setup-java/README.md

setup-java

This action provides the following functionality for GitHub Actions runners:

• Downloading and setting up a requested version of Java. See Usage for a list of supported distributions
• Extracting and caching custom version of Java from a local file
• Configuring runner for publishing using Apache Maven
• Configuring runner for publishing using Gradle
• Configuring runner for using GPG private key
• Registering problem matchers for error output

V2 vs V1

• V2 supports custom distributions and provides support for Zulu OpenJDK and Adopt OpenJDK out of the box. V1 supports only Zulu OpenJDK
• V2 requires you to specify distribution along with the version. V1 defaults to Zulu OpenJDK, only version input is required. Follow the migration guide to switch from V1 to V2

Usage

Inputs java-version and distribution are mandatory. See Supported distributions section for a list of available options.

Basic

Adopt OpenJDK

steps:
- uses: actions/checkout@v2
- uses: actions/setup-java@v2-preview
  with:
    distribution: 'adopt' # See 'Supported distributions' for available options
    java-version: '11'
- run: java -cp java HelloWorldApp

Zulu OpenJDK

steps:
- uses: actions/checkout@v2
- uses: actions/setup-java@v2-preview
  with:
    distribution: 'zulu' # See 'Supported distributions' for available options
    java-version: '11'
- run: java -cp java HelloWorldApp

Supported version syntax

The java-version input supports an exact version or a version range using SemVer notation:

• major versions: 8, 11, 15
• more specific versions: 11.0, 11.0.4, 8.0.232, 8.0.282+8
• early access (EA) versions: 15-ea, 15.0.0-ea, 15.0.0-ea.2, 15.0.0+2-ea

Supported distributions

Currently, the following distributions are supported:

Keyword	Distribution	Official site	License
zulu	Zulu OpenJDK	Link	Link
adopt	Adopt OpenJDK	Link	Link

NOTE: The different distributors can provide discrepant list of available versions / supported configurations. Please refer to the official documentation to see the list of supported versions.

Check latest

In the basic examples above, the check-latest flag defaults to false. When set to false, the action tries to first resolve a version of Java from the local tool cache on the runner. If unable to find a specific version in the cache, the action will download a version of Java. Use the default or set check-latest to false if you prefer a faster more consistent setup experience that prioritizes trying to use the cached versions at the expense of newer versions sometimes being available for download.

If check-latest is set to true, the action first checks if the cached version is the latest one. If the locally cached version is not the most up-to-date, the latest version of Java will be downloaded. Set check-latest to true if you want the most up-to-date version of Java to always be used. Setting check-latest to true has performance implications as downloading versions of Java is slower than using cached versions.

For Java distributions that are not cached on Hosted images, check-latest always behaves as true and downloads Java on-flight. Check out Hosted Tool Cache for more details about pre-cached Java versions.

steps:
- uses: actions/checkout@v2
- uses: actions/setup-java@v2-preview
  with:
    distribution: 'adopt'
    java-version: '11'
    check-latest: true
- run: java -cp java HelloWorldApp

Testing against different Java versions

jobs:
  build:
    runs-on: ubuntu-20.04
    strategy:
      matrix:
        java: [ '8', '11', '13', '15' ]
    name: Java ${{ matrix.Java }} sample
    steps:
      - uses: actions/checkout@v2
      - name: Setup java
        uses: actions/setup-java@v2-preview
        with:
          distribution: '<distribution>'
          java-version: ${{ matrix.java }}
      - run: java -cp java HelloWorldApp

Advanced

• Selecting a Java distribution
  • Adopt
  • Zulu
• Installing custom Java package type
• Installing custom Java architecture
• Installing custom Java distribution from local file
• Testing against different Java distributions
• Testing against different platforms
• Publishing using Apache Maven
• Publishing using Gradle
• Hosted Tool Cache

License

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

Contributions

Contributions are welcome! See Contributor's Guide