java.lang.RuntimeException: Unable to create XMLReader

java.lang.RuntimeException: Unable to create XMLReader

        at org.jasig.cas.client.util.XmlUtils.getXmlReader(XmlUtils.java:58)

        at org.jasig.cas.client.util.XmlUtils.getTextForElement(XmlUtils.java:130)

        at org.jasig.cas.client.validation.Cas20ServiceTicketValidator.parseResponseFromServer(Cas20ServiceTicketValidator.java:82)

        at org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java:217)

        at org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:169)

        at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)

        at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)

        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)

        at org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:116)

        at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)

        at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)

        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)

        at org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:76)

        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)

        at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)

        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)

        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3436)

        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3402)

        at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)

        at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)

        at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:57)

        at weblogic.servlet.internal.WebAppServletContext.doSecuredExecute(WebAppServletContext.java:2285)

        at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2201)

        at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179)

        at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1572)

        at weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:255)

        at weblogic.work.ExecuteThread.execute(ExecuteThread.java:311)

        at weblogic.work.ExecuteThread.run(ExecuteThread.java:263)

Caused By: org.xml.sax.SAXException: SAX2 driver class org.apache.xerces.parsers.SAXParser not found

java.lang.ClassNotFoundException: org.apache.xerces.parsers.SAXParser

        at org.xml.sax.helpers.XMLReaderFactory.loadClass(XMLReaderFactory.java:230)

        at org.xml.sax.helpers.XMLReaderFactory.createXMLReader(XMLReaderFactory.java:191)

        at org.jasig.cas.client.util.XmlUtils.getXmlReader(XmlUtils.java:56)

        at org.jasig.cas.client.util.XmlUtils.getTextForElement(XmlUtils.java:130)

        at org.jasig.cas.client.validation.Cas20ServiceTicketValidator.parseResponseFromServer(Cas20ServiceTicketValidator.java:82)

        at org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java:217)

        at org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:169)

        at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)

        at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)

        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)

        at org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:116)

        at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)

        at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)

        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)

        at org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:76)

        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)

        at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)

        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)

        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3436)

        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3402)

        at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)

        at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)

        at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:57)

        at weblogic.servlet.internal.WebAppServletContext.doSecuredExecute(WebAppServletContext.java:2285)

        at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2201)

        at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179)

        at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1572)

        at weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:255)

        at weblogic.work.ExecuteThread.execute(ExecuteThread.java:311)

        at weblogic.work.ExecuteThread.run(ExecuteThread.java:263)

Caused By: java.lang.ClassNotFoundException: org.apache.xerces.parsers.SAXParser

        at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:357)

        at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:318)

        at weblogic.utils.classloaders.ChangeAwareClassLoader.findClass(ChangeAwareClassLoader.java:80)

        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

        at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:186)

        at weblogic.utils.classloaders.ChangeAwareClassLoader.loadClass(ChangeAwareClassLoader.java:50)

        at org.xml.sax.helpers.NewInstance.newInstance(NewInstance.java:82)

        at org.xml.sax.helpers.XMLReaderFactory.loadClass(XMLReaderFactory.java:228)

        at org.xml.sax.helpers.XMLReaderFactory.createXMLReader(XMLReaderFactory.java:191)

        at org.jasig.cas.client.util.XmlUtils.getXmlReader(XmlUtils.java:56)

        at org.jasig.cas.client.util.XmlUtils.getTextForElement(XmlUtils.java:130)

        at org.jasig.cas.client.validation.Cas20ServiceTicketValidator.parseResponseFromServer(Cas20ServiceTicketValidator.java:82)

        at org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java:217)

        at org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:169)

        at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)

        at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)

        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)

        at org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:116)

        at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)

        at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)

        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)

        at org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:76)

        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)

        at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)

        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)

        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3436)

        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3402)

        at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)

        at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)

        at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:57)

        at weblogic.servlet.internal.WebAppServletContext.doSecuredExecute(WebAppServletContext.java:2285)

        at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2201)

        at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179)

        at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1572)

        at weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:255)

        at weblogic.work.ExecuteThread.execute(ExecuteThread.java:311)
        at weblogic.work.ExecuteThread.run(ExecuteThread.java:263)

解决这个问题的方法就是下载个xerces.jar包，本人在weblogic下发布出现这个错误，原因为weblogic会默认用自带的xml解析器