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java.lang.NullPointerException: 	at org.apache.xerces.impl.dtd.models.DFAContentModel.buildDFA(Unknown Source)	at org.apache.xerces.impl.dtd.models.DFAContentModel.(Unknown Source)	at org.apache.xerces.impl.dtd.DTDGrammar.createChildModel(Unknown Source)	at org.apache.xerces.impl.dtd.DTDGrammar.getElementContentModelValidator(Unknown Source)	at org.apache.xerces.impl.dtd.DTDGrammar.getElementDecl(Unknown Source)	at org.apache.xerces.impl.dtd.XMLDTDValidator.checkContent(Unknown Source)	at org.apache.xerces.impl.dtd.XMLDTDValidator.handleEndElement(Unknown Source)	at org.apache.xerces.impl.dtd.XMLDTDValidator.endElement(Unknown Source)	at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown Source)	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)	at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)	at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)	at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)	at com.sun.org.apache.commons.digester.Digester.parse(Digester.java:1548)	at org.apache.catalina.startup.ContextConfig.defaultConfig(ContextConfig.java:679)	at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:783)	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:263)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:130)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:5021)	at com.sun.webserver.connector.nsapi.WebModule.start(WebModule.java:182)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1224)	at org.apache.catalina.core.StandardHost.start(StandardHost.java:924)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1224)	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:520)	at org.apache.catalina.startup.Embedded.start(Embedded.java:917)	at com.sun.enterprise.web.PwcWebContainer.onStartup(PwcWebContainer.java:70)	at com.sun.webserver.connector.nsapi.WebContainer.start(WebContainer.java:472)	at com.sun.webserver.init.J2EERunner.confPostInit(J2EERunner.java:304)