setup-java/README.md

# setup-java

<p align="left">
  <a href="https://github.com/actions/setup-java"><img alt="GitHub Actions status" src="https://github.com/actions/setup-java/workflows/Main%20workflow/badge.svg"></a>
</p>

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](http://static.azul.com/zulu/bin/)
- registering problem matchers for error output

# Usage

See [action.yml](action.yml)

## Basic
```yaml
steps:
- uses: actions/checkout@v1
- uses: actions/setup-java@v1
  with:
    java-version: '9.0.4' # The JDK version to make available on the path. Takes a whole or semver JDK version, or 1.x syntax (e.g. 1.8 => Jdk 8.x). To specify a specific version for JDK 8 or older use the following pattern (8.0.x)
    java-package: jdk # (jre, jdk, or jdk+fx) - defaults to jdk
    architecture: x64 # (x64 or x86) - defaults to x64
- run: java -cp java HelloWorldApp
```

## Local file
```yaml
steps:
- uses: actions/checkout@v1
- 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
```yaml
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@master
      - name: Setup java
        uses: actions/setup-java@v1
        with:
          java-version: ${{ matrix.java }}
      - run: java -cp java HelloWorldApp
```

## Publishing using Apache Maven
```yaml
jobs:
  build:

    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v1
    - name: Set up JDK 1.8
      uses: actions/setup-java@v1
      with:
        java-version: 1.8
        server-id: github # Value of the distributionManagement/repository/id field of the pom.xml
        username: ${{ github.actor }} # username for server authentication
        password: ${{ github.token }} # password or token for authentication
    - name: Build with Maven
      run: mvn -B package --file pom.xml
    - name: Publish to GitHub Packages Apache Maven
      run: mvn deploy
    - 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
        username: maven_username
        password: ${{ secrets.MAVEN_CENTRAL_TOKEN }} # password from secrets store
    - name: Publish to Apache Maven Central
      run: mvn deploy 
```

***NOTE: The `settings.xml` file is created in the Actions $HOME directory. If you have an existing `settings.xml` file at that location, it will be overwritten***	

See the help docs on [Publishing a Package](https://help.github.com/en/github/managing-packages-with-github-packages/configuring-apache-maven-for-use-with-github-packages#publishing-a-package) for more information on the `pom.xml` file.

## Publishing using Gradle
```yaml
jobs:

  build:
    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v1

    - 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](https://help.github.com/en/github/managing-packages-with-github-packages/configuring-gradle-for-use-with-github-packages#example-using-gradle-groovy-for-a-single-package-in-a-repository) for more information on the `build.gradle` configuration file.

## Apache Maven within a Shared Runner

When using an Actions shared runner the default `$HOME` directory can be shared by a number of workflows at the same time which could overwrite existing settings file. Setting the `m2-home` variable allows you to choose a unique location for your settings file.

```yaml
jobs:
  build:

    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v1
    - 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
        username: ${{ github.actor }} # username for server authentication
        password: ${{ github.token }} # password or token for authentication
        m2-home: ${{ $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
```

# License

The scripts and documentation in this project are released under the [MIT License](LICENSE)

# Contributions

Contributions are welcome!  See [Contributor's Guide](docs/contributors.md)