ContainerBase.addChild:?start:? org.apache.catalina.LifecycleException:?Failed?to?start?component?[StandardEngine[Catalina].StandardHost[localhost].StandardContext[/itheima74]] at?org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167) at?org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:752) at?org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:728) at?org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734) at?org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1107) at?org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1841) at?java.util.concurrent.Executors$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:744) Caused?by:?java.lang.NoClassDefFoundError:?ServletException at?java.lang.Class.getDeclaredMethods0(Native?Method) at?java.lang.Class.privateGetDeclaredMethods(Class.java:2531) at?java.lang.Class.getDeclaredMethods(Class.java:1855) at?org.apache.catalina.util.Introspection.getDeclaredMethods(Introspection.java:133) at?org.apache.catalina.startup.WebAnnotationSet.loadMethodsAnnotation(WebAnnotationSet.java:279) at?org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:137) at?org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:66) at?org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:328) at?org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:778) 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:5105) at?org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ...?10?more Caused?by:?java.lang.ClassNotFoundException:?ServletException at?org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1285) at?org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1119) ...?23?more