java.lang.IllegalArgumentException: null source

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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.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 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.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 java.lang.Thread.run(Thread.java:595)

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