OpenSAML v2 TroubleShooting Tip 1

If you see the following error:

2008-01-08 15:41:53,809 ERROR [org.opensaml.xml.XMLConfigurator] Configuration file does not validate against schema

org.xml.sax.SAXParseException: UndeclaredPrefix: Cannot resolve 'xt:DEFAULT' as a QName: the prefix 'xt' is not declare
at com.sun.org.apache.xerces.internal.jaxp.validation.Util.toSAXParseException(Util.java:109)
at com.sun.org.apache.xerces.internal.jaxp.validation.ErrorHandlerAdaptor.error(ErrorHandlerAdaptor.java:104)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:382)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:316)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator$XSIErrorReporter.reportError(XMLSchemaValidator.java:429)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.reportSchemaError(XMLSchemaValidator.java:3185)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.processOneAttribute(XMLSchemaValidator.java:2799)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.processAttributes(XMLSchemaValidator.java:2735)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleStartElement(XMLSchemaValidator.java:2094)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.startElement(XMLSchemaValidator.java:705)
at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorHandlerImpl.startElement(ValidatorHandlerImpl.java:335)
at com.sun.org.apache.xml.internal.serializer.ToXMLSAXHandler.closeStartTag(ToXMLSAXHandler.java:205)
at com.sun.org.apache.xml.internal.serializer.ToSAXHandler.flushPending(ToSAXHandler.java:291)
at com.sun.org.apache.xml.internal.serializer.ToXMLSAXHandler.startElement(ToXMLSAXHandler.java:646)
at com.sun.org.apache.xml.internal.serializer.ToXMLSAXHandler.startElement(ToXMLSAXHandler.java:501)
at com.sun.org.apache.xalan.internal.xsltc.trax.DOM2TO.parse(DOM2TO.java:138)
at com.sun.org.apache.xalan.internal.xsltc.trax.DOM2TO.parse(DOM2TO.java:215)

This error is due to not endorsing XALAN.

Reference: https://spaces.internet2.edu/display/OpenSAML/OSTwoUsrManJavaInstall


==================================