Java plugin for gradle Add build.gradle at root of the project apply plugin: 'java' This links the gradle. Makes gradle aware of java. build.gradle is written in groovy Intellij comes with an inbuilt groovy console (interpreter for the language) Groovy console can also be used as ‘java interpreter’ to quickly evaluate java code and api (akin to jshell) groovy closures: class Myclass{ void doSomething(Closure closure){ closure.call() } } obj = new Myclass() obj.