Does anyone here work with Groovy?

Groovy is very nice, as you can easily and quickly develop small applications (e.g. automation scripts, unit tests). In contrast to Java, Groovy offers more syntactic sugar (e.g. implicitly generated getter/setters, a more developed switch-case-Construct, support for truthy values) and in general you can keep the syntax much leaner.

But I think it only makes sense to learn Groovy as an extension to Java (what it should be now). You will usually only encounter them in the Java environment. Some projects use Groovy directly in the mix with the Java language.

What makes a transition from Java to Groovy, in my opinion, somewhat more difficult is behavioral differences even with the same code (examples: the equality operator, string liters, multimethods, standard visibility of fields).