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java.lang.IllegalArgumentException: Invalid <url-pattern> null in servlet mapping	at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3075)	at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3050)	at org.apache.catalina.startup.ContextConfig.configureContext(ContextConfig.java:1372)	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:5066)	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)	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)