Go for Clojure. It's a modernized common-lisp with access to the wealth of Java libraries. There are resources online, and you should be able to get up and running in a matter of minutes.
I love clojure, but to be fair it took me a lot longer than that to get up and running, specially considering that I had no idea where to put the dependencies and how to compile things.
Thanks for the meaningful response. I know CL (sbcl . clisp) and Scheme (Chicken . Scheme48), but haven't done much with the JVM and I've been uncertain what relevance Clojure has.