Recommended way to schedule a future event in Confluence add-on

I noticed that the Java EE @Timeout annotation isn’t in the default Conf v6.6 included libraries in my add-on eclipse project. This add-on has a singleton that keeps a cache which we want to expire (clear the cache) after a period of time. What’s the best way to schedule a future event to do this clean-up within the Atlassian framework?

Thanks,
Al