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Instruction to download custom distribution JDK and install #500

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Jun 20, 2023
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Instruction to download custom distribution JDK and install #500

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Auto download latest version of custom distribution JDK during run time
ragsmpl Jun 10, 2023
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Update advanced-usage.md
ragsmpl Jun 10, 2023
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ragsmpl Jun 16, 2023
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Expand Up @@ -168,6 +168,31 @@ steps:
- run: java -cp java HelloWorldApp
```

If your use-case reuires a custom distribution (in the example alpine-linux is used) or a version that is not provided by setup-java and always install the latest version during runtime, then you can use below code to auto download the latest JDK, determine the semver needed for the setup-java and setup-java will take care of the installation and caching on the VM:
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```yaml
steps:
- name: fetch latest temurin JDK
id: fetch_latest_jdk
run: |
major_version={{ env.JAVA_VERSION }} # Example 8 or 11 or 17
cd $RUNNER_TEMP
response=$(curl -s "https://api.github.com/repos/adoptium/temurin${major_version}-binaries/releases")
latest_jdk_download_url=$(echo "$response" | jq -r '.[0].assets[] | select(.name | contains("jdk_x64_alpine-linux") and endswith(".tar.gz")) | .browser_download_url')
curl -Ls "$latest_jdk_download_url" -o java_package.tar.gz
latest_jdk_json_url=$(jdk_download_url "$response" | jq -r '.[0].assets[] | select(.name | contains("jdk_x64_alpine-linux") and endswith(".tar.gz.json")) | .browser_download_url')
latest_semver_version=$(curl -sL $latest_jdk_json_url | jq -r 'version.semver')
echo "java_version=$latest_semver_version" >> "$GITHUB_OUTPUT"

- uses: actions/setup-java@v3
with:
distribution: 'jdkfile'
jdkFile: ${{ runner.temp }}/java_package.tar.gz
java-version: {{ steps.fetch_latest_jdk.outputs.java_version }}
architecture: x64
- run: java -cp java HelloWorldApp
```

## Testing against different Java distributions
**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.
```yaml
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