hierarchical cache java

2016
https://stackoverflow.com/questions/40296338/what-is-the-better-option-for-a-multi-level-in-process-cache

issues
https://github.com/ben-manes/caffeine/issues/125
https://github.com/ben-manes/caffeine/issues/234
    https://github.com/teris-io/caffeinated
    https://stackoverflow.com/questions/50045033/evicting-cache-with-multiple-keys-for-the-same-value