异常情况：

　　Tomcat启动时异常：java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException

异常内容：

java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/struts2Project]]
    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:917)
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:871)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1409)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1399)
    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[/struts2Project]]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
    ... 6 more
Caused by: java.lang.IllegalArgumentException: Invalid <url-pattern> .action in filter mapping
    at org.apache.catalina.core.StandardContext.validateFilterMap(StandardContext.java:2885)
    at org.apache.catalina.core.StandardContext.addFilterMap(StandardContext.java:2834)
    at org.apache.catalina.startup.ContextConfig.configureContext(ContextConfig.java:1271)
    at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1176)
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:771)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:305)
    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:5065)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)

   ... 6 more

解决方案：

　　Caused by: java.lang.IllegalArgumentException: Invalid <url-pattern> .action in filter mapping已经明确提醒<url-pattern>映射有问题，检查web.xml文件的
 <filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>*.action</url-pattern>
    <url-pattern>*.do</url-pattern>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException