java.lang.NullPointerException: This exception has no message.

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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 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 com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:156)
at com.opensymphony.xwork2.config.ConfigurationManager.conditionalReload(ConfigurationManager.java:252)
at org.apache.struts2.dispatcher.Dispatcher.getContainer(Dispatcher.java:774)
at org.apache.struts2.dispatcher.Dispatcher.cleanup(Dispatcher.java:242)
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 java.lang.Thread.run(Thread.java:619)

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