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CAS停留在登陆页重复时间过长，导致重复登陆的情况：
调试源代码后发现是如下问题：
FlowHnadlerAdapter第183行报错导致了Spring直接302跳转。报错信息如下：
org.springframework.webflow.execution.repository.NoSuchFlowExecutionException: No flow execution could be found with key ‘e1s1‘ -- perhaps this executing flow has ended or expired? This could happen if your users are relying on browser history (typically via the back button) that references ended flows.
认真检查了下，发现是web.xml中的session配置成了5分钟导致，将该数值调整至合适的值就不会出现该现象。
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原文地址：http://my.oschina.net/francisxjl/blog/484862
