严重: Error deploying web application directory F:\Tomcat\webapps\MB
java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/MB]]
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:905)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1263)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1978)
at java.util.concurrent.Executors$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)
是Tomcat容器在加载servlet的时候出现的问题，重点检查web.xml文件是否有问题：servlet是否都定义了，mapping映射是否定义正确
servlet-name上下是否对应
MB是你要运行的项目吗、如果项目没问题把tomcat的缓存的文件夹清一下。