Version 31.1 is available upstream. Please consider updating!
It seems that version 31.1 is available upstream, while the latest version in the Gentoo tree is 30.1.1. You think this warning is false? Read more about it here.
The Guava project contains several of Google's core libraries that we rely on in our Java-based projects: collections, caching, primitives support, concurrency libraries, common annotations, string processing, I/O, and so forth.