Feature Request - Use Caffeine instead of Google Guava

[coderFlameyosFlow]

Caffeine has extensions for features like JCache and some more features Guava has, also you get a much less memory overhead.
https://github.com/ben-manes/caffeine

[Xernium]

We are already using Guava and switching would require a big api-breaking update. Not quite unplanned but out of scope for now

[coderFlameyosFlow]

They have a migration guide from guava to caffeine

[Xernium]

I saw that, but that still doesn't constitute any sort of incentive for us to switch. We do welcome contributions however and if this switch can be done in a decent manner we would be open to talking about it/ adding it to the next big milestone