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Spring Boot Project Examples

This page contains examples of providing Mill as a build tool for Spring Boot applications, adapting the official Spring Boot documentation in increasing complexity.

Spring Boot Web with Initializr

build.mill (download, browse)
package build

import mill.*
import mill.javalib.*

object `package` extends MavenModule {

  def mvnDeps = Seq(mvn"org.springframework.boot:spring-boot-starter-web:3.5.6")

  object test extends MavenTests, TestModule.Junit5 {

    override def junitPlatformVersion: T[String] = "6.0.0"

    def mvnDeps =
      Seq(mvn"org.springframework.boot:spring-boot-starter-test:3.5.6")
  }
}

This example demonstrates how to configure mill for a simple initializr project, using https://start.spring.io/ by choosing:

  • Project: maven

  • Language: Java

  • Dependencies: Spring Web,

The structure of this project follows the MavenModule structure (i.e. the same structure as generated from the initialzr tool).

For more information visit https://spring.io/quickstart

> ./mill test
...Test com.example.demo.DemoApplicationTests#contextLoads() finished...

> ./mill runBackground

> curl http://localhost:8096/hello
...Hello, World!...

> curl http://localhost:8096/hello?name=Mill
...Hello, Mill!...

> ./mill clean runBackground

> ./mill show assembly
.../out/assembly.dest/out.jar...