.java-version file support

Hello, I think it would be nice to set java-version default value by reading .java-version file if it exists, what do you think?

This change is inspired by ruby-setup action which already does the same with .ruby-version file. The use of .java-vesion file is popularized by jenv.

I'd like to add here that it would be awesome if the content of that file is used by default if present. Basically making the java-version optional. This would lead to zero configuration. 🤩

I found a way to add support for .java-version files that can act as an escape hatch for everyone who wants this functionality today:

    - name: Export .java-version
      run: |
        java_version=11
        if [[ -f .java-version ]]; then
          java_version=$(head -1 .java-version)
        else
          echo "::error file=.java-version::Missing .java-version file, falling back to default Java version: $java_version"
        fi
        echo "JAVA_VERSION=$java_version" >>"$GITHUB_ENV"
    - uses: actions/setup-java@v2
      with:
        distribution: temurin
        java-version: ${{ env.JAVA_VERSION }}

This can of course be simplified if you use it in a repository where the .java-version file is always guaranteed to exist:

    - name: Export .java-version
      run: echo "JAVA_VERSION=$(head -1 .java-version)" >>"$GITHUB_ENV"
    - uses: actions/setup-java@v2
      with:
        distribution: temurin
        java-version: ${{ env.JAVA_VERSION }}

I got tired and created a wrapping action: https://github.com/Fleshgrinder/setup-java

Hello everyone. Sorry for the late response. We released a version of setup-java to pass a .java-version file through the java-version-file input .

I'm closing this feature request as completed. Related release: https://github.com/actions/setup-java/releases/tag/v3.9.0

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.java-version file support #113

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.java-version file support #113

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Fleshgrinder commented on Aug 27, 2021

Fleshgrinder commented on Jan 21, 2022

Fleshgrinder commented on Oct 7, 2022

dmitry-shibanov commented on Feb 8, 2023

IvanZosimov commented on Mar 21, 2023

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