Well, I recommend to move to scala language instead :)
I really find this kind of Snark disappointing on HN, and one of the many examples of a decline in the quality of comments that PG has talked about.
Either you like Java and you don't need Guava, or you want functional programming and other goodness and for that Scala is a better language.
Scala is close to Java because it compiles to JVM and you can use Java libraries in scala (so that's not a big deal to switch to it). You can nearly code in scala like in Java with some syntax improvment and in a functional way.