현재는 back 아래에  lambda 폴더에 index 로 사용이 되었는데, 만약 함수가 여러개 사용이 된다면 lambda 폴더 아래 함수명 폴더 아래 index.js 를 놓고 수정시나, 생성시 각각의 폴더에서 동일하게 사용하나요?

안녕하세요, 선생님! 지금까지 DFS 문제들에서는 뻗기 전에 체크 걸어주고 돌아온후에 체크 풀어준다라고 암기하듯 외웠는데요, 이 문제는 들어가서 처음에 한번 걸어주고 풀지않는데요. 그 이유는 사다리 타기의 경우 답이 한 경로만 존재하고 위로만 올라가기 때문인지요?

패턴 직접 구현 중 MyClassA,MyClassB에 있는 Publisher observerble; 부분이 있어야 하는 이유가 있을까요?

create-react-app으로 만들어서 진행하는거  맞죠? 그리고 src 파일 원래 있던 것 중에서 이름하고 내용 바꾸는 식으로 하신건가요? 

안녕하세요. 저는 주로 css파일을 html에다 설정해주는데요, 그러면 css-loader나 style-loader는 딱히 필요 없는건가요? 저의 경우에는 스크립트에 css를 임포트하는 일이 없어서, 보통 어떤 경우에 이 두가지 로더를 사용하면 도움이 되는 건지 궁금합니다! 또, 나중에 플러그인에 나오는 MiniCssExtractPlugin을 사용하면 css파일을 한데 모아주고 자동으로 html에 설정 구문을 넣어주니까 그 때를 위해서 css-loader+MiniCssExtractPlugin조합으로 사용하는 경우에는 유용할 것 같은데요, 보통은 웹팩 구성할 때 이런 식으로 설정을 하는 것인지(?) 궁금합니다 !!

에로우 스코프는 함수선언문처럼은 못하나요? 보면 함수표현식처럼 if(true){   d()  // Uncaught TypeError: d is not a function   var d = () => {   console.log( true )   } } d() //true 이렇게 할당하는데 이렇게 하면은 이렇게 나오는데 함수표현식이여서 전역컨텍스트에 var d; 만 선언되고  함수는 할당이 안되서 에러가 나오는데 'use strict' if (true) {   a() //true   function a () { console.log(true) } } 이렇게 블록스코프에 같인 함수선언문은  true가 나오는데  왜 arrow function 쓰라는지 조금만 더 설명 부탁드려도 될까요 

이 강의를 다 듣고 월드에 있는 아이템을 먹으면 인벤토리 창에 추가할려는 기능을 구현하고 있습니다.근데 제가 아이템을 prefab으로 저장하고 그 해당 prefab를 드래그앤드롭해서 월드에 위치시켜줬습니다. 월드에서 플레이어가 아이템을 먹으면 플레이어가 가지고 있는 스크립트 list에 추가한 후에 월드에 있는 아이템은 사라지도록 Destory를 했습니다.일단 리스트에 size가 늘어나는거 보면 들어오기는 하는데.. Destory를 해서 그런지 해당 리스트에 담긴것이 없어지면서 missing으로 나옵니다ㅠㅠ. 혹시 방법이 있을까요??..

단위 테스트가 훨씬 좋은 테스트일 가능성이 높다고 하셨는데, 그렇다면 db를 연동하고 난 후에는 단위테스트를 어떻게 진행하면 되는 건가요?

삭제된 글입니다

선생님과 똑같이 했는데 뭐가 잘못되었을까요? import openpyxl excel_file = openpyxl.Workbook() excel_sheet = excel_file.active excel_sheet.append(['data1', 'data2', 'data3']) excel_file.save('tmp.xlsx') excel_file.close() NameError Traceback (most recent call last) <ipython-input-2-ceee3ced2775> in <module> ----> 1 excel_file.close() NameError: name 'excel_file' is not defined

안녕하세요 선생님. class MyList<T> where T : Monster  // T는 반드시 Monster 혹은 Monster를 상속받은 클래스여야 한다. 이 설명이 이해가 안가는데 T가 Monster 타입이어야되는 조건이 있는데 그럼 왜 모든 타입을 받을 수 있는 제너릭으로 만든건가요??

아래 처럼 제네릭을 이용해 union을 제거했는데 option.value = item.value.toString(); option.innerText = item.value.toString(); 이부분에서 toString에 `T형식에는 toString 속성이 없습니다`라는 에러가 나옵니다. 찾아봐도 해결하는 방법을 몰라서 어떻게 해야하는지 질문드립니다. function createDropdownItem<T>(item: DropDownItem<T>) { const option = document.createElement('option'); option.value = item.value.toString(); option.innerText = item.value.toString(); option.selected = item.selected; return option; } emails.forEach(function (email) { const item = createDropdownItem<string>(email); const selectTag = document.querySelector('#email-dropdown'); selectTag?.appendChild(item); });

뷰를 처음 공부하고 있습니다. 어느정도 공부하다보니 SEO 문제를 접하게 되었는데요... SEO문제를 해결하기 위해 nuxt를 사용하면 운영서버가 꼭 node.js 환경이어야 하나요? 클라이언트 요구 사항으로 일반 홈페이지를 vue로 개발하는 상황인데 백엔드는 자바로 개발될겁니다. 기존의 홈페이지도 현재 자바로 개발되서 운영중이구요. 이걸 리뉴얼 하면서 vue로 프론트를 개발해 달라고 해서 현재 열심히 공부중인데 SEO처리를 어떻게 해야하나 궁금해집니다. 사실 vue관련 강의 이것저것 거의다  듣고 이 강의는 nuxt 가 궁금해서 수강하게 되었습니다. 이 강의는 아직 초반만 들은 상태입니다. 다시 질문으로 돌아와서 현재 자바로 운영되고 있는 홈페이지의 프론트를 vue로 개발하려는데 nuxt를 사용하면 배포시 운영서버에 꼭 node.js 환경이 갖춰져야 하나요? 아니면 프론트 개발할때만 node js 환경에서 하면 되는건가요?

pdf 뿐만 아니라 사내 프로그램에서 항목 select가 안 되는 경우에는 어떻게 처리해야 하나요? 

13강을 따라하고 있는데 아래와 같은 에러가 발생합니다. 제가 강의를 듣는 환경은 STS4 를 사용하고 있고, JDBC API와 Oracle Driver를 같이 선택해서 프로젝트를 생성했고,  강의 Sample 그대로를 따라서 작성 후 내장 서버를 실행시키면 아래와 같은 에러가 발생합니다. 무엇이 잘 못 된 걸까요?  OpenJDK 64-Bit Server VM warning: Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.   .   ____          _            __ _ _  /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \  \\/  ___)| |_)| | | | | || (_| |  ) ) ) )   '  |____| .__|_| |_|_| |_\__, | / / / /  =========|_|==============|___/=/_/_/_/  :: Spring Boot ::        (v2.3.4.RELEASE) 2020-10-27 09:13:24.957  INFO 13156 --- [           main] c.s.s.Ex13JdbcTemplate1Application       : Starting Ex13JdbcTemplate1Application on LCSC05V395 with PID 13156 (C:\workspace\Ex13_JdbcTemplate1\bin\main started by 26114 in C:\workspace\Ex13_JdbcTemplate1) 2020-10-27 09:13:24.959  INFO 13156 --- [           main] c.s.s.Ex13JdbcTemplate1Application       : No active profile set, falling back to default profiles: default 2020-10-27 09:13:26.043  INFO 13156 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8081 (http) 2020-10-27 09:13:26.058  INFO 13156 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat] 2020-10-27 09:13:26.058  INFO 13156 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.38] 2020-10-27 09:13:26.383  WARN 13156 --- [           main] o.a.tomcat.util.scan.StandardJarScanner  : Failed to scan [file:/C:/Users/xxxxx/.gradle/caches/modules-2/files-2.1/com.oracle.database.jdbc/ojdbc8/19.3.0.0/967c0b1a2d5b1435324de34a9b8018d294f8f47b/oraclepki.jar] from classloader hierarchy java.io.IOException: java.lang.reflect.InvocationTargetException at org.apache.tomcat.util.compat.Jre9Compat.jarFileNewInstance(Jre9Compat.java:205) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.JarFileUrlJar.<init>(JarFileUrlJar.java:65) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.JarFactory.newInstance(JarFactory.java:49) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.StandardJarScanner.process(StandardJarScanner.java:383) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.StandardJarScanner.processURLs(StandardJarScanner.java:318) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.StandardJarScanner.doScanClassPath(StandardJarScanner.java:282) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.StandardJarScanner.scan(StandardJarScanner.java:233) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.jasper.servlet.TldScanner.scanJars(TldScanner.java:262) ~[tomcat-embed-jasper-9.0.38.jar:9.0.38] at org.apache.jasper.servlet.TldScanner.scan(TldScanner.java:104) ~[tomcat-embed-jasper-9.0.38.jar:9.0.38] at org.apache.jasper.servlet.JasperInitializer.onStartup(JasperInitializer.java:83) ~[tomcat-embed-jasper-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5128) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na] at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) ~[na:na] at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:843) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na] at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) ~[na:na] at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.startup.Tomcat.start(Tomcat.java:486) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:123) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:104) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:437) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:191) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:178) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:158) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:545) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at com.study.springboot.Ex13JdbcTemplate1Application.main(Ex13JdbcTemplate1Application.java:10) ~[main/:na] Caused by: java.lang.reflect.InvocationTargetException: null at java.base/jdk.internal.reflect.GeneratedConstructorAccessor16.newInstance(Unknown Source) ~[na:na] at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na] at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500) ~[na:na] at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481) ~[na:na] at org.apache.tomcat.util.compat.Jre9Compat.jarFileNewInstance(Jre9Compat.java:202) ~[tomcat-embed-core-9.0.38.jar:9.0.38] ... 47 common frames omitted Caused by: java.nio.file.NoSuchFileException: C:\Users\26114\.gradle\caches\modules-2\files-2.1\com.oracle.database.jdbc\ojdbc8\19.3.0.0\967c0b1a2d5b1435324de34a9b8018d294f8f47b\oraclepki.jar at java.base/sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:85) ~[na:na] at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:103) ~[na:na] at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:108) ~[na:na] at java.base/sun.nio.fs.WindowsFileAttributeViews$Basic.readAttributes(WindowsFileAttributeViews.java:53) ~[na:na] at java.base/sun.nio.fs.WindowsFileAttributeViews$Basic.readAttributes(WindowsFileAttributeViews.java:38) ~[na:na] at java.base/sun.nio.fs.WindowsFileSystemProvider.readAttributes(WindowsFileSystemProvider.java:198) ~[na:na] at java.base/java.nio.file.Files.readAttributes(Files.java:1843) ~[na:na] at java.base/java.util.zip.ZipFile$Source.get(ZipFile.java:1160) ~[na:na] at java.base/java.util.zip.ZipFile$CleanableResource.<init>(ZipFile.java:717) ~[na:na] at java.base/java.util.zip.ZipFile.<init>(ZipFile.java:237) ~[na:na] at java.base/java.util.zip.ZipFile.<init>(ZipFile.java:167) ~[na:na] at java.base/java.util.jar.JarFile.<init>(JarFile.java:347) ~[na:na] ... 52 common frames omitted 2020-10-27 09:13:26.385  WARN 13156 --- [           main] o.a.tomcat.util.scan.StandardJarScanner  : Failed to scan [file:/C:/Users/xxxxx/.gradle/caches/modules-2/files-2.1/com.oracle.database.security/oraclepki/19.3.0.0/e52a34f271c6c62ee1a73b71cc19da5459b709f/osdt_core.jar] from classloader hierarchy java.io.IOException: java.lang.reflect.InvocationTargetException at org.apache.tomcat.util.compat.Jre9Compat.jarFileNewInstance(Jre9Compat.java:205) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.JarFileUrlJar.<init>(JarFileUrlJar.java:65) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.JarFactory.newInstance(JarFactory.java:49) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.StandardJarScanner.process(StandardJarScanner.java:383) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.StandardJarScanner.processURLs(StandardJarScanner.java:318) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.StandardJarScanner.doScanClassPath(StandardJarScanner.java:282) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.StandardJarScanner.scan(StandardJarScanner.java:233) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.jasper.servlet.TldScanner.scanJars(TldScanner.java:262) ~[tomcat-embed-jasper-9.0.38.jar:9.0.38] at org.apache.jasper.servlet.TldScanner.scan(TldScanner.java:104) ~[tomcat-embed-jasper-9.0.38.jar:9.0.38] at org.apache.jasper.servlet.JasperInitializer.onStartup(JasperInitializer.java:83) ~[tomcat-embed-jasper-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5128) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na] at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) ~[na:na] at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:843) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na] at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) ~[na:na] at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.startup.Tomcat.start(Tomcat.java:486) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:123) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:104) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:437) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:191) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:178) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:158) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:545) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at com.study.springboot.Ex13JdbcTemplate1Application.main(Ex13JdbcTemplate1Application.java:10) ~[main/:na] Caused by: java.lang.reflect.InvocationTargetException: null at java.base/jdk.internal.reflect.GeneratedConstructorAccessor16.newInstance(Unknown Source) ~[na:na] at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na] at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500) ~[na:na] at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481) ~[na:na] at org.apache.tomcat.util.compat.Jre9Compat.jarFileNewInstance(Jre9Compat.java:202) ~[tomcat-embed-core-9.0.38.jar:9.0.38] ... 47 common frames omitted Caused by: java.nio.file.NoSuchFileException: C:\Users\26114\.gradle\caches\modules-2\files-2.1\com.oracle.database.security\oraclepki\19.3.0.0\e52a34f271c6c62ee1a73b71cc19da5459b709f\osdt_core.jar at java.base/sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:85) ~[na:na] at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:103) ~[na:na] at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:108) ~[na:na] at java.base/sun.nio.fs.WindowsFileAttributeViews$Basic.readAttributes(WindowsFileAttributeViews.java:53) ~[na:na] at java.base/sun.nio.fs.WindowsFileAttributeViews$Basic.readAttributes(WindowsFileAttributeViews.java:38) ~[na:na] at java.base/sun.nio.fs.WindowsFileSystemProvider.readAttributes(WindowsFileSystemProvider.java:198) ~[na:na] at java.base/java.nio.file.Files.readAttributes(Files.java:1843) ~[na:na] at java.base/java.util.zip.ZipFile$Source.get(ZipFile.java:1160) ~[na:na] at java.base/java.util.zip.ZipFile$CleanableResource.<init>(ZipFile.java:717) ~[na:na] at java.base/java.util.zip.ZipFile.<init>(ZipFile.java:237) ~[na:na] at java.base/java.util.zip.ZipFile.<init>(ZipFile.java:167) ~[na:na] at java.base/java.util.jar.JarFile.<init>(JarFile.java:347) ~[na:na] ... 52 common frames omitted 2020-10-27 09:13:26.387  WARN 13156 --- [           main] o.a.tomcat.util.scan.StandardJarScanner  : Failed to scan [file:/C:/Users/xxxxx/.gradle/caches/modules-2/files-2.1/com.oracle.database.security/oraclepki/19.3.0.0/e52a34f271c6c62ee1a73b71cc19da5459b709f/osdt_cert.jar] from classloader hierarchy java.io.IOException: java.lang.reflect.InvocationTargetException at org.apache.tomcat.util.compat.Jre9Compat.jarFileNewInstance(Jre9Compat.java:205) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.JarFileUrlJar.<init>(JarFileUrlJar.java:65) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.JarFactory.newInstance(JarFactory.java:49) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.StandardJarScanner.process(StandardJarScanner.java:383) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.StandardJarScanner.processURLs(StandardJarScanner.java:318) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.StandardJarScanner.doScanClassPath(StandardJarScanner.java:282) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.StandardJarScanner.scan(StandardJarScanner.java:233) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.jasper.servlet.TldScanner.scanJars(TldScanner.java:262) ~[tomcat-embed-jasper-9.0.38.jar:9.0.38] at org.apache.jasper.servlet.TldScanner.scan(TldScanner.java:104) ~[tomcat-embed-jasper-9.0.38.jar:9.0.38] at org.apache.jasper.servlet.JasperInitializer.onStartup(JasperInitializer.java:83) ~[tomcat-embed-jasper-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5128) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na] at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) ~[na:na] at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:843) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na] at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) ~[na:na] at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.startup.Tomcat.start(Tomcat.java:486) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:123) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:104) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:437) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:191) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:178) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:158) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:545) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at com.study.springboot.Ex13JdbcTemplate1Application.main(Ex13JdbcTemplate1Application.java:10) ~[main/:na] Caused by: java.lang.reflect.InvocationTargetException: null at java.base/jdk.internal.reflect.GeneratedConstructorAccessor16.newInstance(Unknown Source) ~[na:na] at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na] at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500) ~[na:na] at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481) ~[na:na] at org.apache.tomcat.util.compat.Jre9Compat.jarFileNewInstance(Jre9Compat.java:202) ~[tomcat-embed-core-9.0.38.jar:9.0.38] ... 47 common frames omitted Caused by: java.nio.file.NoSuchFileException: C:\Users\26114\.gradle\caches\modules-2\files-2.1\com.oracle.database.security\oraclepki\19.3.0.0\e52a34f271c6c62ee1a73b71cc19da5459b709f\osdt_cert.jar at java.base/sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:85) ~[na:na] at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:103) ~[na:na] at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:108) ~[na:na] at java.base/sun.nio.fs.WindowsFileAttributeViews$Basic.readAttributes(WindowsFileAttributeViews.java:53) ~[na:na] at java.base/sun.nio.fs.WindowsFileAttributeViews$Basic.readAttributes(WindowsFileAttributeViews.java:38) ~[na:na] at java.base/sun.nio.fs.WindowsFileSystemProvider.readAttributes(WindowsFileSystemProvider.java:198) ~[na:na] at java.base/java.nio.file.Files.readAttributes(Files.java:1843) ~[na:na] at java.base/java.util.zip.ZipFile$Source.get(ZipFile.java:1160) ~[na:na] at java.base/java.util.zip.ZipFile$CleanableResource.<init>(ZipFile.java:717) ~[na:na] at java.base/java.util.zip.ZipFile.<init>(ZipFile.java:237) ~[na:na] at java.base/java.util.zip.ZipFile.<init>(ZipFile.java:167) ~[na:na] at java.base/java.util.jar.JarFile.<init>(JarFile.java:347) ~[na:na] ... 52 common frames omitted 2020-10-27 09:13:26.389  WARN 13156 --- [           main] o.a.tomcat.util.scan.StandardJarScanner  : Failed to scan [file:/C:/Users/xxxxx/.gradle/caches/modules-2/files-2.1/com.oracle.database.security/oraclepki/19.3.0.0/oracle.osdt/osdt_core.jar] from classloader hierarchy java.io.IOException: java.lang.reflect.InvocationTargetException at org.apache.tomcat.util.compat.Jre9Compat.jarFileNewInstance(Jre9Compat.java:205) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.JarFileUrlJar.<init>(JarFileUrlJar.java:65) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.JarFactory.newInstance(JarFactory.java:49) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.StandardJarScanner.process(StandardJarScanner.java:383) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.StandardJarScanner.processURLs(StandardJarScanner.java:318) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.StandardJarScanner.doScanClassPath(StandardJarScanner.java:282) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.StandardJarScanner.scan(StandardJarScanner.java:233) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.jasper.servlet.TldScanner.scanJars(TldScanner.java:262) ~[tomcat-embed-jasper-9.0.38.jar:9.0.38] at org.apache.jasper.servlet.TldScanner.scan(TldScanner.java:104) ~[tomcat-embed-jasper-9.0.38.jar:9.0.38] at org.apache.jasper.servlet.JasperInitializer.onStartup(JasperInitializer.java:83) ~[tomcat-embed-jasper-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5128) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na] at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) ~[na:na] at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:843) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na] at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) ~[na:na] at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.startup.Tomcat.start(Tomcat.java:486) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:123) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:104) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:437) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:191) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:178) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:158) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:545) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at com.study.springboot.Ex13JdbcTemplate1Application.main(Ex13JdbcTemplate1Application.java:10) ~[main/:na] Caused by: java.lang.reflect.InvocationTargetException: null at java.base/jdk.internal.reflect.GeneratedConstructorAccessor16.newInstance(Unknown Source) ~[na:na] at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na] at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500) ~[na:na] at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481) ~[na:na] at org.apache.tomcat.util.compat.Jre9Compat.jarFileNewInstance(Jre9Compat.java:202) ~[tomcat-embed-core-9.0.38.jar:9.0.38] ... 47 common frames omitted Caused by: java.nio.file.NoSuchFileException: C:\Users\26114\.gradle\caches\modules-2\files-2.1\com.oracle.database.security\oraclepki\19.3.0.0\oracle.osdt\osdt_core.jar at java.base/sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:85) ~[na:na] at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:103) ~[na:na] at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:108) ~[na:na] at java.base/sun.nio.fs.WindowsFileAttributeViews$Basic.readAttributes(WindowsFileAttributeViews.java:53) ~[na:na] at java.base/sun.nio.fs.WindowsFileAttributeViews$Basic.readAttributes(WindowsFileAttributeViews.java:38) ~[na:na] at java.base/sun.nio.fs.WindowsFileSystemProvider.readAttributes(WindowsFileSystemProvider.java:198) ~[na:na] at java.base/java.nio.file.Files.readAttributes(Files.java:1843) ~[na:na] at java.base/java.util.zip.ZipFile$Source.get(ZipFile.java:1160) ~[na:na] at java.base/java.util.zip.ZipFile$CleanableResource.<init>(ZipFile.java:717) ~[na:na] at java.base/java.util.zip.ZipFile.<init>(ZipFile.java:237) ~[na:na] at java.base/java.util.zip.ZipFile.<init>(ZipFile.java:167) ~[na:na] at java.base/java.util.jar.JarFile.<init>(JarFile.java:347) ~[na:na] ... 52 common frames omitted 2020-10-27 09:13:26.391  WARN 13156 --- [           main] o.a.tomcat.util.scan.StandardJarScanner  : Failed to scan [file:/C:/Users/xxxxx/.gradle/caches/modules-2/files-2.1/com.oracle.database.security/oraclepki/19.3.0.0/oracle.osdt/osdt_cert.jar] from classloader hierarchy java.io.IOException: java.lang.reflect.InvocationTargetException at org.apache.tomcat.util.compat.Jre9Compat.jarFileNewInstance(Jre9Compat.java:205) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.JarFileUrlJar.<init>(JarFileUrlJar.java:65) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.JarFactory.newInstance(JarFactory.java:49) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.StandardJarScanner.process(StandardJarScanner.java:383) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.StandardJarScanner.processURLs(StandardJarScanner.java:318) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.StandardJarScanner.doScanClassPath(StandardJarScanner.java:282) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.tomcat.util.scan.StandardJarScanner.scan(StandardJarScanner.java:233) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.jasper.servlet.TldScanner.scanJars(TldScanner.java:262) ~[tomcat-embed-jasper-9.0.38.jar:9.0.38] at org.apache.jasper.servlet.TldScanner.scan(TldScanner.java:104) ~[tomcat-embed-jasper-9.0.38.jar:9.0.38] at org.apache.jasper.servlet.JasperInitializer.onStartup(JasperInitializer.java:83) ~[tomcat-embed-jasper-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5128) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na] at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) ~[na:na] at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:843) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na] at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) ~[na:na] at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.apache.catalina.startup.Tomcat.start(Tomcat.java:486) ~[tomcat-embed-core-9.0.38.jar:9.0.38] at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:123) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:104) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:437) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:191) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:178) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:158) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:545) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE] at com.study.springboot.Ex13JdbcTemplate1Application.main(Ex13JdbcTemplate1Application.java:10) ~[main/:na] Caused by: java.lang.reflect.InvocationTargetException: null at java.base/jdk.internal.reflect.GeneratedConstructorAccessor16.newInstance(Unknown Source) ~[na:na] at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na] at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500) ~[na:na] at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481) ~[na:na] at org.apache.tomcat.util.compat.Jre9Compat.jarFileNewInstance(Jre9Compat.java:202) ~[tomcat-embed-core-9.0.38.jar:9.0.38] ... 47 common frames omitted Caused by: java.nio.file.NoSuchFileException: C:\Users\26114\.gradle\caches\modules-2\files-2.1\com.oracle.database.security\oraclepki\19.3.0.0\oracle.osdt\osdt_cert.jar at java.base/sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:85) ~[na:na] at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:103) ~[na:na] at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:108) ~[na:na] at java.base/sun.nio.fs.WindowsFileAttributeViews$Basic.readAttributes(WindowsFileAttributeViews.java:53) ~[na:na] at java.base/sun.nio.fs.WindowsFileAttributeViews$Basic.readAttributes(WindowsFileAttributeViews.java:38) ~[na:na] at java.base/sun.nio.fs.WindowsFileSystemProvider.readAttributes(WindowsFileSystemProvider.java:198) ~[na:na] at java.base/java.nio.file.Files.readAttributes(Files.java:1843) ~[na:na] at java.base/java.util.zip.ZipFile$Source.get(ZipFile.java:1160) ~[na:na] at java.base/java.util.zip.ZipFile$CleanableResource.<init>(ZipFile.java:717) ~[na:na] at java.base/java.util.zip.ZipFile.<init>(ZipFile.java:237) ~[na:na] at java.base/java.util.zip.ZipFile.<init>(ZipFile.java:167) ~[na:na] at java.base/java.util.jar.JarFile.<init>(JarFile.java:347) ~[na:na] ... 52 common frames omitted 2020-10-27 09:13:26.395  INFO 13156 --- [           main] org.apache.jasper.servlet.TldScanner     : At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time. 2020-10-27 09:13:26.404  INFO 13156 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext 2020-10-27 09:13:26.405  INFO 13156 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1392 ms 2020-10-27 09:13:26.711  INFO 13156 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor' 2020-10-27 09:13:26.922  INFO 13156 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8081 (http) with context path '' 2020-10-27 09:13:26.932  INFO 13156 --- [           main] c.s.s.Ex13JdbcTemplate1Application       : Started Ex13JdbcTemplate1Application in 2.377 seconds (JVM running for 3.299)

(강의시간 기준으로 00:20:00과 01:01:10입니다.) Xml 프로젝트에서는 Bean을 활용할 때마다 @Lazy를 작성해야 하는걸로 알고있습니다. Xml 프로젝트일 경우 서버가 가동될 때 @Autowired 또는 @Resource가 있다면 최초의 요청없이 무조건 Bean을 주입하려고 시도하고 이때, 오류가 발생하기 때문에 @Lazy를 작성해주는걸로 알고있습니다. Xml 프로젝트의 BoardController.java에서  @Autowired private BoardService boardService; @Resource(name = "loginUserBean") @Lazy private UserBean loginUserBean; boardService에 @Lazy가 없는 이유와 loginUserBean에는 왜 @Lazy가 있는지 차이에 대한 정확한 이유를 잘 모르겠습니다.

페이지의 URL 주소는 따로 따라야하거나 추천하는 규칙이 있을까요? 

컴포넌트는 재사용성을 고려한 폼이라고 알고있는데, 각 페이지에서 한번만 필요한 폼도 일일이 컴포넌트를 만들어주나요? 

흰배경으로 되요 ㅠㅠ 그림파일이 이상한 거겠죠?

h2를 로컬에 설치해서 spring boot에 연동하여 사용하는 방법 외에 지금 수업과 같은 방식으로 h2 데이터베이스를 사용한다면,  postmapping으로 user 데이터를 삽입하고 나서, 그 데이터가 계속 유지되도록 하기 위해서는 서버를 계속 가동해놓는 수 밖에 없는지 궁금합니다!