New Gradle Users

NOTE: This example assumes Gradle 4 or higher.

Gradle is a build automation tool in the same space as Maven, Leiningen, and Boot. Gradle is primarily targeted at projects using the JVM, but has plugins for many other languages. (Now including Clojure!)

Installing Gradle

See Gradle’s installation documentation.

Initializing a project

$ mkdir my-project
$ cd my-project
$ gradle init

From here on out you’ll use ./gradlew instead of gradle in your commands. gradlew is the Gradle Wrapper which allows you to set a per-project Gradle version. This ensures all developers use the same Gradle version for the project, instead of whatever happens to be on their PATH.

Also see Gradle’s Creating New Gradle Builds.

Adding the plugin

To include plugins from Gradle’s Plugin Portal you’ll use a plugins {} block. This should be at the top of your build.gradle.

plugins {
  id 'dev.clojurephant.clojure' version '0.4.0'
  // any additional plugins declared here
}

Also see Gradle’s Using Plugins.

Configuring project information

group = 'my.example' // the group ID your artifacts should be published under
version = '0.1.0-SNAPSHOT' // the version your artifacts should be published under

Define dependencies

See Gradle’s Introduction to Dependency Management.

Repositories

No repositories are specified by default, so you must list any repositories you want to search for your dependencies.

IMPORTANT: clojurephant currently requires jcenter() (or mavenCentral() and Clojars) be included in your repository list.

repositories {
  // shorthand for https://repo1.maven.org/maven2
  mavenCentral()
  // shorthand for https://jcenter.bintray.com/
  jcenter()
  // for any other maven repository
  maven {
    name = 'Clojars' // name can be ommitted, but is helpful in troubleshooting
    url = 'https://repo.clojars.org/'
  }
}

Also see Gradle’s Declaring Repositories.

Dependencies

Unless you have a reason to do otherwise, use Gradle’s shorthand syntax <configuration> '<group>:<artifact>:<version>' (e.g. compile 'org.clojure:clojure:1.9.0') to specify dependencies.

Dependencies are put in different configurations (somewhat similar to Maven scopes). For Clojure’s purposes, the three main ones to be aware of are:

dependencies {
  implementation 'org.clojure:clojure:1.9.0'

  // due to how clojure.test is executed, an explicit JUnit 4 dependency is needed
  testImplementation 'junit:junit:4.12'

  // due to the way Gradle's REPL is started, if you need tools.namespace, you must be on 0.3+
  devImplementation 'org.clojure:tools.namespace:0.3.0-alpha4'
}

Also see Gradle’s Declaring Dependencies

Putting it all together

Full build.gradle example:

plugins {
  id 'dev.clojurephant.clojure' version '0.4.0'
}

group = 'my.example'
version = '0.1.0-SNAPSHOT'

repositories {
  jcenter()
}

dependencies {
  implementation 'org.clojure:clojure:1.9.0'

  testImplementation 'junit:junit:4.12'

  devImplementation 'org.clojure:tools.namespace:0.3.0-alpha4'
}