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docs: note jdkfile approach for Early Access / unreleased JDK builds

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Clarify in advanced-usage that the existing 'jdkfile' distribution can be
used to install Early Access (EA) or other unreleased JDK builds not
provided directly by setup-java, by downloading the archive in a prior
step and pointing jdkFile at it. Adds a concrete EA example.

Addresses #612.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This commit is contained in:
Bruno Borges 2026-06-23 13:05:51 -04:00
parent 668c1ea991
commit 8d6a81aeae
1 changed files with 20 additions and 0 deletions
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docs/advanced-usage.md
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@ -270,6 +270,9 @@ steps:
## Installing Java from local file
If your use-case requires a custom distribution or a version that is not provided by setup-java, you can download it manually and setup-java will take care of the installation and caching on the VM:
> [!NOTE]
> This approach also lets you use builds that setup-java does not provide directly, such as **Early Access (EA)** or other unreleased JDK builds (for example, an upcoming feature release or a loom/valhalla preview build). Download the desired archive in a prior step and point `jdkFile` at it; setup-java will extract, install, and cache it just like a supported distribution. When targeting multiple architectures, select the correct binary per architecture in your workflow (for example, with a build matrix).
```yaml
steps:
- run: |
@ -285,6 +288,23 @@ steps:
- run: java --version
```
For example, to use an **Early Access** build (such as an upcoming feature release from [jdk.java.net](https://jdk.java.net/)) that is not yet available through a regular distribution:
```yaml
steps:
- run: |
download_url="https://download.java.net/java/early_access/jdk25/36/GPL/openjdk-25-ea+36_linux-x64_bin.tar.gz"
wget -O $RUNNER_TEMP/java_package.tar.gz $download_url
- uses: actions/setup-java@v5
with:
distribution: 'jdkfile'
jdkFile: ${{ runner.temp }}/java_package.tar.gz
java-version: '25-ea'
architecture: x64
- run: java --version
```
If your use-case requires a custom distribution (in the example, alpine-linux is used) or a version that is not provided by setup-java and you want to always install the latest version during runtime, then you can use the following code to auto-download the latest JDK, determine the semver needed for setup-java, and setup-java will take care of the installation and caching on the VM:
```yaml