casServerUrlPrefix cannot be null

严重: Exception starting filter [CAS Single Sign Out Filter]
java.lang.IllegalArgumentException: casServerUrlPrefix cannot be null.
	at org.jasig.cas.client.util.CommonUtils.assertNotNull(CommonUtils.java:86)
	at org.jasig.cas.client.session.SingleSignOutHandler.init(SingleSignOutHandler.java:140)
	at org.jasig.cas.client.session.SingleSignOutFilter.init(SingleSignOutFilter.java:55)
	at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:285)
	at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:266)
	at org.apache.catalina.core.ApplicationFilterConfig.(ApplicationFilterConfig.java:108)
	at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4590)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5233)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1419)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1409)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)

在确定web.xml文件的配置都没有错误时,可以考虑将cas-client-core所用的版本号降低。

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