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本文链接：https://blog.csdn.net/qq_38289539/article/details/79413472
cas集成协作应用出现以下报错

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:165)
com.ucap.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:134)
org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:76)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
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:165)
com.ucap.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:134)
org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:76)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
root cause

java.lang.ClassNotFoundException: org.apache.xerces.parsers.SAXParser
com.tongweb.web.thor.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1724)
com.tongweb.web.thor.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1569)
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:165)
com.ucap.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:134)
org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:76)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
note The full stack trace of the root cause is available in the TongWeb/6.1.1.0 logs.

TongWeb/6.1.1.0

加入jar  xercesImpl.jar  、xml-apis.jar 包

原文链接：https://blog.csdn.net/qq_38289539/article/details/79413472