This example demonstrates the Guava caching configuration. Spring’s caching abstraction is supported by many caching libraries, including Guava.

Purpose of this example is caching of the Session object previously loaded from the database. In order to minimize database load application caches Session object for configured TTL (e.g. 10 seconds) so as soon as TTL will be exceeded Session object will be removed from the cache by the appropriate Cache Manager, Guava in our case.

You can look at the /metrics endpoint to review the cache statistics of Guava caching provider. It also shows that the number of cached objects is not constant and objects are evicted from cached actually.