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setup-r-dependencies: set JAVA_HOME on Windows runners from Java 21 env vars #1100

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setup-r-dependencies: set JAVA_HOME on Windows runners from Java 21 env vars #1100

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Initial plan
Copilot Jul 23, 2026
a8fb692
fix: set JAVA_HOME on Windows in setup-r-dependencies
Copilot Jul 23, 2026
d273325
docs: clarify JAVA_HOME setup note placement
Copilot Jul 23, 2026
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4 changes: 4 additions & 0 deletions setup-r-dependencies/README.md
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Expand Up @@ -301,6 +301,10 @@ On Windows you can usually use `pacman` that is included in Rtools4, or
choco install mariadb
```

`setup-r-dependencies` also sets `JAVA_HOME` to Java 21 on GitHub-hosted
Windows runners (`JAVA_HOME_21_X64` on x64, `JAVA_HOME_21_AARCH64` on arm64)
if `JAVA_HOME` is not already set.

# Installing the latest dependencies

Note that `setup-r-dependencies` does _not_ necessarily install the latest
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14 changes: 14 additions & 0 deletions setup-r-dependencies/action.yaml
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Expand Up @@ -128,6 +128,20 @@ runs:
cat("::endgroup::\n")
shell: Rscript {0}

- name: Set JAVA_HOME (Windows)
if: ${{ runner.os == 'Windows' }}
shell: bash
run: |
if [ -z "${JAVA_HOME:-}" ]; then
arch="${RUNNER_ARCH^^}"
case "${arch}" in
X64) echo "JAVA_HOME=${JAVA_HOME_21_X64}" >> $GITHUB_ENV ;;
# GitHub runners expose ARM64 Java 21 in JAVA_HOME_21_AARCH64.
ARM64) echo "JAVA_HOME=${JAVA_HOME_21_AARCH64}" >> $GITHUB_ENV ;;
*) echo "Warning: unsupported Windows architecture '${arch}', JAVA_HOME not set by setup-r-dependencies." >&2 ;;
esac
fi

- name: Install pak (Unix)
if: ${{ runner.os != 'Windows' && inputs.pak-version != 'none' }}
run: |
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