A child container failed during start(Failed to start component [StandardEngine[Tomcat].StandardHos)

报错如下：

严重: A child container failed during startjava.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[]]    at java.util.concurrent.FutureTask.report(FutureTask.java:122)    at java.util.concurrent.FutureTask.get(FutureTask.java:192)    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123)    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800)    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(FutureTask.java:266)    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)    at java.lang.Thread.run(Thread.java:745)Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[]]    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)    ... 6 moreCaused by: java.lang.IllegalArgumentException: Servlet mapping specifies an unknown servlet name taotao-portal    at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3241)    at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3220)    at org.apache.catalina.deploy.WebXml.configureContext(WebXml.java:1367)    at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1351)    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:878)    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:376)    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5322)    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)    ... 6 more四月 23, 2017 2:24:19 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[Tomcat].StandardHost[localhost]]    at java.util.concurrent.FutureTask.report(FutureTask.java:122)    at java.util.concurrent.FutureTask.get(FutureTask.java:192)    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123)    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:302)    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:732)    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)    at org.apache.catalina.startup.Tomcat.start(Tomcat.java:341)    at org.apache.tomcat.maven.plugin.tomcat7.run.AbstractRunMojo.startContainer(AbstractRunMojo.java:1238)    at org.apache.tomcat.maven.plugin.tomcat7.run.AbstractRunMojo.execute(AbstractRunMojo.java:592)    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)    at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)    at java.lang.reflect.Method.invoke(Method.java:498)    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].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$StartChild.call(ContainerBase.java:1549)    at java.util.concurrent.FutureTask.run(FutureTask.java:266)    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)    at java.lang.Thread.run(Thread.java:745)Caused by: org.apache.catalina.LifecycleException: A child container failed during start    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1131)    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800)    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)    ... 6 more[INFO] ------------------------------------------------------------------------[INFO] BUILD FAILURE[INFO] ------------------------------------------------------------------------[INFO] Total time: 9.832 s[INFO] Finished at: 2017-04-23T14:24:19+08:00[INFO] Final Memory: 23M/68M[INFO] ------------------------------------------------------------------------[ERROR] Failed to execute goal org.apache.tomcat.maven:tomcat7-maven-plugin:2.2:run (default-cli) on project taotao-portal: Could not start Tomcat: Failed to start component [StandardServer[-1]]: Failed to start component [StandardService[Tomcat]]: Failed to start component [StandardEngine[Tomcat]]: A child container failed during start -> [Help 1][ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.[ERROR] Re-run Maven using the -X switch to enable full debug logging.[ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles:[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

经过排查发现是web.xml里的SpringMVC的servlet的name和mappingname不符合，所以才会报错

改成一样的名字之后即可成功运行项目：

[INFO] Scanning for projects...[WARNING] [WARNING] Some problems were encountered while building the effective model for com.taotao:taotao-portal:war:0.0.1-SNAPSHOT[WARNING] 'build.plugins.plugin.version' for org.apache.tomcat.maven:tomcat7-maven-plugin is missing. @ line 61, column 12[WARNING] [WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.[WARNING] [WARNING] For this reason, future Maven versions might no longer support building such malformed projects.[WARNING] [INFO]                                                                         [INFO] ------------------------------------------------------------------------[INFO] Building taotao-portal 0.0.1-SNAPSHOT[INFO] ------------------------------------------------------------------------[INFO] [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ taotao-portal ---[INFO] Deleting D:\Workspace\taotao-portal\target[INFO] [INFO] >>> tomcat7-maven-plugin:2.2:run (default-cli) > process-classes @ taotao-portal >>>[INFO] [INFO] --- maven-resources-plugin:2.7:resources (default-resources) @ taotao-portal ---[INFO] Using 'UTF-8' encoding to copy filtered resources.[INFO] Copying 3 resources[INFO] [INFO] --- maven-compiler-plugin:3.2:compile (default-compile) @ taotao-portal ---[INFO] Changes detected - recompiling the module![INFO] Compiling 1 source file to D:\Workspace\taotao-portal\target\classes[INFO] [INFO] <<< tomcat7-maven-plugin:2.2:run (default-cli) < process-classes @ taotao-portal <<<[INFO] [INFO] --- tomcat7-maven-plugin:2.2:run (default-cli) @ taotao-portal ---[INFO] Running war on http://localhost:8082/[INFO] Creating Tomcat server configuration at D:\Workspace\taotao-portal\target\tomcat[INFO] create webapp with contextPath: 四月 23, 2017 2:31:32 下午 org.apache.coyote.AbstractProtocol init信息: Initializing ProtocolHandler ["http-bio-8082"]四月 23, 2017 2:31:32 下午 org.apache.catalina.core.StandardService startInternal信息: Starting service Tomcat四月 23, 2017 2:31:32 下午 org.apache.catalina.core.StandardEngine startInternal信息: Starting Servlet Engine: Apache Tomcat/7.0.47四月 23, 2017 2:31:34 下午 org.apache.catalina.core.ApplicationContext log信息: No Spring WebApplicationInitializer types detected on classpath四月 23, 2017 2:31:34 下午 org.apache.catalina.core.ApplicationContext log信息: Initializing Spring root WebApplicationContextlog4j:WARN No appenders could be found for logger (org.springframework.web.context.ContextLoader).log4j:WARN Please initialize the log4j system properly.log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.四月 23, 2017 2:31:35 下午 org.apache.catalina.core.ApplicationContext log信息: Initializing Spring FrameworkServlet 'taotao-portal'四月 23, 2017 2:31:35 下午 org.apache.coyote.AbstractProtocol start信息: Starting ProtocolHandler ["http-bio-8082"]