HTTP Status 500 - Unable to create XMLReader
type Exception report
message Unable to create XMLReader
description The server encountered an internal error that prevented it from fulfilling this request.
exception
java.lang.RuntimeException: Unable to create XMLReader
org.jasig.cas.client.util.XmlUtils.getXmlReader(XmlUtils.java:58)
org.jasig.cas.client.util.XmlUtils.getTextForElement(XmlUtils.java:130)
org.jasig.cas.client.validation.Cas20ServiceTicketValidator.parseResponseFromServer(Cas20ServiceTicketValidator.java:82)
org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java:217)
org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:169)
org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:116)
org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:76)
root cause
org.xml.sax.SAXException: SAX2 driver class org.apache.xerces.parsers.SAXParser not found
java.lang.ClassNotFoundException: org.apache.xerces.parsers.SAXParser
org.xml.sax.helpers.XMLReaderFactory.loadClass(XMLReaderFactory.java:230)
org.xml.sax.helpers.XMLReaderFactory.createXMLReader(XMLReaderFactory.java:191)
org.jasig.cas.client.util.XmlUtils.getXmlReader(XmlUtils.java:56)
org.jasig.cas.client.util.XmlUtils.getTextForElement(XmlUtils.java:130)
org.jasig.cas.client.validation.Cas20ServiceTicketValidator.parseResponseFromServer(Cas20ServiceTicketValidator.java:82)
org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java:217)
org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:169)
org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:116)
org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:76)
root cause
java.lang.ClassNotFoundException: org.apache.xerces.parsers.SAXParser
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1333)
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1167)
org.xml.sax.helpers.NewInstance.newInstance(NewInstance.java:82)
org.xml.sax.helpers.XMLReaderFactory.loadClass(XMLReaderFactory.java:228)
org.xml.sax.helpers.XMLReaderFactory.createXMLReader(XMLReaderFactory.java:191)
org.jasig.cas.client.util.XmlUtils.getXmlReader(XmlUtils.java:56)
org.jasig.cas.client.util.XmlUtils.getTextForElement(XmlUtils.java:130)
org.jasig.cas.client.validation.Cas20ServiceTicketValidator.parseResponseFromServer(Cas20ServiceTicketValidator.java:82)
org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java:217)
org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:169)
org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:116)
org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:76)
note The full stack trace of the root cause is available in the Apache Tomcat/8.0.30 logs.