Mill is a fast, scalable, multi-language build tool that supports Java, Scala, Kotlin, and Python:
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Mill can build the same Java codebase 4-10x faster than Maven, or 2-4x faster than Gradle
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Mill comes builtin with all the tools needed to develop and publish your project without needing plugins
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Mill’s typed config language and immutable task graph helps keep builds clean and understandable
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Mill scales well from small projects to large multi-language monorepos with hundreds of modules
If you want to use Mill in your own projects, check out our documentation:
Here is some quick example, so that you can imagine how it looks:
package build
import mill._, javalib._
object foo extends JavaModule {
def ivyDeps = Agg(
ivy"net.sourceforge.argparse4j:argparse4j:0.9.0",
ivy"org.thymeleaf:thymeleaf:3.1.1.RELEASE"
)
object test extends JavaTests with TestModule.Junit4 {
def ivyDeps = super.ivyDeps() ++ Agg(
ivy"com.google.guava:guava:33.3.0-jre"
)
}
}> ./mill foo.compile # compile sources into classfiles
...
compiling 1 Java source to...
> ./mill foo.run --text hello
<h1>hello</h1>
> ./mill foo.test
...
Test foo.FooTest.testEscaping finished, ...
Test foo.FooTest.testSimple finished, ...
Test run foo.FooTest finished: 0 failed, 0 ignored, 2 total, ...
