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java.lang.IllegalArgumentException: InputStream cannot be null	at javax.xml.parsers.SAXParser.parse(Unknown Source)	at org.apache.struts.digester.Digester.parse(Digester.java:755)	at org.apache.struts.action.ActionServlet.initServlet(ActionServlet.java:1434)	at org.apache.struts.action.ActionServlet.init(ActionServlet.java:474)	at javax.servlet.GenericServlet.init(GenericServlet.java:242)	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1202)	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1102)	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3631)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:3844)	at org.jboss.as.web.deployment.WebDeploymentService.start(WebDeploymentService.java:70)	at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1824)	at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1759)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)