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java.lang.NullPointerException: 	at org.apache.catalina.loader.WebappClassLoader.findResourceInternal(WebappClassLoader.java:2001)	at org.apache.catalina.loader.WebappClassLoader.findResource(WebappClassLoader.java:961)	at org.apache.catalina.loader.WebappClassLoader.getResource(WebappClassLoader.java:1096)	at com.opensymphony.xwork2.util.ClassLoaderUtil.getResource(ClassLoaderUtil.java:83)	at com.opensymphony.xwork2.util.location.LocationUtils.getLocation(LocationUtils.java:288)	at com.opensymphony.xwork2.util.location.LocationUtils.getLocation(LocationUtils.java:202)	at com.opensymphony.xwork2.XWorkException.(XWorkException.java:93)	at com.opensymphony.xwork2.XWorkException.(XWorkException.java:76)	at com.opensymphony.xwork2.config.ConfigurationException.(ConfigurationException.java:64)	at org.apache.struts2.config.DefaultPropertiesProvider.register(DefaultPropertiesProvider.java:47)	at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:156)	at com.opensymphony.xwork2.config.ConfigurationManager.conditionalReload(ConfigurationManager.java:252)	at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:61)	at org.apache.struts2.dispatcher.Dispatcher.getContainer(Dispatcher.java:774)	at org.apache.struts2.dispatcher.Dispatcher.cleanup(Dispatcher.java:242)	at org.apache.struts2.dispatcher.FilterDispatcher.destroy(FilterDispatcher.java:261)	at org.apache.catalina.core.ApplicationFilterConfig.release(ApplicationFilterConfig.java:332)	at org.apache.catalina.core.StandardContext.filterStop(StandardContext.java:3744)	at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4513)	at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3093)	at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:404)	at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1309)	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)	at java.lang.Thread.run(Thread.java:619)