I asked this at reddit as well, but I think HN may have some better insights.
What does this say for Groovy (the language) that one of its co-creators is out advocating Scala?
What does this say for Groovy (the language) that one of its co-creators is out advocating Scala?
Despite that (or perhaps because of it) my experience has indicated it's in wider use than either, and it has some enterprise-y backing (SpringSource) so I expect it's not going away.
Both Scala and Clojure are attracting people who weren't originally on the JVM though, which (again anecdotally) I don't think you can say of Groovy.
Caveat: some of these jobs might be talking about how groovy they are. On the first two pages of http://www.indeed.com/q-groovy-jobs.html there were 19 groovy-lang jobs and one false positive.
I don't think there's anything necessarily wrong with Groovy. I don't personally care for it; but as far as I'm concerned the more languages the better when it comes to the JVM.