Mill

Lesson in the Scala Roadmap · Stage 16: Ecosystems

Last updated 14 September 2026

What is Mill?

Mill is a build tool designed for Java, Scala, and Kotlin projects. It focuses on speed and efficiency by automatically caching and parallelizing build tasks and tests. Mill uses a long-lived daemon to keep the JVM warm, which helps in maintaining fast build times. It also supports selective test execution to shorten CI times. Mill is designed to be simple and intuitive, making it a good choice for both small and medium-sized projects.

Study this in the interactive course See the whole Scala roadmap

Free resources to learn Mill

ArticleMill Official Documentation

Mill: common questions

Can I learn Mill in Hindi?

This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain Mill in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.

Is this Mill tutorial for beginners?

It is lesson 89 of 165 in the free Scala roadmap, in stage 16, Ecosystems. If you are new to Scala, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.