> It's intended as a replacement for _scala_ builds. Having a build definition in the native language [...] makes task customization easier for the maintainer

> It's intended as a replacement for _scala_ builds. Having a build definition in the native language [...] makes task customization easier for the maintainer Totally agree! But the title of the post says "Mill: A fast JVM build tool for Java and Scala" :) - it certainly looks like better tool for the Scala community. For projects that are primarily building Java sources, it'd be nice to have a build system that uses Java code to describe the build. I don't think this exists at the moment.