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java.lang.IllegalArgumentException: InputStream
cannot be null	at java.lang.RuntimeException.(RuntimeException.java:49)	at java.lang.IllegalArgumentException.(IllegalArgumentException.java:45)	at javax.xml.parsers.SAXParser.parse(SAXParser.java:73)	at org.apache.struts.digester.Digester.parse(Digester.java:755)	at org.apache.struts.action.ActionServlet.initServlet(ActionServlet.java:1433)	at org.apache.struts.action.ActionServlet.init(ActionServlet.java:473)	at javax.servlet.GenericServlet.init(GenericServlet.java:258)