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java.lang.NullPointerException: 	at org.jasig.cas.client.util.ReflectUtils.newInstance(ReflectUtils.java:79)	at org.jasig.cas.client.util.ReflectUtils.newInstance(ReflectUtils.java:66)	at org.jasig.cas.client.validation.AbstractTicketValidationFilter.getHostnameVerifier(AbstractTicketValidationFilter.java:90)	at org.jasig.cas.client.validation.Cas20ProxyReceivingTicketValidationFilter.getTicketValidator(Cas20ProxyReceivingTicketValidationFilter.java:154)	at org.jasig.cas.client.validation.AbstractTicketValidationFilter.initInternal(AbstractTicketValidationFilter.java:102)	at org.jasig.cas.client.validation.Cas20ProxyReceivingTicketValidationFilter.initInternal(Cas20ProxyReceivingTicketValidationFilter.java:99)	at org.jasig.cas.client.util.AbstractCasFilter.init(AbstractCasFilter.java:82)	at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:295)	at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:422)	at org.apache.catalina.core.ApplicationFilterConfig.(ApplicationFilterConfig.java:115)	at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4038)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4692)	at org.apache.catalina.manager.ManagerServlet.start(ManagerServlet.java:1276)	at org.apache.catalina.manager.HTMLManagerServlet.start(HTMLManagerServlet.java:625)	at org.apache.catalina.manager.HTMLManagerServlet.doGet(HTMLManagerServlet.java:136)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.filters.CsrfPreventionFilter.doFilter(CsrfPreventionFilter.java:186)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:563)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)	at java.lang.Thread.run(Thread.java:680)