Upgrade to Spring Session 4.0.1.
Comment From: mrksph
Spring Session 4.0 reference doc is returning 404.
https://docs.spring.io/spring-session/reference/4.0/index.html
Comment From: philwebb
Thanks @mrksph, I see you've raised https://github.com/spring-projects/spring-session/issues/3511. We'll have to wait for a response on that issue.