One of my favorite hobbies is to learn new technologies. This means almost anything. I like Languages, patterns, databases, and sometimes even hardware stuff (even though I am very bad at that)
That being said, from time to time I decide to revisit and adopt or abandon that technology.
This time is about Elixir. but not just about elixir, I realised that to properly learn elixir, Erlang is required.
No, you don't have to use Erlang code, but it is more about the programming style (and a bit about the libraries too).
So why to learn that?
Not only that, every time you learn a new paradigm, you bring good knowledge to yours. So learning Erlang might bring you some good improvements even in java.
But seriously, it is 2014... leave java where it belongs: in the past!