Common OpenSAML Errors
The following errors are commonly encountered by users.
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 declared.
This error is always because you did not not endorse Xerces and Xalan. If you think you did then you have made a mistake, perhaps because your application container isn't doing what you think it's doing (for example, Tomcat "helpfully" overrides the default location of the endorsed library directory).