java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/Servlet_app02a]]

    at java.util.concurrent.FutureTask.report(FutureTask.java:122)

    at java.util.concurrent.FutureTask.get(FutureTask.java:192)

    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1243)

    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:819)

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1707)

    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1697)

    at java.util.concurrent.FutureTask.run(FutureTask.java:266)

    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

    at java.lang.Thread.run(Thread.java:745)

Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/Servlet_app02a]]

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)

    ... 6 more

Caused by: java.lang.IllegalArgumentException: Invalid <url-pattern> updateCustomer in servlet mapping

    at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3471)

    at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3446)

    at org.apache.catalina.deploy.WebXml.configureContext(WebXml.java:1439)

    at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1352)

    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:881)

    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:388)

    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:5566)

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

    ... 6 more