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Support pinning java-version as "latest"

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Add a `latest` alias for the `java-version` input that floats to the newest
available stable (GA) release. It is normalized to the SemVer wildcard at the
base-installer layer and always resolves from remote (like `check-latest: true`).

List-based distributions resolve it automatically via the existing newest-first
matching. Corretto selects its newest available major; Oracle and GraalVM look up
the newest GA major via the Adoptium API and request it, failing with an actionable
error if that major isn't published yet. The jdkfile distribution rejects `latest`.

Closes #832

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
This commit is contained in:
Bruno Borges
2026-07-09 15:20:59 -04:00
parent 548a822bee
commit 71ee2e9aa6
18 changed files with 441 additions and 19 deletions
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README.md
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@@ -105,6 +105,13 @@ The `java-version` input supports an exact version or a version range using [Sem
- major versions, such as: `8`, `11`, `16`, `17`, `21`, `25`
- more specific versions: `8.0.282+8`, `8.0.232`, `11.0`, `11.0.4`, `17.0`
- early access (EA) versions: `15-ea`, `15.0.0-ea`
- the `latest` alias, which floats to the newest available stable (GA) release
> [!NOTE]
> - `latest` always resolves the newest version from the distribution's remote metadata (it behaves like `check-latest: true`), so it ignores any older version already present in the runner tool cache. This has the same performance trade-off described in [Check latest](#check-latest).
> - `latest` is only supported through the `java-version` input, not through `java-version-file`, and it resolves stable (GA) releases only — it cannot be combined with `-ea`.
> - The `jdkfile` distribution does not support `latest`, as it installs from a local file.
> - For `oracle` and `graalvm`, `latest` resolves the newest GA major version via the Adoptium API and then requests it from the distribution. If that distribution hasn't published the newest major yet, the action fails and asks you to specify a concrete version. Note the Oracle JDK license caveat below still applies to a floating `latest`.
#### Supported distributions
Currently, the following distributions are supported: