Solioquies

아 2시간 노가다 끝에 가장 긴 대각선 합 말고도 다른 대각선들 우하향 우상향 합도 고려해서 풀었습니다.&nbsp; 감사합니다.

격자판이 5*5에서 꼭 5개를 더해야 답이 되는건가요?

안에 제대로 넣은거 같은데도 잘 안되네요. (사진 처럼 폴더에 그대로 넣었습니다)임포트를 그대로 해봐도 잘 안되고 표시가 저렇게 java resource도 안나오는데 뭐가 문제일까요 ㅠ..



<img src="https://cdn.inflearn.com/public/comments/e88d643b-f09a-41a3-805d-0b8145cbb073/20210622_203117.png" width="1623" height="990" alt="" />




그리고 web.xml이 예제 소스에 없는데 계속 생기네요. 혹시 없어도 되는건가요? 에러부분 뜬다고 계속 떠서 여쭤봅니다.

안녕하세요 질문입니다.

<img src="https://cdn.inflearn.com/public/files/posts/9df60ae2-59a6-4952-b949-539d7bc47bd7/20210604_211624.png" width="1004" height="563" alt="" />

혹시 이러면 성공인건가요.? 윈도우 기반&nbsp; 노트북에서는 안 됐는데 똑같이 조건에 같은 윈도우 기반 데스크탑에서 하니까 successful이랑 저렇게 나오네요. build.gradle에 문제가 있던건가요?

빌드 질문입니다.

<pre style="background-color: #2b2b2b; color: #a9b7c6; font-family: 'JetBrains Mono',monospace; font-size: 9.8pt;">plugins { id 'org.springframework.boot' version '2.5.0' id 'io.spring.dependency-management' version '1.0.11.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' developmentOnly 'org.springframework.boot:spring-boot-devtools' testImplementation 'org.springframework.boot:spring-boot-starter-test' } test { useJUnitPlatform() } 입니다. 만들떄 인텔리제이 프로에서 만들고 강의 따라했습니다.</pre>

아 mysql 커넥터 8 넣으니까 되네요.

디비 연결 질문입니다.

권한 요청입니다.

<img src="https://cdn.inflearn.com/public/files/posts/766452cb-145b-4d57-9c94-6f40d44d31e3/20210401_185419.png" width="1341" height="780" alt="" />
처음부터 강의 들으면서 다시 다 만들고 디비도 8.0버전에서 일부러 강의 맞추려고 5.1버전도 다시 하고 다 했는데
삽질 열심히 했는데&nbsp;&nbsp;
강의 밑에 소스코드랑 임포트 하는 법 강의가 있더라구요..
그래서 일단 강의 쓰던 자료 전부다 복사 붙여넣기해서 써봤는데도 저 부분을 실행하면 사진과 같은 에러가 뜨네요.. 이번엔 에러 문구까지 안 뜨는데 강의에선 insert success가 뜨던데 제 경우에는 안 뜨네요.. 그리고&nbsp; form action="/MVC01/memberInsert.do" 에서 MVC01부분을 꼭 써줘야 동작하나요?&nbsp;

안녕하세요 오류 질문입니다.

어떻게 memberInsertdo 문제는 해결 했는데 이번엔 에러부분에도 한글이 꺠져서 나오네요.. 20번 강의까지는 어떻게 잘 해결했는데 일단 에러로그도 올려봅니다.


<img src="https://cdn.inflearn.com/public/files/posts/7a6880e0-a3a0-47e1-aef6-86aef3158193/20210401_052232.png" width="856" height="428" alt="" />

<pre class="language-html"><code>4월 01, 2021 5:15:06 오전 org.apache.catalina.startup.VersionLoggerListener log
정보: 서버 버전 이름: Apache Tomcat/8.5.50
4월 01, 2021 5:15:06 오전 org.apache.catalina.startup.VersionLoggerListener log
정보: Server 빌드 시각: Dec 7 2019 19:19:46 UTC
4월 01, 2021 5:15:06 오전 org.apache.catalina.startup.VersionLoggerListener log
정보: Server 버전 번호: 8.5.50.0
4월 01, 2021 5:15:06 오전 org.apache.catalina.startup.VersionLoggerListener log
정보: 운영체제 이름: Windows 10
4월 01, 2021 5:15:06 오전 org.apache.catalina.startup.VersionLoggerListener log
정보: 운영체제 버전: 10.0
4월 01, 2021 5:15:06 오전 org.apache.catalina.startup.VersionLoggerListener log
정보: 아키텍처: amd64
4월 01, 2021 5:15:06 오전 org.apache.catalina.startup.VersionLoggerListener log
정보: 자바 홈: C:\Program Files\Java\jdk1.8.0_201\jre
4월 01, 2021 5:15:06 오전 org.apache.catalina.startup.VersionLoggerListener log
정보: JVM 버전: 1.8.0_201-b09
4월 01, 2021 5:15:06 오전 org.apache.catalina.startup.VersionLoggerListener log
정보: JVM 벤더: Oracle Corporation
4월 01, 2021 5:15:06 오전 org.apache.catalina.startup.VersionLoggerListener log
정보: CATALINA_BASE: C:\eGovFrame-3.10.0\workspace.edu\.metadata\.plugins\org.eclipse.wst.server.core\tmp0
4월 01, 2021 5:15:06 오전 org.apache.catalina.startup.VersionLoggerListener log
정보: CATALINA_HOME: C:\eGovFrame-3.10.0\bin\apache-tomcat-8.5.50
4월 01, 2021 5:15:06 오전 org.apache.catalina.startup.VersionLoggerListener log
정보: 명령 행 아규먼트: -Dcatalina.base=C:\eGovFrame-3.10.0\workspace.edu\.metadata\.plugins\org.eclipse.wst.server.core\tmp0
4월 01, 2021 5:15:06 오전 org.apache.catalina.startup.VersionLoggerListener log
정보: 명령 행 아규먼트: -Dcatalina.home=C:\eGovFrame-3.10.0\bin\apache-tomcat-8.5.50
4월 01, 2021 5:15:06 오전 org.apache.catalina.startup.VersionLoggerListener log
정보: 명령 행 아규먼트: -Dwtp.deploy=C:\eGovFrame-3.10.0\workspace.edu\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps
4월 01, 2021 5:15:06 오전 org.apache.catalina.startup.VersionLoggerListener log
정보: 명령 행 아규먼트: -Djava.endorsed.dirs=C:\eGovFrame-3.10.0\bin\apache-tomcat-8.5.50\endorsed
4월 01, 2021 5:15:06 오전 org.apache.catalina.startup.VersionLoggerListener log
정보: 명령 행 아규먼트: -Dfile.encoding=UTF-8
4월 01, 2021 5:15:06 오전 org.apache.catalina.core.AprLifecycleListener lifecycleEvent
정보: 프로덕션 환경들에서 최적의 성능을 제공하는, APR 기반 Apache Tomcat Native 라이브러리가, 다음 java.library.path에서 발견되지 않습니다: [C:\Program Files\Java\jdk1.8.0_201\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\Program Files\Zulu\zulu-8\\bin;C:\Program Files\Zulu\zulu-8\bin\;C:\Program Files\Java\jdk1.8.0_201\bin;C:\Program Files\Amazon Corretto\jdk11.0.7_10\bin;C:\Program Files (x86)\NAT Service;C:\app\cyh12\product\11.2.0\dbhome_1\bin;D:\app\cyh12\product\11.2.0\dbhome_1\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Program Files\Git\cmd;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files\NVIDIA Corporation\NVIDIA NvDLISR;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Program Files\MySQL\MySQL Server 8.0\bin;C:\Program Files\SourceGear\Common\DiffMerge\;D:\github\vcpkg;C:\Gradle\gradle-6.6.1\bin;C:\Program Files\mingw-w64\x86_64-8.1.0-posix-seh-rt_v6-rev0\mingw64\bin;C:\Program Files (x86)\Vim\vim82;C:\MinGW\bin;C:\Program Files\LLVM\bin;C:\Users\cyh12\anaconda3;C:\ProgramData\chocolatey\bin;C:\nodejs\;C:\Program Files\dotnet\;C:\Program Files\Microsoft SQL Server\130\Tools\Binn\;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\170\Tools\Binn\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\WINDOWS\System32\OpenSSH\;C:\Program Files\MySQL\MySQL Server 8.0\bin;C:\Ruby27-x64\bin;C:\Python39\Scripts\;C:\Python39\;C:\Program Files\MySQL\MySQL Shell 8.0\bin\;C:\Users\cyh12\AppData\Local\Microsoft\WindowsApps;C:\Program Files\Bandizip\;C:\Program Files\JetBrains\IntelliJ IDEA 2020.3.2\bin;C:\flutter\bin;C:\Program Files\mingw-w64\x86_64-8.1.0-posix-seh-rt_v6-rev0\mingw64\bin;C:\Program Files\JetBrains\PyCharm Community Edition 2020.2.2\bin;C:\venvs;C:\Users\cyh12\AppData\Local\Programs\Microsoft VS Code\bin;C:\Users\cyh12\AppData\Roaming\npm;C:\Users\cyh12\.dotnet\tools;C:\Users\cyh12\AppData\Local\atom\bin;C:\Program Files\JetBrains\IntelliJ IDEA 2020.3.3\bin;;C:\Program Files\JetBrains\PyCharm 2020.3.5\bin;;C:\Program Files (x86)\ESTsoft\ALSee\x64;.]
4월 01, 2021 5:15:06 오전 org.apache.coyote.AbstractProtocol init
정보: 프로토콜 핸들러 ["http-nio-8080"]을(를) 초기화합니다.
4월 01, 2021 5:15:08 오전 org.apache.tomcat.util.net.NioSelectorPool getSharedSelector
정보: Using a shared selector for servlet write/read
4월 01, 2021 5:15:08 오전 org.apache.coyote.AbstractProtocol init
정보: 프로토콜 핸들러 ["ajp-nio-8009"]을(를) 초기화합니다.
4월 01, 2021 5:15:08 오전 org.apache.tomcat.util.net.NioSelectorPool getSharedSelector
정보: Using a shared selector for servlet write/read
4월 01, 2021 5:15:08 오전 org.apache.catalina.startup.Catalina load
정보: Initialization processed in 1832 ms
4월 01, 2021 5:15:08 오전 org.apache.catalina.core.StandardService startInternal
정보: 서비스 [Catalina]을(를) 시작합니다.
4월 01, 2021 5:15:08 오전 org.apache.catalina.core.StandardEngine startInternal
정보: Starting Servlet Engine: Apache Tomcat/8.5.50
4월 01, 2021 5:15:08 오전 org.apache.jasper.servlet.TldScanner scanJars
정보: 적어도 하나의 JAR가 TLD들을 찾기 위해 스캔되었으나 아무 것도 찾지 못했습니다. 스캔했으나 TLD가 없는 JAR들의 전체 목록을 보시려면, 로그 레벨을 디버그 레벨로 설정하십시오. 스캔 과정에서 불필요한 JAR들을 건너뛰면, 시스템 시작 시간과 JSP 컴파일 시간을 단축시킬 수 있습니다.
4월 01, 2021 5:15:08 오전 org.apache.coyote.AbstractProtocol start
정보: 프로토콜 핸들러 ["http-nio-8080"]을(를) 시작합니다.
4월 01, 2021 5:15:08 오전 org.apache.coyote.AbstractProtocol start
정보: 프로토콜 핸들러 ["ajp-nio-8009"]을(를) 시작합니다.
4월 01, 2021 5:15:08 오전 org.apache.catalina.startup.Catalina start
정보: Server startup in 865 ms
4월 01, 2021 5:15:09 오전 org.apache.catalina.core.StandardWrapperValve invoke
심각: 경로가 [/MVC01]인 컨텍스트의 서블릿 [kr.bit.controller.MemberInsertController]을(를) 위한 Servlet.service() 호출이 예외를 발생시켰습니다.
java.lang.NumberFormatException: null
	at java.lang.Integer.parseInt(Integer.java:542)
	at java.lang.Integer.parseInt(Integer.java:615)
	at kr.bit.controller.MemberInsertController.service(MemberInsertController.java:24)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	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:199)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:543)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:609)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:810)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1623)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
java.sql.SQLException: The server time zone value '���ѹ&alpha;� ǥ�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:129)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:89)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:63)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:73)
	at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:76)
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:836)
	at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:456)
	at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246)
	at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:197)
	at java.sql.DriverManager.getConnection(DriverManager.java:664)
	at java.sql.DriverManager.getConnection(DriverManager.java:247)
	at kr.bit.model.MemberDAO.getConnect(MemberDAO.java:22)
	at kr.bit.model.MemberDAO.memberInsert(MemberDAO.java:34)
	at kr.bit.controller.MemberInsertController.service(MemberInsertController.java:40)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	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:199)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:543)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:609)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:810)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1623)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)
Caused by: com.mysql.cj.exceptions.InvalidConnectionAttributeException: The server time zone value '���ѹ&alpha;� ǥ�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(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61)
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:85)
	at com.mysql.cj.util.TimeUtil.getCanonicalTimezone(TimeUtil.java:132)
	at com.mysql.cj.protocol.a.NativeProtocol.configureTimezone(NativeProtocol.java:2118)
	at com.mysql.cj.protocol.a.NativeProtocol.initServerSession(NativeProtocol.java:2142)
	at com.mysql.cj.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:1310)
	at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:967)
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:826)
	... 31 more
java.lang.NullPointerException
	at kr.bit.model.MemberDAO.memberInsert(MemberDAO.java:39)
	at kr.bit.controller.MemberInsertController.service(MemberInsertController.java:40)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	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:199)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:543)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:609)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:810)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1623)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)
4월 01, 2021 5:16:29 오전 org.apache.catalina.core.StandardWrapperValve invoke
심각: 경로 [/MVC01]의 컨텍스트 내의 서블릿 [kr.bit.controller.MemberInsertController]을(를) 위한 Servlet.service() 호출이, 근본 원인(root cause)과 함께, 예외 [not insert]을(를) 발생시켰습니다.
javax.servlet.ServletException: not insert
	at kr.bit.controller.MemberInsertController.service(MemberInsertController.java:48)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	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:199)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:543)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:609)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:810)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1623)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

</code></pre>

원래 쓰던 mysql의 root아이디와 비밀번호로 cmd로 어떻게 들어갔습니다. 근데 mysql 계정 새로 만들 필요 없이 그냥 원래 아이디 루트 계정에 그대로 따라해도 아무 지장 없나요? 그리고 mysql 버전도 8버전 같은데 버전 달라도 아무 문제 없나요?

자세한 예제랑 답변 정말 감사합니다. 자바로 코테를 준비한지 얼마 안 됐지만 저 comparator 부분을 볼 때마다 계속 어렵고 헷갈렸거든요. 유치하다 하셨는데 오히려 전 이해가 더 잘 되서 좋은 거 같아요. 다른 강의도 얼른 나왔으면 좋겠네요. 답변 감사합니다.

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