I certainly appreciate the syntactic sugar of Groovy as a clear improvement over vanilla Java. But with time as a scarce resource I've opted to learn Scala and Clojure instead. It would be great if somehow we could smush Gradle and sbt together to build a best of all possible worlds build system for Scala.
Back in 2009, James Strachan (the creator of Groovy) stated that if he'd known about Scala first he probably wouldn't have built Groovy [1]. This Dr. Dobb's article [2] also has some good points on evaluating Groovy and whether or not it will continue to thrive. The simplicity of its syntax vs scala is a great point for Groovy though.
Back in 2009, James Strachan (the creator of Groovy) stated that if he'd known about Scala first he probably wouldn't have built Groovy [1]. This Dr. Dobb's article [2] also has some good points on evaluating Groovy and whether or not it will continue to thrive. The simplicity of its syntax vs scala is a great point for Groovy though.
[1] - http://macstrac.blogspot.com/2009/04/scala-as-long-term-repl... [2] - http://www.drdobbs.com/jvm/the-groovy-conundrum/240147731