ㅜ ㅜ

강사님 안녕하세요 :) 좋은 강의, 항상 감사드립니다. 다름아니라 웹 모바일 페이지 실습하면서 display: none으로 화면에서 가리는 방법과 클래스 blind로 position 처리해서 가리는 방법을 번갈아 가며 쓰시는거 같은데 혹시 이유가 있을까요?

config객체 실습 파일 web.xml과 jspEx.jsp 파일 실행 시 코드에 아무런 문제가 있지 않은데 실행이 안되고 Origin 서버가 대상 리소스를 위한 현재의 representation을 찾지 못했거나, 그것이 존재하는지를 밝히려 하지 않습니다. 라고 설명이 뜨네요. 다른 jsp파일이나 java파일은 실행이 되는데 저 파일만 실행이 안되는데 무엇이 문제인가요?

수업도중에 vector = column 이라고 하는데 칼럼자체가 어떤건지 모르겠습니다 ! 

stack에서 mage는 struct구조체로 복사하여 사용하고 mage와 mage2는 각각 다른 본체라서 서로 hp가 다르게 나온다. knight2.hp = knight knight.hp = 0 으로 kinght의 hp와 knight2의 hp를 서로 다르게 할려했지만 heap의 같은 본체의 주소를 사용하기때문에 kinght의 hp도 똑같이 0이 되어버렸고, Knight knight = new Kinght() 로 했을때는 heap에서 새로운 영역을 할당받아서 knigh2라는 heap의 새롭게 만들어진 영역의 본체주소를 사용해서 knight와 knight2 라는 각각 다른 개체를 만들수 있었다 라는게 제가 이해한 내용인데 그럼 mage와 mage2는 heap에는 아무런 영역이 없고 stack내에서만 사용되는 각각의 본체가 맞는지 궁금합니다.

(venv) λ python manage.py makemigrations Traceback (most recent call last):   File "manage.py", line 21, in <module>     main()   File "manage.py", line 17, in main     execute_from_command_line(sys.argv)   File "C:\Users\user\Desktop\Github\Hyeon_Jong_Django\venv\lib\site-packages\django\core\management\__init__.py", line 401, in execute_from_command_line     utility.execute()   File "C:\Users\user\Desktop\Github\Hyeon_Jong_Django\venv\lib\site-packages\django\core\management\__init__.py", line 377, in execute     django.setup()   File "C:\Users\user\Desktop\Github\Hyeon_Jong_Django\venv\lib\site-packages\django\__init__.py", line 24, in setup     apps.populate(settings.INSTALLED_APPS)   File "C:\Users\user\Desktop\Github\Hyeon_Jong_Django\venv\lib\site-packages\django\apps\registry.py", line 114, in populate     app_config.import_models()   File "C:\Users\user\Desktop\Github\Hyeon_Jong_Django\venv\lib\site-packages\django\apps\config.py", line 211, in import_models     self.models_module = import_module(models_module_name)   File "C:\Users\user\Anaconda3\lib\importlib\__init__.py", line 127, in import_module     return _bootstrap._gcd_import(name[level:], package, level)   File "<frozen importlib._bootstrap>", line 1006, in _gcd_import   File "<frozen importlib._bootstrap>", line 983, in _find_and_load   File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked   File "<frozen importlib._bootstrap>", line 677, in _load_unlocked   File "<frozen importlib._bootstrap_external>", line 728, in exec_module   File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed   File "C:\Users\user\Desktop\Github\Hyeon_Jong_Django\venv\lib\site-packages\django\contrib\auth\models.py", line 2, in <module>     from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager   File "C:\Users\user\Desktop\Github\Hyeon_Jong_Django\venv\lib\site-packages\django\contrib\auth\base_user.py", line 47, in <module>     class AbstractBaseUser(models.Model):   File "C:\Users\user\Desktop\Github\Hyeon_Jong_Django\venv\lib\site-packages\django\db\models\base.py", line 121, in __new__     new_class.add_to_class('_meta', Options(meta, app_label))   File "C:\Users\user\Desktop\Github\Hyeon_Jong_Django\venv\lib\site-packages\django\db\models\base.py", line 325, in add_to_class     value.contribute_to_class(cls, name)   File "C:\Users\user\Desktop\Github\Hyeon_Jong_Django\venv\lib\site-packages\django\db\models\options.py", line 208, in contribute_to_class     self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())   File "C:\Users\user\Desktop\Github\Hyeon_Jong_Django\venv\lib\site-packages\django\db\__init__.py", line 28, in __getattr__     return getattr(connections[DEFAULT_DB_ALIAS], item)   File "C:\Users\user\Desktop\Github\Hyeon_Jong_Django\venv\lib\site-packages\django\db\utils.py", line 207, in __getitem__     backend = load_backend(db['ENGINE'])   File "C:\Users\user\Desktop\Github\Hyeon_Jong_Django\venv\lib\site-packages\django\db\utils.py", line 111, in load_backend     return import_module('%s.base' % backend_name)   File "C:\Users\user\Anaconda3\lib\importlib\__init__.py", line 127, in import_module     return _bootstrap._gcd_import(name[level:], package, level)   File "C:\Users\user\Desktop\Github\Hyeon_Jong_Django\venv\lib\site-packages\django\db\backends\sqlite3\base.py", line 14, in <module>     from sqlite3 import dbapi2 as Database   File "C:\Users\user\Anaconda3\lib\sqlite3\__init__.py", line 23, in <module>     from sqlite3.dbapi2 import *   File "C:\Users\user\Anaconda3\lib\sqlite3\dbapi2.py", line 27, in <module>     from _sqlite3 import * ImportError: DLL load failed: 지정된 모듈을 찾을 수 없습니다.

강의 정말 좋아요 ^^   선생님 JSP ,SPRING강의 하시면 대박날텐데 강의좀 올려주세요 ?^^

내용을 못보신것 같아서 다시 글을 남깁니다. ^^  한가지 더 궁금한 점이 있는데요. 구독자 수 만큼 모스키토를 실행해야하는데요. 자동으로 모스키토서버 및 구독자를 실행하는 방법이 없을까요? 만약 온도센서가 50개 가량 된다면 1개의 모스키토 서버 실행과 50개의 구독자를 만들어야하는데 명령프롬프트창에서 실행하는 것이 힘든 것 같아서요 ^^ 그리고 만약에 창이 실수로 꺼지게 된다면 또 50개의 구독자를 실행시켜야하는데 너무 번거로운 작업이 될 것 같습니다.

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.