What is Gradle? Gradle is a very popular build tool today in the ecosystem of Java based languages. Although it can be used for other languages as well. Gradle is based on the principal of convention over configuration which is also been popular with Maven. Unlike XML in Maven, Gradle uses Groovy for its language which makes it a very powerful tool. One can do almost anything using Gradle. It has very good plugin system with various ready-made plugins available which can be used for different situations / environments / purposes.