Gradle Maven Central Publishing Plugin

Gradle plugin to ease publishing to Maven Central.

Note

This plugin uses the Maven Central Portal Publisher API and can not be used for publishing via the legacy OSSRH mechanism. If you still publish via OSSRH please migrate your namespace to the Maven Central Portal: https://central.sonatype.com/publishing/namespaces (or use a different plugin such as https://github.com/gradle-nexus/publish-plugin).

How to Use

The following is an example configuration for a Java library.

plugins {
    `java-library`
    id("io.github.sgtsilvio.gradle.maven-central-publishing") version "0.4.1"
    id("io.github.sgtsilvio.gradle.metadata") version "0.6.0"
}

group = "org.example"
version = "0.1.0"

metadata {
    readableName = "Example library"
    description = "Example library description"
    license {
        apache2()
    }
    developers {
        register("jdoe") {
            fullName = "John Doe"
            email = "john.doe@example.org"
        }
    }
    github {}
}

java {
    withJavadocJar()
    withSourcesJar()
}

publishing {
    publications {
        register<MavenPublication>("main") {
            from(components["java"])
        }
    }
}

signing {
    val signingKey: String? by project
    val signingPassword: String? by project
    useInMemoryPgpKeys(signingKey, signingPassword)
    sign(publishing.publications["main"])
}

Run the publishToMavenCentral task to publish all registered publications to Maven Central.

Run the publish<PublicationName>PublicationToMavenCentral task to publish only a specific publication to Maven Central.

Configuration

Maven Central Portal Credentials

You need to create a user token for the Maven Central portal: https://central.sonatype.com/account.

Set the project properties mavenCentralUsername and mavenCentralPassword to your user token.

• Set credentials via command line

  ./gradlew publishToMavenCentral -PmavenCentralUsername=<tokenUsername> -PmavenCentralPassword=<tokenPassword>

• Set credentials via ~/.gradle/gradle.properties

  mavenCentralUsername=<tokenUsername>
  mavenCentralPassword=<tokenPassword>

• Set credentials via environment variables

  export ORG_GRADLE_PROJECT_mavenCentralUsername=<tokenUsername>
  export ORG_GRADLE_PROJECT_mavenCentralPassword=<tokenPassword>

PGP Credentials

Because Maven Central requires signatures, you also need to configure PGP credentials. The specific configuration depends on your signing plugin configuration. For instance, the example above requires to set the project properties signingKey and signingPassword to the PGP key and passphrase.

Integration with Other Plugins

This plugin does not implement functionality already provided by core Gradle plugins like maven-publish and signing. Because this plugin integrates with core Gradle plugins, it enables you to use any other plugin that integrates with these plugins, for example gradle-metadata to easily configure pom metadata.