Set up your GitHub Actions workflow with a specific version of Java
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setup-java

GitHub Actions status

This action sets up a java environment for use in actions by:

  • optionally downloading and caching a requested version of java by version and adding to PATH. Default downloads are populated from the Zulu Community distribution of OpenJDK
  • registering problem matchers for error output

Usage

See action.yml

Basic

steps:
- uses: actions/checkout@v2
- uses: actions/setup-java@v1
  with:
    java-version: '9.0.4' # The JDK version to make available on the path.
    java-package: jdk # (jre, jdk, or jdk+fx) - defaults to jdk
    architecture: x64 # (x64 or x86) - defaults to x64
- run: java -cp java HelloWorldApp

Examples of version specifications that the java-version parameter will accept:

  • A major Java version

    e.g. 6, 7, 8, 9, 10, 11, 12, 13, ...

  • A semver Java version specification

    e.g. 8.0.232, 7.0.181, 11.0.4

    e.g. 8.0.x, >11.0.3, >=13.0.1, <8.0.212

  • An early access (EA) Java version

    e.g. 14-ea, 15-ea

    e.g. 14.0.0-ea, 15.0.0-ea

    e.g. 14.0.0-ea.28, 15.0.0-ea.2 (syntax for specifying an EA build number)

    Note that, per semver rules, EA builds will be matched by explicit EA version specifications.

  • 1.x syntax

    e.g. 1.8 (same as 8)

    e.g. 1.8.0.212 (same as 8.0.212)

Local file

steps:
- uses: actions/checkout@v2
- uses: actions/setup-java@v1
  with:
    java-version: '4.0.0'
    architecture: x64
    jdkFile: <path to jdkFile> # Optional - jdkFile to install java from. Useful for versions not found on Zulu Community CDN
- run: java -cp java HelloWorldApp

Matrix Testing

jobs:
  build:
    runs-on: ubuntu-16.04
    strategy:
      matrix:
        # test against latest update of each major Java version, as well as specific updates of LTS versions:
        java: [ 1.6, 6.0.83, 7, 7.0.181, 8, 8.0.192, 9.0.x, 10, 11.0.x, 11.0.3, 12, 13 ]
    name: Java ${{ matrix.java }} sample
    steps:
      - uses: actions/checkout@v2
      - name: Setup java
        uses: actions/setup-java@v1
        with:
          java-version: ${{ matrix.java }}
      - run: java -cp java HelloWorldApp

Publishing using Apache Maven

Extra setup for pom.xml:

According to possible issues with Inappropriate ioctl for device or gpg: signing failed: No such file or directory, Maven GPG Plugin configuration in pom.xml should contain the following:

<configuration>
  <!-- Prevent gpg from using pinentry programs -->
  <gpgArguments>
    <arg>--pinentry-mode</arg>
    <arg>loopback</arg>
  </gpgArguments>
</configuration>

GPG 2.1 requires --pinentry-mode to be set to loopback in order to pick up gpg.passphrase value defined in Maven settings.xml

Yaml example:

jobs:
  build:

    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v2
    - name: Set up JDK 1.8
      uses: actions/setup-java@v1
      with:
        java-version: 1.8

    - name: Build with Maven
      run: mvn -B package --file pom.xml

    - name: Publish to GitHub Packages Apache Maven
      run: mvn deploy
      env:
        GITHUB_TOKEN: ${{ github.token }} # GITHUB_TOKEN is the default env for the password

    - name: Set up Apache Maven Central
      uses: actions/setup-java@v1
      with: # running setup-java again overwrites the settings.xml
        java-version: 1.8
        server-id: maven # Value of the distributionManagement/repository/id field of the pom.xml
        server-username: MAVEN_USERNAME # env variable for username in deploy
        server-password: MAVEN_CENTRAL_TOKEN # env variable for token in deploy
        gpg-private-key: ${{ secrets.MAVEN_GPG_PRIVATE_KEY }} # Value of the GPG private key to import
        gpg-passphrase: MAVEN_GPG_PASSPHRASE # env variable for GPG private key passphrase

    - name: Publish to Apache Maven Central
      run: mvn deploy
      env:
        MAVEN_USERNAME: maven_username123
        MAVEN_CENTRAL_TOKEN: ${{ secrets.MAVEN_CENTRAL_TOKEN }}
        MAVEN_GPG_PASSPHRASE: ${{ secrets.MAVEN_GPG_PASSPHRASE }}

The two settings.xml files created from the above example look like the following.

settings.xml file created for the first deploy to GitHub Packages

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 https://maven.apache.org/xsd/settings-1.0.0.xsd">
  <servers>
    <server>
      <id>github</id>
      <username>${env.GITHUB_ACTOR}</username>
      <password>${env.GITHUB_TOKEN}</password>
    </server>
    <server>
      <id>gpg.passphrase</id>
      <passphrase>${env.GPG_PASSPHRASE}</passphrase>
    </server>
  </servers>
</settings>

settings.xml file created for the second deploy to Apache Maven Central

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 https://maven.apache.org/xsd/settings-1.0.0.xsd">
  <servers>
    <server>
      <id>maven</id>
      <username>${env.MAVEN_USERNAME}</username>
      <password>${env.MAVEN_CENTRAL_TOKEN}</password>
    </server>
    <server>
      <id>gpg.passphrase</id>
      <passphrase>${env.MAVEN_GPG_PASSPHRASE}</passphrase>
    </server>
  </servers>
</settings>

NOTE: The settings.xml file is created in the Actions $HOME/.m2 directory. If you have an existing settings.xml file at that location, it will be overwritten. See below for using the settings-path to change your settings.xml file location.

GPG

If gpg-private-key input is provided, the private key will be written to a file in the runner's temp directory, the private key file will be imported into the GPG keychain, and then the file will be promptly removed before proceeding with the rest of the setup process. A cleanup step will remove the imported private key from the GPG keychain after the job completes regardless of the job status. This ensures that the private key is no longer accessible on self-hosted runners and cannot "leak" between jobs (hosted runners are always clean instances).

GPG key should be imported through: gpg --armor --export-secret-keys YOUR_ID

See the help docs on Publishing a Package for more information on the pom.xml file.

Publishing using Gradle

jobs:

  build:
    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v2

    - name: Set up JDK 1.8
      uses: actions/setup-java@v1

    - name: Build with Gradle
      run: gradle build

    - name: Publish to GitHub Packages
      run: gradle publish
      env:
        USERNAME: ${{ github.actor }}
        PASSWORD: ${{ secrets.GITHUB_TOKEN }}

NOTE: The USERNAME and PASSWORD need to correspond to the credentials environment variables used in the publishing section of your build.gradle.

See the help docs on Publishing a Package with Gradle for more information on the build.gradle configuration file.

Apache Maven with a settings path

When using an Actions self-hosted runner with multiple shared runners the default $HOME directory can be shared by a number runners at the same time which could overwrite existing settings file. Setting the settings-path variable allows you to choose a unique location for your settings file.

jobs:
  build:

    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v2
    - name: Set up JDK 1.8 for Shared Runner
      uses: actions/setup-java@v1
      with:
        java-version: 1.8
        server-id: github # Value of the distributionManagement/repository/id field of the pom.xml
        settings-path: ${{ github.workspace }} # location for the settings.xml file

    - name: Build with Maven
      run: mvn -B package --file pom.xml

    - name: Publish to GitHub Packages Apache Maven
      run: mvn deploy -s $GITHUB_WORKSPACE/settings.xml
      env:
        GITHUB_TOKEN: ${{ github.token }}

License

The scripts and documentation in this project are released under the MIT License

Contributions

Contributions are welcome! See Contributor's Guide