问题描述：

创建了一个helloServlet

代码如下

package Test;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 * Servlet implementation class helloServlet

 */

@WebServlet("/helloServlet")

public class helloServlet extends HttpServlet {

//    private static final long serialVersionUID = 1L;

    /**

     * @see HttpServlet#HttpServlet()

     */

    public helloServlet() {

        super();

        // TODO Auto-generated constructor stub

    }

    /**

     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

     */

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        // TODO Auto-generated method stub

        response.setCharacterEncoding("GBK");

        response.getWriter().write("你好 世界");

    }

    /**

     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

     */

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        // TODO Auto-generated method stub

        doGet(request, response);

    }

}

接着配置

web.xml

代码如下：

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

  <display-name>haha</display-name>

  <welcome-file-list>

    <welcome-file>index.html</welcome-file>

    <welcome-file>index.htm</welcome-file>

    <welcome-file>index.jsp</welcome-file>

    <welcome-file>default.html</welcome-file>

    <welcome-file>default.htm</welcome-file>

    <welcome-file>default.jsp</welcome-file>

  </welcome-file-list>

  <servlet>

  <!-- 类名 -->

      <servlet-name>helloServlet</servlet-name>

      <!-- 类所在的包路径 -->

      <servlet-class>Test.helloServlet</servlet-class>

   </servlet>

  <!-- 映射路径 -->

  <servlet-mapping>

  <servlet-name>helloServlet</servlet-name>

  <url-pattern>TomcatTest/helloServlet</url-pattern>

  </servlet-mapping>

</web-app>

启动server

报错错误如下

Server Tomcat v7.0 Server at localhost failed to start.

日志：

十二月 28, 2018 8:45:59 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Server version:        Apache Tomcat/7.0.92

十二月 28, 2018 8:45:59 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Server built:          Nov 9 2018 11:07:44 UTC

十二月 28, 2018 8:45:59 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Server number:         7.0.92.0

十二月 28, 2018 8:45:59 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: OS Name:               Windows 10

十二月 28, 2018 8:45:59 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: OS Version:            10.0

十二月 28, 2018 8:45:59 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Architecture:          amd64

十二月 28, 2018 8:45:59 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Java Home:             C:\Program Files\Java\jre1.8.0_161

十二月 28, 2018 8:45:59 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: JVM Version:           1.8.0_161-b12

十二月 28, 2018 8:45:59 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: JVM Vendor:            Oracle Corporation

十二月 28, 2018 8:45:59 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: CATALINA_BASE:         D:\Eclipse_WorkSpace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0

十二月 28, 2018 8:45:59 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: CATALINA_HOME:         D:\apache-tomcat-7.0.92

十二月 28, 2018 8:45:59 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Dcatalina.base=D:\Eclipse_WorkSpace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0

十二月 28, 2018 8:45:59 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Dcatalina.home=D:\apache-tomcat-7.0.92

十二月 28, 2018 8:45:59 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Dwtp.deploy=D:\Eclipse_WorkSpace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps

十二月 28, 2018 8:45:59 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Djava.endorsed.dirs=D:\apache-tomcat-7.0.92\endorsed

十二月 28, 2018 8:45:59 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Dfile.encoding=GBK

十二月 28, 2018 8:45:59 下午 org.apache.catalina.core.AprLifecycleListener lifecycleEvent

信息: Loaded APR based Apache Tomcat Native library 1.2.18 using APR version 1.6.5.

十二月 28, 2018 8:45:59 下午 org.apache.catalina.core.AprLifecycleListener lifecycleEvent

信息: APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].

十二月 28, 2018 8:45:59 下午 org.apache.catalina.core.AprLifecycleListener initializeSSL

信息: OpenSSL successfully initialized (OpenSSL 1.1.1  11 Sep 2018)

十二月 28, 2018 8:45:59 下午 org.apache.coyote.AbstractProtocol init

信息: Initializing ProtocolHandler ["http-apr-8080"]

十二月 28, 2018 8:45:59 下午 org.apache.coyote.AbstractProtocol init

信息: Initializing ProtocolHandler ["ajp-apr-8009"]

十二月 28, 2018 8:45:59 下午 org.apache.catalina.startup.Catalina load

信息: Initialization processed in 439 ms

十二月 28, 2018 8:45:59 下午 org.apache.catalina.core.StandardService startInternal

信息: Starting service Catalina

十二月 28, 2018 8:45:59 下午 org.apache.catalina.core.StandardEngine startInternal

信息: Starting Servlet Engine: Apache Tomcat/7.0.92

十二月 28, 2018 8:45:59 下午 org.apache.catalina.util.SessionIdGeneratorBase createSecureRandom

警告: Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [182] milliseconds.

十二月 28, 2018 8:46:00 下午 org.apache.catalina.core.ContainerBase startInternal

严重: A child container failed during start

java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/haha]]

    at java.util.concurrent.FutureTask.report(Unknown Source)

    at java.util.concurrent.FutureTask.get(Unknown Source)

    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1243)

    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:819)

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1707)

    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1697)

    at java.util.concurrent.FutureTask.run(Unknown Source)

    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

    at java.lang.Thread.run(Unknown Source)

Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/haha]]

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)

    ... 6 more

Caused by: java.lang.IllegalArgumentException: Invalid <url-pattern> TomcatTest/helloServlet in servlet mapping

    at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3471)

    at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3446)

    at org.apache.catalina.deploy.WebXml.configureContext(WebXml.java:1439)

    at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1352)

    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:881)

    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:388)

    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)

    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)

    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5566)

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

    ... 6 more

十二月 28, 2018 8:46:00 下午 org.apache.catalina.core.ContainerBase startInternal

严重: A child container failed during start

java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]

    at java.util.concurrent.FutureTask.report(Unknown Source)

    at java.util.concurrent.FutureTask.get(Unknown Source)

    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1243)

    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:300)

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:444)

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:758)

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

    at org.apache.catalina.startup.Catalina.start(Catalina.java:710)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

    at java.lang.reflect.Method.invoke(Unknown Source)

    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)

    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:428)

Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)

    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1707)

    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1697)

    at java.util.concurrent.FutureTask.run(Unknown Source)

    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

    at java.lang.Thread.run(Unknown Source)

Caused by: org.apache.catalina.LifecycleException: A child container failed during start

    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1254)

    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:819)

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

    ... 6 more

Caused by: java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/haha]]

    at java.util.concurrent.FutureTask.report(Unknown Source)

    at java.util.concurrent.FutureTask.get(Unknown Source)

    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1243)

    ... 8 more

Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/haha]]

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)

    ... 6 more

Caused by: java.lang.IllegalArgumentException: Invalid <url-pattern> TomcatTest/helloServlet in servlet mapping

    at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3471)

    at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3446)

    at org.apache.catalina.deploy.WebXml.configureContext(WebXml.java:1439)

    at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1352)

    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:881)

    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:388)

    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)

    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)

    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5566)

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

    ... 6 more

十二月 28, 2018 8:46:00 下午 org.apache.catalina.startup.Catalina start

严重: The required Server component failed to start so Tomcat is unable to start.

org.apache.catalina.LifecycleException: Failed to start component [StandardServer[8005]]

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)

    at org.apache.catalina.startup.Catalina.start(Catalina.java:710)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

    at java.lang.reflect.Method.invoke(Unknown Source)

    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)

    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:428)

Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardService[Catalina]]

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)

    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:758)

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

    ... 7 more

Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina]]

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)

    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:444)

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

    ... 9 more

Caused by: org.apache.catalina.LifecycleException: A child container failed during start

    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1254)

    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:300)

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

    ... 11 more

Caused by: java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]

    at java.util.concurrent.FutureTask.report(Unknown Source)

    at java.util.concurrent.FutureTask.get(Unknown Source)

    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1243)

    ... 13 more

Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)

    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1707)

    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1697)

    at java.util.concurrent.FutureTask.run(Unknown Source)

    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

    at java.lang.Thread.run(Unknown Source)

Caused by: org.apache.catalina.LifecycleException: A child container failed during start

    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1254)

    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:819)

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

    ... 6 more

Caused by: java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/haha]]

    at java.util.concurrent.FutureTask.report(Unknown Source)

    at java.util.concurrent.FutureTask.get(Unknown Source)

    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1243)

    ... 8 more

Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/haha]]

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)

    ... 6 more

Caused by: java.lang.IllegalArgumentException: Invalid <url-pattern> TomcatTest/helloServlet in servlet mapping

    at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3471)

    at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3446)

    at org.apache.catalina.deploy.WebXml.configureContext(WebXml.java:1439)

    at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1352)

    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:881)

    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:388)

    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)

    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)

    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5566)

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

    ... 6 more

十二月 28, 2018 8:46:00 下午 org.apache.coyote.AbstractProtocol pause

信息: Pausing ProtocolHandler ["http-apr-8080"]

十二月 28, 2018 8:46:00 下午 org.apache.coyote.AbstractProtocol pause

信息: Pausing ProtocolHandler ["ajp-apr-8009"]

十二月 28, 2018 8:46:00 下午 org.apache.catalina.core.StandardService stopInternal

信息: Stopping service Catalina

十二月 28, 2018 8:46:00 下午 org.apache.coyote.AbstractProtocol destroy

信息: Destroying ProtocolHandler ["http-apr-8080"]

十二月 28, 2018 8:46:00 下午 org.apache.coyote.AbstractProtocol destroy

信息: Destroying ProtocolHandler ["ajp-apr-8009"]

解决方案：

根据日志可以分析出可能跟web.xml有关

推测是否是eclipse自动会设置映射路径，于是删掉配置的servlet

代码如下：

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

  <display-name>haha</display-name>

  <welcome-file-list>

    <welcome-file>index.html</welcome-file>

    <welcome-file>index.htm</welcome-file>

    <welcome-file>index.jsp</welcome-file>

    <welcome-file>default.html</welcome-file>

    <welcome-file>default.htm</welcome-file>

    <welcome-file>default.jsp</welcome-file>

  </welcome-file-list>

</web-app>

启动server

成功

问题解决

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