Hello Huntley, We encountered the same problem too, Have you solved it? 
Is there any other information to share? Thank you very much!

在 2020年1月30日星期四 UTC+8下午11:46:27,Brian T. Huntley写道:
>
> Hello - 
>
> We're running CAS 5.3.14 with the self-executing cas.war on CentOS7 and 
> OpenJDK 1.8.0-232-b09  The war file was built with the maven overlay.
>
> This environment has has little change since November, but just in the 
> last few weeks, we have started to see more and more errors like this that 
> causes CAS to become non-functional and return 500 errors to clients:
>
> cas.war: 2020-01-30 08:19:20,909 ERROR [org.apache.catalina.core.
> ContainerBase.[Tomcat].[localhost].[/cas].[dispatcherServlet]] - <Servlet.
> service() for servlet [dispatcherServlet] in context with path [/cas] 
> threw exception [Handler dispatch failed; nested exception is java.lang.
> StackOverflowError] with root cause>
> cas.war: java.lang.StackOverflowError: null
> cas.war: at java.util.Collections$UnmodifiableList.get(Collections.java:
> 1311) ~[?:1.8.0_232]
> cas.war: at java.util.Collections$UnmodifiableList.get(Collections.java:
> 1311) ~[?:1.8.0_232]
> cas.war: at java.util.Collections$UnmodifiableList.get(Collections.java:
> 1311) ~[?:1.8.0_232]
> cas.war: at java.util.Collections$UnmodifiableList.get(Collections.java:
> 1311) ~[?:1.8.0_232]
> cas.war: at java.util.Collections$UnmodifiableList.get(Collections.java:
> 1311) ~[?:1.8.0_232]
> cas.war: at java.util.Collections$UnmodifiableList.get(Collections.java:
> 1311) ~[?:1.8.0_232]
> cas.war: at java.util.Collections$UnmodifiableList.get(Collections.java:
> 1311) ~[?:1.8.0_232]
>
>
>
> All Google has been able to tell me is a memory issue, but the CAS 
> dashboard indicates I have between 1-2GB of Java heap available.
>
> A restart of CAS resolves the issue for a few days.
>
> Anyone else ever run into this?
>
> Thank you!
> Brian
>

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