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java.lang.UnsupportedOperationException: This parser does not support specification "null" version "null"	at javax.xml.parsers.SAXParserFactory.setSchema(SAXParserFactory.java:419)	at org.apache.commons.digester.Digester.getFactory(Digester.java:541)	at org.apache.commons.digester.Digester.getParser(Digester.java:791)	at org.apache.commons.digester.Digester.getXMLReader(Digester.java:1068)	at org.apache.commons.digester.Digester.parse(Digester.java:1916)	at org.apache.tiles.definition.digester.DigesterDefinitionsReader.read(DigesterDefinitionsReader.java:329)	at org.apache.tiles.definition.dao.BaseLocaleUrlDefinitionDAO.loadDefinitionsFromURL(BaseLocaleUrlDefinitionDAO.java:276)	at org.apache.tiles.definition.dao.CachingLocaleUrlDefinitionDAO.loadDefinitionsFromURLs(CachingLocaleUrlDefinitionDAO.java:251)	at org.apache.tiles.definition.dao.ResolvingLocaleUrlDefinitionDAO.loadDefinitionsFromURLs(ResolvingLocaleUrlDefinitionDAO.java:65)	at org.apache.tiles.definition.dao.ResolvingLocaleUrlDefinitionDAO.loadParentDefinitions(ResolvingLocaleUrlDefinitionDAO.java:58)	at org.apache.tiles.definition.dao.CachingLocaleUrlDefinitionDAO.loadDefinitionsFromURLs(CachingLocaleUrlDefinitionDAO.java:239)	at org.apache.tiles.definition.dao.ResolvingLocaleUrlDefinitionDAO.loadDefinitionsFromURLs(ResolvingLocaleUrlDefinitionDAO.java:65)	at org.apache.tiles.definition.dao.ResolvingLocaleUrlDefinitionDAO.loadParentDefinitions(ResolvingLocaleUrlDefinitionDAO.java:58)	at org.apache.tiles.definition.dao.CachingLocaleUrlDefinitionDAO.loadDefinitionsFromURLs(CachingLocaleUrlDefinitionDAO.java:239)	at org.apache.tiles.definition.dao.ResolvingLocaleUrlDefinitionDAO.loadDefinitionsFromURLs(ResolvingLocaleUrlDefinitionDAO.java:65)	at org.apache.tiles.definition.dao.CachingLocaleUrlDefinitionDAO.loadDefinitions(CachingLocaleUrlDefinitionDAO.java:222)	at org.apache.tiles.definition.dao.CachingLocaleUrlDefinitionDAO.checkAndloadDefinitions(CachingLocaleUrlDefinitionDAO.java:204)	at org.apache.tiles.definition.dao.CachingLocaleUrlDefinitionDAO.getDefinitions(CachingLocaleUrlDefinitionDAO.java:154)	at org.apache.tiles.definition.dao.CachingLocaleUrlDefinitionDAO.getDefinition(CachingLocaleUrlDefinitionDAO.java:123)	at org.apache.tiles.definition.dao.CachingLocaleUrlDefinitionDAO.getDefinition(CachingLocaleUrlDefinitionDAO.java:54)	at org.apache.tiles.definition.UnresolvingLocaleDefinitionsFactory.getDefinition(UnresolvingLocaleDefinitionsFactory.java:105)	at org.apache.tiles.impl.BasicTilesContainer.getDefinition(BasicTilesContainer.java:364)	at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:618)	at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:321)	at org.apache.struts2.views.tiles.TilesResult.doExecute(TilesResult.java:105)	at org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:186)	at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:373)	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:277)	at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)	at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:485)	at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:395)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)	at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:200)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)	at java.lang.Thread.run(Thread.java:722)