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casServerUrlPrefix cannot be null.
java.lang.IllegalArgumentException: casServerUrlPrefix cannot be null. at org.jasig.cas.client.util.CommonUtils.assertNotNull(CommonUtils.java:55) at org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.<init>(AbstractUrlBasedTicketValidator.java:58) at org.jasig.cas.client.validation.AbstractCasProtocolUrlBasedTicketValidator.<init>(AbstractCasProtocolUrlBasedTicketValidator.java:24) at org.jasig.cas.client.validation.Cas20ServiceTicketValidator.<init>(Cas20ServiceTicketValidator.java:51) at org.jasig.cas.client.validation.Cas20ProxyReceivingTicketValidationFilter.getTicketValidator(Cas20ProxyReceivingTicketValidationFilter.java:86) at org.jasig.cas.client.validation.AbstractTicketValidationFilter.initInternal(AbstractTicketValidationFilter.java:70) at org.jasig.cas.client.validation.Cas20ProxyReceivingTicketValidationFilter.initInternal(Cas20ProxyReceivingTicketValidationFilter.java:55) at org.jasig.cas.client.util.AbstractCasFilter.init(AbstractCasFilter.java:62) at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:275) at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:397) at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108) at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3696) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4343) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardHost.start(StandardHost.java:719) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443) at org.apache.catalina.core.StandardService.start(StandardService.java:516) at org.apache.catalina.core.StandardServer.start(StandardServer.java:710) at org.apache.catalina.startup.Catalina.start(Catalina.java:566) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)