启动Java Web项目时提示错误：A child container failed during start

错误信息如下：

2015-8-22 11:30:28 org.apache.catalina.core.AprLifecycleListener init

信息: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jdk1.6.0_22\bin;.;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;D:\oracle\product\11.2.0\client_1\bin;D:\oracle\product\10.2.0\client_2\bin;D:\oracle\product\10.2.0\client_1\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;.;C:\Program
Files\Java\jdk1.6.0_22\bin;

2015-8-22 11:30:28 org.apache.tomcat.util.digester.SetPropertiesRule begin

警告: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:framework' did not find a matching property.

2015-8-22 11:30:28 org.apache.coyote.AbstractProtocol init

信息: Initializing ProtocolHandler ["http-bio-8080"]

2015-8-22 11:30:28 org.apache.coyote.AbstractProtocol init

信息: Initializing ProtocolHandler ["ajp-bio-809"]

2015-8-22 11:30:28 org.apache.catalina.startup.Catalina load

信息: Initialization processed in 1212 ms

2015-8-22 11:30:28 org.apache.catalina.core.StandardService startInternal

信息: Starting service Catalina

2015-8-22 11:30:28 org.apache.catalina.core.StandardEngine startInternal

信息: Starting Servlet Engine: Apache Tomcat/7.0.53

2015-8-22 11:30:40 org.apache.catalina.core.ContainerBase startInternal

严重: A child container failed during start

java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/framework]]

at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)

at java.util.concurrent.FutureTask.get(FutureTask.java:83)

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$Sync.innerRun(FutureTask.java:303)

at java.util.concurrent.FutureTask.run(FutureTask.java:138)

at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)

at java.lang.Thread.run(Thread.java:662)

Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/framework]]

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)

... 7 more

Caused by: java.lang.NoClassDefFoundError: HttpSessionEvent

at java.lang.Class.getDeclaredMethods0(Native Method)

at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)

at java.lang.Class.getDeclaredMethods(Class.java:1791)

at org.apache.catalina.util.Introspection.getDeclaredMethods(Introspection.java:127)

at org.apache.catalina.startup.WebAnnotationSet.loadMethodsAnnotation(WebAnnotationSet.java:279)

at org.apache.catalina.startup.WebAnnotationSet.loadApplicationListenerAnnotations(WebAnnotationSet.java:91)

at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:63)

at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:400)

at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:876)

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)

... 7 more

Caused by: java.lang.ClassNotFoundException: HttpSessionEvent

at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1720)

at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)

... 21 more

2015-8-22 11:30:40 org.apache.catalina.core.ContainerBase startInternal

严重: 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$Sync.innerGet(FutureTask.java:222)

at java.util.concurrent.FutureTask.get(FutureTask.java:83)

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:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

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$Sync.innerRun(FutureTask.java:303)

at java.util.concurrent.FutureTask.run(FutureTask.java:138)

at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)

at java.lang.Thread.run(Thread.java:662)

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)

... 7 more

问题所在：

Caused by: java.lang.NoClassDefFoundError: HttpSessionEvent，是由于缺少jar包。

解决方法：

把servlet-api.jar这个包加入到项目工程中，或者把tomcat的library加入到项目中即可。