The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application오류가 이렇게 나는데..jstl jar파일이 없기 때문에 오류가 난다고 생각하는데요.강사님은 다른 작업 없이 잘되는데, 제가 강사님 따라서 실행하면 이런 오류가 떠서 jar 파일을 web-inf아래 lib 폴더 안에 넣어주면 잘 실행 되는데요, 폴더에 안 넣어주고 바로 실행 해도 잘 되는 비법이 뭔가여

컨테이너생성시에 import가 안되서 pom.xml의 modelVersion, dependency>version을 스프링 버전인 5.0.0으로 바꾸니까 되네요. 맞게한건가요?두개의 버전이 어떤 버전을 뜻하는지 궁금하구요.그리고, build>version은 어떤 버전을 뜻하는지 궁금합니다.

Loading class com.mysql.jdbc.Driver'. This is deprecated. The new driver class iscom.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.Thu Jun 14 00:00:33 KST 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.java.sql.SQLException: The server time zone value '´???¹?±¹ ???ؽ?' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:127)at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:95)at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:87)at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:61)at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:71)at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:76)at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:862)at com.mysql.cj.jdbc.ConnectionImpl.(ConnectionImpl.java:444)at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:230)at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:226)at java.sql.DriverManager.getConnection(Unknown Source)at java.sql.DriverManager.getConnection(Unknown Source)at util.DatabaseUtil.getConnection(DatabaseUtil.java:14)at user.UserDAO.join(UserDAO.java:14)at org.apache.jsp.userJoinAction_jsp._jspService(userJoinAction_jsp.java:139)at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443)at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Unknown Source)Caused by: com.mysql.cj.exceptions.InvalidConnectionAttributeException: The server time zone value '´???¹?±¹ ???ؽ?' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)at java.lang.reflect.Constructor.newInstance(Unknown Source)at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:59)at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:83)at com.mysql.cj.util.TimeUtil.getCanonicalTimezone(TimeUtil.java:128)at com.mysql.cj.protocol.a.NativeProtocol.configureTimezone(NativeProtocol.java:2201)at com.mysql.cj.protocol.a.NativeProtocol.initServerSession(NativeProtocol.java:2225)at com.mysql.cj.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:1391)at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:993)at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:852)... 36 morejava.lang.NullPointerExceptionat user.UserDAO.join(UserDAO.java:15)at org.apache.jsp.userJoinAction_jsp._jspService(userJoinAction_jsp.java:139)at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443)at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Unknown Source)

String dbURL = "jdbc:mysql://localhost:3306/BBS?serverTimezone=UTC";Class.forName("com.mysql.cj.jdbc.Driver");저는 계속해서 -2에 걸려 데이터 베이스 오류가 났습니다.MySQL 은 8.~버전을 이용중이고이제는 com.mysql.jdbc.Driver 에서 com.mysql.cj.jdbc.Driver 로 바뀌었고Time Zone 때문에 구글링 해봤더니String dbURL = "jdbc:mysql://localhost:3306/BBS?serverTimezone=UTC";하라고 나옵니다. 저와 같은 증상이신 분에게 도움이 됬으면 합니다.

response.setContentType("text/html; charset=EUC-KR"); PrintWriter writer = response.getWriter(); writer.print(""); writer.print(""); writer.print(""); writer.print(""); writer.print("Post방식입니다. 따라서 doPost메소드가 호출 되었습니다"); writer.print(""); writer.print(""); 분명 보기와 똑같이 쳣는데도 한글만 깨져요.. 실행 결과가 Post?????. ??? doPost???? ?? ????? 이렇게 나옵니다.. 그리구 실행결과 항상 첫줄에 Served at: /hbk0514 이렇게 나오는데 이건 왜 나오는거죠..? 동영상 강의보면 두겟 메소드 아래 안보이는 소스가 재 이클립스 상에서는 존재합니다. response.getWriter().append("Served at: ").append(request.getContextPath()); 위에 소스코드는 신경 안써두 되나요...?