为什么照着打就出错了
strong 变量获取到的明显是75%，老师爬取的是 : 两小时前这个文本，这就带过了？也不解释为什么？
老师，del后面的函数是相当于一个局部变量吗？
这个是不是错了呀？老师说函数外声明的是全局变量，函数内声明的是局部变量。但是我看一个教程中说在代码块 {...} 内声明了一个变量，那么这个变量只在该代码块内可见。
{...}
我自己试了下面的代码
都不是函数内声明的但是都是局部变量，因为浏览器说i和j都是undefined。
//使用if-else判断三个数的最大值，并返回出来 //如果使用三木运算符，我可以理解，但是使用if-else我却理解不了 public static int add(int num,int num1,int num2) { if ((num > num1) && (num > num2)) { return num; }else if ((num1 > num2) && (num1 > num)) { return num1; }else { return num2; } }
为什么视频里的new方法只会执行一次？
def __new__(cls, *args, **kwargs): if cls.__obj == None: cls.__obj = object.__new__(cls) return cls.__obj
__obj一开始等于None；new方法执行完第一次「a = MySingleton("aa")」的时候，__obj还等于None吗？如果等于None，是不是执行「b = MySingleton("bb")」的时候，还能创建一个新的实例对象？
两处地方不明白？
第一处：
这里这个休眠的作用是什么？本来就是一件商品，让快速赋值不就完了，加了休眠，在消费取走的时候更容易造成数据错乱？对吗？
第二处：
这个看不懂，类做了属性，和创建一个类的对象有区别吗？不知道这样写的有啥作用？这是不是建立了类鱼类之间的关键，好像是关联？
为什么turtle.penup()，turtle.pendown()带上了括号才能够在指定坐标点停留，如果没带括号还是连笔
老师请问我在输入错误的数字后再次输入正确的数字时为什么等级打印不了？
score=int(input('请输入您的分数：')) grade = '' if score>100 or score<0: score = int(input('输入错误！请再次输入您的分数：')) else: if score<60: grade='不及格' elif score<80: grade='及格' elif score<90: grade='良好' else: grade='优秀' print('您的分数为：{0},等级为:{1}'.format(score,grade))
运行图：
a = (): start = time.time() x (): a a += end = time.time() (.format((end-start))) (a)
全局变量这里，为什么要加global a呢
a=1000,不是说明a是全局变量了吗。不加global a的话，它会显示a已被调用。
如果不转换d 能和100做比较吗
eureka启动不起来，错误提示显示tomcat启动不起来
"C:\Program Files\Java\jdk-13.0.2\bin\java.exe" -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2019.3.2\lib\idea_rt.jar=56929:C:\Program Files\JetBrains\IntelliJ IDEA 2019.3.2\bin" -Dfile.encoding=UTF-8 -classpath D:\bz_parent\common_eureka\target\classes;C:\Users\cxs\.m2\repository\org\springframework\boot\spring-boot-starter-web\2.1.6.RELEASE\spring-boot-starter-web-2.1.6.RELEASE.jar;C:\Users\cxs\.m2\repository\org\springframework\boot\spring-boot-starter\2.1.6.RELEASE\spring-boot-starter-2.1.6.RELEASE.jar;C:\Users\cxs\.m2\repository\org\springframework\boot\spring-boot\2.1.6.RELEASE\spring-boot-2.1.6.RELEASE.jar;C:\Users\cxs\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.1.6.RELEASE\spring-boot-autoconfigure-2.1.6.RELEASE.jar;C:\Users\cxs\.m2\repository\org\springframework\boot\spring-boot-starter-logging\2.1.6.RELEASE\spring-boot-starter-logging-2.1.6.RELEASE.jar;C:\Users\cxs\.m2\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;C:\Users\cxs\.m2\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;C:\Users\cxs\.m2\repository\org\apache\logging\log4j\log4j-to-slf4j\2.11.2\log4j-to-slf4j-2.11.2.jar;C:\Users\cxs\.m2\repository\org\apache\logging\log4j\log4j-api\2.11.2\log4j-api-2.11.2.jar;C:\Users\cxs\.m2\repository\org\slf4j\jul-to-slf4j\1.7.26\jul-to-slf4j-1.7.26.jar;C:\Users\cxs\.m2\repository\javax\annotation\javax.annotation-api\1.3.2\javax.annotation-api-1.3.2.jar;C:\Users\cxs\.m2\repository\org\springframework\spring-core\5.1.8.RELEASE\spring-core-5.1.8.RELEASE.jar;C:\Users\cxs\.m2\repository\org\springframework\spring-jcl\5.1.8.RELEASE\spring-jcl-5.1.8.RELEASE.jar;C:\Users\cxs\.m2\repository\org\yaml\snakeyaml\1.23\snakeyaml-1.23.jar;C:\Users\cxs\.m2\repository\org\springframework\boot\spring-boot-starter-json\2.1.6.RELEASE\spring-boot-starter-json-2.1.6.RELEASE.jar;C:\Users\cxs\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.9.9\jackson-databind-2.9.9.jar;C:\Users\cxs\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.9.0\jackson-annotations-2.9.0.jar;C:\Users\cxs\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.9.9\jackson-core-2.9.9.jar;C:\Users\cxs\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.9.9\jackson-datatype-jdk8-2.9.9.jar;C:\Users\cxs\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.9.9\jackson-datatype-jsr310-2.9.9.jar;C:\Users\cxs\.m2\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.9.9\jackson-module-parameter-names-2.9.9.jar;C:\Users\cxs\.m2\repository\org\springframework\boot\spring-boot-starter-tomcat\2.1.6.RELEASE\spring-boot-starter-tomcat-2.1.6.RELEASE.jar;C:\Users\cxs\.m2\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.21\tomcat-embed-core-9.0.21.jar;C:\Users\cxs\.m2\repository\org\apache\tomcat\embed\tomcat-embed-el\9.0.21\tomcat-embed-el-9.0.21.jar;C:\Users\cxs\.m2\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.21\tomcat-embed-websocket-9.0.21.jar;C:\Users\cxs\.m2\repository\org\hibernate\validator\hibernate-validator\6.0.17.Final\hibernate-validator-6.0.17.Final.jar;C:\Users\cxs\.m2\repository\javax\validation\validation-api\2.0.1.Final\validation-api-2.0.1.Final.jar;C:\Users\cxs\.m2\repository\org\jboss\logging\jboss-logging\3.3.2.Final\jboss-logging-3.3.2.Final.jar;C:\Users\cxs\.m2\repository\com\fasterxml\classmate\1.4.0\classmate-1.4.0.jar;C:\Users\cxs\.m2\repository\org\springframework\spring-web\5.1.8.RELEASE\spring-web-5.1.8.RELEASE.jar;C:\Users\cxs\.m2\repository\org\springframework\spring-beans\5.1.8.RELEASE\spring-beans-5.1.8.RELEASE.jar;C:\Users\cxs\.m2\repository\org\springframework\spring-webmvc\5.1.8.RELEASE\spring-webmvc-5.1.8.RELEASE.jar;C:\Users\cxs\.m2\repository\org\springframework\spring-aop\5.1.8.RELEASE\spring-aop-5.1.8.RELEASE.jar;C:\Users\cxs\.m2\repository\org\springframework\spring-context\5.1.8.RELEASE\spring-context-5.1.8.RELEASE.jar;C:\Users\cxs\.m2\repository\org\springframework\spring-expression\5.1.8.RELEASE\spring-expression-5.1.8.RELEASE.jar;C:\Users\cxs\.m2\repository\org\springframework\cloud\spring-cloud-starter-netflix-eureka-server\2.1.2.RELEASE\spring-cloud-starter-netflix-eureka-server-2.1.2.RELEASE.jar;C:\Users\cxs\.m2\repository\org\springframework\cloud\spring-cloud-starter\2.1.2.RELEASE\spring-cloud-starter-2.1.2.RELEASE.jar;C:\Users\cxs\.m2\repository\org\springframework\cloud\spring-cloud-context\2.1.2.RELEASE\spring-cloud-context-2.1.2.RELEASE.jar;C:\Users\cxs\.m2\repository\org\springframework\security\spring-security-crypto\5.1.5.RELEASE\spring-security-crypto-5.1.5.RELEASE.jar;C:\Users\cxs\.m2\repository\org\springframework\cloud\spring-cloud-commons\2.1.2.RELEASE\spring-cloud-commons-2.1.2.RELEASE.jar;C:\Users\cxs\.m2\repository\org\springframework\security\spring-security-rsa\1.0.7.RELEASE\spring-security-rsa-1.0.7.RELEASE.jar;C:\Users\cxs\.m2\repository\org\bouncycastle\bcpkix-jdk15on\1.60\bcpkix-jdk15on-1.60.jar;C:\Users\cxs\.m2\repository\org\bouncycastle\bcprov-jdk15on\1.60\bcprov-jdk15on-1.60.jar;C:\Users\cxs\.m2\repository\org\springframework\cloud\spring-cloud-netflix-eureka-server\2.1.2.RELEASE\spring-cloud-netflix-eureka-server-2.1.2.RELE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-cloud-starter-netflix-archaius-2.1.2.RELEASE.jar;C:\Users\cxs\.m2\repository\org\springframework\cloud\spring-cloud-netflix-ribbon\2.1.2.RELEASE\spring-cloud-netflix-ribbon-2.1.2.RELEASE.jar;C:\Users\cxs\.m2\repository\org\springframework\cloud\spring-cloud-netflix-archaius\2.1.2.RELEASE\spring-cloud-netflix-archaius-2.1.2.RELEASE.jar;C:\Users\cxs\.m2\repository\commons-configuration\commons-configuration\1.8\commons-configuration-1.8.jar;C:\Users\cxs\.m2\repository\commons-lang\commons-lang\2.6\commons-lang-2.6.jar;C:\Users\cxs\.m2\repository\org\springframework\cloud\spring-cloud-starter-netflix-ribbon\2.1.2.RELEASE\spring-cloud-starter-netflix-ribbon-2.1.2.RELEASE.jar;C:\Users\cxs\.m2\repository\com\netflix\ribbon\ribbon\2.3.0\ribbon-2.3.0.jar;C:\Users\cxs\.m2\repository\com\netflix\ribbon\ribbon-transport\2.3.0\ribbon-transport-2.3.0.jar;C:\Users\cxs\.m2\repository\io\reactivex\rxnetty-contexts\0.4.9\rxnetty-contexts-0.4.9.jar;C:\Users\cxs\.m2\repository\io\reactivex\rxnetty-servo\0.4.9\rxnetty-servo-0.4.9.jar;C:\Users\cxs\.m2\repository\com\netflix\hystrix\hystrix-core\1.5.18\hystrix-core-1.5.18.jar;C:\Users\cxs\.m2\repository\io\reactivex\rxnetty\0.4.9\rxnetty-0.4.9.jar;C:\Users\cxs\.m2\repository\com\netflix\ribbon\ribbon-core\2.3.0\ribbon-core-2.3.0.jar;C:\Users\cxs\.m2\repository\com\netflix\ribbon\ribbon-httpclient\2.3.0\ribbon-httpclient-2.3.0.jar;C:\Users\cxs\.m2\repository\commons-collections\commons-collections\3.2.2\commons-collections-3.2.2.jar;C:\Users\cxs\.m2\repository\com\netflix\netflix-commons\netflix-commons-util\0.3.0\netflix-commons-util-0.3.0.jar;C:\Users\cxs\.m2\repository\com\netflix\ribbon\ribbon-loadbalancer\2.3.0\ribbon-loadbalancer-2.3.0.jar;C:\Users\cxs\.m2\repository\com\netflix\netflix-commons\netflix-statistics\0.1.1\netflix-statistics-0.1.1.jar;C:\Users\cxs\.m2\repository\io\reactivex\rxjava\1.3.8\rxjava-1.3.8.jar;C:\Users\cxs\.m2\repository\com\netflix\ribbon\ribbon-eureka\2.3.0\ribbon-eureka-2.3.0.jar;C:\Users\cxs\.m2\repository\org\slf4j\slf4j-api\1.7.26\slf4j-api-1.7.26.jar com.bjsxt.eureka.EurekaServerApplication Java HotSpot(TM) 64-Bit Server VM warning: Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release. 2020-05-14 20:10:12.610 INFO 10072 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$5f593045] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.1.6.RELEASE) 2020-05-14 20:10:12.867 INFO 10072 --- [ main] c.bjsxt.eureka.EurekaServerApplication : No active profile set, falling back to default profiles: default 2020-05-14 20:10:13.284 WARN 10072 --- [ main] o.s.boot.actuate.endpoint.EndpointId : Endpoint ID 'service-registry' contains invalid characters, please migrate to a valid format. 2020-05-14 20:10:13.418 INFO 10072 --- [ main] o.s.cloud.context.scope.GenericScope : BeanFactory id=330e9f2d-f41a-3688-b8df-5f69511a8206 2020-05-14 20:10:13.471 INFO 10072 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$5f593045] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) 2020-05-14 20:10:13.638 INFO 10072 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8761 (http) 2020-05-14 20:10:13.655 INFO 10072 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat] 2020-05-14 20:10:13.655 INFO 10072 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.21] 2020-05-14 20:10:13.767 INFO 10072 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2020-05-14 20:10:13.767 INFO 10072 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 893 ms 2020-05-14 20:10:13.831 WARN 10072 --- [ main] c.n.c.sources.URLConfigurationSource : No URLs will be polled as dynamic configuration sources. 2020-05-14 20:10:13.831 INFO 10072 --- [ main] c.n.c.sources.URLConfigurationSource : To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath. 2020-05-14 20:10:13.840 INFO 10072 --- [ main] c.netflix.config.DynamicPropertyFactory : DynamicPropertyFactory is initialized with configuration sources: com.netflix.config.ConcurrentCompositeConfiguration@3ad8717d 2020-05-14 20:10:14.437 INFO 10072 --- [ main] c.s.j.s.i.a.WebApplicationImpl : Initiating Jersey application, version 'Jersey: 1.19.1 03/11/2016 02:08 PM' 2020-05-14 20:10:14.477 ERROR 10072 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Exception starting filter [servletContainer] java.lang.TypeNotPresentException: Type javax.xml.bind.JAXBContext not present at java.base/sun.reflect.generics.factory.CoreReflectionFactory.makeNamedType(CoreReflectionFactory.java:117) ~[na:na] at java.base/sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Reifier.java:125) ~[na:na] at java.base/sun.reflect.generics.tree.ClassTypeSignature.accept(ClassTypeSignature.java:49) ~[na:na] at java.base/sun.reflect.generics.visitor.Reifier.reifyTypeArguments(Reifier.java:68) ~[na:na] at java.base/sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Reifier.java:138) ~[na:na] at java.base/sun.reflect.generics.tree.ClassTypeSignature.accept(ClassTypeSignature.java:49) ~[na:na] at java.base/sun.reflect.generics.repository.ClassRepository.computeSuperInterfaces(ClassRepository.java:117) ~[na:na] at java.base/sun.reflect.generics.repository.ClassRepository.getSuperInterfaces(ClassRepository.java:95) ~[na:na] at java.base/java.lang.Class.getGenericInterfaces(Class.java:1143) ~[na:na] at com.sun.jersey.core.reflection.ReflectionHelper.getClass(ReflectionHelper.java:629) ~[jersey-core-1.19.1.jar:1.19.1] at com.sun.jersey.core.reflection.ReflectionHelper.getClass(ReflectionHelper.java:625) ~[jersey-core-1.19.1.jar:1.19.1] at com.sun.jersey.core.spi.factory.ContextResolverFactory.getParameterizedType(ContextResolverFactory.java:202) ~[jersey-core-1.19.1.jar:1.19.1] at com.sun.jersey.core.spi.factory.ContextResolverFactory.init(ContextResolverFactory.java:89) ~[jersey-core-1.19.1.jar:1.19.1] at com.sun.jersey.server.impl.application.WebApplicationImpl._initiate(WebApplicationImpl.java:1332) ~[jersey-server-1.19.1.jar:1.19.1] at com.sun.jersey.server.impl.application.WebApplicationImpl.access$700(WebApplicationImpl.java:180) ~[jersey-server-1.19.1.jar:1.19.1] at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:799) ~[jersey-server-1.19.1.jar:1.19.1] at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:795) ~[jersey-server-1.19.1.jar:1.19.1] at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193) ~[jersey-core-1.19.1.jar:1.19.1] at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:795) ~[jersey-server-1.19.1.jar:1.19.1] at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:790) ~[jersey-server-1.19.1.jar:1.19.1] at com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:509) ~[jersey-servlet-1.19.1.jar:1.19.1] at com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:339) ~[jersey-servlet-1.19.1.jar:1.19.1] at com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:605) ~[jersey-servlet-1.19.1.jar:1.19.1] at com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:207) ~[jersey-servlet-1.19.1.jar:1.19.1] at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:394) ~[jersey-servlet-1.19.1.jar:1.19.1] at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:744) ~[jersey-servlet-1.19.1.jar:1.19.1] at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:270) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:106) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4530) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5169) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.21.jar:9.0.21] 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-9.0.21.jar:9.0.21] 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-9.0.21.jar:9.0.21] at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.21.jar:9.0.21] 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-9.0.21.jar:9.0.21] 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-9.0.21.jar:9.0.21] at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:932) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.apache.catalina.startup.Tomcat.start(Tomcat.java:456) ~[tomcat-embed-core-9.0.21.jar:9.0.21] at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:105) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:86) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:414) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:178) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:179) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:152) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) ~[spring-context-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:742) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:389) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:311) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1213) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1202) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at com.bjsxt.eureka.EurekaServerApplication.main(EurekaServerApplication.java:16) ~[classes/:na] Caused by: java.lang.ClassNotFoundException: javax.xml.bind.JAXBContext at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602) ~[na:na] at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) ~[na:na] at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[na:na] at java.base/java.lang.Class.forName0(Native Method) ~[na:na] at java.base/java.lang.Class.forName(Class.java:416) ~[na:na] at java.base/sun.reflect.generics.factory.CoreReflectionFactory.makeNamedType(CoreReflectionFactory.java:114) ~[na:na] ... 65 common frames omitted 2020-05-14 20:10:14.478 ERROR 10072 --- [ main] o.apache.catalina.core.StandardContext : One or more Filters failed to start. Full details will be found in the appropriate container log file 2020-05-14 20:10:14.478 ERROR 10072 --- [ main] o.apache.catalina.core.StandardContext : Context [] startup failed due to previous errors 2020-05-14 20:10:14.482 WARN 10072 --- [ main] o.a.c.loader.WebappClassLoaderBase : The web application [ROOT] appears to have started a thread named [spring.cloud.inetutils] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread: java.base@13.0.2/jdk.internal.misc.Unsafe.park(Native Method) java.base@13.0.2/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194) java.base@13.0.2/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2081) java.base@13.0.2/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:433) java.base@13.0.2/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1054) java.base@13.0.2/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1114) java.base@13.0.2/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) java.base@13.0.2/java.lang.Thread.run(Thread.java:830) 2020-05-14 20:10:14.735 INFO 10072 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat] 2020-05-14 20:10:14.738 WARN 10072 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat 2020-05-14 20:10:14.751 INFO 10072 --- [ main] ConditionEvaluationReportLoggingListener : Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2020-05-14 20:10:14.757 ERROR 10072 --- [ main] o.s.boot.SpringApplication : Application run failed org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:155) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) ~[spring-context-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:742) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:389) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:311) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1213) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1202) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at com.bjsxt.eureka.EurekaServerApplication.main(EurekaServerApplication.java:16) ~[classes/:na] Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:124) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:86) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:414) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:178) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:179) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:152) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] ... 8 common frames omitted Caused by: java.lang.IllegalStateException: StandardEngine[Tomcat].StandardHost[localhost].TomcatEmbeddedContext[] failed to start at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.rethrowDeferredStartupExceptions(TomcatWebServer.java:169) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:108) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] ... 13 common frames omitted Process finished with exit code 1
jdbc.zip
为啥显示找不到驱动异常？老师帮我看看代码
老师这个getee的文档资料地址是多少啊
用脚手架创建springboot2.3.1里面没有hibernate-valitor包。2.2.0版本才有，请问2.3.1是要在pom添加什么依赖吗？
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