Publishing Java packages with Gradle

You can use Gradle to publish Java packages to a registry as part of your continuous integration (CI) workflow.

Introduction

Este guia mostra como criar um fluxo de trabalho que publica pacotes Java no GitHub Package Registry e no Maven Central Repository. Com um único fluxo de trabalho, você pode publicar pacotes em um único repositório ou em vários repositórios.

Prerequisites

We recommend that you have a basic understanding of workflow files and configuration options. For more information, see "Learn GitHub Actions."

For more information about creating a CI workflow for your Java project with Gradle, see "Building and testing Java with Gradle."

You may also find it helpful to have a basic understanding of the following:

About package configuration

The groupId and artifactId fields in the MavenPublication section of the build.gradle file create a unique identifier for your package that registries use to link your package to a registry. This is similar to the groupId and artifactId fields of the Maven pom.xml file. For more information, see the "Maven Publish Plugin" in the Gradle documentation.

The build.gradle file also contains configuration for the distribution management repositories that Gradle will publish packages to. Each repository must have a name, a deployment URL, and credentials for authentication.

Publishing packages to the Maven Central Repository

Each time you create a new release, you can trigger a workflow to publish your package. The workflow in the example below runs when the release event triggers with type created. The workflow publishes the package to the Maven Central Repository if CI tests pass. For more information on the release event, see "Events that trigger workflows."

You can define a new Maven repository in the publishing block of your build.gradle file that points to your package repository. For example, if you were deploying to the Maven Central Repository through the OSSRH hosting project, your build.gradle could specify a repository with the name "OSSRH".

groovy
plugins {
  ...
  id 'maven-publish'
}

publishing {
  ...

  repositories {
    maven {
      name = "OSSRH"
      url = "https://oss.sonatype.org/service/local/staging/deploy/maven2/"
      credentials {
        username = System.getenv("MAVEN_USERNAME")
        password = System.getenv("MAVEN_PASSWORD")
      }
    }
  }
}

With this configuration, you can create a workflow that publishes your package to the Maven Central Repository by running the gradle publish command. In the deploy step, you’ll need to set environment variables for the username and password or token that you use to authenticate to the Maven repository. For more information, see "Creating and using encrypted secrets."

YAML
# This workflow uses actions that are not certified by GitHub.
# São fornecidas por terceiros e regidas por
# termos de serviço, política de privacidade e suporte separados
# documentação.

name: Publish package to the Maven Central Repository
on:
  release:
    types: [created]
jobs:
  publish:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: Set up Java
        uses: actions/setup-java@v2
        with:
          java-version: '11'
          distribution: 'adopt'
      - name: Validate Gradle wrapper
        uses: gradle/wrapper-validation-action@e6e38bacfdf1a337459f332974bb2327a31aaf4b
      - name: Publish package
        run: gradle publish
        env:
          MAVEN_USERNAME: ${{ secrets.OSSRH_USERNAME }}
          MAVEN_PASSWORD: ${{ secrets.OSSRH_TOKEN }}

Este fluxo de trabalho executa os seguintes passos:

  1. Verifica uma cópia do repositório do projeto.

  2. Define o Java JDK.

  3. Valida as somas de verificação de qualquer arquivo JAR do Gradle Wrapper presentes no repositório.

  4. Runs the gradle publish command to publish to the OSSRH Maven repository. The MAVEN_USERNAME environment variable will be set with the contents of your OSSRH_USERNAME secret, and the MAVEN_PASSWORD environment variable will be set with the contents of your OSSRH_TOKEN secret.

    For more information about using secrets in your workflow, see "Creating and using encrypted secrets."

Publishing packages to GitHub Package Registry

Each time you create a new release, you can trigger a workflow to publish your package. The workflow in the example below runs when the release event triggers with type created. The workflow publishes the package to GitHub Package Registry if CI tests pass. For more information on the release event, see "Events that trigger workflows."

You can define a new Maven repository in the publishing block of your build.gradle that points to GitHub Package Registry. In that repository configuration, you can also take advantage of environment variables set in your CI workflow run. You can use the GITHUB_ACTOR environment variable as a username, and you can set the GITHUB_TOKEN environment variable with your GITHUB_TOKEN secret.

O segredo GITHUB_TOKEN é definido como um token de acesso para o repositório toda vez que um trabalho de um fluxo de trabalho for iniciado. You should set the permissions for this access token in the workflow file to grant read access for the contents scope and write access for the packages scope. Para obter mais informações, consulteEfetuar a autenticação com o GITHUB_TOKEN".

For example, if your organization is named "octocat" and your repository is named "hello-world", then the GitHub Package Registry configuration in build.gradle would look similar to the below example.

groovy
plugins {
  ...
  id 'maven-publish'
}

publishing {
  ...

  repositories {
    maven {
      name = "GitHubPackages"
      url = "https://maven.pkg.github.com/octocat/hello-world"
      credentials {
        username = System.getenv("GITHUB_ACTOR")
        password = System.getenv("GITHUB_TOKEN")
      }
    }
  }
}

With this configuration, you can create a workflow that publishes your package to GitHub Package Registry by running the gradle publish command.

YAML
# This workflow uses actions that are not certified by GitHub.
# São fornecidas por terceiros e regidas por
# termos de serviço, política de privacidade e suporte separados
# documentação.

name: Publish package to GitHub Packages
on:
  release:
    types: [created]
jobs:
  publish:
    runs-on: ubuntu-latest 
    permissions: 
      contents: read
      packages: write 
    steps:
      - uses: actions/checkout@v2
      - uses: actions/setup-java@v2
        with:
          java-version: '11'
          distribution: 'adopt'
      - name: Validate Gradle wrapper
        uses: gradle/wrapper-validation-action@e6e38bacfdf1a337459f332974bb2327a31aaf4b
      - name: Publish package
        run: gradle publish
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

Este fluxo de trabalho executa os seguintes passos:

  1. Verifica uma cópia do repositório do projeto.

  2. Define o Java JDK.

  3. Valida as somas de verificação de qualquer arquivo JAR do Gradle Wrapper presentes no repositório.

  4. Runs the gradle publish command to publish to GitHub Package Registry. The GITHUB_TOKEN environment variable will be set with the content of the GITHUB_TOKEN secret. The permissions key specifies the access that the GITHUB_TOKEN secret will allow.

    For more information about using secrets in your workflow, see "Creating and using encrypted secrets."

Publishing packages to the Maven Central Repository and GitHub Package Registry

You can publish your packages to both the Maven Central Repository and GitHub Package Registry by configuring each in your build.gradle file.

Ensure your build.gradle file includes a repository for both your GitHub repository and your Maven Central Repository provider.

For example, if you deploy to the Central Repository through the OSSRH hosting project, you might want to specify it in a distribution management repository with the name set to OSSRH. If you deploy to GitHub Package Registry, you might want to specify it in a distribution management repository with the name set to GitHubPackages.

If your organization is named "octocat" and your repository is named "hello-world", then the configuration in build.gradle would look similar to the below example.

groovy
plugins {
  ...
  id 'maven-publish'
}

publishing {
  ...

  repositories {
    maven {
      name = "OSSRH"
      url = "https://oss.sonatype.org/service/local/staging/deploy/maven2/"
      credentials {
        username = System.getenv("MAVEN_USERNAME")
        password = System.getenv("MAVEN_PASSWORD")
      }
    }
    maven {
      name = "GitHubPackages"
      url = "https://maven.pkg.github.com/octocat/hello-world"
      credentials {
        username = System.getenv("GITHUB_ACTOR")
        password = System.getenv("GITHUB_TOKEN")
      }
    }
  }
}

With this configuration, you can create a workflow that publishes your package to both the Maven Central Repository and GitHub Package Registry by running the gradle publish command.

YAML
# This workflow uses actions that are not certified by GitHub.
# São fornecidas por terceiros e regidas por
# termos de serviço, política de privacidade e suporte separados
# documentação.

name: Publish package to the Maven Central Repository and GitHub Packages
on:
  release:
    types: [created]
jobs:
  publish:
    runs-on: ubuntu-latest 
    permissions: 
      contents: read
      packages: write 
    steps:
      - uses: actions/checkout@v2
      - name: Set up Java
        uses: actions/setup-java@v2
        with:
          java-version: '11'
          distribution: 'adopt'
      - name: Validate Gradle wrapper
        uses: gradle/wrapper-validation-action@e6e38bacfdf1a337459f332974bb2327a31aaf4b
      - name: Publish package
        run: gradle publish
        env: 
          MAVEN_USERNAME: ${{ secrets.OSSRH_USERNAME }}
          MAVEN_PASSWORD: ${{ secrets.OSSRH_TOKEN }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

Este fluxo de trabalho executa os seguintes passos:

  1. Verifica uma cópia do repositório do projeto.

  2. Define o Java JDK.

  3. Valida as somas de verificação de qualquer arquivo JAR do Gradle Wrapper presentes no repositório.

  4. Runs the gradle publish command to publish to the OSSRH Maven repository and GitHub Package Registry. The MAVEN_USERNAME environment variable will be set with the contents of your OSSRH_USERNAME secret, and the MAVEN_PASSWORD environment variable will be set with the contents of your OSSRH_TOKEN secret. The GITHUB_TOKEN environment variable will be set with the content of the GITHUB_TOKEN secret. The permissions key specifies the access that the GITHUB_TOKEN secret will allow.

    For more information about using secrets in your workflow, see "Creating and using encrypted secrets."

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