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feat: Add set-default option (#1017)

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* Add set-default option

This option allows to install an additional JDK without making it the
default one.

I have wanted this for quite a long time as I'm running custom GitHub
Actions with Java, which might require a specific JDK and I don't want
to pollute the JDK that is used by the overall workflow calling the
action.
And I'm apparently not alone as there was a preexisting issue.

Fixes #560

* Dedupe setJavaDefault and document multi-version/toolchain behavior

- Refactor setJavaDefault to delegate shared output/env logic to
  setJavaEnvironment, avoiding duplication between the two.
- Document that set-default applies to all JDKs in a multiline
  java-version, and that installed JDKs remain registered in Maven
  toolchains regardless of set-default.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* test: fix Prettier formatting in base-installer test

Resolves the failing 'Basic validation / build' format-check on
__tests__/distributors/base-installer.test.ts (line exceeded print width).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Bruno Borges <brborges@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This commit is contained in:
Guillaume Smet
2026-07-07 18:38:57 +02:00
committed by GitHub
parent a50fdccef1
commit 6657b99340
12 changed files with 280 additions and 14 deletions
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README.md
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@@ -41,6 +41,8 @@ For more details, see the full release notes on the [releases page](https://git
- `check-latest`: Setting this option makes the action to check for the latest available version for the version spec.
- `set-default`: Set to `false` to install a JDK without making it the default. When `false`, `JAVA_HOME` and `PATH` are not updated, but `JAVA_HOME_<major>_<arch>` is still set so the JDK remains discoverable. Default value: `true`. See [Installing JDK without setting as default](docs/advanced-usage.md#Installing-JDK-without-setting-as-default) for more details.
- `verify-signature`: Verifies downloaded Java package signatures when supported by the selected distribution. Currently supported for `temurin` and `microsoft`. If set to `true` for unsupported distributions, the action fails.
- `verify-signature-public-key`: ASCII-armored GPG public key used to verify the downloaded package signature. Overrides the default bundled key for the selected distribution.