At present, RedisIndexedHttpSessionConfiguration and JdbcHttpSessionConfiguration include [at]EnableScheduling annotated inner configuration classes that configure expired session cleanup jobs. This approach silently opts in users into general purpose task scheduling support provided by Spring Framework, which isn't something a library should do. Ideally, session cleanup jobs should only require a single thread dedicated to their execution and also one that doesn't compete for resources with general purpose task scheduling.
This commit updates RedisIndexedSessionRepository and JdbcIndexedSessionRepository to have them manage their own ThreadPoolTaskScheduler for purposes of running expired session cleanup jobs.
Closes gh-2136
954a40f5d1