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java.lang.IllegalArgumentException: null source	at java.util.EventObject.(EventObject.java:38)	at org.springframework.context.ApplicationEvent.(ApplicationEvent.java:38)	at org.jasig.cas.event.AbstractEvent.(AbstractEvent.java:32)	at org.jasig.cas.event.TicketEvent.(TicketEvent.java:82)	at org.jasig.cas.event.TicketEvent.(TicketEvent.java:55)	at org.jasig.cas.event.advice.CentralAuthenticationServiceAfterReturningAdvice.afterReturning(CentralAuthenticationServiceAfterReturningAdvice.java:68)	at org.springframework.aop.framework.adapter.AfterReturningAdviceInterceptor.invoke(AfterReturningAdviceInterceptor.java:52)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:170)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:176)	at undefined.$Proxy21.validateServiceTicket(Unknown Source)	at org.jasig.cas.web.ServiceValidateController.handleRequestInternal(ServiceValidateController.java:142)	at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:139)	at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:44)	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:717)	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:658)	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:392)	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:347)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.jasig.cas.web.init.SafeDispatcherServlet.service(SafeDispatcherServlet.java:115)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)	at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:307)	at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:385)	at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:748)	at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:678)	at org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:871)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)	at java.lang.Thread.run(Thread.java:595)