A child container failed during start

启动Java Web项目时提示错误：A child container failed during start

完整错误信息如下：

严重: A child container failed during startjava.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/testcs_dn-admin-web]]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:1123)at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:799)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)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[/testcs_dn-admin-web]]at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)... 6 moreCaused by: java.lang.IllegalArgumentException: Servlet mapping specifies an unknown servlet name Actionat org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3275)at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3254)at org.apache.catalina.deploy.WebXml.configureContext(WebXml.java:1430)at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1344)at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:876)at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:374)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:5355)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)... 6 more十二月 09, 2014 2:21:25 下午 org.apache.catalina.core.ContainerBase startInternal严重: A child container failed during startjava.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:1123)at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:300)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:731)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)at org.apache.catalina.startup.Catalina.start(Catalina.java:689)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:321)at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:455)Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)at java.util.concurrent.FutureTask.run(Unknown Source)at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)at java.lang.Thread.run(Unknown Source)Caused by: org.apache.catalina.LifecycleException: A child container failed during startat org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1131)at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:799)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)... 6 more十二月 09, 2014 2:21:25 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[8006]]at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)at org.apache.catalina.startup.Catalina.start(Catalina.java:689)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:321)at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:455)Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardService[Catalina]]at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:731)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)... 7 moreCaused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina]]at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)... 9 moreCaused by: org.apache.catalina.LifecycleException: A child container failed during startat org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1131)at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:300)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)... 11 more十二月 09, 2014 2:21:25 下午 org.apache.coyote.AbstractProtocol pause信息: Pausing ProtocolHandler ["http-bio-8081"]十二月 09, 2014 2:21:25 下午 org.apache.coyote.AbstractProtocol pause信息: Pausing ProtocolHandler ["ajp-bio-8010"]十二月 09, 2014 2:21:25 下午 org.apache.catalina.core.StandardService stopInternal信息: Stopping service Catalina十二月 09, 2014 2:21:25 下午 org.apache.coyote.AbstractProtocol destroy信息: Destroying ProtocolHandler ["http-bio-8081"]十二月 09, 2014 2:21:25 下午 org.apache.coyote.AbstractProtocol destroy信息: Destroying ProtocolHandler ["ajp-bio-8010"]

解决方法：

解决这个问题的关键在于错误信息中的：

Servlet mapping specifies an unknown servlet name Action

打开项目下的“src\main\webapp\WEB-INF\web.xml”文件，查找类似下面的节点：

<servlet-mapping><servlet-name>Action</servlet-name><url-pattern>/public/Action</url-pattern></servlet-mapping>

将这个节点删除，问题就解决了。