API to validate cas sessions

[blueboy85]

Hi there,

I am using a Java web app with Spring Security + CAS 4.1.9. I intend to write a servlet filter to automatically invalidate the user's session if the user's session is not valid with CAS anymore (could be due to timeout or logout from another tab). The question is how would I validate a session based on a jsessionid? Is there any API that I can call? Any help would be greatly appreciated!