当尝试启动tomcat时，我收到此错误。可能是什么原因造成的？
我已经阅读了一些类似的帖子，我似乎无法找到任何有用的东西。据我所知，我并没有错过.jar文件。
SEVERE: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:188)
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(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
... 6 more
Caused by: java.lang.NoSuchMethodError: javax.servlet.ServletContext.getClassLoader()Ljava/lang/ClassLoader;
at org.apache.catalina.startup.WebappServiceLoader.load(WebappServiceLoader.java:90)
at org.apache.catalina.startup.ContextConfig.processServletContainerInitializers(ContextConfig.java:1543)
at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1265)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:873)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:371)
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
Apr 10, 2014 1:53:30 PM org.apache.catalina.core.ContainerBase startInternal
SEVERE: 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(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:188)
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(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
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$StartChild.call(ContainerBase.java:1549)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
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:799)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 6 more
Apr 10, 2014 1:53:30 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: Failed to start component [StandardServer[8005]]
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(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
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 more
Caused 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 more
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.StandardEngine.startInternal(StandardEngine.java:300)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 11 more
以下是我的项目中包含的.jar文件：
annotations-api.jar
el-api.jar
robotium-solo-5.0.1.jar
catalina-ant.jar
gson-2.2.4-javadoc.jar
servlet-api.jar
catalina-ha.jar
gson-2.2.4-sources.jar
slf4j-api-1.7.5.jar
catalina-tribes.jar
gson-2.2.4.jar
slf4j-api-1.7.6.jar
catalina.jar
jackson-core-asl-1.9.11.jar
slf4j-log4j12-1.4.3.jar
commons-io-2.4-javadoc.jar
jackson-mapper-asl-1.9.11.jar
tomcat-api.jar
commons-io-2.4-sources.jar
jasper-el.jar
tomcat-coyote.jar
commons-io-2.4-test-sources.jar
jasper-runtime-5.5.12.jar
tomcat-dbcp.jar
commons-io-2.4-tests.jar
jasper.jar
tomcat-i18n-es.jar
commons-io-2.4.jar
json-path-0.9.0-javadoc.jar
tomcat-i18n-fr.jar
commons-lang3-3.3.1-javadoc.jar
json-path-0.9.0-sources.jar
tomcat-i18n-ja.jar
commons-lang3-3.3.1.jar
json-path-0.9.0.jar
tomcat-jdbc.jar
commons-logging-1.1.1.jar
json-smart-1.2.jar
tomcat-util.jar
commons-logging-api-1.0.4.jar
jsp-api.jar
tomcat7-websocket.jar
ecj-4.3.1.jar
loremipsum-1.0.jar
websocket-api.jar
更新：
卸载并重新安装tomcat后，我的问题得到了解决。奇怪的。
也许你忘记了servlet-mapping中的“/”。像这样：
<servlet-mapping>
<servlet-name>TestServlet</servlet-name>
<url-pattern>test</url-pattern>
</servlet-mapping>
servlet-api.jar - 在您的应用程序库列表中是错误的。此jar文件（或evivalent）必须由servlet容器（Tomcat）提供。
我在我的web.xml中使用了“invoker”，经过太多的调查后发现它已经不再在tomcat 6之后了。
删除此调用程序并使用servlet-mapping中的/servlet/servlet.class.fully.qualified.name映射所有servlet