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Why is uPortal unable to read its configuration files, reporting "Document is invalid: no grammar found."?

Tags: uPortal, uPortal 2.4, uPortal 2.5, System Administration, Configuration, Logs, Performance, Tomcat, Resources, Memory/Cache, uPortal 2.6
Updated: February 12, 2009
My uPortal has suddenly started reporting errors in the logs that "Document is invalid: no grammar found.". But no configuration has changed in ages, this problem just suddenly cropped up. What's going on?
There are other problems that could be causing this error, but in one surprising incident in which this error message appeared the cause was another web application upon which the portal depended (via portlets that make web service calls) becoming overloaded and responding to those calls egregiously slowly. Reducing the overwhelming load on the other application led to this problem disappearing.

      
ERROR [http-443-Processor24] utils.SAXErrorHandler.[] Dec/16 14:45:49 - ResourceLoader.getResourceAsDocument(/properties/groups/PAGSGroupStoreConfig.xml)
org.xml.sax.SAXParseException: Document is invalid: no grammar found.
	at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
	at org.apache.xerces.util.ErrorHandlerWrapper.error(Unknown Source)
	at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
	at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
	at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
	at org.apache.xerces.impl.XMLNSDocumentScannerImpl$NSContentDispatcher.scanRootElementHook(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$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.XML11Configuration.parse(Unknown Source)
	at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
	at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
	at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)
	at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:98)
	at org.jasig.portal.utils.ResourceLoader.getResourceAsDocument(ResourceLoader.java:209)
	at org.jasig.portal.utils.ResourceLoader.getResourceAsDocument(ResourceLoader.java:233)
	at org.jasig.portal.groups.pags.XMLPersonAttributesConfiguration.getConfig(XMLPersonAttributesConfiguration.java:37)
	at org.jasig.portal.groups.pags.PersonAttributesGroupStore.<init>(PersonAttributesGroupStore.java:66)
	at org.jasig.portal.groups.pags.PersonAttributesGroupStoreFactory.getGroupStore(PersonAttributesGroupStoreFactory.java:23)
	at org.jasig.portal.groups.pags.PersonAttributesGroupStoreFactory.newGroupStore(PersonAttributesGroupStoreFactory.java:33)
	at org.jasig.portal.groups.ReferenceIndividualGroupService.initialize(ReferenceIndividualGroupService.java:513)
	at org.jasig.portal.groups.ReferenceIndividualGroupService.<init>(ReferenceIndividualGroupService.java:63)
	at org.jasig.portal.groups.ReferenceIndividualGroupServiceFactory.newGroupService(ReferenceIndividualGroupServiceFactory.java:45)
	at org.jasig.portal.groups.ReferenceCompositeGroupService.initializeComponentServices(ReferenceCompositeGroupService.java:196)
	at org.jasig.portal.groups.ReferenceCompositeGroupServiceFactory.newGroupService(ReferenceCompositeGroupServiceFactory.java:37)
	at org.jasig.portal.services.GroupService.initializeCompositeService(GroupService.java:385)
	at org.jasig.portal.services.GroupService.<init>(GroupService.java:59)
	at org.jasig.portal.services.GroupService.instance(GroupService.java:396)
	at org.jasig.portal.services.GroupService.searchForGroups(GroupService.java:454)
	at org.jasig.portal.layout.dlm.providers.GroupMembershipEvaluator.getGroupKey(GroupMembershipEvaluator.java:68)
	at org.jasig.portal.layout.dlm.providers.GroupMembershipEvaluator.<init>(GroupMembershipEvaluator.java:60)
	at org.jasig.portal.layout.dlm.providers.GroupMembershipEvaluatorFactory.getAttributeEvaluator(GroupMembershipEvaluatorFactory.java:56)
	at org.jasig.portal.layout.dlm.providers.PersonEvaluatorFactory.createAttributeEvaluator(PersonEvaluatorFactory.java:151)
	at org.jasig.portal.layout.dlm.providers.PersonEvaluatorFactory.createEvaluator(PersonEvaluatorFactory.java:97)
	at org.jasig.portal.layout.dlm.providers.PersonEvaluatorFactory.createGroupEvaluator(PersonEvaluatorFactory.java:76)
	at org.jasig.portal.layout.dlm.providers.PersonEvaluatorFactory.getGroupEvaluator(PersonEvaluatorFactory.java:43)
	at org.jasig.portal.layout.dlm.providers.PersonEvaluatorFactory.createParen(PersonEvaluatorFactory.java:113)
	at org.jasig.portal.layout.dlm.providers.PersonEvaluatorFactory.createEvaluator(PersonEvaluatorFactory.java:95)
	at org.jasig.portal.layout.dlm.providers.PersonEvaluatorFactory.createGroupEvaluator(PersonEvaluatorFactory.java:76)
	at org.jasig.portal.layout.dlm.providers.PersonEvaluatorFactory.getGroupEvaluator(PersonEvaluatorFactory.java:43)
	at org.jasig.portal.layout.dlm.providers.PersonEvaluatorFactory.getEvaluator(PersonEvaluatorFactory.java:35)
	at org.jasig.portal.layout.dlm.FragmentDefinition.addEvaluator(FragmentDefinition.java:166)
	at org.jasig.portal.layout.dlm.FragmentDefinition.loadAudienceEvaluators(FragmentDefinition.java:160)
	at org.jasig.portal.layout.dlm.FragmentDefinition.<init>(FragmentDefinition.java:78)
	at org.jasig.portal.layout.dlm.ConfigurationLoader.getFragments(ConfigurationLoader.java:140)
	at org.jasig.portal.layout.dlm.ConfigurationLoader.load(ConfigurationLoader.java:56)
	at org.jasig.portal.layout.dlm.RDBMDistributedLayoutStore.<init>(RDBMDistributedLayoutStore.java:164)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
	at java.lang.Class.newInstance0(Class.java:350)
	at java.lang.Class.newInstance(Class.java:303)
	at org.jasig.portal.layout.UserLayoutStoreFactory.getUserLayoutStoreImpl(UserLayoutStoreFactory.java:94)
	at org.jasig.portal.GuestUserPreferencesManager.<init>(GuestUserPreferencesManager.java:84)
	at org.jasig.portal.GuestUserInstance.<init>(GuestUserInstance.java:59)
	at org.jasig.portal.UserInstanceManager.getUserInstance(UserInstanceManager.java:70)
	at org.jasig.portal.PortalSessionManager.doGet(PortalSessionManager.java:258)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)
	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
	at java.lang.Thread.run(Thread.java:595)
ERROR [http-443-Processor24] utils.SAXErrorHandler.[] Dec/16 14:45:49 - ResourceLoader.getResourceAsDocument(/properties/groups/PAGSGroupStoreConfig.xml)
org.xml.sax.SAXParseException: Document root element "Group-Store", must match DOCTYPE root "null".
	at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
	at org.apache.xerces.util.ErrorHandlerWrapper.error(Unknown Source)
	at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
	at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
	at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
	at org.apache.xerces.impl.XMLNSDocumentScannerImpl$NSContentDispatcher.scanRootElementHook(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$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.XML11Configuration.parse(Unknown Source)
	at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
	at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
	at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)
	at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:98)
	at org.jasig.portal.utils.ResourceLoader.getResourceAsDocument(ResourceLoader.java:209)
	at org.jasig.portal.utils.ResourceLoader.getResourceAsDocument(ResourceLoader.java:233)
	at org.jasig.portal.groups.pags.XMLPersonAttributesConfiguration.getConfig(XMLPersonAttributesConfiguration.java:37)
	at org.jasig.portal.groups.pags.PersonAttributesGroupStore.<init>(PersonAttributesGroupStore.java:66)
	at org.jasig.portal.groups.pags.PersonAttributesGroupStoreFactory.getGroupStore(PersonAttributesGroupStoreFactory.java:23)
	at org.jasig.portal.groups.pags.PersonAttributesGroupStoreFactory.newGroupStore(PersonAttributesGroupStoreFactory.java:33)
	at org.jasig.portal.groups.ReferenceIndividualGroupService.initialize(ReferenceIndividualGroupService.java:513)
	at org.jasig.portal.groups.ReferenceIndividualGroupService.<init>(ReferenceIndividualGroupService.java:63)
	at org.jasig.portal.groups.ReferenceIndividualGroupServiceFactory.newGroupService(ReferenceIndividualGroupServiceFactory.java:45)
	at org.jasig.portal.groups.ReferenceCompositeGroupService.initializeComponentServices(ReferenceCompositeGroupService.java:196)
	at org.jasig.portal.groups.ReferenceCompositeGroupServiceFactory.newGroupService(ReferenceCompositeGroupServiceFactory.java:37)
	at org.jasig.portal.services.GroupService.initializeCompositeService(GroupService.java:385)
	at org.jasig.portal.services.GroupService.<init>(GroupService.java:59)
	at org.jasig.portal.services.GroupService.instance(GroupService.java:396)
	at org.jasig.portal.services.GroupService.searchForGroups(GroupService.java:454)
	at org.jasig.portal.layout.dlm.providers.GroupMembershipEvaluator.getGroupKey(GroupMembershipEvaluator.java:68)
	at org.jasig.portal.layout.dlm.providers.GroupMembershipEvaluator.<init>(GroupMembershipEvaluator.java:60)
	at org.jasig.portal.layout.dlm.providers.GroupMembershipEvaluatorFactory.getAttributeEvaluator(GroupMembershipEvaluatorFactory.java:56)
	at org.jasig.portal.layout.dlm.providers.PersonEvaluatorFactory.createAttributeEvaluator(PersonEvaluatorFactory.java:151)
	at org.jasig.portal.layout.dlm.providers.PersonEvaluatorFactory.createEvaluator(PersonEvaluatorFactory.java:97)
	at org.jasig.portal.layout.dlm.providers.PersonEvaluatorFactory.createGroupEvaluator(PersonEvaluatorFactory.java:76)
	at org.jasig.portal.layout.dlm.providers.PersonEvaluatorFactory.getGroupEvaluator(PersonEvaluatorFactory.java:43)
	at org.jasig.portal.layout.dlm.providers.PersonEvaluatorFactory.createParen(PersonEvaluatorFactory.java:113)
	at org.jasig.portal.layout.dlm.providers.PersonEvaluatorFactory.createEvaluator(PersonEvaluatorFactory.java:95)
	at org.jasig.portal.layout.dlm.providers.PersonEvaluatorFactory.createGroupEvaluator(PersonEvaluatorFactory.java:76)
	at org.jasig.portal.layout.dlm.providers.PersonEvaluatorFactory.getGroupEvaluator(PersonEvaluatorFactory.java:43)
	at org.jasig.portal.layout.dlm.providers.PersonEvaluatorFactory.getEvaluator(PersonEvaluatorFactory.java:35)
	at org.jasig.portal.layout.dlm.FragmentDefinition.addEvaluator(FragmentDefinition.java:166)
	at org.jasig.portal.layout.dlm.FragmentDefinition.loadAudienceEvaluators(FragmentDefinition.java:160)
	at org.jasig.portal.layout.dlm.FragmentDefinition.<init>(FragmentDefinition.java:78)
	at org.jasig.portal.layout.dlm.ConfigurationLoader.getFragments(ConfigurationLoader.java:140)
	at org.jasig.portal.layout.dlm.ConfigurationLoader.load(ConfigurationLoader.java:56)
	at org.jasig.portal.layout.dlm.RDBMDistributedLayoutStore.<init>(RDBMDistributedLayoutStore.java:164)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
	at java.lang.Class.newInstance0(Class.java:350)
	at java.lang.Class.newInstance(Class.java:303)
	at org.jasig.portal.layout.UserLayoutStoreFactory.getUserLayoutStoreImpl(UserLayoutStoreFactory.java:94)
	at org.jasig.portal.GuestUserPreferencesManager.<init>(GuestUserPreferencesManager.java:84)
	at org.jasig.portal.GuestUserInstance.<init>(GuestUserInstance.java:59)
	at org.jasig.portal.UserInstanceManager.getUserInstance(UserInstanceManager.java:70)
	at org.jasig.portal.PortalSessionManager.doGet(PortalSessionManager.java:258)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)
	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
	at java.lang.Thread.run(Thread.java:595)