Groovy isn't just a language that runs on the JVM, it is a super set of Java. Valid Java is valid Groovy, so if you want to convert an existing project from

Groovy isn't just a language that runs on the JVM, it is a super set of Java. Valid Java is valid Groovy, so if you want to convert an existing project from Java to Groovy you just have to change the build scripts, and change .java to .groovy. Intermingling Java and Groovy classes feels natural because their syntax's are so similar.