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casServerUrlPrefix cannot be null.
java.lang.IllegalArgumentException: casServerLoginUrl cannot be null. at org.jasig.cas.client.util.CommonUtils.assertNotNull(CommonUtils.java:42) at org.jasig.cas.client.authentication.AuthenticationFilter.init(AuthenticationFilter.java:67) at org.jasig.cas.client.util.AbstractCasFilter.init(AbstractCasFilter.java:58) at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:225) at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:308) at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:79)