org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'memberController' defined in file [/Users/jeonghaemin/study/hello-spring/out/production/classes/hello/hellospring/Controller/MemberController.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'springConfig' defined in file [/Users/jeonghaemin/study/hello-spring/out/production/classes/hello/hellospring/SpringConfig.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: org.h2.Driver at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:799) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:228) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1356) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1203) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:556) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:897) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:879) ~[spring-context-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551) ~[spring-context-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) ~[spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) ~[spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:405) ~[spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) ~[spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE] at hello.hellospring.HelloSpringApplication.main(HelloSpringApplication.java:11) ~[classes/:na] Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'springConfig' defined in file [/Users/jeonghaemin/study/hello-spring/out/production/classes/hello/hellospring/SpringConfig.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: org.h2.Driver at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:799) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:228) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1356) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1203) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:556) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:409) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1336) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1176) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:556) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1307) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1227) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:886) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:790) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] ... 20 common frames omitted Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: org.h2.Driver at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:657) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:637) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1336) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1176) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:556) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1307) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1227) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:886) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:790) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] ... 43 common frames omitted Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: org.h2.Driver at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:652) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] ... 57 common frames omitted Caused by: java.lang.IllegalStateException: Cannot load driver class: org.h2.Driver at org.springframework.util.Assert.state(Assert.java:97) ~[spring-core-5.2.12.RELEASE.jar:5.2.12.RELEASE] at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.determineDriverClassName(DataSourceProperties.java:224) ~[spring-boot-autoconfigure-2.3.7.RELEASE.jar:2.3.7.RELEASE] at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.initializeDataSourceBuilder(DataSourceProperties.java:176) ~[spring-boot-autoconfigure-2.3.7.RELEASE.jar:2.3.7.RELEASE] at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration.createDataSource(DataSourceConfiguration.java:43) ~[spring-boot-autoconfigure-2.3.7.RELEASE.jar:2.3.7.RELEASE] at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration$Hikari.dataSource(DataSourceConfiguration.java:85) ~[spring-boot-autoconfigure-2.3.7.RELEASE.jar:2.3.7.RELEASE] 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.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE] ... 58 common frames omitted confg package hello.hellospring; import hello.hellospring.repository.JdbcMemberRepository; import hello.hellospring.repository.MemberRepository; import hello.hellospring.service.MemberService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import javax.sql.DataSource; @Configuration public class SpringConfig { private final DataSource dataSource; @Autowired public SpringConfig(DataSource dataSource) { this.dataSource = dataSource; } @Bean public MemberService memberService() { return new MemberService(memberRepository()); } @Bean public MemberRepository memberRepository() { return new JdbcMemberRepository(dataSource); } } JdbcMemberRepository package hello.hellospring.repository; import hello.hellospring.domain.Member; import org.springframework.jdbc.datasource.DataSourceUtils; import javax.sql.DataSource; import java.sql.*; import java.util.ArrayList; import java.util.List; import java.util.Optional; public class JdbcMemberRepository implements MemberRepository{ private final DataSource dataSource; public JdbcMemberRepository(DataSource dataSource) { this.dataSource = dataSource; } @Override public Member save(Member member) { String sql = "insert into member(name) values(?)"; Connection conn = null; PreparedStatement pstmt = null; ResultSet rs = null; try { conn = getConnection(); pstmt = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS); pstmt.setString(1, member.getName()); pstmt.executeUpdate(); rs = pstmt.getGeneratedKeys(); if (rs.next()) { member.setId(rs.getLong(1)); } else { throw new SQLException("id 조회 실패"); } return member; } catch (Exception e) { throw new IllegalStateException(e); } finally { close(conn, pstmt, rs); } } @Override public Optional<Member> findById(Long id) { String sql = "select * from member where id = ?"; Connection conn = null; PreparedStatement pstmt = null; ResultSet rs = null; try { conn = getConnection(); pstmt = conn.prepareStatement(sql); pstmt.setLong(1, id); rs = pstmt.executeQuery(); if (rs.next()) { Member member = new Member(); member.setId(rs.getLong("id")); member.setName(rs.getString("name")); return Optional.of(member); } else { return Optional.empty(); } } catch (Exception e) { throw new IllegalStateException(e); } finally { close(conn, pstmt, rs); } } @Override public List<Member> findAll() { String sql = "select * from member"; Connection conn = null; PreparedStatement pstmt = null; ResultSet rs = null; try { conn = getConnection(); pstmt = conn.prepareStatement(sql); rs = pstmt.executeQuery(); List<Member> members = new ArrayList<>(); while(rs.next()) { Member member = new Member(); member.setId(rs.getLong("id")); member.setName((rs.getString("name"))); members.add(member); } return members; } catch (Exception e) { throw new IllegalStateException(e); } finally { close(conn, pstmt, rs); } } @Override public Optional<Member> findByName(String name) { String sql = "select * from member where name = ?"; Connection conn = null; PreparedStatement pstmt = null; ResultSet rs = null; try { conn = getConnection(); pstmt = conn.prepareStatement(sql); pstmt.setString(1, name); rs = pstmt.executeQuery(); if (rs.next()) { Member member = new Member(); member.setId(rs.getLong("id")); member.setName(rs.getString("name")); return Optional.of(member); } return Optional.empty(); } catch (Exception e) { throw new IllegalStateException(e); } finally { close(conn, pstmt, rs); } } private Connection getConnection() { return DataSourceUtils.getConnection(dataSource); } private void close(Connection conn, PreparedStatement pstmt, ResultSet rs) { try { if (rs != null) { rs.close(); } } catch (SQLException e) { e.printStackTrace(); } try { if (pstmt != null) { pstmt.close(); } }catch (SQLException e) { e.printStackTrace(); } try { if (conn != null) { close(conn); } }catch (SQLException e) { e.printStackTrace(); } } private void close(Connection conn) throws SQLException { DataSourceUtils.releaseConnection(conn, dataSource); } } application.properties spring.datasource.driver-class-name=org.h2.Driver spring.datasource.url=jdbc:h2:tcp://localhost/~/test spring.datasource.username=sa build.gradle plugins { id 'org.springframework.boot' version '2.3.7.RELEASE' id 'io.spring.dependency-management' version '1.0.10.RELEASE' id 'java' } group = 'hello' version = '0.0.1-SNAPSHOT' sourceCompatibility = '11' repositories { mavenCentral() } dependencies { implementation 'org.springframework.boot:spring-boot-starter-thymeleaf' implementation 'org.springframework.boot:spring-boot-starter-web' implementation 'org.springframework.boot:spring-boot-starter-jdbc' runtimeOnly 'com.h2database:h2' testImplementation('org.springframework.boot:spring-boot-starter-test') { exclude group: 'org.junit.vintage', module: 'junit-vintage-engine' } } test { useJUnitPlatform() } 안녕하세요 영한님 강의 정말 잘 듣고 있습니다.  실습 중에 위와 같이 org.h2.Driver 드라이버 클래스를 불러올 수 없다는 에러가 발생하였는데 구글링을 해봐도 명확한 답을 찾지를 못하여 질문 드립니다!!

안녕하세요. 현재 웹 데이터 가져오기 강의를 듣고 있는데, "데이터 가져오기" 에서 "연결만 만들기" 첨부와 같이 비활성화 되어있습니다. 활성화 하는 방법 알려주실 수 있을까요? 감사합니다!

Grep Console 플러그인을 깔아서 콘솔창 색을 좀 바꿔봤는데 강사님처럼 로그 한줄에 이런색 저런색 섞어서 나오는걸 어떻게 하는지 모르겠습니다 .. 굳이 답변 안주셔도 괜찮습니다 !!!..

github를 처음 다루어 봅니다. 강사님이 권한을 부여한 후에, 수강생은 어떻게 접근합니까? 자세히 알려주세요...ㅠ.ㅜ

print 명령어를 치면, 밑에 설명이 영어로 나와야 하는데, 저는 안나옵니다ㅠㅠ 사용자도 영어인데, 왜 안나오는걸까요? 플러그인을 잘못설치한걸까요?

안녕하세요 목마님! Exposure Control 목록에 mr photographic이 없을 때는 어떡하나용? 위 사진이 제 화면입니다!!

#include<iostream> #include<algorithm> #include<cstdio> #include<vector> #include<cmath> #include<stack> using namespace std; int n; vector<int> v(11); int re,cnt; void dp(int k,int sum){ if(k==n+1){ if(sum==re) cnt++; } else{ dp(k+1,sum+v[k]); dp(k+1,sum); dp(k+1,sum-v[k]); } } int main(void){ int n; cin >> n >> re; for(int i=1;i<=n;i++){ cin >> v[i]; } dp(1,0); if(cnt==0) cout<<"-1"; else cout << cnt; return 0; } 제가 짠 코드입니다. 순서도 정답과 같이 햇습니다. 그런데 왜 이건 답이 안나오는지 모르겠습니다.

안녕하세요 강사님!. 다름이 아니라, 기존 자바 14설치되어있었는데, 14를 삭제하고, 자바 11을 설치하고 나서 프로젝트를 생성하였는데, 실행버튼 자체가 실행이 되지 않아서 질문드립니다..... 그리고 제가 조금 별별 시도를 다 해봤는데, 오른쪽 위의 초록색 망치모양을 클릭한 다음에 해당 파일 위치를 복사 붙이기 해서 했습니다. 그러니까 실행버튼은 눌러지나, 실행이 제대로 되지 않고, 아래와 같이 오류가 뜹니다.. Project directory 'C:\Users\user\hello-spring\hello-spring\src\main\java\hello\hellospring' is not part of the build defined by settings file 'C:\Users\user\hello-spring\hello-spring\settings.gradle'. If this is an unrelated build, it must have its own settings file. * 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. 다음에

https://blog.naver.com/um314567/222181024638 제 블로그에 궁금한 점 올려 놓았습니다 위에 사진은 강의 내용이구요 아래 사진은 제 로컬에서 send 했을 때 msg:유저가 존재하지 않는다고 뜹니다 어떤 부분이 누락됐는지 확인을 해야 할까요??강사님 답변 부탁드립니다ㅠㅠ

안녕하세요 강사님! 강의 잘 듣고 있습니다. 궁금한 점이 Team과 Member, TeamId를 persist를 하고  find를 사용해 Member를 통해서 Team을 조회하려고하는데 잘 되지않아 persist를 했더니 가능했습니다. persist를 하지 않으니 쿼리문도 나가지 않더라구요.. 직접 find를 사용해 Member를 조회할때는 가능한 걸 확인했는데 왜 persist를 사용해야만 가능한지 궁금합니다.

TCP의 특징중 3-way-handshake에서 클라이언트와 서버가 연결이 확인 된 후  3단계 혹은 4단계에서 데이터를 전송할 수 있다고 설명해 주셨는데, TCP/IP 패킷 정보 장표에서 전송 데이터를 포함한 여러가지 정보들이 패킷으로 나가는게 이해가 안됩니다.. 데이터를 주고 받기전 상호 확인단계에서는 TCP/IP 패킷을 주고 받는게 아닌 다른 신호를 주고 받는 것인가요?

현재 강의를 통해 C#을 배우고 있는데 Rookies님의 추후 예정 강의에서는 C++을 다룰 예정이며 취업 목적의 강의를 진행하신다는 글을 봤습니다. 취업 목적으로 하려면 C#보다는 C++을 먼저 배워야 할까요? 아니면 단순히 엔진에 따른 언어차이라서 업계 선호의 차이가 없나요?

vector을 정렬할 때 n=1부터 시작하면  sort(v.begin(),v.end()); 가 적용이 안되더라구요 그 이유는 v.begin()이 v[0]과  같기 때문이라고 생각합니다. 그래서 v.begin()+4로 해서 해보았는데 정렬이 되지 않습니다. 혹시 vector가 n=1부터 시작할 경우에 정렬할 수 있는 방법이 있을까요?

(사진)

수업 내용을 쭉 따라가보니 저의  Local : http://localhost:8081/ 이라고 되어있고 Network: unavailable 이라고 되어있는데, 초급강좌때 선생님께서 8081로 되어 있어서 뭔가를 끄고 8080으로 맞춰준다고 했던 기억이 있는데, 어디서 확인을 할 수 있는건가요? 그리고 선생님 화면에는 항상 network도 주소가 나와 있는데  왜 제꺼는 사용할수 없다고 나와있는건가요?? 

C# 하고 java가 다르다는 건 아는데 이 개념 관해서 문의하고 싶습니다. this.hp 같이 명확하게 어떤 knight의 hp를 가져와 써라 안 해도 상관이 없는 문제일까요? 혹시나 싶어 this.knight.hp를 쓰니 오류가 생겨 문의합니다.

안녕하세요 강사님 !!!  강의를 듣던중 람다와 함께 Optional에 대해 궁금한점이 있는데요  Optional을 쓰는 이유가 NPE를 피하기 위해서 인가요 ?? 만약 피하더라도 "NoSuchElementException" 이 발생할 수 있다고 보는데  굳이 사용하는 이유가 잘 와 닿지가 않습니다 !

DI가 제가 이해하기론 객체와 객체간의 결합성을 타이트하지 않게 하고       ex) 의존객체를 new 객체() 로 직접 선언하지 않고  파라미터로 받아서 언제든지 갈아 끼울수 있게                   -> new 로 직접 선언하면 수정이 필요한 경우 해당 객체를 의존하고 있는 클래스내의 코드를 모두 바꿔야하는 문제가 생기므로  파라미터로 받겠금 ... IOC는 코드내에 제어권을 가지고 있지않고 스프링에게 제어권을 주어  수정이 필요할 경우 xml 이던 자바로 만든  Config 파일에서 수정 해서 코드내용을 수정하지 않게     ex) bean 객체만 변경 하도록 로 이해했는데 맞나요 ..?

가계부 파일이 없습니다.

KFold 교차 검증을 수행하는 코드에서 반복을 5번 하면 학습과 예측도 5번 하잖아요? 그때 이전 반복문의 결과가 이후 반복문의 결과에 영향을 주나요? 1. 그러니까 만약에 영향을 안 준다면 마지막 학습 1번만 하는 것과 다름이 없는데 왜 여러 번 학습을 수행시키는지 궁금합니다. 2. 만약에 영향을 준다면 0.7542 -> 0.78.9 -> 0.7865 -> 0.7697 -> 0.8202 가 우연이 숫자가 증가하는 양상을  띄는 것이아니라 정말로 성능이 좋아지는 것이 맞나요? 만약에 그렇다면 최종 정확도가 중요한 것인데 왜 평균 정확도를 구하나요? 3. 영향을 준다면 2.6 사이킷런에서 수행하는 타이타닉 생존자 예측 코드에서 DecisionTreeClassifier, RandomForestClassifier, LogisticRegression으로 학습/예측/평가를 해본 뒤, KFold 교차 검증에서 앞서 사용한 df_clf를 함수에 인자로 넘겨 재사용하는데, 이것이 문제 없는 것인지 궁금합니다.