错误信息： 严重: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/System_of_Information]]    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:649)    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1245)    at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1895)    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)    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:745)Caused by: java.lang.IllegalArgumentException: Invalid 
     
       messageInfoServlet in servlet mapping    at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3300)    at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3275)    at org.apache.catalina.deploy.WebXml.configureContext(WebXml.java:1438)    at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1357)    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:889)    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:386)    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:5380)    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)    ... 10 more六月 05, 2018 10:12:25 上午 org.apache.catalina.startup.HostConfig deployDirectory严重: Error deploying web application directory D:\WEB project\apache-tomcat-7.0.57\webapps\System_of_Informationjava.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/System_of_Information]]    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:904)    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:649)    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1245)    at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1895)    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)    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:745)
     

映射无效，可以查看web.xml查看配置文件是否出错；

还有就是查看跳转的路径是否正确：

打个比方，比如  <form  action="login?action=login">  跳转的  login  映射不存在，也会报这个错误；

还有就是Response.sendRedirect("login"),跳转的  login  映射不存在，也会报这个错误；

严重: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/System_of_Information]]at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:649)at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1245)at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1895)at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)at java.util.concurrent.FutureTask.run(FutureTask.java:262)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)at java.lang.Thread.run(Thread.java:745)Caused by: java.lang.IllegalArgumentException: Invalid <url-pattern> messageInfoServlet in servlet mappingat org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3300)at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3275)at org.apache.catalina.deploy.WebXml.configureContext(WebXml.java:1438)at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1357)at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:889)at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:386)at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5380)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)... 10 more六月 05, 2018 10:12:25 上午 org.apache.catalina.startup.HostConfig deployDirectory严重: Error deploying web application directory D:\WEB project\apache-tomcat-7.0.57\webapps\System_of_Informationjava.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/System_of_Information]]at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:904)at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:649)at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1245)at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1895)at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)at java.util.concurrent.FutureTask.run(FutureTask.java:262)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)at java.lang.Thread.run(Thread.java:745)