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java.lang.ClassCastException: org.apache.xerces.jaxp.SAXParserFactoryImpl	at org.xml.sax.helpers.XMLReaderFactory.loadClass(Unknown Source)	at org.xml.sax.helpers.XMLReaderFactory.createXMLReader(Unknown Source)	at org.jasig.cas.client.util.XmlUtils.getXmlReader(XmlUtils.java:42)	at org.jasig.cas.client.util.XmlUtils.getTextForElement(XmlUtils.java:116)	at org.jasig.cas.client.validation.Cas20ServiceTicketValidator.parseResponseFromServer(Cas20ServiceTicketValidator.java:69)	at org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java:188)	at com.fatwire.wem.sso.cas.CASProvider.validate(CASProvider.java:306)	at com.fatwire.wem.sso.cas.filter.CASFilter.doFilter(CASFilter.java:425)	at com.fatwire.wem.sso.SSOFilter.doFilter(SSOFilter.java:51)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)	at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)	at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)	at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)	at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)	at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)	at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)	at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)