setup-java/README.md

Setup Java

The setup-java 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
• Caching dependencies managed by Apache Maven
• Caching dependencies managed by Gradle
• Caching dependencies managed by sbt
• Maven Toolchains declaration for specified JDK versions

This action allows you to work with Java and Scala projects.

V2 vs V1

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

Usage

• java-version: (required) The Java version to set up. Takes a whole or semver Java version.

• distribution: (required) Java distribution.

• java-package: The packaging variant of the choosen distribution. Possible values: jdk, jre, jdk+fx, jre+fx. Default value: jdk.

• architecture: The target architecture of the package. Possible values: x86, x64, armv7, aarch64, ppc64le. Default value: x64.

• jdkFile: If a use-case requires a custom distribution setup-java uses the compressed JDK from the location pointed by this input and will take care of the installation and caching on the VM.

• check-latest: Setting this option makes the action to check for the latest available version for the version spec.

• cache: Quick setup caching for the dependencies managed through one of the predifined package managers. It can be one of "maven", "gradle" or "sbt".

Maven options

The action has a bunch of inputs to generate maven's settings.xml on the fly and pass the values to Apache Maven GPG Plugin as well as Apache Maven Toolchains. See advanced usage for more.

• overwrite-settings: By default action overwrites the settings.xml. In order to skip generation of file if it exists set this to false.

• server-id: ID of the distributionManagement repository in the pom.xml file. Default is github.

• server-username: Environment variable name for the username for authentication to the Apache Maven repository. Default is GITHUB_ACTOR.

• server-password: Environment variable name for password or token for authentication to the Apache Maven repository. Default is GITHUB_TOKEN.

• settings-path: Maven related setting to point to the diractory where the settings.xml file will be written. Default is ~/.m2.

• gpg-private-key: GPG private key to import. Default is empty string.'

• gpg-passphrase: description: 'Environment variable name for the GPG private key passphrase. Default is GPG_PASSPHRASE.

• mvn-toolchain-id: Name of Maven Toolchain ID if the default name of ${distribution}_${java-version} is not wanted.

• mvn-toolchain-vendor: Name of Maven Toolchain Vendor if the default name of ${distribution} is not wanted.

Basic Configuration

Eclipse Temurin

steps:
- uses: actions/checkout@v3
- uses: actions/setup-java@v3
  with:
    distribution: 'temurin' # See 'Supported distributions' for available options
    java-version: '17'
- run: java HelloWorldApp.java

Azul Zulu OpenJDK

steps:
- uses: actions/checkout@v3
- uses: actions/setup-java@v3
  with:
    distribution: 'zulu' # See 'Supported distributions' for available options
    java-version: '17'
- run: java HelloWorldApp.java

Supported version syntax

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

• major versions: 8, 11, 16, 17
• more specific versions: 17.0, 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
temurin	Eclipse Temurin	Link	Link
zulu	Azul Zulu OpenJDK	Link	Link
adopt or adopt-hotspot	AdoptOpenJDK Hotspot	Link	Link
adopt-openj9	AdoptOpenJDK OpenJ9	Link	Link
liberica	Liberica JDK	Link	Link
microsoft	Microsoft Build of OpenJDK	Link	Link
corretto	Amazon Corretto Build of OpenJDK	Link	Link
oracle	Oracle JDK	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.

NOTE: AdoptOpenJDK got moved to Eclipse Temurin and won't be updated anymore. It is highly recommended to migrate workflows from adopt to temurin to keep receiving software and security updates. See more details in the Good-bye AdoptOpenJDK post.

NOTE: For Azul Zulu OpenJDK architectures x64 and arm64 are mapped to x86 / arm with proper hw_bitness.

Caching packages dependencies

The action has a built-in functionality for caching and restoring dependencies. It uses actions/cache under hood for caching dependencies but requires less configuration settings. Supported package managers are gradle, maven and sbt. The format of the used cache key is setup-java-${{ platform }}-${{ packageManager }}-${{ fileHash }}, where the hash is based on the following files:

• gradle: **/*.gradle*, **/gradle-wrapper.properties, buildSrc/**/Versions.kt, buildSrc/**/Dependencies.kt, and gradle/*.versions.toml
• maven: **/pom.xml
• sbt: all sbt build definition files **/*.sbt, **/project/build.properties, **/project/**.{scala,sbt}

The workflow output cache-hit is set to indicate if an exact match was found for the key as actions/cache does.

The cache input is optional, and caching is turned off by default.

Caching gradle dependencies

steps:
- uses: actions/checkout@v3
- uses: actions/setup-java@v3
  with:
    distribution: 'temurin'
    java-version: '17'
    cache: 'gradle'
- run: ./gradlew build --no-daemon

Caching maven dependencies

steps:
- uses: actions/checkout@v3
- uses: actions/setup-java@v3
  with:
    distribution: 'temurin'
    java-version: '17'
    cache: 'maven'
- name: Build with Maven
  run: mvn -B package --file pom.xml

Caching sbt dependencies

steps:
- uses: actions/checkout@v3
- uses: actions/setup-java@v3
  with:
    distribution: 'temurin'
    java-version: '17'
    cache: 'sbt'
- name: Build with SBT
  run: sbt package

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@v3
- uses: actions/setup-java@v3
  with:
    distribution: 'temurin'
    java-version: '17'
    check-latest: true
- run: java HelloWorldApp.java

Testing against different Java versions

jobs:
  build:
    runs-on: ubuntu-20.04
    strategy:
      matrix:
        java: [ '8', '11', '17' ]
    name: Java ${{ matrix.Java }} sample
    steps:
      - uses: actions/checkout@v3
      - name: Setup java
        uses: actions/setup-java@v3
        with:
          distribution: '<distribution>'
          java-version: ${{ matrix.java }}
      - run: java HelloWorldApp.java

Install multiple JDKs

All versions are added to the PATH. The last version will be used and available globally. Other Java versions can be accessed through env variables with such specification as 'JAVA_HOME_{{ MAJOR_VERSION }}_{{ ARCHITECTURE }}'.

    steps:
      - uses: actions/setup-java@v3
        with:
          distribution: '<distribution>'
          java-version: |
            8
            11
            15            

Using Maven Toolchains

In the example above multiple JDKs are installed for the same job. The result after the last JDK is installed is a Maven Toolchains declaration containing references to all three JDKs. The values for id, version, and vendor of the individual Toolchain entries are the given input values for distribution and java-version (vendor being the combination of ${distribution}_${java-version}) by default.

Advanced Configuration

• Selecting a Java distribution
  • Eclipse Temurin
  • Adopt
  • Zulu
  • Liberica
  • Microsoft
  • Amazon Corretto
• 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
• Modifying Maven Toolchains

License

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

Contributions

Contributions are welcome! See Contributor's Guide