if you want to apply for Java job at the the company which needs core Java, yes, you can easy learn some Java, and play with some core stuff, though you can do

if you want to apply for Java job at the the company which needs core Java, yes, you can easy learn some Java, and play with some core stuff, though you can do it in Scala too. But most companies outside SV need Enterprise Java experience and that can be a problem as it needs much more time investments, ideally at work, and after Clojure you can find this stuff boring as hell, clunky and awkward. I have similar issue now - I have experience in Scala, Play framework, Akka, no JEE. I decided to get some Rails and Javascript experience outside work to have more chances on job market.