前言
本来开始学习servlet了，结果写完之后一直报错，不知道是什么原因，就是卡在这里。
我使用的版本：jdk1.8+tomcat8
报错如下：
C:\tomcat\bin\catalina.bat run
[2020-01-18 03:15:04,855] Artifact untitled1:war exploded: Waiting for server connection to start artifact deployment…
Using CATALINA_BASE: “C:\Users\luochaoli.IntelliJIdea2019.3\system\tomcat\Unnamed_untitled1”
Using CATALINA_HOME: “C:\tomcat”
Using CATALINA_TMPDIR: “C:\tomcat\temp”
Using JRE_HOME: “C:\Program Files\Java\jdk1.8.0_201”
Using CLASSPATH: “C:\tomcat\bin\bootstrap.jar;C:\tomcat\bin\tomcat-juli.jar”
18-Jan-2020 15:15:06.122 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Server version: Apache Tomcat/8.5.42
18-Jan-2020 15:15:06.124 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Server built: Jun 4 2019 20:29:04 UTC
18-Jan-2020 15:15:06.124 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Server number: 8.5.42.0
18-Jan-2020 15:15:06.124 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log OS Name: Windows 7
18-Jan-2020 15:15:06.124 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log OS Version: 6.1
18-Jan-2020 15:15:06.124 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Architecture: amd64
18-Jan-2020 15:15:06.125 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Java Home: C:\Program Files\Java\jdk1.8.0_201\jre
18-Jan-2020 15:15:06.125 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log JVM Version: 1.8.0_201-b09
18-Jan-2020 15:15:06.125 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log JVM Vendor: Oracle Corporation
18-Jan-2020 15:15:06.125 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_BASE: C:\Users\luochaoli.IntelliJIdea2019.3\system\tomcat\Unnamed_untitled1
18-Jan-2020 15:15:06.125 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_HOME: C:\tomcat
18-Jan-2020 15:15:06.125 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.config.file=C:\Users\luochaoli.IntelliJIdea2019.3\system\tomcat\Unnamed_untitled1\conf\logging.properties
18-Jan-2020 15:15:06.126 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
18-Jan-2020 15:15:06.126 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcom.sun.management.jmxremote=
18-Jan-2020 15:15:06.126 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcom.sun.management.jmxremote.port=1099
18-Jan-2020 15:15:06.126 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcom.sun.management.jmxremote.ssl=false
18-Jan-2020 15:15:06.126 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcom.sun.management.jmxremote.password.file=C:\Users\luochaoli.IntelliJIdea2019.3\system\tomcat\Unnamed_untitled1\jmxremote.password
18-Jan-2020 15:15:06.126 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcom.sun.management.jmxremote.access.file=C:\Users\luochaoli.IntelliJIdea2019.3\system\tomcat\Unnamed_untitled1\jmxremote.access
18-Jan-2020 15:15:06.126 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.rmi.server.hostname=127.0.0.1
18-Jan-2020 15:15:06.126 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djdk.tls.ephemeralDHKeySize=2048
18-Jan-2020 15:15:06.126 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.protocol.handler.pkgs=org.apache.catalina.webresources
18-Jan-2020 15:15:06.126 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dignore.endorsed.dirs=
18-Jan-2020 15:15:06.126 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.base=C:\Users\luochaoli.IntelliJIdea2019.3\system\tomcat\Unnamed_untitled1
18-Jan-2020 15:15:06.126 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.home=C:\tomcat
18-Jan-2020 15:15:06.127 淇℃伅 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.io.tmpdir=C:\tomcat\temp
18-Jan-2020 15:15:06.127 淇℃伅 [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [C:\Program Files\Java\jdk1.8.0_201\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0;D:\nodejs;C:\Program Files\Java\jdk1.8.0_201\bin;C:\Program Files\Java\jdk1.8.0_201\bin;C:\Program Files\Java\jdk1.8.0_201\jre\bin;C:\Program Files\Apache Software Foundation\Tomcat 9.0\bin;C:\Users\luochaoli\AppData\Roaming\npm;.]
18-Jan-2020 15:15:06.291 淇℃伅 [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler [“http-nio-8080”]
18-Jan-2020 15:15:06.306 淇℃伅 [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
18-Jan-2020 15:15:06.335 淇℃伅 [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler [“ajp-nio-8009”]
18-Jan-2020 15:15:06.340 淇℃伅 [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
18-Jan-2020 15:15:06.341 淇℃伅 [main] org.apache.catalina.startup.Catalina.load Initialization processed in 654 ms
18-Jan-2020 15:15:06.374 淇℃伅 [main] org.apache.catalina.core.StandardService.startInternal Starting service [Catalina]
18-Jan-2020 15:15:06.375 淇℃伅 [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.5.42
18-Jan-2020 15:15:06.388 淇℃伅 [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler [“http-nio-8080”]
18-Jan-2020 15:15:06.404 淇℃伅 [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler [“ajp-nio-8009”]
18-Jan-2020 15:15:06.410 淇℃伅 [main] org.apache.catalina.startup.Catalina.start Server startup in 68 ms
Connected to server
[2020-01-18 03:15:06,489] Artifact untitled1:war exploded: Artifact is being deployed, please wait…
18-Jan-2020 15:15:06.778 璀﹀憡 [RMI TCP Connection(3)-127.0.0.1] org.apache.tomcat.util.descriptor.web.WebXml.setVersion Unknown version string [4.0]. Default version will be used.
[2020-01-18 03:15:06,991] Artifact untitled1:war exploded: Artifact is deployed successfully
[2020-01-18 03:15:06,991] Artifact untitled1:war exploded: Deploy took 502 milliseconds
18-Jan-2020 15:15:16.393 淇℃伅 [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [C:\tomcat\webapps\manager]
18-Jan-2020 15:15:16.482 淇℃伅 [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [C:\tomcat\webapps\manager] has finished in [88] ms
网上搜索了许久，还是没有解决
一：说是版本不行 ，然后换了tomcat9也是同样的问题。
二：包不全，servlet.jar 、jsp.jar这些我又添加进了项目还是不行。
三：环境变量，我又按照网上配置的环境，结果也不行
解决方法
估计是配置tomcat出错了，建议重新配置tomcat。
可以参考：
https://blog.csdn.net/aoshilang2249/article/details/85268870
点击打开
重新配置一遍还是不行的话，就把这里留空：
变成这样：