvironmentInitiator     : HHH000342: Could not obtain connection to query metadata com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.        at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:836) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:456) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:198) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:138) ~[HikariCP-3.4.5.jar!/:na]        at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:358) ~[HikariCP-3.4.5.jar!/:na]        at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:206) ~[HikariCP-3.4.5.jar!/:na]        at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:477) ~[HikariCP-3.4.5.jar!/:na]        at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:560) ~[HikariCP-3.4.5.jar!/:na]        at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:115) ~[HikariCP-3.4.5.jar!/:na]        at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112) ~[HikariCP-3.4.5.jar!/:na]        at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess.obtainConnection(JdbcEnvironmentInitiator.java:180) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:68) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:35) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:101) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:263) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:237) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.injectServices(DefaultIdentifierGeneratorFactory.java:152) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.service.internal.AbstractServiceRegistryImpl.injectDependencies(AbstractServiceRegistryImpl.java:286) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:243) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.<init>(InFlightMetadataCollectorImpl.java:176) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:127) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:1224) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1255) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:58) ~[spring-orm-5.3.2.jar!/:5.3.2]        at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) ~[spring-orm-5.3.2.jar!/:5.3.2]        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:409) ~[spring-orm-5.3.2.jar!/:5.3.2]        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:396) ~[spring-orm-5.3.2.jar!/:5.3.2]        at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) ~[spring-orm-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1847) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1784) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:609) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:531) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1159) ~[spring-context-5.3.2.jar!/:5.3.2]        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913) ~[spring-context-5.3.2.jar!/:5.3.2]        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:588) ~[spring-context-5.3.2.jar!/:5.3.2]        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144) ~[spring-boot-2.4.1.jar!/:2.4.1]        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:767) ~[spring-boot-2.4.1.jar!/:2.4.1]        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) ~[spring-boot-2.4.1.jar!/:2.4.1]        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426) ~[spring-boot-2.4.1.jar!/:2.4.1]        at org.springframework.boot.SpringApplication.run(SpringApplication.java:326) ~[spring-boot-2.4.1.jar!/:2.4.1]        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1309) ~[spring-boot-2.4.1.jar!/:2.4.1]        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1298) ~[spring-boot-2.4.1.jar!/:2.4.1]        at jpabook.jpashop.JpashopApplication.main(JpashopApplication.java:10) ~[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:566) ~[na:na]        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49) ~[jpashop-0.0.1-SNAPSHOT.jar:na]        at org.springframework.boot.loader.Launcher.launch(Launcher.java:107) ~[jpashop-0.0.1-SNAPSHOT.jar:na]        at org.springframework.boot.loader.Launcher.launch(Launcher.java:58) ~[jpashop-0.0.1-SNAPSHOT.jar:na]        at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:88) ~[jpashop-0.0.1-SNAPSHOT.jar:na]Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:na]        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:na]        at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na]        at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490) ~[na:na]        at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:167) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:89) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.NativeSession.connect(NativeSession.java:144) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:956) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:826) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        ... 58 common frames omittedCaused by: java.net.SocketTimeoutException: connect timed out        at java.base/java.net.PlainSocketImpl.socketConnect(Native Method) ~[na:na]        at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:412) ~[na:na]        at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:255) ~[na:na]        at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:237) ~[na:na]        at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:na]        at java.base/java.net.Socket.connect(Socket.java:609) ~[na:na]        at com.mysql.cj.protocol.StandardSocketFactory.connect(StandardSocketFactory.java:155) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:63) ~[mysql-connector-java-8.0.22.jar!/:8.0.22]        ... 61 common frames omitted 2022-08-21 13:12:44.430 ERROR 4302 --- [           main] j.LocalContainerEntityManagerFactoryBean : Failed to initialize JPA EntityManagerFactory: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]2022-08-21 13:12:44.431  WARN 4302 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]2022-08-21 13:12:44.439  INFO 4302 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]2022-08-21 13:12:44.467  INFO 4302 --- [           main] ConditionEvaluationReportLoggingListener : Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.2022-08-21 13:12:44.505 ERROR 4302 --- [           main] o.s.boot.SpringApplication               : Application run failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1788) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:609) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:531) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1159) ~[spring-context-5.3.2.jar!/:5.3.2]        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913) ~[spring-context-5.3.2.jar!/:5.3.2]        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:588) ~[spring-context-5.3.2.jar!/:5.3.2]        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144) ~[spring-boot-2.4.1.jar!/:2.4.1]        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:767) ~[spring-boot-2.4.1.jar!/:2.4.1]        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) ~[spring-boot-2.4.1.jar!/:2.4.1]        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426) ~[spring-boot-2.4.1.jar!/:2.4.1]        at org.springframework.boot.SpringApplication.run(SpringApplication.java:326) ~[spring-boot-2.4.1.jar!/:2.4.1]        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1309) ~[spring-boot-2.4.1.jar!/:2.4.1]        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1298) ~[spring-boot-2.4.1.jar!/:2.4.1]        at jpabook.jpashop.JpashopApplication.main(JpashopApplication.java:10) ~[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:566) ~[na:na]        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49) ~[jpashop-0.0.1-SNAPSHOT.jar:na]        at org.springframework.boot.loader.Launcher.launch(Launcher.java:107) ~[jpashop-0.0.1-SNAPSHOT.jar:na]        at org.springframework.boot.loader.Launcher.launch(Launcher.java:58) ~[jpashop-0.0.1-SNAPSHOT.jar:na]        at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:88) ~[jpashop-0.0.1-SNAPSHOT.jar:na]Caused by: org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]        at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:275) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:237) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.injectServices(DefaultIdentifierGeneratorFactory.java:152) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.service.internal.AbstractServiceRegistryImpl.injectDependencies(AbstractServiceRegistryImpl.java:286) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:243) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.<init>(InFlightMetadataCollectorImpl.java:176) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:127) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:1224) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1255) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:58) ~[spring-orm-5.3.2.jar!/:5.3.2]        at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) ~[spring-orm-5.3.2.jar!/:5.3.2]        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:409) ~[spring-orm-5.3.2.jar!/:5.3.2]        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:396) ~[spring-orm-5.3.2.jar!/:5.3.2]        at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) ~[spring-orm-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1847) ~[spring-beans-5.3.2.jar!/:5.3.2]        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1784) ~[spring-beans-5.3.2.jar!/:5.3.2]        ... 25 common frames omittedCaused by: org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set        at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:100) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:54) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:137) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:35) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:101) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:263) ~[hibernate-core-5.4.25.Final.jar!/:5.4.25.Final]        ... 42 common frames omitted ubuntu@ip-172-31-43-152:~/spring$ “

안녕하세요 PrincialDetails를 세션에 담으면 서버 메모리에서 세션을 관리하게 되잖아요. 그렇게 되면 서버가 여러개인 환경이 되었을 때 로그인 한 서버에만 요청을 보내야 하는 상황이 발생하지 않나요? 세션을 특정 서버의 메모리에 담게 되는 순간 jwt 쓰는 좋은 이유가 하나 사라지는게 아닌가해서요.

안녕하세요 강사님  1) 판다스로 한다고 하면 for문과 pandas iloc을 활용하여 정말 간단히 가중이동평균을 구할 수 있는데 SQL에서는 영상의 방법 말고는 다른 수단이 없는건가요??? 예컨대 윈도우를 현재행을 계산할때 이전 행 4개의 위치를 각각 지정할 수 있으면 영상에서처럼 between 할 필요없이 계산이 가능할거 같은데 진행하신 방법이 잘 안와닿습니다..... 2) SQL에서의 자료분석 query가 대체적으로 pandas보다 긴거 같습니다. 취미로 코딩공부해온입장으로 실무를 전혀 모르는데요 제가 지금 당장 데이터분석을 한다면 sql을 데이터를 받아서 python에 임포트 후 pandas로 할거 같아요 실무에서는 어떤가요?? pandas보다 SQL query 작성의 이점이 어떻게 될까요? RDMBS식의 db라면 pandas가 제일 간편할거 같습니다  

안녕하세요. 강의를 보면서 별도로 vscode로 정리하고 있습니다.   궁금한 부분은,   실습자료에서 html 파일강의안을 보면 vscode의 일부분처럼 되어서 코드가 표시되어 있는데 그렇게 작성하려면 어떻게 하는건지 알려 주시면 감사드리겠습니다.

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]안녕하세요 정말 좋은 강의 덕분에 스프링을 재밋게 학습하고 있습니다. 감사합니다.   질문을 드리고 싶은건 Member객체입니다. 저는 개인적인 프로젝트로 강사님의 강의를 실습하고 있습니다. 그런데 보통의 사이트에서는 회원 가입을 할 때와 회원 로그인을 할 때 Member객체를 다르게 사용할 것이라고 생각합니다.(회원 가입할 떄 필요한 정보가 더 많으므로) 그래서 저 또한 MemberSaveForm, MemberLoginForm으로 나눠 사용하려고 하는데 이렇게 하면 MemberRepository의 store에는 MemberSaveForm 객체가 저장이 되서 findByLoginId를 할 때 MemberLoginForm으로 찾지 못하는 문제가 발생합니다. 이럴땐 Member객체라는 Interface를 만들어서 해결을 해야 하는건가요? 아니면 Repository를 하나 더 만들어야 하는건가요?

완전 스마트 포인터로 대체된것도 아니고 결국 raw 포인터가 남아있는데  2번강의에 비해 어떤점이 나아진건지 모르겠습니다.

'hello.hellospring.repository.MemberRepository'의 'findAll()'이(가) 'org.springframework.data.jpa.repository.JpaRepository'의 'findAll()'와(과) 충돌합니다; 메서드에 관련 없는 반환 타입이 있습니다.   인터페이스에 상속받는 부분에서 빨간줄과 함께 이런 에러가 뜹니다.ㅠ

pygame을 이용해 패드 컨트롤러 같은 걸 만드려고 하는데, 방향키만 입력이 되고 스페이스와 나머지 키들은 입력이 안 됩니다. 왜 그럴까요? 코드는 이렇습니다. import pygame import sys import keyboard from pygame.locals import QUIT   pygame.init() pygame.display.set_caption("Test Window") Surface = pygame.display.set_mode((600,600)) FPSCLOCK = pygame.time.Clock()     def main():     while True:         Surface.fill((0,0,0))         c1=255         c2=255         c3=255         c4=255         c5=255         c6=255         c7=255         c8=255         c9=255         for event in pygame.event.get():             if event.type == QUIT:                 pygame.quit()                 sys.exit()         if event.type == pygame.KEYDOWN:              if event.key == pygame.K_LEFT:                  c1 = 100              elif event.key == pygame.K_RIGHT:                  c2 = 20             elif event.key == pygame.K_UP:                  c3 = 80             elif event.key == pygame.K_DOWN:                  c4 = 40             elif event.key == pygame.K_SPACE:                  c5 = 10             elif event.key == pygame.K_w:                  c6 = 75             elif event.key == pygame.K_a:                  c7 = 40             elif event.key == pygame.K_s:                  c8 = 100             elif event.key == pygame.K_d:                  c9 = 200                                   pygame.draw.rect(Surface,(255,c1,255),(15,15,180,180))         pygame.draw.rect(Surface,(c3,255,255),(210,15,180,180))         pygame.draw.rect(Surface,(255,255,c2),(405,15,180,180))         pygame.draw.rect(Surface,(c4,c4,255),(15,210,180,180))         pygame.draw.rect(Surface,(255,c5,c5),(210,210,180,180))         pygame.draw.rect(Surface,(c6,255,c6),(405,210,180,180))         pygame.draw.rect(Surface,(255,c7,c7),(15,405,180,180))         pygame.draw.rect(Surface,(255,c8,c8),(210,405,180,180))         pygame.draw.rect(Surface,(c9,255,255),(405,405,180,180))           pygame.display.update()         FPSCLOCK.tick(120)   if __name__ == '__main__':     main()

왜  having 뒤에 붙는 count 구문에 distinct를 넣어야 하나요? 그냥 count(s.submission_id) 를 넣으면 안되는지 궁금합니다.

BasicErrorController는 자동으로 등록이 된다고 배웠습니다. 그래서 예를 들어 500에러나 400에러가 나면 BasicErrorController에서 error경로의 뷰를 렌더링해준다고 배웠습니다. 하지만 뷰를 렌더링 해줄때 인터셉터가 불필요하게 호출이 되므로 excludePathPatterns로 막아줘야 한다고 배웠습니다.   그렇다면 html관련 오류페이지를 만드는 방법은   1. error경로에 resources/templates/error/500.html resources/templates/error/5xx.html등등 html문서를 만든다. 2. 인터셉터의 불필요한 호출을 막기 위해 excludePathPatterns에 "/error"를 추가한다.  이렇게 2가지 과정인가요??  

먼저 항상 수업 잘 듣고 있고 감사하다고 말씀드리고 싶습니다! 선생님의 수업을 듣고, 혼자서 해당 데이터를 가지고 kaggle에 직접 제출까지 해보고 싶어 데이터 전처리하는 도중 문제가 발생해 질문 드립니다. 강의에서는 train.csv만을 가지고 전처리를 해서 문제가 없었지만, 실제로 제출을 위해선 test.csv도 train.csv 파일과 같이 전처리를 해야한다고 알고 있습니다. one hot encoding 하기 전 train.csv, test.csv의 피처 수는 각각 76, 75로 target 값을 제외하면 같은 수인데, get_dimmies함수를 적용하면 피처 수가 각각 272, 255로 다른 값으로 됩니다. train데이터로 훈련하고 예측을 하려면 test데이터의 피처의 수가 train데이터와 같아야한다고 알고 있는데, 이런 문제는 어떻게 해결해야할까요 그리고 왜 이런 문제가 발생하는 건가요?, 제 추측으로는 각 피처들의 결측 값의 유무로 인해 nan값이 있는 피처들이 컬럼이 하나 더 생겨 차이가 발생하는 것 같은데, 그렇다고 해도 어떻게 해결해야할지 감이 오지 않습니다..답변 기다리겠습니다!!

=========================================[질문 템플릿]1. 강의 내용과 관련된 질문인가요? (예/아니오) 예2. 인프런의 질문 게시판과 자주 하는 질문에 없는 내용인가요? (예/아니오) 예3. 질문 잘하기 메뉴얼을 읽어보셨나요? (예/아니오) 예[질문 내용]여기에 질문 내용을 남겨주세요.   저는 섹션1의 빌드하고 실행하기 강의를 듣고있습니다. 윈도우를 사용하고있고요.   빌드를하기위해 cmd에서 스프링파일경로로가서 gradlew > gradlew.bat > gradlew build 순으로 입력을 하였고 gradlew build를 입력했을때     다음과같은 오류가 생겼습니다.   이렇게 오류가생겨도 build폴더는 만들어지는데 build 폴더안에는 libs폴더가 만들어지지않습니다.   오류가 버젼오류같아보여서 버젼을 많이체크해봤는데 어느부분이 틀린지 잘 모르겠어서 캡쳐를 올려봅니다                     새롭게 프로젝트를 만들어서 해도 같은결과가나옵니다.   문제가 되는부분이 어딘지 알려주시면 감사하겠습니다.

- 학습 관련 질문을 남겨주세요. 상세히 작성하면 더 좋아요! - 먼저 유사한 질문이 있었는지 검색해보세요. - 서로 예의를 지키며 존중하는 문화를 만들어가요. ㄱ- 잠깐! 인프런 서비스 운영 관련 문의는ㄱ 1:1 문의하기를 이용해주세요.   강의 자료 부탁드립니다.

문맥전환-커널소스코드로 본 문맥전환 방법 2가지 1:10부분 내용에서 vTaskDelay() à portYIELD_WITH_API()à portYIELD()à portNVIC_INT_CTRL_REG 값 변경하면 인터럽트를 유발시킨다고 하셨는데 portNVIC_INT_CTRL_REG 값 변경한다고해서 어떻게 인터럽트 핸들러까지 호출하게 되는 과정을 모르겠습니다.    같이 설명하신 부분이 startup 코드쪽에 .weak PendSV_Handler .thumb_set PendSV_Handler, Default_Handler 내용을 언급하셧는데 이 handler 함수(xPortPendSVHandler, PendSV_Handler) 가 어디서 호출이 되는지 잘 모르겠습니다.   

설명해주시는 분이 잘 설명해주셔서 이해가 잘되네요. 감사합니다! 계속해서 영상 보겠습니다

안녕하세요docker-compose.yml 파일 문법 (자료 참고) 로 되어 있는데, 파일문법자료는 첨부되어 있지 않습니다.화면을 캡쳐해서 정리할 수도 있습니다만, 혹시 자료 받을 수 있을 지 문의 드립니다. 감사합니다

안녕하세요. 쌩뚱맞은 질문인데요..   v-for 내부참조의 경우 onMounted 후에 list내의 특정 값을 배열로 받고 있는데요.  이런 기능이 필요한 사용예가 딱히 생각나질 않아서요.