java.util.concurrent.ExecutionException : org. apache.catalina.LifecycleException: 启动失败

Question

当我尝试运行我的项目时，它显示了这种类型的错误。

java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/Temp]]
  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:939)
  at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:872)
  at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
  at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1419)
  at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1409)
  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[/Temp]]
  at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:441)
  at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198)
  ... 6 more 
Caused by: java.lang.IllegalArgumentException: The servlets named [MyServlet] and [temp.MyServlet] are both mapped to the url-pattern [/MyServlet] which is not permitted
  at org.apache.tomcat.util.descriptor.web.WebXml.addServletMappingDecoded(WebXml.java:327)
  at org.apache.tomcat.util.descriptor.web.WebXml.addServletMapping(WebXml.java:320)
  at org.apache.catalina.startup.ContextConfig.processAnnotationWebServlet(ContextConfig.java:2389)
  at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2066)
  at org.apache.catalina.startup.ContextConfig.processAnnotationsWebResource(ContextConfig.java:1952)
  at org.apache.catalina.startup.ContextConfig.processAnnotationsWebResource(ContextConfig.java:1946)
  at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1153)
  at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:775)
  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:5077)
  at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
  ... 6 more

Dec 12, 2016 12:53:47 PM org.apache.catalina.core.ContainerBase startInternal SEVERE: A child container failed during start java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: A child container failed during start  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:939)
  at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)
  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:793)
  at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
  at org.apache.catalina.startup.Catalina.start(Catalina.java:655) 
  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:355)
  at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:495) Caused by: org.apache.catalina.LifecycleException: A child container failed during start
  at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:948)
  at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:872)
  at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
  at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1419)
  at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1409)
  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)

Dec 12, 2016 12:53:47 PM org.apache.catalina.startup.Catalina start SEVERE: The required Server component failed to start so Tomcat is unable to start. org.apache.catalina.LifecycleException: A child container failed during start  
  at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:948)
  at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)
  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:793)
  at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
  at org.apache.catalina.startup.Catalina.start(Catalina.java:655) 
  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:355)
  at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:495)

1. IDE:Ecilpse-neon
2. 服务器:Tomcat v9.0
3. Java:1.8.0(在 Tomcat 中也是)

4. 添加的 jar :

   • catalina-4.1.31

   • catalina-ant-6.0.37

   • catalina-ha-6.0.13

   • 卡塔琳娜部落

   • javax.servlet-3.0

   • servlet-api-2.5-6.1h.6

MyServlet.java

//@WebServlet("/MyServlet")
public class MyServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * Default constructor. 
     */
    public MyServlet() {
        // 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
        PrintWriter out = response.getWriter();
        out.print("Hello..............");
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    /**
     * @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);
    }

web.xml:

<?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>Temp</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>
  <servlet-name>MyServlet</servlet-name>
  <servlet-class>temp.MyServlet</servlet-class>

  </servlet>
  <servlet-mapping>
  <servlet-name>MyServlet</servlet-name>
  <url-pattern>/MyServlet</url-pattern>
  </servlet-mapping>
</web-app>

我该如何解决这些错误？

Answer 1

在我的场景中，在更改了其中一个 servlet，Tomcat 为我成功启动了 :-)