Tomcat啟動報A child container failed during start問題解決

排查方案，把.xml内無關的所有注釋掉，啟動程式，如果成功了，就一點點代碼還原+重新開機，直至找到緻命的那行代碼！（比如web.xml、pom.xml）

報錯詳情：

嚴重: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/MyMaven]]
	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:931)
	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:850)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1412)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1402)
	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[/MyMaven]]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167)
	... 6 more
Caused by: java.lang.IllegalArgumentException: The session tracking mode [SSL] requested for context [/MyMaven] is not supported by that context
	at org.apache.catalina.core.ApplicationContext.setSessionTrackingModes(ApplicationContext.java:1069)
	at org.apache.catalina.core.ApplicationContextFacade.setSessionTrackingModes(ApplicationContextFacade.java:626)
	at org.apache.catalina.startup.ContextConfig.configureContext(ContextConfig.java:1400)
	at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1156)
	at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:769)
	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:299)
	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:94)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5063)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	... 6 more

七月 30, 2020 4:43:50 下午 org.apache.catalina.core.ContainerBase startInternal
嚴重: 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:931)
	at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:258)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:770)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:688)
	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:353)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:493)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1412)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1402)
	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:942)
	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:850)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	... 6 more
Caused by: java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/MyMaven]]
	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:931)
	... 8 more
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/MyMaven]]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167)
	... 6 more
Caused by: java.lang.IllegalArgumentException: The session tracking mode [SSL] requested for context [/MyMaven] is not supported by that context
	at org.apache.catalina.core.ApplicationContext.setSessionTrackingModes(ApplicationContext.java:1069)
	at org.apache.catalina.core.ApplicationContextFacade.setSessionTrackingModes(ApplicationContextFacade.java:626)
	at org.apache.catalina.startup.ContextConfig.configureContext(ContextConfig.java:1400)
	at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1156)
	at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:769)
	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:299)
	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:94)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5063)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	... 6 more

           

沒有任何有用的提示，就是啟動失敗，彈框報錯。

問了度娘，記下一些步驟：

1、servlet-api包沖突

• 出現這個問題的原因是導入了servlet-api包，與tomcat7的依賴包servlet-api沖突
• 檢查pom.xml是否導入servlet-api
• 加上

  <scope>provided</scope>

  之後再次運作，成功啟動

2、找到問題了

• 提示很明顯了，

  [SSL] requested

  表示你的xml有地方配置了SSL請求方式。
• 多看報錯提示。
• 排查方案，把.xml内無關的所有注釋掉，啟動程式，如果成功了，就一點點代碼還原+重新開機，直至找到緻命的那行代碼！

排查方案，把.xml内無關的所有注釋掉，啟動程式，如果成功了，就一點點代碼還原+重新開機，直至找到緻命的那行代碼！（比如web.xml、pom.xml）