> On the JVM we have things like Grails on Groovy, Clojure and Scala Grails is related to Groovy, but not to Clojure or to Scala. I'm sure you just typed it wr

> On the JVM we have things like Grails on Groovy, Clojure and Scala Grails is related to Groovy, but not to Clojure or to Scala. I'm sure you just typed it wrong, but I'm correcting you because some readers might get confused. To be more precise, Groovy runs on Grails, not vice versa. And almost all of Grails, even Grails 3.0 just released, is written in Java, not Groovy. Groovy is merely provided for use by website builders using Grails. This is different to frameworks using Clojure and Scala, which not only provide the respective language for website builders, but are generally also written in the language rather than Java.