初始化配置问题

易感人群：部分版本（注意不是全部）版本在安装初期会发生的问题

解决方法：

将Tomcat的Server Location配置改为第二个即可

但此时问题来了，为什么选项会是灰色不可更改的呢？

答：你需要将发布到Tomcat里的项目移除出去

工程没有添加lib文件

发病症状：

1、等tomcat里没有发布项目时正常启动，发布项目之后启动失败

2、

3、报错信息

严重: 所必需的服务组件启动失败，所以无法启动Tomcat
org.apache.catalina.LifecycleException: 子容器启动失败at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:942)at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:258)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:766)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)at org.apache.catalina.startup.Catalina.start(Catalina.java:688)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.base/java.lang.reflect.Method.invoke(Method.java:567)at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:343)at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:474)
Caused by: java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: 子容器启动失败at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122)at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191)at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:931)... 13 more
Caused by: org.apache.catalina.LifecycleException: 子容器启动失败at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:942)at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1412)at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1402)at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)at java.base/java.lang.Thread.run(Thread.java:830)
Caused by: java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/HotelSystemSecond]]at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122)at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191)at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:931)... 8 more
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/HotelSystemSecond]]at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:440)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198)... 6 more
Caused by: java.lang.NoClassDefFoundError: org/apache/commons/dbutils/ResultSetHandlerat java.base/java.lang.Class.getDeclaredFields0(Native Method)at java.base/java.lang.Class.privateGetDeclaredFields(Class.java:3062)at java.base/java.lang.Class.getDeclaredFields(Class.java:2249)at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:110)at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:269)at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:137)at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:69)at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:328)at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:779)at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:299)at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5063)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)... 6 more
Caused by: java.lang.ClassNotFoundException: org.apache.commons.dbutils.ResultSetHandlerat org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1358)at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1180)... 19 more4月 06, 2020 11:03:17 上午 org.apache.coyote.AbstractProtocol pause
信息: Pausing ProtocolHandler ["http-nio-8080"]
4月 06, 2020 11:03:17 上午 org.apache.coyote.AbstractProtocol pause
信息: Pausing ProtocolHandler ["ajp-nio-8009"]
4月 06, 2020 11:03:17 上午 org.apache.catalina.core.StandardService stopInternal
信息: 正在停止服务[Catalina]
4月 06, 2020 11:03:17 上午 org.apache.coyote.AbstractProtocol destroy
信息: 正在摧毁协议处理器 ["http-nio-8080"]
4月 06, 2020 11:03:17 上午 org.apache.coyote.AbstractProtocol destroy
信息: 正在摧毁协议处理器 ["ajp-nio-8009"]
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.apache.catalina.loader.WebappClassLoaderBase (file:/D:/software/tomcat/apache-tomcat-8.5.50/lib/catalina.jar) to field java.io.ObjectStreamClass$Caches.localDescs
WARNING: Please consider reporting this to the maintainers of org.apache.catalina.loader.WebappClassLoaderBase
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

解决方法：

1、按下图步骤进入页面

2、检查是否有lib文件
注：此时可以打开Tomcat的文件夹

按照上图路（HotelSystemSecond是我自己的项目，你的文件夹里对应自己的项目名称）径找到WEB-INF

可以发现此时并没有lib文件夹

3、如果没有的话，下一步添加（按照箭头指示点击）

（1）

（2）

（3）

（4）此时发现maven依赖已经添加完成

（5）重启Tomcat，发现已经可以完成重启，再打开刚才的文件夹，发现lib文件已经添加成功，里面放的就是jar包

端口号冲突

发病症状：

1、在非正常关闭IDE的情况下，第二次打开会发生的状况

2、

3、报错信息

Several ports (8005, 8080, 8009) required by Tomcat v8.5 Server at localhost are already in use. The server may already be running in another process, or a system process may be using the port. To start this server you will need to stop the other process or change the port number(s).

解决方法：

1、win + R 输入cmd 打开命令框

2、输入代码