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

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

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

Note: 4-digit notation will always force action to skip checking pre-cached versions and download version in runtime.

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.

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

License

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

Contributions

Contributions are welcome! See Contributor's Guide