Fix alpine failures by switching default back to only warn on verification failures. To prevent build failures due to missing GPG or rotated vendor keys. (#1262 )

Also allow multiple GPG keys to be provided. Co-authored-by: John <1615532+johnoliver@users.noreply.github.com>
Fix Temurin EA E2E signature verification (#1260 )
2026-09-04 19:15:15 +02:00 · 2026-09-03 13:27:24 -04:00 · 2026-09-03 10:34:10 -04:00 · 2026-09-03 07:39:25 -04:00 · 2026-08-24 13:26:11 -04:00 · 2026-08-24 12:32:37 -04:00
41 changed files with 1207 additions and 359 deletions
@@ -1,22 +1,25 @@
-# To get started with Dependabot version updates, you'll need to specify which
-# package ecosystems to update and where the package manifests are located.
-# Please see the documentation for all configuration options:
-# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
-
 version: 2
 updates:
-  # Enable version updates for npm
  - package-ecosystem: 'npm'
-    # Look for `package.json` and `lock` files in the `root` directory
    directory: '/'
-    # Check the npm registry for updates every day (weekdays)
    schedule:
-      interval: 'weekly'
+      interval: 'monthly'
+    cooldown:
+      default-days: 7
+    groups:
+      monthly-npm-updates:
+        applies-to: 'version-updates'
+        patterns:
+          - '*'

-  # Enable version updates for GitHub Actions
  - package-ecosystem: 'github-actions'
-    # Workflow files stored in the default location of `.github/workflows`
-    # You don't need to specify `/.github/workflows` for `directory`. You can use `directory: "/"`.
    directory: '/'
    schedule:
-      interval: 'weekly'
+      interval: 'monthly'
+    cooldown:
+      default-days: 7
+    groups:
+      monthly-actions-updates:
+        applies-to: 'version-updates'
+        patterns:
+          - '*'
@@ -24,6 +24,7 @@ jobs:
  warm-caches:
    name: Warm ${{ matrix.tool }} ${{ matrix.profile }} caches (${{ matrix.os }})
    runs-on: ${{ matrix.os }}
+    cache-mode: write-only
    strategy:
      fail-fast: false
      matrix:
@@ -65,6 +66,7 @@ jobs:
    name: Benchmark ${{ matrix.tool }} ${{ matrix.profile }} (${{ matrix.os }})
    needs: warm-caches
    runs-on: ${{ matrix.os }}
+    cache-mode: read
    strategy:
      fail-fast: false
      matrix:
@@ -21,6 +21,7 @@ defaults:
 jobs:
  gradle-save:
    runs-on: ${{ matrix.os }}
+    cache-mode: write-only
    strategy:
      fail-fast: false
      matrix:
@@ -48,6 +49,7 @@ jobs:
          bash __tests__/check-dir.sh "$HOME/.gradle/wrapper/dists"
  gradle-restore:
    runs-on: ${{ matrix.os }}
+    cache-mode: read
    strategy:
      fail-fast: false
      matrix:
@@ -72,6 +74,7 @@ jobs:
        run: bash __tests__/check-dir.sh "$HOME/.gradle/wrapper/dists"
  maven-save:
    runs-on: ${{ matrix.os }}
+    cache-mode: write-only
    strategy:
      fail-fast: false
      matrix:
@@ -97,6 +100,7 @@ jobs:
          bash __tests__/check-dir.sh "$HOME/.m2/wrapper/dists"
  maven-restore:
    runs-on: ${{ matrix.os }}
+    cache-mode: read
    strategy:
      fail-fast: false
      matrix:
@@ -121,6 +125,7 @@ jobs:
        run: bash __tests__/check-dir.sh "$HOME/.m2/wrapper/dists"
  sbt-save:
    runs-on: ${{ matrix.os }}
+    cache-mode: write-only
    defaults:
      run:
        shell: bash
@@ -160,6 +165,7 @@ jobs:
        run: bash "$GITHUB_WORKSPACE/__tests__/check-dir.sh" "$HOME/.cache/coursier"
  sbt-restore:
    runs-on: ${{ matrix.os }}
+    cache-mode: read
    defaults:
      run:
        shell: bash
@@ -194,6 +200,7 @@ jobs:
        run: bash "$GITHUB_WORKSPACE/__tests__/check-dir.sh" "$HOME/.cache/coursier"
  gradle1-save:
    runs-on: ${{ matrix.os }}
+    cache-mode: write-only
    strategy:
      fail-fast: false
      matrix:
@@ -222,6 +229,7 @@ jobs:
          bash __tests__/check-dir.sh "$HOME/.gradle/wrapper/dists"
  gradle1-restore:
    runs-on: ${{ matrix.os }}
+    cache-mode: read
    strategy:
      fail-fast: false
      matrix:
@@ -246,6 +254,7 @@ jobs:
        run: bash __tests__/check-dir.sh "$HOME/.gradle/wrapper/dists"
  gradle2-restore:
    runs-on: ${{ matrix.os }}
+    cache-mode: read
    strategy:
      fail-fast: false
      matrix:
@@ -268,6 +277,7 @@ jobs:
        run: bash __tests__/check-dir.sh "$HOME/.gradle/caches" absent
  maven1-save:
    runs-on: ${{ matrix.os }}
+    cache-mode: write-only
    strategy:
      fail-fast: false
      matrix:
@@ -294,6 +304,7 @@ jobs:
          bash __tests__/check-dir.sh "$HOME/.m2/wrapper/dists"
  maven1-restore:
    runs-on: ${{ matrix.os }}
+    cache-mode: read
    strategy:
      fail-fast: false
      matrix:
@@ -318,6 +329,7 @@ jobs:
        run: bash __tests__/check-dir.sh "$HOME/.m2/wrapper/dists"
  maven2-restore:
    runs-on: ${{ matrix.os }}
+    cache-mode: read
    strategy:
      fail-fast: false
      matrix:
@@ -342,6 +354,7 @@ jobs:
        run: bash __tests__/check-dir.sh "$HOME/.m2/repository" absent
  sbt1-save:
    runs-on: ${{ matrix.os }}
+    cache-mode: write-only
    defaults:
      run:
        shell: bash
@@ -382,6 +395,7 @@ jobs:
        run: bash "$GITHUB_WORKSPACE/__tests__/check-dir.sh" "$HOME/.cache/coursier"
  sbt1-restore:
    runs-on: ${{ matrix.os }}
+    cache-mode: read
    defaults:
      run:
        shell: bash
@@ -416,6 +430,7 @@ jobs:
        run: bash "$GITHUB_WORKSPACE/__tests__/check-dir.sh" "$HOME/.cache/coursier"
  sbt2-restore:
    runs-on: ${{ matrix.os }}
+    cache-mode: read
    defaults:
      run:
        shell: bash
@@ -450,6 +465,7 @@ jobs:
        run: bash "$GITHUB_WORKSPACE/__tests__/check-dir.sh" "$HOME/.cache/coursier" absent
  custom-maven-path-save:
    runs-on: ubuntu-latest
+    cache-mode: write-only
    steps:
      - name: Checkout
        uses: actions/checkout@v7
@@ -474,6 +490,7 @@ jobs:
          bash __tests__/check-dir.sh "$RUNNER_TEMP/setup-java-custom-maven-repository"
  custom-maven-path-restore:
    runs-on: ubuntu-latest
+    cache-mode: read
    needs: custom-maven-path-save
    steps:
      - name: Checkout
@@ -71,7 +71,7 @@ jobs:
            version: 25
          - distribution: oracle
            os: macos-15-intel
-            version: 17
+            version: 21
          - distribution: oracle
            os: windows-latest
            version: 21
@@ -154,8 +154,8 @@ jobs:
        version: ['21', '17']
    steps:
      - *checkout_step
-      - name: Install bash
-        run: apk add --no-cache bash
+      - name: Install bash and GnuPG
+        run: apk add --no-cache bash gnupg
      - name: setup-java
        uses: ./
        id: setup-java
@@ -340,6 +340,7 @@ jobs:
        with:
          java-version: ${{ matrix.version }}
          distribution: ${{ matrix.distribution }}
+          verify-signature: ${{ matrix.distribution == 'temurin' && contains(matrix.version, '-ea') && 'false' || '' }}
      - name: Verify Java
        env:
          JAVA_VERSION: ${{ matrix.version }}
@@ -1,6 +1,6 @@
 ---
 name: fast-xml-parser
-version: 5.10.1
+version: 5.11.0
 type: npm
 summary: Validate XML, Parse XML, Build XML without C/C++ based libraries
 homepage:
@@ -1,6 +1,6 @@
 ---
 name: strnum
-version: 2.4.1
+version: 2.4.2
 type: npm
 summary: Parse String to Number based on configuration
 homepage:
@@ -9,22 +9,13 @@ Set up Java for GitHub Actions workflows. `setup-java` installs a requested Java
 ```yaml
 steps:
  - uses: actions/checkout@v7
-  - uses: actions/setup-java@v5
+  - uses: actions/setup-java@v6
    with:
      distribution: temurin
      java-version: '25'
  - run: java --version
 ```

-> [!NOTE]
-> V6 is still in development on the `main` branch and is not yet recommended for production workflows. To use it, you must explicitly reference the `main` branch in your workflow, as in 
->
-> ```yaml
-> - uses: actions/setup-java@main
-> ```
-> 
-> For production workflows, it is recommended to use the latest stable release `v5`.
-
 ## Contents

 - [What it does](#what-it-does)
@@ -54,15 +45,20 @@ steps:

 ## What's new

-### V6 (in development)
+### V6

 - Migrated the action implementation to ESM to support the latest `@actions/*` packages.
- Added the `oracle-openjdk` distribution for OpenJDK builds from Oracle.
+- Added Oracle OpenJDK (`oracle-openjdk`), Red Hat Build of OpenJDK (`redhat`), and Liberica Native Image Kit (`liberica-nik`), and expanded Tencent Kona support through JDK 25.
 - Added `java-version: latest` to resolve the newest stable GA release from the distribution's remote metadata.
- JDK downloads now automatically verify authoritative checksums for [supported distributions](#download-integrity-and-signatures).
+- Expanded install compatibility with JEP 322 multi-field versions such as `18.0.1.1`, Temurin `jdk+jmods` packages, and native musl artifacts on Alpine for Dragonwell, Corretto, Zulu, and Liberica.
+- JDK downloads now automatically verify authoritative checksums. Package signature verification is supported for Temurin and Microsoft builds, with configurable strict enforcement.
 - Added `force-download: true` to bypass the tool cache and perform a reproducible fresh install.
 - Dependency caching now supports custom paths with `cache-path` and restore-only operation with `cache-read-only: true`.
+- Dependency cache keys now include `.mvn/extensions.xml` and `gradle.properties`, preventing stale restores when Maven extensions or Gradle dependency properties change.
 - Downloaded JDKs are now [cached](#caching-jdk-installations) automatically when `cache` is set; use `cache-jdk` to enable or disable it independently.
+- Warm JDK-cached jobs can reuse cached release metadata, avoiding vendor API calls while retaining a stale-metadata fallback for vendor outages and rate limits.
+- Maven configuration now supports multiple server credentials and custom dependency-resolution repositories.
+- Maven signing keys are imported into an isolated temporary GPG home instead of the runner's default keyring.
 - Set `problem-matcher: false` to disable Java compiler and uncaught-exception annotations.
 - GraalVM distributions now set `GRAALVM_HOME` in addition to `JAVA_HOME`.
 - Invalid boolean values, unsupported distribution/package/platform combinations, and mismatched Maven toolchain ID counts now fail with targeted errors.
@@ -73,6 +69,7 @@ steps:
 - Deprecated aliases still work, but emit warnings.
 - Maven GPG passphrases are now passed through `gpg.passphraseEnvName` instead of a deprecated `gpg.passphrase` server entry in `settings.xml`. This requires `maven-gpg-plugin` 3.2.0 or newer. See [GPG](docs/advanced-usage.md#gpg).
 - Legacy AdoptOpenJDK distributions were removed. Use `temurin` instead of `adopt` or `adopt-hotspot`, and `semeru` instead of `adopt-openj9`.
+- See the [complete V6 release notes](https://github.com/actions/setup-java/releases/tag/v6.0.0) for all enhancements and fixes.

 ### V5

@@ -89,7 +86,7 @@ steps:
 ### Older versions

 > [!WARNING]
-> `actions/setup-java` versions `v1` through `v4` are deprecated. Upgrade workflows to `actions/setup-java@v5`, the latest stable release.
+> `actions/setup-java` versions `v1` through `v4` are deprecated. Upgrade workflows to `actions/setup-java@v6`, the latest stable release.

 ## Usage

@@ -98,7 +95,7 @@ steps:
 ```yaml
 steps:
  - uses: actions/checkout@v7
-  - uses: actions/setup-java@v5
+  - uses: actions/setup-java@v6
    with:
      distribution: temurin
      java-version: '25'
@@ -110,7 +107,7 @@ steps:
 ```yaml
 steps:
  - uses: actions/checkout@v7
-  - uses: actions/setup-java@v5
+  - uses: actions/setup-java@v6
    with:
      distribution: microsoft
      java-version: '25'
@@ -122,7 +119,7 @@ steps:
 ```yaml
 steps:
  - uses: actions/checkout@v7
-  - uses: actions/setup-java@v5
+  - uses: actions/setup-java@v6
    with:
      distribution: temurin
      java-version-file: .java-version
@@ -136,7 +133,7 @@ Supported version files are `.java-version`, `.tool-versions`, and `.sdkmanrc`.
 ```yaml
 steps:
  - uses: actions/checkout@v7
-  - uses: actions/setup-java@v5
+  - uses: actions/setup-java@v6
    with:
      distribution: temurin
      java-version: latest
@@ -159,8 +156,8 @@ steps:
 | `force-download` | Always download Java and replace any matching version in the tool cache. | `false` |
 | `set-default` | Add Java to `PATH` and set `JAVA_HOME`. When `false`, only version-specific `JAVA_HOME_<major>_<arch>` variables are set. | `true` |
 | `problem-matcher` | Register Java compiler and uncaught exception problem matchers. | `true` |
-| `verify-signature` | Verify downloaded Java package signatures when supported. Currently supported for `temurin` and `microsoft`. | `false` |
-| `verify-signature-public-key` | ASCII-armored GPG public key to use for signature verification. Overrides the bundled key. | |
+| `verify-signature` | Verify downloaded Java package signatures when supported. Explicitly setting this to `true` makes verification failures fatal. | Distribution-dependent; see [Download integrity and signatures](#download-integrity-and-signatures) |
+| `verify-signature-public-key` | One or more ASCII-armored GPG public keys used for signature verification. Concatenate multiple armored key blocks. Custom keys replace the bundled distribution keys. | |
 | `token` | Token for fetching GitHub.com-hosted version manifests, useful on GitHub Enterprise Server when unauthenticated requests are rate-limited. | `${{ github.token }}` on GitHub.com; empty string on GHES |
 | `cache` | Enable dependency caching for `maven`, `gradle`, or `sbt`. | |
 | `cache-jdk` | Cache downloaded JDK installations between jobs. When omitted, JDK caching is enabled only if `cache` is set. Set explicitly to `true` or `false` to override. | Enabled when `cache` is set |
@@ -250,7 +247,34 @@ GitHub-hosted runners primarily pre-cache Eclipse Temurin JDKs. See the installe

 Distributions or individual releases without an authoritative checksum continue to install normally, with the omission reported in debug logs. Installations resolved directly from the runner tool cache — including JDKs preinstalled on the runner image and JDKs installed by an earlier step of the same job — are not downloaded again and are not reverified, even when `verify-signature: true` is set. Use `force-download: true` to always download and verify the archive.

-Use `verify-signature: true` to verify package signatures for distributions that support it. Currently supported distributions are `temurin` and `microsoft`; setting it for an unsupported distribution fails the workflow.
+Package signature verification is supported for `temurin` and `microsoft`. When `verify-signature` is omitted, the action checks the signature and warns if GPG is unavailable or verification fails, but does not enforce the result. Explicitly setting `verify-signature: true` enforces verification and makes these failures fatal. Setting `verify-signature: true` for an unsupported distribution also fails the workflow.
+
+> [!WARNING]
+> Requesting explicit signature verification with verify-signature can fail a build after an unexpected but legitimate vendor signing-key rotation, because the action's bundled keys may not yet include the new key. Confirm a new key through the vendor's trusted documentation before using it.
+
+After confirming a legitimate rotation, configure the updated key with `verify-signature-public-key`. The input accepts one or more ASCII-armored public keys; concatenate complete armored key blocks when both old and new vendor keys are needed during a transition. Custom keys replace, rather than extend, the keys bundled with the selected distribution.
+
+```yaml
+- uses: actions/setup-java@v6
+  with:
+    distribution: temurin
+    java-version: '25'
+    verify-signature: true
+    verify-signature-public-key: |
+      -----BEGIN PGP PUBLIC KEY BLOCK-----
+      ...vendor key material...
+      -----END PGP PUBLIC KEY BLOCK-----
+```
+
+As a temporary fallback while a legitimate rotation is being investigated, set `verify-signature: false`. This disables package signature verification, although authoritative checksum verification still applies when the vendor publishes a checksum.
+
+```yaml
+- uses: actions/setup-java@v6
+  with:
+    distribution: temurin
+    java-version: '25'
+    verify-signature: false
+```

 ## Caching

@@ -267,7 +291,7 @@ Set `cache` to `maven`, `gradle`, or `sbt` to cache dependencies with minimal co
 ```yaml
 steps:
  - uses: actions/checkout@v7
-  - uses: actions/setup-java@v5
+  - uses: actions/setup-java@v6
    with:
      distribution: temurin
      java-version: '25'
@@ -286,7 +310,7 @@ The primary dependency cache key is `setup-java-<runner-os>-<node-arch>-<package
 Use `cache-dependency-path` to override the files used for key hashing, especially in monorepos:

 ```yaml
- uses: actions/setup-java@v5
+- uses: actions/setup-java@v6
  with:
    distribution: temurin
    java-version: '25'
@@ -299,7 +323,7 @@ Use `cache-dependency-path` to override the files used for key hashing, especial
 Use `cache-path` when the build tool stores dependencies outside the default location:

 ```yaml
- uses: actions/setup-java@v5
+- uses: actions/setup-java@v6
  with:
    distribution: temurin
    java-version: '25'
@@ -338,7 +362,7 @@ The JDK cache stores the downloaded JDK installation so later runs skip the down
 Set `cache-read-only: true` to restore dependency, wrapper, and JDK caches without saving changes in the post action. This is useful for pull requests, merge queues, short-lived branches, and matrix fan-out jobs that should only consume caches produced elsewhere.

 ```yaml
- uses: actions/setup-java@v5
+- uses: actions/setup-java@v6
  with:
    distribution: temurin
    java-version: '25'
@@ -354,7 +378,7 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v7
-      - uses: actions/setup-java@v5
+      - uses: actions/setup-java@v6
        with:
          distribution: temurin
          java-version: '25'
@@ -369,7 +393,7 @@ jobs:
        goal: [test, verify, package]
    steps:
      - uses: actions/checkout@v7
-      - uses: actions/setup-java@v5
+      - uses: actions/setup-java@v6
        with:
          distribution: temurin
          java-version: '25'
@@ -387,7 +411,7 @@ env:
  SEGMENT_DOWNLOAD_TIMEOUT_MINS: '5'
 steps:
  - uses: actions/checkout@v7
-  - uses: actions/setup-java@v5
+  - uses: actions/setup-java@v6
    with:
      distribution: temurin
      java-version: '25'
@@ -401,7 +425,7 @@ Install multiple Java versions by providing a multiline `java-version` value. Al

 ```yaml
 steps:
-  - uses: actions/setup-java@v5
+  - uses: actions/setup-java@v6
    with:
      distribution: temurin
      java-version: |
@@ -428,7 +452,7 @@ jobs:
    name: Java ${{ matrix.java }}
    steps:
      - uses: actions/checkout@v7
-      - uses: actions/setup-java@v5
+      - uses: actions/setup-java@v6
        with:
          distribution: temurin
          java-version: ${{ matrix.java }}
@@ -445,7 +469,7 @@ jobs:
 ```yaml
 steps:
  - uses: actions/checkout@v7
-  - uses: actions/setup-java@v5
+  - uses: actions/setup-java@v6
    with:
      distribution: temurin
      java-version: '25'
@@ -467,7 +491,7 @@ required. See [Resolving Maven dependencies from custom repositories](docs/advan
 ```yaml
 steps:
  - uses: actions/checkout@v7
-  - uses: actions/setup-java@v5
+  - uses: actions/setup-java@v6
    with:
      distribution: temurin
      java-version: '25'
@@ -522,7 +546,7 @@ The scripts and documentation in this project are released under the [MIT Licens

 ## Contributions

-Contributions are welcome. See our [Contributor's Guide](docs/contributors.md).
+Contributions are welcome. See our [Contributor's Guide](docs/CONTRIBUTING.md).

 ## Code of Conduct

@@ -393,7 +393,7 @@ function createRegisteredJdk(version = '21.0.8+9') {
    architecture: 'x64',
    version,
    source: `sha256:${path.basename(root)}`,
-    verification: 'unverified',
+    verification: 'disabled',
    path: jdkPath
  };
  registerJdk(jdk);
@@ -71,8 +71,11 @@ jest.unstable_mockModule('@actions/tool-cache', () => ({
 }));

 jest.unstable_mockModule('../../src/jdk-cache.js', () => ({
-  getJdkVerificationIdentity: jest.fn((verified: boolean, key?: string) =>
-    verified ? (key ? 'verified:custom' : 'verified:bundled') : 'unverified'
+  getJdkVerificationIdentity: jest.fn(
+    (verified: boolean, enforced: boolean, key?: string) =>
+      verified
+        ? `${enforced ? 'enforced' : 'check-and-warn'}:${key ? 'custom' : 'bundled'}`
+        : 'disabled'
  ),
  registerJdk: jest.fn(),
  restoreJdk: jest.fn()
@@ -395,8 +398,10 @@ describe('setupJava', () => {

  beforeEach(() => {
    (jdkCache.getJdkVerificationIdentity as jest.Mock).mockImplementation(
-      (verified: boolean, key?: string) =>
-        verified ? (key ? 'verified:custom' : 'verified:bundled') : 'unverified'
+      (verified: boolean, enforced: boolean, key?: string) =>
+        verified
+          ? `${enforced ? 'enforced' : 'check-and-warn'}:${key ? 'custom' : 'bundled'}`
+          : 'disabled'
    );
    spyGetToolcachePath = util.getToolcachePath as jest.Mock;
    spyGetToolcachePath.mockImplementation(
@@ -826,7 +831,7 @@ describe('setupJava', () => {
    expect(jdkCache.registerJdk).toHaveBeenCalledWith(
      expect.objectContaining({
        version: actualJavaVersion,
-        verification: 'unverified'
+        verification: 'disabled'
      })
    );
  });
@@ -886,7 +891,7 @@ describe('setupJava', () => {
      architecture: 'x86',
      version: actualJavaVersion,
      source: `some/random_url/java/${actualJavaVersion}`,
-      verification: 'unverified',
+      verification: 'disabled',
      path: path.join(toolCachePath, 'Java_Empty_jdk', actualJavaVersion)
    });
    expect(downloadTool).not.toHaveBeenCalled();
@@ -919,7 +924,7 @@ describe('setupJava', () => {
      architecture: 'x86',
      version: actualJavaVersion,
      source: `some/random_url/java/${actualJavaVersion}`,
-      verification: 'unverified',
+      verification: 'disabled',
      path: path.join(toolCachePath, 'Java_Empty_jdk', actualJavaVersion)
    };
    expect(jdkCache.restoreJdk).toHaveBeenCalledWith(expectedIdentity);
@@ -78,6 +78,8 @@ function response(
 }

 describe('getAvailableVersions', () => {
+  jest.setTimeout(10_000);
+
  let spyHttpClient: any;
  let spyCoreError: any;
  const originalGitHubToken = process.env.GITHUB_TOKEN;
@@ -58,7 +58,7 @@ jest.unstable_mockModule('@actions/tool-cache', () => ({
 }));

 jest.unstable_mockModule('../../src/jdk-cache.js', () => ({
-  getJdkVerificationIdentity: jest.fn(() => 'unverified'),
+  getJdkVerificationIdentity: jest.fn(() => 'disabled'),
  registerJdk: jest.fn(),
  restoreJdk: jest.fn()
 }));
@@ -106,7 +106,7 @@ describe('setupJava', () => {

  beforeEach(() => {
    (jdkCache.getJdkVerificationIdentity as jest.Mock).mockReturnValue(
-      'unverified'
+      'disabled'
    );
    spyGetToolcachePath = util.getToolcachePath as jest.Mock;
    spyGetToolcachePath.mockImplementation(
@@ -283,7 +283,7 @@ describe('setupJava', () => {
          expect.objectContaining({
            distribution: 'jdkfile',
            version: actualJavaVersion,
-            verification: 'unverified'
+            verification: 'disabled'
          })
        );
      } finally {
@@ -398,13 +398,12 @@ describe('downloadTool', () => {
    jest.restoreAllMocks();
  });

-  it('verifies signature when enabled', async () => {
+  it('verifies signatures by default', async () => {
    const signedDistribution = new MicrosoftDistributions({
      version: '17',
      architecture: 'x64',
      packageType: 'jdk',
-      checkLatest: false,
-      verifySignature: true
+      checkLatest: false
    });

    await signedDistribution['downloadTool']({
@@ -445,6 +444,64 @@ describe('downloadTool', () => {
    );
  });

+  it('warns with key rotation recovery guidance when default verification fails', async () => {
+    spyVerifySignature.mockRejectedValue(new Error('bad signature'));
+    const signedDistribution = new MicrosoftDistributions({
+      version: '17',
+      architecture: 'x64',
+      packageType: 'jdk',
+      checkLatest: false
+    });
+
+    await signedDistribution['downloadTool']({
+      version: '17.0.14+7',
+      url: 'https://example.com/jdk.tar.gz',
+      signatureUrl: 'https://example.com/jdk.tar.gz.sig'
+    });
+
+    expect(core.warning).toHaveBeenCalledWith(
+      expect.stringMatching(
+        /bad signature.*https:\/\/github\.com\/actions\/setup-java#download-integrity-and-signatures/
+      )
+    );
+    expect(spyExtractJdkFile).toHaveBeenCalled();
+  });
+
+  it('fails with recovery guidance when verification is explicitly enabled', async () => {
+    spyVerifySignature.mockRejectedValue(new Error('bad signature'));
+    const signedDistribution = new MicrosoftDistributions({
+      version: '17',
+      architecture: 'x64',
+      packageType: 'jdk',
+      checkLatest: false,
+      verifySignature: true
+    });
+
+    await expect(
+      signedDistribution['downloadTool']({
+        version: '17.0.14+7',
+        url: 'https://example.com/jdk.tar.gz',
+        signatureUrl: 'https://example.com/jdk.tar.gz.sig'
+      })
+    ).rejects.toThrow(
+      /bad signature.*https:\/\/github\.com\/actions\/setup-java#download-integrity-and-signatures/
+    );
+    expect(spyExtractJdkFile).not.toHaveBeenCalled();
+  });
+
+  it('warns when the signature is missing during default verification', async () => {
+    await distribution['downloadTool']({
+      version: '17.0.14+7',
+      url: 'https://example.com/jdk.tar.gz'
+    });
+
+    expect(core.warning).toHaveBeenCalledWith(
+      "Input 'verify-signature' is enabled, but no signature URL was found for Microsoft Build of OpenJDK version 17.0.14+7."
+    );
+    expect(spyVerifySignature).not.toHaveBeenCalled();
+    expect(spyExtractJdkFile).toHaveBeenCalled();
+  });
+
  it('fails when signature is missing and verification is enabled', async () => {
    const signedDistribution = new MicrosoftDistributions({
      version: '17',
@@ -73,6 +73,7 @@ jest.unstable_mockModule('../../src/util.js', () => ({
 jest.unstable_mockModule('../../src/gpg.js', () => ({
  importKey: jest.fn(),
  removeGpgHome: jest.fn(),
+  isGpgAvailable: jest.fn(),
  verifyPackageSignature: jest.fn()
 }));

@@ -437,6 +438,7 @@ describe('downloadTool', () => {
  beforeEach(() => {
    spyDownloadTool = tc.downloadTool as jest.Mock;
    spyDownloadTool.mockResolvedValue('/tmp/jdk.tar.gz');
+    (gpg.isGpgAvailable as jest.Mock).mockResolvedValue(true);
    spyVerifySignature = gpg.verifyPackageSignature as jest.Mock;
    spyVerifySignature.mockResolvedValue(undefined);
    spyExtractJdkFile = util.extractJdkFile as jest.Mock;
@@ -457,14 +459,13 @@ describe('downloadTool', () => {
    jest.restoreAllMocks();
  });

-  it('verifies signature when enabled', async () => {
+  it('verifies signatures by default', async () => {
    const distribution = new TemurinDistribution(
      {
        version: '17',
        architecture: 'x64',
        packageType: 'jdk',
-        checkLatest: false,
-        verifySignature: true
+        checkLatest: false
      },
      TemurinImplementation.Hotspot
    );
@@ -482,6 +483,154 @@ describe('downloadTool', () => {
    );
  });

+  it('does not verify signatures when explicitly disabled', async () => {
+    const distribution = new TemurinDistribution(
+      {
+        version: '17',
+        architecture: 'x64',
+        packageType: 'jdk',
+        checkLatest: false,
+        verifySignature: false
+      },
+      TemurinImplementation.Hotspot
+    );
+
+    await distribution['downloadTool']({
+      version: '17.0.14+7',
+      url: 'https://example.com/jdk.tar.gz',
+      signatureUrl: 'https://example.com/jdk.tar.gz.sig'
+    });
+
+    expect(spyVerifySignature).not.toHaveBeenCalled();
+  });
+
+  it('skips implicit signature verification when gpg is unavailable', async () => {
+    (gpg.isGpgAvailable as jest.Mock).mockResolvedValue(false);
+    const distribution = new TemurinDistribution(
+      {
+        version: '17',
+        architecture: 'x64',
+        packageType: 'jdk',
+        checkLatest: false
+      },
+      TemurinImplementation.Hotspot
+    );
+
+    await expect(
+      distribution['downloadTool']({
+        version: '17.0.14+7',
+        url: 'https://example.com/jdk.tar.gz',
+        signatureUrl: 'https://example.com/jdk.tar.gz.sig'
+      })
+    ).resolves.toEqual({version: '17.0.14+7', path: '/tmp/toolcache'});
+
+    expect(spyVerifySignature).not.toHaveBeenCalled();
+    expect(core.warning).toHaveBeenCalledWith(
+      "Input 'verify-signature' is enabled, but gpg is not available."
+    );
+  });
+
+  it('fails when signature verification is explicitly enabled without gpg', async () => {
+    (gpg.isGpgAvailable as jest.Mock).mockResolvedValue(false);
+    const distribution = new TemurinDistribution(
+      {
+        version: '17',
+        architecture: 'x64',
+        packageType: 'jdk',
+        checkLatest: false,
+        verifySignature: true
+      },
+      TemurinImplementation.Hotspot
+    );
+
+    await expect(
+      distribution['downloadTool']({
+        version: '17.0.14+7',
+        url: 'https://example.com/jdk.tar.gz',
+        signatureUrl: 'https://example.com/jdk.tar.gz.sig'
+      })
+    ).rejects.toThrow(
+      "Input 'verify-signature' is enabled, but gpg is not available."
+    );
+
+    expect(spyVerifySignature).not.toHaveBeenCalled();
+  });
+
+  it('warns when implicit signature verification fails', async () => {
+    spyVerifySignature.mockRejectedValue(new Error('bad signature'));
+    const distribution = new TemurinDistribution(
+      {
+        version: '17',
+        architecture: 'x64',
+        packageType: 'jdk',
+        checkLatest: false
+      },
+      TemurinImplementation.Hotspot
+    );
+
+    await expect(
+      distribution['downloadTool']({
+        version: '17.0.14+7',
+        url: 'https://example.com/jdk.tar.gz',
+        signatureUrl: 'https://example.com/jdk.tar.gz.sig'
+      })
+    ).resolves.toEqual({version: '17.0.14+7', path: '/tmp/toolcache'});
+
+    expect(core.warning).toHaveBeenCalledWith(
+      expect.stringContaining(
+        'https://github.com/actions/setup-java#download-integrity-and-signatures'
+      )
+    );
+  });
+
+  it('fails when explicitly requested signature verification fails', async () => {
+    spyVerifySignature.mockRejectedValue(new Error('bad signature'));
+    const distribution = new TemurinDistribution(
+      {
+        version: '17',
+        architecture: 'x64',
+        packageType: 'jdk',
+        checkLatest: false,
+        verifySignature: true
+      },
+      TemurinImplementation.Hotspot
+    );
+
+    await expect(
+      distribution['downloadTool']({
+        version: '17.0.14+7',
+        url: 'https://example.com/jdk.tar.gz',
+        signatureUrl: 'https://example.com/jdk.tar.gz.sig'
+      })
+    ).rejects.toThrow(
+      /Failed to verify signature for Temurin version 17\.0\.14\+7.*bad signature.*https:\/\/github\.com\/actions\/setup-java#download-integrity-and-signatures/
+    );
+  });
+
+  it('warns when a signature is missing and verification is implicit', async () => {
+    const distribution = new TemurinDistribution(
+      {
+        version: '17',
+        architecture: 'x64',
+        packageType: 'jdk',
+        checkLatest: false
+      },
+      TemurinImplementation.Hotspot
+    );
+
+    await expect(
+      distribution['downloadTool']({
+        version: '17.0.14+7',
+        url: 'https://example.com/jdk.tar.gz'
+      })
+    ).resolves.toEqual({version: '17.0.14+7', path: '/tmp/toolcache'});
+
+    expect(core.warning).toHaveBeenCalledWith(
+      "Input 'verify-signature' is enabled, but no signature URL was found for Temurin version 17.0.14+7."
+    );
+    expect(spyVerifySignature).not.toHaveBeenCalled();
+  });
+
  it('downloads and adds matching JMODs to the JDK', async () => {
    spyDownloadTool
      .mockResolvedValueOnce('/tmp/jdk.tar.gz')
@@ -499,7 +648,8 @@ describe('downloadTool', () => {
        version: '25',
        architecture: 'x64',
        packageType: 'jdk+jmods',
-        checkLatest: false
+        checkLatest: false,
+        verifySignature: false
      },
      TemurinImplementation.Hotspot
    );
@@ -245,7 +245,7 @@ describe('gpg tests', () => {
          expect.any(String),
          '--batch',
          '--import',
-          expect.stringContaining('public-key.asc')
+          expect.stringContaining('public-key-0.asc')
        ],
        expect.objectContaining({silent: true})
      );
@@ -263,5 +263,32 @@ describe('gpg tests', () => {
        expect.objectContaining({silent: true})
      );
    });
+
+    it('imports multiple bundled keys before verifying the package', async () => {
+      (tc.downloadTool as jest.Mock<any>).mockResolvedValue(
+        '/tmp/jdk.tar.gz.sig'
+      );
+
+      await gpg.verifyPackageSignature(
+        '/tmp/jdk.tar.gz',
+        'https://example.com/jdk.tar.gz.sig',
+        ['public-key-a', 'public-key-b']
+      );
+
+      expect(exec.exec).toHaveBeenNthCalledWith(
+        1,
+        'gpg',
+        [
+          '--homedir',
+          expect.any(String),
+          '--batch',
+          '--import',
+          expect.stringContaining('public-key-0.asc'),
+          expect.stringContaining('public-key-1.asc')
+        ],
+        expect.objectContaining({silent: true})
+      );
+      expect(exec.exec).toHaveBeenCalledTimes(2);
+    });
  });
 });
@@ -43,7 +43,7 @@ const jdk = {
  architecture: 'x64',
  version: '21.0.8+9',
  source: 'sha256:abc123',
-  verification: 'unverified',
+  verification: 'disabled',
  path: '/toolcache/Java_temurin_jdk/21.0.8-9'
 };

@@ -117,32 +117,59 @@ describe('JDK cache', () => {
    );
  });

-  it('separates unverified, bundled-key, and custom-key caches', () => {
-    const unverified = getJdkVerificationIdentity(false);
-    const bundled = getJdkVerificationIdentity(true);
+  it('separates verification policies and keys', () => {
+    const disabled = getJdkVerificationIdentity(false, false);
+    const checkAndWarnBundled = getJdkVerificationIdentity(true, false);
+    const enforcedBundled = getJdkVerificationIdentity(true, true);
    const customA = getJdkVerificationIdentity(
+      true,
      true,
      '-----BEGIN PGP PUBLIC KEY BLOCK-----\r\nkey-a\r\n-----END PGP PUBLIC KEY BLOCK-----\r\n'
    );
    const customANormalized = getJdkVerificationIdentity(
+      true,
      true,
      '-----BEGIN PGP PUBLIC KEY BLOCK-----\nkey-a\n-----END PGP PUBLIC KEY BLOCK-----'
    );
-    const customB = getJdkVerificationIdentity(true, 'different-key');
-
-    expect(new Set([unverified, bundled, customA, customB])).toHaveProperty(
-      'size',
-      4
+    const customB = getJdkVerificationIdentity(true, true, 'different-key');
+    const checkAndWarnCustomA = getJdkVerificationIdentity(
+      true,
+      false,
+      '-----BEGIN PGP PUBLIC KEY BLOCK-----\nkey-a\n-----END PGP PUBLIC KEY BLOCK-----'
    );
+    const customList = getJdkVerificationIdentity(true, true, [
+      'key-a',
+      'key-b'
+    ]);
+    const customListWithDifferentBoundary = getJdkVerificationIdentity(
+      true,
+      true,
+      ['key-ak', 'ey-b']
+    );
+
+    expect(
+      new Set([
+        disabled,
+        checkAndWarnBundled,
+        enforcedBundled,
+        customA,
+        customB
+      ])
+    ).toHaveProperty('size', 5);
+    expect(disabled).toBe('disabled');
+    expect(checkAndWarnBundled).toBe('check-and-warn:bundled');
+    expect(enforcedBundled).toBe('enforced:bundled');
+    expect(checkAndWarnCustomA).not.toBe(customA);
    expect(customA).toBe(customANormalized);
    expect(customA).not.toContain('key-a');
+    expect(customList).not.toBe(customListWithDifferentBoundary);
    expect(
      new Set(
-        [unverified, bundled, customA, customB].map(verification =>
-          buildJdkCacheKey({...jdk, verification})
+        [disabled, checkAndWarnBundled, enforcedBundled, customA, customB].map(
+          verification => buildJdkCacheKey({...jdk, verification})
        )
      )
-    ).toHaveProperty('size', 4);
+    ).toHaveProperty('size', 5);
  });

  it('restores and records an exact JDK cache hit', async () => {
@@ -210,12 +237,12 @@ describe('JDK cache', () => {

  it('saves only the key matching the installation that occupies the path', async () => {
    const jdkPath = createInstallation();
-    const verified = {...jdk, path: jdkPath, verification: 'verified:bundled'};
-    const unverified = {...jdk, path: jdkPath};
+    const enforced = {...jdk, path: jdkPath, verification: 'enforced:bundled'};
+    const disabled = {...jdk, path: jdkPath};

-    registerJdk(verified);
+    registerJdk(enforced);
    writeInstallation(jdkPath, 'force-downloaded-without-verification');
-    registerJdk(unverified);
+    registerJdk(disabled);
    (core.getState as jest.Mock).mockReturnValue(lastState());
    (cache.saveCache as jest.Mock).mockResolvedValue(1);

@@ -223,11 +250,11 @@ describe('JDK cache', () => {

    expect(cache.saveCache).not.toHaveBeenCalledWith(
      [jdkPath],
-      buildJdkCacheKey(verified)
+      buildJdkCacheKey(enforced)
    );
    expect(cache.saveCache).toHaveBeenCalledWith(
      [jdkPath],
-      buildJdkCacheKey(unverified)
+      buildJdkCacheKey(disabled)
    );
  });

@@ -161,6 +161,37 @@ describe('setup action orchestration', () => {
    expect(factory.getJavaDistribution).not.toHaveBeenCalled();
  });

+  it.each([
+    ['temurin', undefined, undefined],
+    ['zulu', undefined, undefined],
+    ['temurin', false, false],
+    ['zulu', true, true]
+  ])(
+    'passes signature verification input for %s with explicit value %s as %s',
+    async (distribution, explicitValue, expectedValue) => {
+      inputs.set('distribution', distribution);
+      multilineInputs.set('java-version', ['21']);
+      if (explicitValue !== undefined) {
+        inputs.set('verify-signature', String(explicitValue));
+        booleanInputs.set('verify-signature', explicitValue);
+      }
+      (factory.getJavaDistribution as jest.Mock).mockReturnValue({
+        setupJava: jest.fn(async () => ({
+          version: '21.0.4+7',
+          path: '/opt/java/21'
+        }))
+      });
+
+      await run();
+
+      expect(factory.getJavaDistribution).toHaveBeenCalledWith(
+        distribution,
+        expect.objectContaining({verifySignature: expectedValue}),
+        ''
+      );
+    }
+  );
+
  it('requires distribution when it cannot be inferred from the version file', async () => {
    inputs.set('java-version-file', '.java-version');
    (fs.readFileSync as jest.Mock).mockReturnValue(Buffer.from('21'));
@@ -200,7 +231,6 @@ describe('setup action orchestration', () => {
    booleanInputs.set('check-latest', true);
    booleanInputs.set('force-download', true);
    booleanInputs.set('set-default', false);
-    booleanInputs.set('verify-signature', true);
    inputs.set('verify-signature-public-key', 'public-key');
    (fs.readFileSync as jest.Mock).mockReturnValue(
      Buffer.from('java=21.0.5-tem')
@@ -232,7 +262,7 @@ describe('setup action orchestration', () => {
        forceDownload: true,
        cacheJdk: false,
        setDefault: false,
-        verifySignature: true,
+        verifySignature: undefined,
        verifySignaturePublicKey: 'public-key'
      },
      '/tmp/java.tar.gz'
@@ -39,11 +39,10 @@ inputs:
    required: false
    default: true
  verify-signature:
-    description: 'Verify downloaded Java package signatures when supported by the selected distribution'
+    description: 'Check downloaded Java package signatures when supported by the selected distribution. When omitted, failures produce warnings. Explicitly setting this to true enforces verification and makes failures fatal, including failures caused by an unexpected vendor signing-key rotation.'
    required: false
-    default: false
  verify-signature-public-key:
-    description: 'ASCII-armored GPG public key used to verify the downloaded package signature. Overrides the default bundled key for the selected distribution.'
+    description: 'One or more ASCII-armored GPG public keys used to verify downloaded package signatures. Concatenate multiple armored key blocks. Custom keys replace the bundled keys for the selected distribution.'
    required: false
  server-id:
    description: 'ID of the distributionManagement repository in the pom.xml
@@ -122,16 +122,25 @@ function getInstallationIdentity(jdkPath, architecture) {
        return undefined;
    }
 }
-function getJdkVerificationIdentity(verifySignature, publicKey) {
+function getJdkVerificationIdentity(verifySignature, enforceSignatureVerification, publicKey) {
    if (!verifySignature) {
-        return 'unverified';
+        return 'disabled';
    }
+    const verificationPolicy = enforceSignatureVerification
+        ? 'enforced'
+        : 'check-and-warn';
    if (!publicKey) {
-        return 'verified:bundled';
+        return `${verificationPolicy}:bundled`;
    }
-    const normalizedKey = publicKey.replace(/\r\n?/g, '\n').trim();
-    const fingerprint = createHash('sha256').update(normalizedKey).digest('hex');
-    return `verified:custom:sha256:${fingerprint}`;
+    const publicKeys = Array.isArray(publicKey) ? publicKey : [publicKey];
+    const normalizedKeys = publicKeys.map(key => key.replace(/\r\n?/g, '\n').trim());
+    const fingerprintSource = Array.isArray(publicKey)
+        ? normalizedKeys.map(key => `${Buffer.byteLength(key)}:${key}`).join('')
+        : normalizedKeys[0];
+    const fingerprint = createHash('sha256')
+        .update(fingerprintSource)
+        .digest('hex');
+    return `${verificationPolicy}:custom:sha256:${fingerprint}`;
 }
 async function saveJdkCaches() {
    const state = lib_core/* getState */.Gu(STATE_JDK_CACHES);
@@ -18680,12 +18680,26 @@ class XmlNode {
      this.child.push({ [node.tagname]: node.child });
    }
    // if requested, add the startIndex
+    this.addStartIndex(startIndex);
+  }
+
+  addStartIndex(startIndex) {
    if (startIndex !== undefined) {
      // Note: for now we just overwrite the metadata. If we had more complex metadata,
      // we might need to do an object append here:  metadata = { ...metadata, startIndex }
      this.child[this.child.length - 1][METADATA_SYMBOL] = { startIndex };
    }
  }
+
+  addEndIndex(endIndex) {
+    const lastChild = this.child[this.child.length - 1];
+    // endIndex is write-once: when updateTag drops a node, the last child is a
+    // previously completed sibling whose endIndex must not be overwritten
+    if (lastChild !== undefined && lastChild[METADATA_SYMBOL] !== undefined
+      && lastChild[METADATA_SYMBOL].endIndex === undefined) {
+      lastChild[METADATA_SYMBOL].endIndex = endIndex;
+    }
+  }
  /** symbol used for metadata */
  static getMetaDataSymbol() {
    return METADATA_SYMBOL;
@@ -18718,8 +18732,23 @@ class DocTypeReader {
            i = i + 9;
            let angleBracketsCount = 1;
            let hasBody = false, comment = false;
+            let quoteChar = null; // tracks an open SYSTEM/PUBLIC literal before the '[' body
            let exp = "";
            for (; i < xmlData.length; i++) {
+                // Inside a quoted external-identifier literal — XML allows '<'
+                // and '>' as plain data here, so they must not be interpreted
+                // as DOCTYPE structure until the matching quote closes.
+                if (quoteChar !== null) {
+                    if (xmlData[i] === quoteChar) quoteChar = null;
+                    exp += xmlData[i];
+                    continue;
+                }
+                if (!hasBody && !comment && (xmlData[i] === '"' || xmlData[i] === "'")) {
+                    quoteChar = xmlData[i];
+                    exp += xmlData[i];
+                    continue;
+                }
+
                if (xmlData[i] === '<' && !comment) { //Determine the tag type
                    if (hasBody && hasSeq(xmlData, "!ENTITY", i)) {
                        i += 7;
@@ -18774,7 +18803,7 @@ class DocTypeReader {
                    exp += xmlData[i];
                }
            }
-            if (angleBracketsCount !== 0) {
+            if (quoteChar !== null || angleBracketsCount !== 0) {
                throw new Error(`Unclosed DOCTYPE`);
            }
        } else {
@@ -19489,7 +19518,11 @@ function resolveEnotation(str, trimmedStr, options) {
 */
 function trimZeros(numStr) {
    if (numStr && numStr.indexOf(".") !== -1) {//float
-        numStr = numStr.replace(/0+$/, ""); //remove ending zeros
+        //remove ending zeros without the O(n^2) backtracking that /0+$/ hits
+        //when the string doesn't end in 0 but has a long internal zero-run
+        let end = numStr.length;
+        while (end > 0 && numStr.charCodeAt(end - 1) === 48 /* '0' */) end--;
+        numStr = numStr.slice(0, end);
        if (numStr === ".") numStr = "0";
        else if (numStr[0] === ".") numStr = "0" + numStr;
        else if (numStr[numStr.length - 1] === ".") numStr = numStr.substring(0, numStr.length - 1);
@@ -22965,7 +22998,12 @@ const parseXml = function (xmlData) {
        this.matcher.pop();
        this.isCurrentNodeStopNode = false; // Reset flag when closing tag

-        currentNode = this.tagsNodeStack.pop();//avoid recursion, set the parent tag scope
+        //a closing tag with no matching opening tag leaves the stack empty
+        currentNode = this.tagsNodeStack.pop() || xmlObj;//avoid recursion, set the parent tag scope
+
+        if (options.captureMetaData && currentNode) {
+          currentNode.addEndIndex(closeIndex + 1);
+        }
        textData = "";
        i = closeIndex;
      } else if (c1 === 63) { //'?'
@@ -22991,6 +23029,11 @@ const parseXml = function (xmlData) {
            childNode[":@"] = attsMap
          }
          this.addChild(currentNode, childNode, this.readonlyMatcher, i);
+
+          if (options.captureMetaData) {
+            // closeIndex points at '?' of the closing '?>'
+            currentNode.addEndIndex(tagData.closeIndex + 2);
+          }
        }


@@ -23155,6 +23198,10 @@ const parseXml = function (xmlData) {
          this.isCurrentNodeStopNode = false; // Reset flag

          this.addChild(currentNode, childNode, this.readonlyMatcher, startIndex);
+
+          if (options.captureMetaData) {
+            currentNode.addEndIndex(i + 1);
+          }
        } else {
          //selfClosing tag
          if (isSelfClosing) {
@@ -23165,6 +23212,10 @@ const parseXml = function (xmlData) {
              childNode[":@"] = prefixedAttrs;
            }
            this.addChild(currentNode, childNode, this.readonlyMatcher, startIndex);
+
+            if (options.captureMetaData) {
+              currentNode.addEndIndex(closeIndex + 1);
+            }
            this.matcher.pop(); // Pop self-closing tag
            this.isCurrentNodeStopNode = false; // Reset flag
          }
@@ -23174,6 +23225,10 @@ const parseXml = function (xmlData) {
              childNode[":@"] = prefixedAttrs;
            }
            this.addChild(currentNode, childNode, this.readonlyMatcher, startIndex);
+
+            if (options.captureMetaData) {
+              currentNode.addEndIndex(result.closeIndex + 1);
+            }
            this.matcher.pop(); // Pop unpaired tag
            this.isCurrentNodeStopNode = false; // Reset flag
            i = result.closeIndex;
@@ -30774,7 +30774,7 @@ module.exports = {
 /* harmony export */   gk: () => (/* binding */ INPUT_CACHE),
 /* harmony export */   wG: () => (/* binding */ INPUT_JOB_STATUS)
 /* harmony export */ });
-/* unused harmony exports MACOS_JAVA_CONTENT_POSTFIX, INPUT_JAVA_VERSION, INPUT_JAVA_VERSION_FILE, INPUT_ARCHITECTURE, INPUT_JAVA_PACKAGE, INPUT_DISTRIBUTION, INPUT_JDK_FILE, INPUT_JDK_FILE_DEPRECATED, INPUT_CHECK_LATEST, INPUT_FORCE_DOWNLOAD, INPUT_SET_DEFAULT, INPUT_PROBLEM_MATCHER, INPUT_VERIFY_SIGNATURE, INPUT_VERIFY_SIGNATURE_PUBLIC_KEY, INPUT_MVN_SERVER_CREDENTIALS, INPUT_MVN_REPOSITORIES, INPUT_MVN_REPOSITORIES_INCLUDE_CENTRAL, INPUT_MVN_REPOSITORIES_PRIORITIZE_CENTRAL, INPUT_SERVER_ID, INPUT_SERVER_USERNAME_ENV_VAR, INPUT_SERVER_PASSWORD_ENV_VAR, INPUT_SERVER_USERNAME_DEPRECATED, INPUT_SERVER_PASSWORD_DEPRECATED, INPUT_SETTINGS_PATH, INPUT_OVERWRITE_SETTINGS, INPUT_GPG_PRIVATE_KEY, INPUT_GPG_PASSPHRASE_ENV_VAR, INPUT_GPG_PASSPHRASE_DEPRECATED, INPUT_DEFAULT_SERVER_USERNAME, INPUT_DEFAULT_SERVER_PASSWORD, INPUT_DEFAULT_GPG_PRIVATE_KEY, INPUT_DEFAULT_GPG_PASSPHRASE, MAVEN_GPG_PASSPHRASE_DEFAULT_ENV, GPG_PASSPHRASE_PROFILE_ID, MAVEN_REPOSITORIES_PROFILE_ID, MAVEN_CENTRAL_REPOSITORY_ID, MAVEN_CENTRAL_REPOSITORY_URL, INPUT_CACHE_DEPENDENCY_PATH, INPUT_CACHE_PATH, M2_DIR, MVN_SETTINGS_FILE, MVN_TOOLCHAINS_FILE, INPUT_MVN_TOOLCHAIN_ID, INPUT_MVN_TOOLCHAIN_VENDOR, INPUT_SHOW_DOWNLOAD_PROGRESS, MAVEN_ARGS_ENV, MAVEN_NO_TRANSFER_PROGRESS_FLAG, MAVEN_NO_TRANSFER_PROGRESS_LONG_FLAG, DISTRIBUTIONS_ONLY_MAJOR_VERSION */
+/* unused harmony exports MACOS_JAVA_CONTENT_POSTFIX, INPUT_JAVA_VERSION, INPUT_JAVA_VERSION_FILE, INPUT_ARCHITECTURE, INPUT_JAVA_PACKAGE, INPUT_DISTRIBUTION, INPUT_JDK_FILE, INPUT_JDK_FILE_DEPRECATED, INPUT_CHECK_LATEST, INPUT_FORCE_DOWNLOAD, INPUT_SET_DEFAULT, INPUT_PROBLEM_MATCHER, INPUT_VERIFY_SIGNATURE, INPUT_VERIFY_SIGNATURE_PUBLIC_KEY, SIGNATURE_VERIFICATION_DOCUMENTATION_URL, SIGNATURE_VERIFICATION_FAILURE_HELP, INPUT_MVN_SERVER_CREDENTIALS, INPUT_MVN_REPOSITORIES, INPUT_MVN_REPOSITORIES_INCLUDE_CENTRAL, INPUT_MVN_REPOSITORIES_PRIORITIZE_CENTRAL, INPUT_SERVER_ID, INPUT_SERVER_USERNAME_ENV_VAR, INPUT_SERVER_PASSWORD_ENV_VAR, INPUT_SERVER_USERNAME_DEPRECATED, INPUT_SERVER_PASSWORD_DEPRECATED, INPUT_SETTINGS_PATH, INPUT_OVERWRITE_SETTINGS, INPUT_GPG_PRIVATE_KEY, INPUT_GPG_PASSPHRASE_ENV_VAR, INPUT_GPG_PASSPHRASE_DEPRECATED, INPUT_DEFAULT_SERVER_USERNAME, INPUT_DEFAULT_SERVER_PASSWORD, INPUT_DEFAULT_GPG_PRIVATE_KEY, INPUT_DEFAULT_GPG_PASSPHRASE, MAVEN_GPG_PASSPHRASE_DEFAULT_ENV, GPG_PASSPHRASE_PROFILE_ID, MAVEN_REPOSITORIES_PROFILE_ID, MAVEN_CENTRAL_REPOSITORY_ID, MAVEN_CENTRAL_REPOSITORY_URL, INPUT_CACHE_DEPENDENCY_PATH, INPUT_CACHE_PATH, M2_DIR, MVN_SETTINGS_FILE, MVN_TOOLCHAINS_FILE, INPUT_MVN_TOOLCHAIN_ID, INPUT_MVN_TOOLCHAIN_VENDOR, INPUT_SHOW_DOWNLOAD_PROGRESS, MAVEN_ARGS_ENV, MAVEN_NO_TRANSFER_PROGRESS_FLAG, MAVEN_NO_TRANSFER_PROGRESS_LONG_FLAG, DISTRIBUTIONS_ONLY_MAJOR_VERSION */
 const MACOS_JAVA_CONTENT_POSTFIX = 'Contents/Home';
 const INPUT_JAVA_VERSION = 'java-version';
 const INPUT_JAVA_VERSION_FILE = 'java-version-file';
@@ -30789,6 +30789,8 @@ const INPUT_SET_DEFAULT = 'set-default';
 const INPUT_PROBLEM_MATCHER = 'problem-matcher';
 const INPUT_VERIFY_SIGNATURE = 'verify-signature';
 const INPUT_VERIFY_SIGNATURE_PUBLIC_KEY = 'verify-signature-public-key';
+const SIGNATURE_VERIFICATION_DOCUMENTATION_URL = 'https://github.com/actions/setup-java#download-integrity-and-signatures';
+const SIGNATURE_VERIFICATION_FAILURE_HELP = (/* unused pure expression or super */ null && (`If this is a legitimate vendor signing-key rotation, see ${SIGNATURE_VERIFICATION_DOCUMENTATION_URL} for instructions to configure the updated public key or temporarily disable signature verification.`));
 const INPUT_MVN_SERVER_CREDENTIALS = 'mvn-server-credentials';
 const INPUT_MVN_REPOSITORIES = 'mvn-repositories';
 const INPUT_MVN_REPOSITORIES_INCLUDE_CENTRAL = 'mvn-repositories-include-central';
@@ -35575,6 +35577,9 @@ function _unique(values) {
 /******/ __nccwpck_require__.m = __webpack_modules__;
 /******/ 
 /************************************************************************/
+/******/ /* webpack/runtime/asset-relocator-loader */
+/******/ if (typeof __nccwpck_require__ !== 'undefined') __nccwpck_require__.ab = decodeURIComponent(new URL('.', import.meta.url).pathname).slice(import.meta.url.match(/^file:\/\/\/\w:/) ? 1 : 0, -1) + "/";
+/******/ 
 /******/ /* webpack/runtime/compat get default export */
 /******/ (() => {
 /******/ 	// getDefaultExport function for compatibility with non-harmony modules
@@ -35667,10 +35672,6 @@ function _unique(values) {
 /******/ 	};
 /******/ })();
 /******/ 
-/******/ /* webpack/runtime/compat */
-/******/ 
-/******/ if (typeof __nccwpck_require__ !== 'undefined') __nccwpck_require__.ab = new URL('.', import.meta.url).pathname.slice(import.meta.url.match(/^file:\/\/\/\w:/) ? 1 : 0, -1) + "/";
-/******/ 
 /******/ /* webpack/runtime/import chunk loading */
 /******/ (() => {
 /******/ 	// no baseURI
@@ -35768,6 +35769,9 @@ var src_util = __nccwpck_require__(4527);

 const GPG_HOME_PREFIX = 'setup-java-gpg-';
 const VERIFY_GPG_HOME_PREFIX = 'verify-signature-gpg-home-';
+async function isGpgAvailable() {
+    return Boolean(await io.which('gpg', false));
+}
 // Convert a Windows path (D:\a\_temp\...) to a POSIX path (/d/a/_temp/...).
 // The Git-bundled GPG on Windows (MSYS2-based) uses POSIX path conventions
 // internally. Passing Windows paths with backslashes can cause fatal GPG errors
@@ -35851,15 +35855,21 @@ async function verifyPackageSignature(archivePath, signatureUrl, publicKeyConten
        throw new Error(`Failed to create temporary GPG home directory for signature verification: ${error.message}`, { cause: error });
    }
    try {
-        const publicKeyFile = path.join(gpgHome, 'public-key.asc');
-        fs.writeFileSync(publicKeyFile, publicKeyContent, { encoding: 'utf-8' });
+        const publicKeys = Array.isArray(publicKeyContent)
+            ? publicKeyContent
+            : [publicKeyContent];
+        const publicKeyFiles = publicKeys.map((publicKey, index) => {
+            const publicKeyFile = path.join(gpgHome, `public-key-${index}.asc`);
+            fs.writeFileSync(publicKeyFile, publicKey, { encoding: 'utf-8' });
+            return toGpgPath(publicKeyFile);
+        });
        const options = { silent: true };
        await exec.exec('gpg', [
            '--homedir',
            toGpgPath(gpgHome),
            '--batch',
            '--import',
-            toGpgPath(publicKeyFile)
+            ...publicKeyFiles
        ], options);
        await exec.exec('gpg', [
            '--homedir',
@@ -65,7 +65,7 @@ class LocalDistribution extends _base_installer_js__WEBPACK_IMPORTED_MODULE_3__/
                    architecture: this.architecture,
                    version: this.version,
                    source,
-                    verification: getJdkVerificationIdentity(false),
+                    verification: getJdkVerificationIdentity(false, false),
                    path: this.getJdkCachePath(this.version)
                };
            }
@@ -42,6 +42,8 @@ Fa133tP85xzJEq1XeXm8WeLFo2wV
 =rHCS
 -----END PGP PUBLIC KEY BLOCK-----`;

+// EXTERNAL MODULE: ./src/constants.ts
+var constants = __webpack_require__(7242);
 // EXTERNAL MODULE: ./node_modules/@actions/core/lib/core.js + 7 modules
 var core = __webpack_require__(3838);
 // EXTERNAL MODULE: ./node_modules/@actions/tool-cache/lib/tool-cache.js + 2 modules
@@ -62,6 +64,7 @@ var external_path_default = /*#__PURE__*/__webpack_require__.n(external_path_);



+
 class MicrosoftDistributions extends base_installer/* JavaBase */.O {
    constructor(installerOptions) {
        super('Microsoft', installerOptions);
@@ -70,15 +73,23 @@ class MicrosoftDistributions extends base_installer/* JavaBase */.O {
        core/* info */.pq(`Downloading Java ${javaRelease.version} (${this.distribution}) from ${javaRelease.url} ...`);
        let javaArchivePath = await this.downloadAndVerify(javaRelease);
        if (this.verifySignature) {
-            if (!javaRelease.signatureUrl) {
-                throw new Error(`Input 'verify-signature' is enabled, but no signature URL was found for Microsoft Build of OpenJDK version ${javaRelease.version}.`);
-            }
-            core/* info */.pq(`Verifying Java package signature...`);
            try {
-                await gpg/* verifyPackageSignature */.Yi(javaArchivePath, javaRelease.signatureUrl, this.verifySignaturePublicKey ?? MICROSOFT_PUBLIC_KEY);
+                if (!javaRelease.signatureUrl) {
+                    throw new Error(`Input 'verify-signature' is enabled, but no signature URL was found for Microsoft Build of OpenJDK version ${javaRelease.version}.`);
+                }
+                core/* info */.pq(`Verifying Java package signature...`);
+                try {
+                    await gpg/* verifyPackageSignature */.Yi(javaArchivePath, javaRelease.signatureUrl, this.verifySignaturePublicKey ?? MICROSOFT_PUBLIC_KEY);
+                }
+                catch (error) {
+                    throw new Error(`Failed to verify signature for Microsoft Build of OpenJDK version ${javaRelease.version}. Signature URL: ${javaRelease.signatureUrl}. Error: ${error.message} ${constants/* SIGNATURE_VERIFICATION_FAILURE_HELP */.kQ}`, { cause: error });
+                }
            }
            catch (error) {
-                throw new Error(`Failed to verify signature for Microsoft Build of OpenJDK version ${javaRelease.version}. Signature URL: ${javaRelease.signatureUrl}. Error: ${error.message}`, { cause: error });
+                if (this.verifySignatureExplicitlyRequested) {
+                    throw error;
+                }
+                core/* warning */.$e(error instanceof Error ? error.message : `Unknown error: ${error}`);
            }
        }
        core/* info */.pq(`Extracting Java archive...`);
@@ -167,7 +178,8 @@ class MicrosoftDistributions extends base_installer/* JavaBase */.O {
 /* harmony export */   Fh: () => (/* binding */ importKey),
 /* harmony export */   Yi: () => (/* binding */ verifyPackageSignature),
 /* harmony export */   mS: () => (/* binding */ removeGpgHome),
-/* harmony export */   nY: () => (/* binding */ toGpgPath)
+/* harmony export */   nY: () => (/* binding */ toGpgPath),
+/* harmony export */   o6: () => (/* binding */ isGpgAvailable)
 /* harmony export */ });
 /* unused harmony export GPG_HOME_PREFIX */
 /* harmony import */ var fs__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(9896);
@@ -189,6 +201,9 @@ class MicrosoftDistributions extends base_installer/* JavaBase */.O {

 const GPG_HOME_PREFIX = 'setup-java-gpg-';
 const VERIFY_GPG_HOME_PREFIX = 'verify-signature-gpg-home-';
+async function isGpgAvailable() {
+    return Boolean(await _actions_io__WEBPACK_IMPORTED_MODULE_3__/* .which */ .K7('gpg', false));
+}
 // Convert a Windows path (D:\a\_temp\...) to a POSIX path (/d/a/_temp/...).
 // The Git-bundled GPG on Windows (MSYS2-based) uses POSIX path conventions
 // internally. Passing Windows paths with backslashes can cause fatal GPG errors
@@ -272,15 +287,21 @@ async function verifyPackageSignature(archivePath, signatureUrl, publicKeyConten
        throw new Error(`Failed to create temporary GPG home directory for signature verification: ${error.message}`, { cause: error });
    }
    try {
-        const publicKeyFile = path__WEBPACK_IMPORTED_MODULE_1__.join(gpgHome, 'public-key.asc');
-        fs__WEBPACK_IMPORTED_MODULE_0__.writeFileSync(publicKeyFile, publicKeyContent, { encoding: 'utf-8' });
+        const publicKeys = Array.isArray(publicKeyContent)
+            ? publicKeyContent
+            : [publicKeyContent];
+        const publicKeyFiles = publicKeys.map((publicKey, index) => {
+            const publicKeyFile = path__WEBPACK_IMPORTED_MODULE_1__.join(gpgHome, `public-key-${index}.asc`);
+            fs__WEBPACK_IMPORTED_MODULE_0__.writeFileSync(publicKeyFile, publicKey, { encoding: 'utf-8' });
+            return toGpgPath(publicKeyFile);
+        });
        const options = { silent: true };
        await _actions_exec__WEBPACK_IMPORTED_MODULE_4__/* .exec */ .m('gpg', [
            '--homedir',
            toGpgPath(gpgHome),
            '--batch',
            '--import',
-            toGpgPath(publicKeyFile)
+            ...publicKeyFiles
        ], options);
        await _actions_exec__WEBPACK_IMPORTED_MODULE_4__/* .exec */ .m('gpg', [
            '--homedir',
@@ -226,6 +226,7 @@ class JavaBase {
    floatingVersionVerified = false;
    setDefault;
    verifySignature;
+    verifySignatureExplicitlyRequested;
    verifySignaturePublicKey;
    constructor(distribution, installerOptions) {
        this.distribution = distribution;
@@ -244,7 +245,10 @@ class JavaBase {
            installerOptions.setDefault !== undefined
                ? installerOptions.setDefault
                : true;
-        this.verifySignature = installerOptions.verifySignature ?? false;
+        this.verifySignature =
+            installerOptions.verifySignature ?? this.supportsSignatureVerification();
+        this.verifySignatureExplicitlyRequested =
+            installerOptions.verifySignature === true;
        this.verifySignaturePublicKey = installerOptions.verifySignaturePublicKey;
    }
    async downloadAndVerify(javaRelease) {
@@ -480,7 +484,7 @@ class JavaBase {
            architecture: this.architecture,
            version: javaRelease.version,
            source: this.getJdkReleaseIdentity(javaRelease),
-            verification: getJdkVerificationIdentity(this.verifySignature, this.verifySignaturePublicKey),
+            verification: getJdkVerificationIdentity(this.verifySignature, this.verifySignatureExplicitlyRequested, this.verifySignaturePublicKey),
            path: this.getJdkCachePath(javaRelease.version)
        };
    }
@@ -159,15 +159,32 @@ class TemurinDistribution extends base_installer/* JavaBase */.O {
    async downloadPackage(release) {
        const archivePath = await this.downloadAndVerify(release);
        if (this.verifySignature) {
-            if (!release.signatureUrl) {
-                throw new Error(`Input 'verify-signature' is enabled, but no signature URL was found for Temurin version ${release.version}.`);
-            }
-            core/* info */.pq(`Verifying Java package signature...`);
            try {
-                await gpg/* verifyPackageSignature */.Yi(archivePath, release.signatureUrl, this.verifySignaturePublicKey ?? ADOPTIUM_PUBLIC_KEY);
+                if (!(await gpg/* isGpgAvailable */.o6())) {
+                    throw new Error("Input 'verify-signature' is enabled, but gpg is not available.");
+                }
+                if (!release.signatureUrl) {
+                    throw new Error(`Input 'verify-signature' is enabled, but no signature URL was found for Temurin version ${release.version}.`);
+                }
+                core/* info */.pq(`Verifying Java package signature...`);
+                try {
+                    await gpg/* verifyPackageSignature */.Yi(archivePath, release.signatureUrl, this.verifySignaturePublicKey ?? ADOPTIUM_PUBLIC_KEY);
+                }
+                catch (error) {
+                    const verificationError = new Error(`Failed to verify signature for Temurin version ${release.version} from ${release.signatureUrl}: ${error.message} ${constants/* SIGNATURE_VERIFICATION_FAILURE_HELP */.kQ}`, { cause: error });
+                    if (this.verifySignatureExplicitlyRequested) {
+                        throw verificationError;
+                    }
+                    else {
+                        core/* warning */.$e(verificationError.message);
+                    }
+                }
            }
            catch (error) {
-                throw new Error(`Failed to verify signature for Temurin version ${release.version} from ${release.signatureUrl}: ${error.message}`, { cause: error });
+                if (this.verifySignatureExplicitlyRequested) {
+                    throw error;
+                }
+                core/* warning */.$e(error instanceof Error ? error.message : `Unknown error: ${error}`);
            }
        }
        return archivePath;
@@ -273,7 +290,8 @@ class TemurinDistribution extends base_installer/* JavaBase */.O {
 /* harmony export */   Fh: () => (/* binding */ importKey),
 /* harmony export */   Yi: () => (/* binding */ verifyPackageSignature),
 /* harmony export */   mS: () => (/* binding */ removeGpgHome),
-/* harmony export */   nY: () => (/* binding */ toGpgPath)
+/* harmony export */   nY: () => (/* binding */ toGpgPath),
+/* harmony export */   o6: () => (/* binding */ isGpgAvailable)
 /* harmony export */ });
 /* unused harmony export GPG_HOME_PREFIX */
 /* harmony import */ var fs__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(9896);
@@ -295,6 +313,9 @@ class TemurinDistribution extends base_installer/* JavaBase */.O {

 const GPG_HOME_PREFIX = 'setup-java-gpg-';
 const VERIFY_GPG_HOME_PREFIX = 'verify-signature-gpg-home-';
+async function isGpgAvailable() {
+    return Boolean(await _actions_io__WEBPACK_IMPORTED_MODULE_3__/* .which */ .K7('gpg', false));
+}
 // Convert a Windows path (D:\a\_temp\...) to a POSIX path (/d/a/_temp/...).
 // The Git-bundled GPG on Windows (MSYS2-based) uses POSIX path conventions
 // internally. Passing Windows paths with backslashes can cause fatal GPG errors
@@ -378,15 +399,21 @@ async function verifyPackageSignature(archivePath, signatureUrl, publicKeyConten
        throw new Error(`Failed to create temporary GPG home directory for signature verification: ${error.message}`, { cause: error });
    }
    try {
-        const publicKeyFile = path__WEBPACK_IMPORTED_MODULE_1__.join(gpgHome, 'public-key.asc');
-        fs__WEBPACK_IMPORTED_MODULE_0__.writeFileSync(publicKeyFile, publicKeyContent, { encoding: 'utf-8' });
+        const publicKeys = Array.isArray(publicKeyContent)
+            ? publicKeyContent
+            : [publicKeyContent];
+        const publicKeyFiles = publicKeys.map((publicKey, index) => {
+            const publicKeyFile = path__WEBPACK_IMPORTED_MODULE_1__.join(gpgHome, `public-key-${index}.asc`);
+            fs__WEBPACK_IMPORTED_MODULE_0__.writeFileSync(publicKeyFile, publicKey, { encoding: 'utf-8' });
+            return toGpgPath(publicKeyFile);
+        });
        const options = { silent: true };
        await _actions_exec__WEBPACK_IMPORTED_MODULE_4__/* .exec */ .m('gpg', [
            '--homedir',
            toGpgPath(gpgHome),
            '--batch',
            '--import',
-            toGpgPath(publicKeyFile)
+            ...publicKeyFiles
        ], options);
        await _actions_exec__WEBPACK_IMPORTED_MODULE_4__/* .exec */ .m('gpg', [
            '--homedir',
@@ -127,16 +127,25 @@ function getInstallationIdentity(jdkPath, architecture) {
        return undefined;
    }
 }
-function getJdkVerificationIdentity(verifySignature, publicKey) {
+function getJdkVerificationIdentity(verifySignature, enforceSignatureVerification, publicKey) {
    if (!verifySignature) {
-        return 'unverified';
+        return 'disabled';
    }
+    const verificationPolicy = enforceSignatureVerification
+        ? 'enforced'
+        : 'check-and-warn';
    if (!publicKey) {
-        return 'verified:bundled';
+        return `${verificationPolicy}:bundled`;
    }
-    const normalizedKey = publicKey.replace(/\r\n?/g, '\n').trim();
-    const fingerprint = (0,crypto__WEBPACK_IMPORTED_MODULE_0__.createHash)('sha256').update(normalizedKey).digest('hex');
-    return `verified:custom:sha256:${fingerprint}`;
+    const publicKeys = Array.isArray(publicKey) ? publicKey : [publicKey];
+    const normalizedKeys = publicKeys.map(key => key.replace(/\r\n?/g, '\n').trim());
+    const fingerprintSource = Array.isArray(publicKey)
+        ? normalizedKeys.map(key => `${Buffer.byteLength(key)}:${key}`).join('')
+        : normalizedKeys[0];
+    const fingerprint = (0,crypto__WEBPACK_IMPORTED_MODULE_0__.createHash)('sha256')
+        .update(fingerprintSource)
+        .digest('hex');
+    return `${verificationPolicy}:custom:sha256:${fingerprint}`;
 }
 async function saveJdkCaches() {
    const state = _actions_core__WEBPACK_IMPORTED_MODULE_4__/* .getState */ .Gu(STATE_JDK_CACHES);
@@ -265,7 +265,8 @@ async function write(directory, settings, overwriteSettings) {
 /* harmony export */   Fh: () => (/* binding */ importKey),
 /* harmony export */   Yi: () => (/* binding */ verifyPackageSignature),
 /* harmony export */   mS: () => (/* binding */ removeGpgHome),
-/* harmony export */   nY: () => (/* binding */ toGpgPath)
+/* harmony export */   nY: () => (/* binding */ toGpgPath),
+/* harmony export */   o6: () => (/* binding */ isGpgAvailable)
 /* harmony export */ });
 /* unused harmony export GPG_HOME_PREFIX */
 /* harmony import */ var fs__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(9896);
@@ -287,6 +288,9 @@ async function write(directory, settings, overwriteSettings) {

 const GPG_HOME_PREFIX = 'setup-java-gpg-';
 const VERIFY_GPG_HOME_PREFIX = 'verify-signature-gpg-home-';
+async function isGpgAvailable() {
+    return Boolean(await _actions_io__WEBPACK_IMPORTED_MODULE_3__/* .which */ .K7('gpg', false));
+}
 // Convert a Windows path (D:\a\_temp\...) to a POSIX path (/d/a/_temp/...).
 // The Git-bundled GPG on Windows (MSYS2-based) uses POSIX path conventions
 // internally. Passing Windows paths with backslashes can cause fatal GPG errors
@@ -370,15 +374,21 @@ async function verifyPackageSignature(archivePath, signatureUrl, publicKeyConten
        throw new Error(`Failed to create temporary GPG home directory for signature verification: ${error.message}`, { cause: error });
    }
    try {
-        const publicKeyFile = path__WEBPACK_IMPORTED_MODULE_1__.join(gpgHome, 'public-key.asc');
-        fs__WEBPACK_IMPORTED_MODULE_0__.writeFileSync(publicKeyFile, publicKeyContent, { encoding: 'utf-8' });
+        const publicKeys = Array.isArray(publicKeyContent)
+            ? publicKeyContent
+            : [publicKeyContent];
+        const publicKeyFiles = publicKeys.map((publicKey, index) => {
+            const publicKeyFile = path__WEBPACK_IMPORTED_MODULE_1__.join(gpgHome, `public-key-${index}.asc`);
+            fs__WEBPACK_IMPORTED_MODULE_0__.writeFileSync(publicKeyFile, publicKey, { encoding: 'utf-8' });
+            return toGpgPath(publicKeyFile);
+        });
        const options = { silent: true };
        await _actions_exec__WEBPACK_IMPORTED_MODULE_4__/* .exec */ .m('gpg', [
            '--homedir',
            toGpgPath(gpgHome),
            '--batch',
            '--import',
-            toGpgPath(publicKeyFile)
+            ...publicKeyFiles
        ], options);
        await _actions_exec__WEBPACK_IMPORTED_MODULE_4__/* .exec */ .m('gpg', [
            '--homedir',
@@ -741,12 +741,26 @@ class XmlNode {
      this.child.push({ [node.tagname]: node.child });
    }
    // if requested, add the startIndex
+    this.addStartIndex(startIndex);
+  }
+
+  addStartIndex(startIndex) {
    if (startIndex !== undefined) {
      // Note: for now we just overwrite the metadata. If we had more complex metadata,
      // we might need to do an object append here:  metadata = { ...metadata, startIndex }
      this.child[this.child.length - 1][METADATA_SYMBOL] = { startIndex };
    }
  }
+
+  addEndIndex(endIndex) {
+    const lastChild = this.child[this.child.length - 1];
+    // endIndex is write-once: when updateTag drops a node, the last child is a
+    // previously completed sibling whose endIndex must not be overwritten
+    if (lastChild !== undefined && lastChild[METADATA_SYMBOL] !== undefined
+      && lastChild[METADATA_SYMBOL].endIndex === undefined) {
+      lastChild[METADATA_SYMBOL].endIndex = endIndex;
+    }
+  }
  /** symbol used for metadata */
  static getMetaDataSymbol() {
    return METADATA_SYMBOL;
@@ -781,8 +795,23 @@ class DocTypeReader {
            i = i + 9;
            let angleBracketsCount = 1;
            let hasBody = false, comment = false;
+            let quoteChar = null; // tracks an open SYSTEM/PUBLIC literal before the '[' body
            let exp = "";
            for (; i < xmlData.length; i++) {
+                // Inside a quoted external-identifier literal — XML allows '<'
+                // and '>' as plain data here, so they must not be interpreted
+                // as DOCTYPE structure until the matching quote closes.
+                if (quoteChar !== null) {
+                    if (xmlData[i] === quoteChar) quoteChar = null;
+                    exp += xmlData[i];
+                    continue;
+                }
+                if (!hasBody && !comment && (xmlData[i] === '"' || xmlData[i] === "'")) {
+                    quoteChar = xmlData[i];
+                    exp += xmlData[i];
+                    continue;
+                }
+
                if (xmlData[i] === '<' && !comment) { //Determine the tag type
                    if (hasBody && hasSeq(xmlData, "!ENTITY", i)) {
                        i += 7;
@@ -837,7 +866,7 @@ class DocTypeReader {
                    exp += xmlData[i];
                }
            }
-            if (angleBracketsCount !== 0) {
+            if (quoteChar !== null || angleBracketsCount !== 0) {
                throw new Error(`Unclosed DOCTYPE`);
            }
        } else {
@@ -1552,7 +1581,11 @@ function resolveEnotation(str, trimmedStr, options) {
 */
 function trimZeros(numStr) {
    if (numStr && numStr.indexOf(".") !== -1) {//float
-        numStr = numStr.replace(/0+$/, ""); //remove ending zeros
+        //remove ending zeros without the O(n^2) backtracking that /0+$/ hits
+        //when the string doesn't end in 0 but has a long internal zero-run
+        let end = numStr.length;
+        while (end > 0 && numStr.charCodeAt(end - 1) === 48 /* '0' */) end--;
+        numStr = numStr.slice(0, end);
        if (numStr === ".") numStr = "0";
        else if (numStr[0] === ".") numStr = "0" + numStr;
        else if (numStr[numStr.length - 1] === ".") numStr = numStr.substring(0, numStr.length - 1);
@@ -5032,7 +5065,12 @@ const parseXml = function (xmlData) {
        this.matcher.pop();
        this.isCurrentNodeStopNode = false; // Reset flag when closing tag

-        currentNode = this.tagsNodeStack.pop();//avoid recursion, set the parent tag scope
+        //a closing tag with no matching opening tag leaves the stack empty
+        currentNode = this.tagsNodeStack.pop() || xmlObj;//avoid recursion, set the parent tag scope
+
+        if (options.captureMetaData && currentNode) {
+          currentNode.addEndIndex(closeIndex + 1);
+        }
        textData = "";
        i = closeIndex;
      } else if (c1 === 63) { //'?'
@@ -5058,6 +5096,11 @@ const parseXml = function (xmlData) {
            childNode[":@"] = attsMap
          }
          this.addChild(currentNode, childNode, this.readonlyMatcher, i);
+
+          if (options.captureMetaData) {
+            // closeIndex points at '?' of the closing '?>'
+            currentNode.addEndIndex(tagData.closeIndex + 2);
+          }
        }


@@ -5222,6 +5265,10 @@ const parseXml = function (xmlData) {
          this.isCurrentNodeStopNode = false; // Reset flag

          this.addChild(currentNode, childNode, this.readonlyMatcher, startIndex);
+
+          if (options.captureMetaData) {
+            currentNode.addEndIndex(i + 1);
+          }
        } else {
          //selfClosing tag
          if (isSelfClosing) {
@@ -5232,6 +5279,10 @@ const parseXml = function (xmlData) {
              childNode[":@"] = prefixedAttrs;
            }
            this.addChild(currentNode, childNode, this.readonlyMatcher, startIndex);
+
+            if (options.captureMetaData) {
+              currentNode.addEndIndex(closeIndex + 1);
+            }
            this.matcher.pop(); // Pop self-closing tag
            this.isCurrentNodeStopNode = false; // Reset flag
          }
@@ -5241,6 +5292,10 @@ const parseXml = function (xmlData) {
              childNode[":@"] = prefixedAttrs;
            }
            this.addChild(currentNode, childNode, this.readonlyMatcher, startIndex);
+
+            if (options.captureMetaData) {
+              currentNode.addEndIndex(result.closeIndex + 1);
+            }
            this.matcher.pop(); // Pop unpaired tag
            this.isCurrentNodeStopNode = false; // Reset flag
            i = result.closeIndex;
@@ -30801,6 +30801,7 @@ module.exports = {
 /* harmony export */   jv: () => (/* binding */ MAVEN_CENTRAL_REPOSITORY_URL),
 /* harmony export */   kM: () => (/* binding */ INPUT_JDK_FILE),
 /* harmony export */   kN: () => (/* binding */ MAVEN_NO_TRANSFER_PROGRESS_LONG_FLAG),
+/* harmony export */   kQ: () => (/* binding */ SIGNATURE_VERIFICATION_FAILURE_HELP),
 /* harmony export */   ko: () => (/* binding */ MAVEN_GPG_PASSPHRASE_DEFAULT_ENV),
 /* harmony export */   m7: () => (/* binding */ INPUT_MVN_TOOLCHAIN_VENDOR),
 /* harmony export */   nr: () => (/* binding */ INPUT_MVN_TOOLCHAIN_ID),
@@ -30821,7 +30822,7 @@ module.exports = {
 /* harmony export */   xg: () => (/* binding */ MAVEN_CENTRAL_REPOSITORY_ID),
 /* harmony export */   xp: () => (/* binding */ INPUT_DEFAULT_SERVER_PASSWORD)
 /* harmony export */ });
-/* unused harmony exports INPUT_CACHE_READ_ONLY, INPUT_JOB_STATUS */
+/* unused harmony exports SIGNATURE_VERIFICATION_DOCUMENTATION_URL, INPUT_CACHE_READ_ONLY, INPUT_JOB_STATUS */
 const MACOS_JAVA_CONTENT_POSTFIX = 'Contents/Home';
 const INPUT_JAVA_VERSION = 'java-version';
 const INPUT_JAVA_VERSION_FILE = 'java-version-file';
@@ -30836,6 +30837,8 @@ const INPUT_SET_DEFAULT = 'set-default';
 const INPUT_PROBLEM_MATCHER = 'problem-matcher';
 const INPUT_VERIFY_SIGNATURE = 'verify-signature';
 const INPUT_VERIFY_SIGNATURE_PUBLIC_KEY = 'verify-signature-public-key';
+const SIGNATURE_VERIFICATION_DOCUMENTATION_URL = 'https://github.com/actions/setup-java#download-integrity-and-signatures';
+const SIGNATURE_VERIFICATION_FAILURE_HELP = `If this is a legitimate vendor signing-key rotation, see ${SIGNATURE_VERIFICATION_DOCUMENTATION_URL} for instructions to configure the updated public key or temporarily disable signature verification.`;
 const INPUT_MVN_SERVER_CREDENTIALS = 'mvn-server-credentials';
 const INPUT_MVN_REPOSITORIES = 'mvn-repositories';
 const INPUT_MVN_REPOSITORIES_INCLUDE_CENTRAL = 'mvn-repositories-include-central';
@@ -36065,6 +36068,9 @@ function _unique(values) {
 /******/ __nccwpck_require__.m = __webpack_modules__;
 /******/ 
 /************************************************************************/
+/******/ /* webpack/runtime/asset-relocator-loader */
+/******/ if (typeof __nccwpck_require__ !== 'undefined') __nccwpck_require__.ab = decodeURIComponent(new URL('.', import.meta.url).pathname).slice(import.meta.url.match(/^file:\/\/\/\w:/) ? 1 : 0, -1) + "/";
+/******/ 
 /******/ /* webpack/runtime/compat get default export */
 /******/ (() => {
 /******/ 	// getDefaultExport function for compatibility with non-harmony modules
@@ -36157,10 +36163,6 @@ function _unique(values) {
 /******/ 	};
 /******/ })();
 /******/ 
-/******/ /* webpack/runtime/compat */
-/******/ 
-/******/ if (typeof __nccwpck_require__ !== 'undefined') __nccwpck_require__.ab = new URL('.', import.meta.url).pathname.slice(import.meta.url.match(/^file:\/\/\/\w:/) ? 1 : 0, -1) + "/";
-/******/ 
 /******/ /* webpack/runtime/import chunk loading */
 /******/ (() => {
 /******/ 	// no baseURI
@@ -36376,7 +36378,6 @@ async function run() {
    const checkLatest = (0,util/* getBooleanInput */.Vt)(constants/* INPUT_CHECK_LATEST */.YM, false);
    const forceDownload = (0,util/* getBooleanInput */.Vt)(constants/* INPUT_FORCE_DOWNLOAD */.I9, false);
    const setDefault = (0,util/* getBooleanInput */.Vt)(constants/* INPUT_SET_DEFAULT */.E8, true);
-    const verifySignature = (0,util/* getBooleanInput */.Vt)(constants/* INPUT_VERIFY_SIGNATURE */.qy, false);
    const verifySignaturePublicKey = setup_java_core/* getInput */.V4(constants/* INPUT_VERIFY_SIGNATURE_PUBLIC_KEY */.u) || undefined;
    const toolchainIds = setup_java_core/* getMultilineInput */.q3(constants/* INPUT_MVN_TOOLCHAIN_ID */.nr);
    let actionError;
@@ -36404,6 +36405,7 @@ async function run() {
            else if (!distributionName) {
                throw new Error('distribution input is required when not specified in the version file');
            }
+            const verifySignature = getVerifySignatureInput();
            const installerInputsOptions = {
                architecture,
                packageType,
@@ -36428,6 +36430,7 @@ async function run() {
            if (!distributionName) {
                throw new Error('distribution input is required');
            }
+            const verifySignature = getVerifySignatureInput();
            const installerInputsOptions = {
                architecture,
                packageType,
@@ -36492,6 +36495,11 @@ function getJdkFileInput() {
    }
    return jdkFile || deprecatedJdkFile;
 }
+function getVerifySignatureInput() {
+    return setup_java_core/* getInput */.V4(constants/* INPUT_VERIFY_SIGNATURE */.qy).trim()
+        ? (0,util/* getBooleanInput */.Vt)(constants/* INPUT_VERIFY_SIGNATURE */.qy)
+        : undefined;
+}
 async function installVersion(version, options, toolchainId = 0) {
    const { distributionName, jdkFile, architecture, packageType, checkLatest, forceDownload, cacheJdk, setDefault, verifySignature, verifySignaturePublicKey, toolchainIds } = options;
    const installerOptions = {
@@ -1,4 +1,4 @@
-# Contributors
+# Contributing

 Thank you for contributing!

@@ -39,15 +39,6 @@

 See [action.yml](../action.yml) for more details on task inputs.

-> [!NOTE]
-> The examples on this page reference `actions/setup-java@v6`, which is still in
-> development on the `main` branch and is not yet published as a release tag. To
-> try the V6 features documented here (`cache-jdk`, `force-download`,
-> `problem-matcher`, `cache-path`, `cache-read-only`, `java-version: latest`,
-> `oracle-openjdk`, and the `*-env-var` input names), reference
-> `actions/setup-java@main`. For production workflows use the latest stable
-> release, `actions/setup-java@v5`, as shown in the [README](../README.md).
-
 ## Selecting a Java distribution
 `java-version` and `distribution` select what gets installed. `java-version` may be replaced by `java-version-file`, and `distribution` is optional only when `java-version-file` points to a `.sdkmanrc` or `.tool-versions` file that carries a recognized vendor identifier. In every other case both inputs must be provided. See [Supported distributions](../README.md#Supported-distributions) for a list of available options.

@@ -548,18 +539,27 @@ tool-cache installation short-circuits setup, so a changed `jdk-file` is not
 re-extracted for a version that is already installed. Use
 `force-download: true` when the archive contents change but the version does not.

-The verification identity separates unverified downloads from packages verified
-with the distribution's bundled signing key and from packages verified with each
-custom key. Custom public keys are represented by a SHA-256 fingerprint of
-normalized key material; the key itself is not placed in the cache key, the logs,
-or action state. A verified exact-key hit reuses content that was
-signature-verified when it was downloaded by the run that saved the entry,
-instead of downloading and verifying it again.
+The verification identity separates requests that disable signature verification,
+check and warn without enforcement, or explicitly enforce verification. Disabled
+and check-and-warn requests have the same non-enforcement guarantee, but they are
+kept separate so an entry downloaded with verification disabled cannot prevent a
+later check-and-warn request from attempting verification. The identity also
+separates the distribution's bundled signing keys from custom keys. Custom
+public-key sets are represented by a SHA-256 fingerprint of normalized,
+boundary-delimited key material; the keys themselves are not placed in the cache
+key, the logs, or action state. Enforced requests only restore entries created by
+an enforced request whose signature verification succeeded. Check-and-warn entries
+may have been saved after verification succeeded or after a verification failure
+was reported as a warning.
+
+For signature-verification defaults, enforced failure behavior, and recovery from
+a legitimate vendor signing-key rotation, see
+[Download integrity and signatures](../README.md#download-integrity-and-signatures).

 > [!IMPORTANT]
-> The JDK cache **key** is what isolates verification modes and release
-> identity: a JDK cache entry created by an unverified download can never be
-> restored for a request that sets `verify-signature: true`, and vice versa.
+> The JDK cache **key** isolates disabled, check-and-warn, and enforced verification
+> modes as well as release identity. A check-and-warn entry can never be restored
+> for a request that sets `verify-signature: true`, and vice versa.
 > `cache-jdk` does not change how the runner tool cache is used. setup-java
 > first looks for an installation in the runner tool cache — a preinstalled
 > JDK, or one installed by an earlier step of the same job — and uses it as-is. Such an installation is not downloaded again, and its checksum
@@ -16,22 +16,22 @@
        "@actions/http-client": "^4.0.1",
        "@actions/io": "^3.0.2",
        "@actions/tool-cache": "^4.0.0",
-        "fast-xml-parser": "^5.10.1",
+        "fast-xml-parser": "^5.11.0",
        "semver": "^7.8.5"
      },
      "devDependencies": {
        "@eslint/js": "^10.0.1",
        "@jest/globals": "^30.4.1",
-        "@types/node": "^26.1.1",
+        "@types/node": "^26.2.0",
        "@types/semver": "^7.8.0",
        "@typescript-eslint/eslint-plugin": "^8.67.0",
        "@typescript-eslint/parser": "^8.65.0",
-        "@vercel/ncc": "^0.44.0",
-        "eslint": "^10.7.0",
+        "@vercel/ncc": "^0.45.0",
+        "eslint": "^10.8.1",
        "eslint-config-prettier": "^10.1.8",
-        "eslint-plugin-jest": "^29.15.4",
-        "eslint-plugin-n": "^18.2.2",
-        "globals": "^17.9.0",
+        "eslint-plugin-jest": "^29.16.1",
+        "eslint-plugin-n": "^18.3.0",
+        "globals": "^17.11.0",
        "husky": "^9.1.7",
        "jest": "^30.4.2",
        "lint-staged": "^17.3.0",
@@ -1726,9 +1726,9 @@
      "license": "MIT"
    },
    "node_modules/@types/node": {
-      "version": "26.1.2",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-26.1.2.tgz",
-      "integrity": "sha512-Vu4a5UFA9rIIFJ7rB/Vaafh9lrCQszopTCx6KjFboXTGQbPNasehVR5TEiithSDGyd1DEiUByggTZsg8jukeIg==",
+      "version": "26.2.0",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-26.2.0.tgz",
+      "integrity": "sha512-5IviulTZeRNp2vAJ514cc/HUlY5nZ9fCbq9DMyC52BrhFZACo3nI0R7qBxhQmo/d27NFe96ur/b7Wwxklda+kg==",
      "dev": true,
      "license": "MIT",
      "dependencies": {
@@ -1795,6 +1795,189 @@
        "typescript": ">=4.8.4 <6.1.0"
      }
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+        "@typescript-eslint/typescript-estree": "8.67.0",
+        "@typescript-eslint/utils": "8.67.0",
+        "debug": "^4.4.3",
+        "ts-api-utils": "^2.5.0"
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
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    "node_modules/@typescript-eslint/parser": {
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@@ -1820,7 +2003,35 @@
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@typescript-eslint/project-service": "8.67.0",
+        "@typescript-eslint/tsconfig-utils": "8.67.0",
+        "@typescript-eslint/types": "8.67.0",
+        "@typescript-eslint/visitor-keys": "8.67.0",
+        "debug": "^4.4.3",
+        "minimatch": "^10.2.2",
+        "semver": "^7.7.3",
+        "tinyglobby": "^0.2.15",
+        "ts-api-utils": "^2.5.0"
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+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      },
+      "peerDependencies": {
+        "typescript": ">=4.8.4 <6.1.0"
+      }
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+    "node_modules/@typescript-eslint/parser/node_modules/@typescript-eslint/typescript-estree/node_modules/@typescript-eslint/project-service": {
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@@ -1842,6 +2053,23 @@
        "typescript": ">=4.8.4 <6.1.0"
      }
    },
+    "node_modules/@typescript-eslint/parser/node_modules/@typescript-eslint/typescript-estree/node_modules/@typescript-eslint/tsconfig-utils": {
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+      "resolved": "https://registry.npmjs.org/@typescript-eslint/tsconfig-utils/-/tsconfig-utils-8.67.0.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
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+      },
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+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      },
+      "peerDependencies": {
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+      }
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      "version": "8.67.0",
      "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-8.67.0.tgz",
@@ -1860,48 +2088,6 @@
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-      "dev": true,
-      "license": "MIT",
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-        "type": "opencollective",
-        "url": "https://opencollective.com/typescript-eslint"
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-      "version": "8.67.0",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/type-utils/-/type-utils-8.67.0.tgz",
-      "integrity": "sha512-aVWDXbRmdXO9siTfX4ditQI1T9+zVcNazT48EJCD0v40/9RIFoUgZ05CmGEq9H2gixRpjUn/iplwvlcvutJW/Q==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
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-        "@typescript-eslint/typescript-estree": "8.67.0",
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-        "debug": "^4.4.3",
-        "ts-api-utils": "^2.5.0"
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-        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
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-        "type": "opencollective",
-        "url": "https://opencollective.com/typescript-eslint"
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      "version": "8.67.0",
      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-8.67.0.tgz",
@@ -1916,58 +2102,6 @@
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-    "node_modules/@typescript-eslint/typescript-estree": {
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-      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-8.67.0.tgz",
-      "integrity": "sha512-EKQBCE9yNlRJYm7jdTW5AhDacDUmSwQb0FAJAmK2EKYrNXIsa2vxcSZx6PvJ/dEdI6lS+Y9W+EXckLj0iPFGcw==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@typescript-eslint/project-service": "8.67.0",
-        "@typescript-eslint/tsconfig-utils": "8.67.0",
-        "@typescript-eslint/types": "8.67.0",
-        "@typescript-eslint/visitor-keys": "8.67.0",
-        "debug": "^4.4.3",
-        "minimatch": "^10.2.2",
-        "semver": "^7.7.3",
-        "tinyglobby": "^0.2.15",
-        "ts-api-utils": "^2.5.0"
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-        "type": "opencollective",
-        "url": "https://opencollective.com/typescript-eslint"
-      },
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-      }
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-      "version": "8.67.0",
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-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@eslint-community/eslint-utils": "^4.9.1",
-        "@typescript-eslint/scope-manager": "8.67.0",
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-        "@typescript-eslint/typescript-estree": "8.67.0"
-      },
-      "engines": {
-        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
-      },
-      "funding": {
-        "type": "opencollective",
-        "url": "https://opencollective.com/typescript-eslint"
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-      "peerDependencies": {
-        "eslint": "^8.57.0 || ^9.0.0 || ^10.0.0",
-        "typescript": ">=4.8.4 <6.1.0"
-      }
-    },
    "node_modules/@typescript-eslint/visitor-keys": {
      "version": "8.67.0",
      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-8.67.0.tgz",
@@ -2364,9 +2498,9 @@
      ]
    },
    "node_modules/@vercel/ncc": {
-      "version": "0.44.1",
-      "resolved": "https://registry.npmjs.org/@vercel/ncc/-/ncc-0.44.1.tgz",
-      "integrity": "sha512-cUjIE5P2YY1n+Kt9rFIazMMpGoPn1Fic04rOmTkElMkiDP5oszGfERMpo2shVkFKDL7rVppdM2pqJKC59shQWQ==",
+      "version": "0.45.0",
+      "resolved": "https://registry.npmjs.org/@vercel/ncc/-/ncc-0.45.0.tgz",
+      "integrity": "sha512-8zPi1yO2mHpoKTD+e+Bf0ZT3e+sWHSOyGapm9s7b5R0gxJi3CiFTqmeQiMEyu6ejrz2s09M8JkEoUaTWjBJPQQ==",
      "dev": true,
      "license": "MIT",
      "bin": {
@@ -3010,9 +3144,9 @@
      }
    },
    "node_modules/eslint": {
-      "version": "10.8.0",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-10.8.0.tgz",
-      "integrity": "sha512-nuKKvN+oIBO0koN7Tm7dlkmnkc21mtt0QJLwAKzjLq14y6lRTdVG36MZHJ8eQHwdJMwZbQNMlPOYedMq/oVJvQ==",
+      "version": "10.8.1",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-10.8.1.tgz",
+      "integrity": "sha512-wqA7W2jbsC/BnV9Iv1UZpKVFkO1AdNoSmYW8NWG4HNOBbkAMvIqDZ27pI2f07dqn583NcIC44ckjAcOXDL1QbQ==",
      "dev": true,
      "license": "MIT",
      "workspaces": [
@@ -3123,9 +3257,9 @@
      }
    },
    "node_modules/eslint-plugin-jest": {
-      "version": "29.16.0",
-      "resolved": "https://registry.npmjs.org/eslint-plugin-jest/-/eslint-plugin-jest-29.16.0.tgz",
-      "integrity": "sha512-0WFBxDHlT2ratGQfnFQEVIsgQJ5cfd+0IV8Kc6U3X2onB8ATLG23voD2Ch5G9fCkEpCPmCMuzW0tbS0kYb8biw==",
+      "version": "29.16.1",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-jest/-/eslint-plugin-jest-29.16.1.tgz",
+      "integrity": "sha512-tfxOIsjzaBud+f74aLbBMRcnrztt5eCIgnAdeoGdnzMAQ4IdAa/s/p8Ls55mk9MC79N3j2jbv4Qetz6Hclbcfw==",
      "dev": true,
      "license": "MIT",
      "dependencies": {
@@ -3152,10 +3286,101 @@
        }
      }
    },
+    "node_modules/eslint-plugin-jest/node_modules/@typescript-eslint/utils": {
+      "version": "8.67.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/utils/-/utils-8.67.0.tgz",
+      "integrity": "sha512-U9D1FdwEWBwok3hxxSdhclMb0twvt9QnjIQ0VfQ1AiX2epnpSgv2ubVDsayOFyY8K6FX+AQ7E0FKWVG3iKsj1A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@eslint-community/eslint-utils": "^4.9.1",
+        "@typescript-eslint/scope-manager": "8.67.0",
+        "@typescript-eslint/types": "8.67.0",
+        "@typescript-eslint/typescript-estree": "8.67.0"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      },
+      "peerDependencies": {
+        "eslint": "^8.57.0 || ^9.0.0 || ^10.0.0",
+        "typescript": ">=4.8.4 <6.1.0"
+      }
+    },
+    "node_modules/eslint-plugin-jest/node_modules/@typescript-eslint/utils/node_modules/@typescript-eslint/typescript-estree": {
+      "version": "8.67.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-8.67.0.tgz",
+      "integrity": "sha512-EKQBCE9yNlRJYm7jdTW5AhDacDUmSwQb0FAJAmK2EKYrNXIsa2vxcSZx6PvJ/dEdI6lS+Y9W+EXckLj0iPFGcw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@typescript-eslint/project-service": "8.67.0",
+        "@typescript-eslint/tsconfig-utils": "8.67.0",
+        "@typescript-eslint/types": "8.67.0",
+        "@typescript-eslint/visitor-keys": "8.67.0",
+        "debug": "^4.4.3",
+        "minimatch": "^10.2.2",
+        "semver": "^7.7.3",
+        "tinyglobby": "^0.2.15",
+        "ts-api-utils": "^2.5.0"
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+      }
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+      "version": "8.67.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/project-service/-/project-service-8.67.0.tgz",
+      "integrity": "sha512-cvE8c7ulYeXN9fYuszhCeCsbzyVEXuhrRCybnBre7TUmqb5nRmBfQAwCj0O3WJFDeyAZt4VYv51vMCC9LHSdYw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@typescript-eslint/tsconfig-utils": "^8.67.0",
+        "@typescript-eslint/types": "^8.67.0",
+        "debug": "^4.4.3"
+      },
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+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
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+        "url": "https://opencollective.com/typescript-eslint"
+      },
+      "peerDependencies": {
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+      }
+    },
+    "node_modules/eslint-plugin-jest/node_modules/@typescript-eslint/utils/node_modules/@typescript-eslint/typescript-estree/node_modules/@typescript-eslint/tsconfig-utils": {
+      "version": "8.67.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/tsconfig-utils/-/tsconfig-utils-8.67.0.tgz",
+      "integrity": "sha512-vV+LUSv5njUWsknE71fqKTlXUva+R76SaeORd6Zojcunk/6DvKFXONU3BrAs2H49mbygUXt6gbYunzwqNwlhdg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      },
+      "peerDependencies": {
+        "typescript": ">=4.8.4 <6.1.0"
+      }
+    },
    "node_modules/eslint-plugin-n": {
-      "version": "18.2.2",
-      "resolved": "https://registry.npmjs.org/eslint-plugin-n/-/eslint-plugin-n-18.2.2.tgz",
-      "integrity": "sha512-gOO0lIqwEjZ750kv9/SptCWArUoAZXJoBr0vYWTO2dCBxctHUXlBIigiC8xuxxr/NKqgIT6Ehz1xRcilj8a5cA==",
+      "version": "18.3.0",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-n/-/eslint-plugin-n-18.3.0.tgz",
+      "integrity": "sha512-cPVguuDe6DrIPb/qUXHf8P89MaVTUmiYWwpt5gX5AILsvRIiZAxMFXcFR6QHYBksqKJpjfUBlL/RleCJUWcD7w==",
      "dev": true,
      "license": "MIT",
      "dependencies": {
@@ -3463,9 +3688,9 @@
      }
    },
    "node_modules/fast-xml-parser": {
-      "version": "5.10.1",
-      "resolved": "https://registry.npmjs.org/fast-xml-parser/-/fast-xml-parser-5.10.1.tgz",
-      "integrity": "sha512-IEMIf7298kXuZSRFoGfMYrl7is8LpavODgbNz1cwIudv7KwVFnuU+UsMporfq6PD6aXSlawZlARiA3UywCTfMw==",
+      "version": "5.11.0",
+      "resolved": "https://registry.npmjs.org/fast-xml-parser/-/fast-xml-parser-5.11.0.tgz",
+      "integrity": "sha512-9IGxMqvqLOnqP+Egi1nqDHKv5k8aZ7r9n558enxcucmyVGEBNPAU+MOg/8jPIS7rO7sSq4gFm1/nHtiaubMruw==",
      "funding": [
        {
          "type": "github",
@@ -3478,7 +3703,7 @@
        "fast-xml-builder": "^1.2.0",
        "is-unsafe": "^2.0.0",
        "path-expression-matcher": "^1.6.2",
-        "strnum": "^2.4.1",
+        "strnum": "^2.4.2",
        "xml-naming": "^0.3.0"
      },
      "bin": {
@@ -3691,9 +3916,9 @@
      }
    },
    "node_modules/globals": {
-      "version": "17.9.0",
-      "resolved": "https://registry.npmjs.org/globals/-/globals-17.9.0.tgz",
-      "integrity": "sha512-m/MvAW61QVU5VDNF1Vj8axt016h8w7L5TU1e9zlab7XIttAT2YAlCwl75K1fOqvMM9apmD7lbCIRhpfkhmxhCg==",
+      "version": "17.11.0",
+      "resolved": "https://registry.npmjs.org/globals/-/globals-17.11.0.tgz",
+      "integrity": "sha512-Z2I8hM+PbJDXQDq3Icgpzv+mPdwr68iZUU9d5WW4FuXfDUQfkZaZuvjMv42/5crNyw154+9+VWXbYrUgDXbxNw==",
      "dev": true,
      "license": "MIT",
      "engines": {
@@ -5530,9 +5755,9 @@
      }
    },
    "node_modules/strnum": {
-      "version": "2.4.1",
-      "resolved": "https://registry.npmjs.org/strnum/-/strnum-2.4.1.tgz",
-      "integrity": "sha512-M9eUSMT2dCB2cTNPG7UYj6KuK7RJR2SN2+yCV/fTW3xzTCS6EaGZ5pSMgDIjB7r8zSfTGk+dvvn9rTjpVS9Mwg==",
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/strnum/-/strnum-2.4.2.tgz",
+      "integrity": "sha512-rDG3Ah4TV0k1hWvLSzkZtMmLN9+eS+h3knq4MP6A42Y3Yh5qGNnOUs1jJkoSr8FG5dsL28c7KgkIBzSEykqtuw==",
      "funding": [
        {
          "type": "github",
@@ -49,22 +49,22 @@
    "@actions/http-client": "^4.0.1",
    "@actions/io": "^3.0.2",
    "@actions/tool-cache": "^4.0.0",
-    "fast-xml-parser": "^5.10.1",
+    "fast-xml-parser": "^5.11.0",
    "semver": "^7.8.5"
  },
  "devDependencies": {
    "@eslint/js": "^10.0.1",
    "@jest/globals": "^30.4.1",
-    "@types/node": "^26.1.1",
+    "@types/node": "^26.2.0",
    "@types/semver": "^7.8.0",
    "@typescript-eslint/eslint-plugin": "^8.67.0",
    "@typescript-eslint/parser": "^8.65.0",
-    "@vercel/ncc": "^0.44.0",
-    "eslint": "^10.7.0",
+    "@vercel/ncc": "^0.45.0",
+    "eslint": "^10.8.1",
    "eslint-config-prettier": "^10.1.8",
-    "eslint-plugin-jest": "^29.15.4",
-    "eslint-plugin-n": "^18.2.2",
-    "globals": "^17.9.0",
+    "eslint-plugin-jest": "^29.16.1",
+    "eslint-plugin-n": "^18.3.0",
+    "globals": "^17.11.0",
    "husky": "^9.1.7",
    "jest": "^30.4.2",
    "lint-staged": "^17.3.0",
@@ -12,6 +12,9 @@ export const INPUT_SET_DEFAULT = 'set-default';
 export const INPUT_PROBLEM_MATCHER = 'problem-matcher';
 export const INPUT_VERIFY_SIGNATURE = 'verify-signature';
 export const INPUT_VERIFY_SIGNATURE_PUBLIC_KEY = 'verify-signature-public-key';
+export const SIGNATURE_VERIFICATION_DOCUMENTATION_URL =
+  'https://github.com/actions/setup-java#download-integrity-and-signatures';
+export const SIGNATURE_VERIFICATION_FAILURE_HELP = `If this is a legitimate vendor signing-key rotation, see ${SIGNATURE_VERIFICATION_DOCUMENTATION_URL} for instructions to configure the updated public key or temporarily disable signature verification.`;
 export const INPUT_MVN_SERVER_CREDENTIALS = 'mvn-server-credentials';
 export const INPUT_MVN_REPOSITORIES = 'mvn-repositories';
 export const INPUT_MVN_REPOSITORIES_INCLUDE_CENTRAL =
@@ -9,12 +9,13 @@ import {
  getToolcachePath,
  isVersionSatisfies
 } from '../util.js';
-import {
+import type {
  ChecksumAlgorithm,
  ChecksumMetadata,
  JavaDownloadRelease,
  JavaInstallerOptions,
-  JavaInstallerResults
+  JavaInstallerResults,
+  SignatureVerificationKey
 } from './base-models.js';
 import {MACOS_JAVA_CONTENT_POSTFIX} from '../constants.js';
 import {RetryingHttpClient} from '../retrying-http-client.js';
@@ -44,7 +45,8 @@ export abstract class JavaBase {
  private floatingVersionVerified = false;
  protected setDefault: boolean;
  protected verifySignature: boolean;
-  protected verifySignaturePublicKey: string | undefined;
+  protected verifySignatureExplicitlyRequested: boolean;
+  protected verifySignaturePublicKey: SignatureVerificationKey | undefined;

  constructor(
    protected distribution: string,
@@ -68,7 +70,10 @@ export abstract class JavaBase {
      installerOptions.setDefault !== undefined
        ? installerOptions.setDefault
        : true;
-    this.verifySignature = installerOptions.verifySignature ?? false;
+    this.verifySignature =
+      installerOptions.verifySignature ?? this.supportsSignatureVerification();
+    this.verifySignatureExplicitlyRequested =
+      installerOptions.verifySignature === true;
    this.verifySignaturePublicKey = installerOptions.verifySignaturePublicKey;
  }

@@ -368,6 +373,7 @@ export abstract class JavaBase {
      source: this.getJdkReleaseIdentity(javaRelease),
      verification: getJdkVerificationIdentity(
        this.verifySignature,
+        this.verifySignatureExplicitlyRequested,
        this.verifySignaturePublicKey
      ),
      path: this.getJdkCachePath(javaRelease.version)
@@ -1,3 +1,5 @@
+export type SignatureVerificationKey = string | readonly string[];
+
 export interface JavaInstallerOptions {
  version: string;
  architecture: string;
@@ -7,7 +9,7 @@ export interface JavaInstallerOptions {
  cacheJdk?: boolean;
  setDefault?: boolean;
  verifySignature?: boolean;
-  verifySignaturePublicKey?: string;
+  verifySignaturePublicKey?: SignatureVerificationKey;
 }

 export interface JavaInstallerResults {
@@ -65,7 +65,7 @@ export class LocalDistribution extends JavaBase {
          architecture: this.architecture,
          version: this.version,
          source,
-          verification: getJdkVerificationIdentity(false),
+          verification: getJdkVerificationIdentity(false, false),
          path: this.getJdkCachePath(this.version)
        };
      }
@@ -12,6 +12,7 @@ import {
 } from '../../util.js';
 import * as gpg from '../../gpg.js';
 import {MICROSOFT_PUBLIC_KEY} from './microsoft-key.js';
+import {SIGNATURE_VERIFICATION_FAILURE_HELP} from '../../constants.js';
 import * as core from '@actions/core';
 import * as tc from '@actions/tool-cache';
 import fs from 'fs';
@@ -34,22 +35,31 @@ export class MicrosoftDistributions extends JavaBase {
    let javaArchivePath = await this.downloadAndVerify(javaRelease);

    if (this.verifySignature) {
-      if (!javaRelease.signatureUrl) {
-        throw new Error(
-          `Input 'verify-signature' is enabled, but no signature URL was found for Microsoft Build of OpenJDK version ${javaRelease.version}.`
-        );
-      }
-      core.info(`Verifying Java package signature...`);
      try {
-        await gpg.verifyPackageSignature(
-          javaArchivePath,
-          javaRelease.signatureUrl,
-          this.verifySignaturePublicKey ?? MICROSOFT_PUBLIC_KEY
-        );
+        if (!javaRelease.signatureUrl) {
+          throw new Error(
+            `Input 'verify-signature' is enabled, but no signature URL was found for Microsoft Build of OpenJDK version ${javaRelease.version}.`
+          );
+        }
+        core.info(`Verifying Java package signature...`);
+        try {
+          await gpg.verifyPackageSignature(
+            javaArchivePath,
+            javaRelease.signatureUrl,
+            this.verifySignaturePublicKey ?? MICROSOFT_PUBLIC_KEY
+          );
+        } catch (error) {
+          throw new Error(
+            `Failed to verify signature for Microsoft Build of OpenJDK version ${javaRelease.version}. Signature URL: ${javaRelease.signatureUrl}. Error: ${(error as Error).message} ${SIGNATURE_VERIFICATION_FAILURE_HELP}`,
+            {cause: error}
+          );
+        }
      } catch (error) {
-        throw new Error(
-          `Failed to verify signature for Microsoft Build of OpenJDK version ${javaRelease.version}. Signature URL: ${javaRelease.signatureUrl}. Error: ${(error as Error).message}`,
-          {cause: error}
+        if (this.verifySignatureExplicitlyRequested) {
+          throw error;
+        }
+        core.warning(
+          error instanceof Error ? error.message : `Unknown error: ${error}`
        );
      }
    }
@@ -8,7 +8,10 @@ import * as gpg from '../../gpg.js';
 import {ADOPTIUM_PUBLIC_KEY} from './adoptium-key.js';
 import {JavaBase} from '../base-installer.js';
 import {ITemurinAvailableVersions} from './models.js';
-import {MACOS_JAVA_CONTENT_POSTFIX} from '../../constants.js';
+import {
+  MACOS_JAVA_CONTENT_POSTFIX,
+  SIGNATURE_VERIFICATION_FAILURE_HELP
+} from '../../constants.js';
 import {
  JavaDownloadRelease,
  JavaInstallerOptions,
@@ -141,24 +144,41 @@ export class TemurinDistribution extends JavaBase {
    const archivePath = await this.downloadAndVerify(release);

    if (this.verifySignature) {
-      if (!release.signatureUrl) {
-        throw new Error(
-          `Input 'verify-signature' is enabled, but no signature URL was found for Temurin version ${release.version}.`
-        );
-      }
-      core.info(`Verifying Java package signature...`);
      try {
-        await gpg.verifyPackageSignature(
-          archivePath,
-          release.signatureUrl,
-          this.verifySignaturePublicKey ?? ADOPTIUM_PUBLIC_KEY
-        );
+        if (!(await gpg.isGpgAvailable())) {
+          throw new Error(
+            "Input 'verify-signature' is enabled, but gpg is not available."
+          );
+        }
+        if (!release.signatureUrl) {
+          throw new Error(
+            `Input 'verify-signature' is enabled, but no signature URL was found for Temurin version ${release.version}.`
+          );
+        }
+        core.info(`Verifying Java package signature...`);
+        try {
+          await gpg.verifyPackageSignature(
+            archivePath,
+            release.signatureUrl,
+            this.verifySignaturePublicKey ?? ADOPTIUM_PUBLIC_KEY
+          );
+        } catch (error) {
+          const verificationError = new Error(
+            `Failed to verify signature for Temurin version ${release.version} from ${release.signatureUrl}: ${(error as Error).message} ${SIGNATURE_VERIFICATION_FAILURE_HELP}`,
+            {cause: error}
+          );
+          if (this.verifySignatureExplicitlyRequested) {
+            throw verificationError;
+          } else {
+            core.warning(verificationError.message);
+          }
+        }
      } catch (error) {
-        throw new Error(
-          `Failed to verify signature for Temurin version ${release.version} from ${release.signatureUrl}: ${
-            (error as Error).message
-          }`,
-          {cause: error}
+        if (this.verifySignatureExplicitlyRequested) {
+          throw error;
+        }
+        core.warning(
+          error instanceof Error ? error.message : `Unknown error: ${error}`
        );
      }
    }
@@ -5,11 +5,16 @@ import * as io from '@actions/io';
 import * as exec from '@actions/exec';
 import * as tc from '@actions/tool-cache';
 import * as util from './util.js';
-import {ExecOptions} from '@actions/exec';
+import type {ExecOptions} from '@actions/exec';
+import type {SignatureVerificationKey} from './distributions/base-models.js';

 export const GPG_HOME_PREFIX = 'setup-java-gpg-';
 const VERIFY_GPG_HOME_PREFIX = 'verify-signature-gpg-home-';

+export async function isGpgAvailable(): Promise<boolean> {
+  return Boolean(await io.which('gpg', false));
+}
+
 // Convert a Windows path (D:\a\_temp\...) to a POSIX path (/d/a/_temp/...).
 // The Git-bundled GPG on Windows (MSYS2-based) uses POSIX path conventions
 // internally. Passing Windows paths with backslashes can cause fatal GPG errors
@@ -97,7 +102,7 @@ export async function removeGpgHome(gpgHome: string): Promise<void> {
 export async function verifyPackageSignature(
  archivePath: string,
  signatureUrl: string,
-  publicKeyContent: string
+  publicKeyContent: SignatureVerificationKey
 ) {
  const signaturePath = await tc.downloadTool(signatureUrl);
  let gpgHome: string;
@@ -117,8 +122,14 @@ export async function verifyPackageSignature(
    );
  }
  try {
-    const publicKeyFile = path.join(gpgHome, 'public-key.asc');
-    fs.writeFileSync(publicKeyFile, publicKeyContent, {encoding: 'utf-8'});
+    const publicKeys = Array.isArray(publicKeyContent)
+      ? publicKeyContent
+      : [publicKeyContent];
+    const publicKeyFiles = publicKeys.map((publicKey, index) => {
+      const publicKeyFile = path.join(gpgHome, `public-key-${index}.asc`);
+      fs.writeFileSync(publicKeyFile, publicKey, {encoding: 'utf-8'});
+      return toGpgPath(publicKeyFile);
+    });
    const options: ExecOptions = {silent: true};
    await exec.exec(
      'gpg',
@@ -127,7 +138,7 @@ export async function verifyPackageSignature(
        toGpgPath(gpgHome),
        '--batch',
        '--import',
-        toGpgPath(publicKeyFile)
+        ...publicKeyFiles
      ],
      options
    );
@@ -4,6 +4,7 @@ import path from 'path';
 import * as cache from '@actions/cache';
 import * as core from '@actions/core';
 import {isCacheFeatureAvailable} from './cache-feature.js';
+import type {SignatureVerificationKey} from './distributions/base-models.js';

 const STATE_JDK_CACHES = 'jdk-caches';
 const JDK_CACHE_KEY_VERSION = 1;
@@ -117,18 +118,30 @@ function getInstallationIdentity(

 export function getJdkVerificationIdentity(
  verifySignature: boolean,
-  publicKey?: string
+  enforceSignatureVerification: boolean,
+  publicKey?: SignatureVerificationKey
 ): string {
  if (!verifySignature) {
-    return 'unverified';
+    return 'disabled';
  }
+  const verificationPolicy = enforceSignatureVerification
+    ? 'enforced'
+    : 'check-and-warn';
  if (!publicKey) {
-    return 'verified:bundled';
+    return `${verificationPolicy}:bundled`;
  }

-  const normalizedKey = publicKey.replace(/\r\n?/g, '\n').trim();
-  const fingerprint = createHash('sha256').update(normalizedKey).digest('hex');
-  return `verified:custom:sha256:${fingerprint}`;
+  const publicKeys = Array.isArray(publicKey) ? publicKey : [publicKey];
+  const normalizedKeys = publicKeys.map(key =>
+    key.replace(/\r\n?/g, '\n').trim()
+  );
+  const fingerprintSource = Array.isArray(publicKey)
+    ? normalizedKeys.map(key => `${Buffer.byteLength(key)}:${key}`).join('')
+    : normalizedKeys[0];
+  const fingerprint = createHash('sha256')
+    .update(fingerprintSource)
+    .digest('hex');
+  return `${verificationPolicy}:custom:sha256:${fingerprint}`;
 }

 export async function saveJdkCaches(): Promise<void> {
@@ -29,10 +29,6 @@ export async function run() {
  const checkLatest = getBooleanInput(constants.INPUT_CHECK_LATEST, false);
  const forceDownload = getBooleanInput(constants.INPUT_FORCE_DOWNLOAD, false);
  const setDefault = getBooleanInput(constants.INPUT_SET_DEFAULT, true);
-  const verifySignature = getBooleanInput(
-    constants.INPUT_VERIFY_SIGNATURE,
-    false
-  );
  const verifySignaturePublicKey =
    core.getInput(constants.INPUT_VERIFY_SIGNATURE_PUBLIC_KEY) || undefined;
  const toolchainIds = core.getMultilineInput(constants.INPUT_MVN_TOOLCHAIN_ID);
@@ -80,6 +76,8 @@ export async function run() {
        );
      }

+      const verifySignature = getVerifySignatureInput();
+
      const installerInputsOptions: installerInputsOptions = {
        architecture,
        packageType,
@@ -107,6 +105,8 @@ export async function run() {
        throw new Error('distribution input is required');
      }

+      const verifySignature = getVerifySignatureInput();
+
      const installerInputsOptions: installerInputsOptions = {
        architecture,
        packageType,
@@ -192,6 +192,12 @@ function getJdkFileInput(): string {
  return jdkFile || deprecatedJdkFile;
 }

+function getVerifySignatureInput(): boolean | undefined {
+  return core.getInput(constants.INPUT_VERIFY_SIGNATURE).trim()
+    ? getBooleanInput(constants.INPUT_VERIFY_SIGNATURE)
+    : undefined;
+}
+
 async function installVersion(
  version: string,
  options: installerInputsOptions,
@@ -263,7 +269,7 @@ interface installerInputsOptions {
  forceDownload: boolean;
  cacheJdk: boolean;
  setDefault: boolean;
-  verifySignature: boolean;
+  verifySignature: boolean | undefined;
  verifySignaturePublicKey: string | undefined;
  distributionName: string;
  jdkFile: string;
Author	SHA1	Message	Date
Bruno Borges GitHub John	0781fc6af3	Fix alpine failures by switching default back to only warn on verification failures. To prevent build failures due to missing GPG or rotated vendor keys. (#1262 ) Also allow multiple GPG keys to be provided. Co-authored-by: John <1615532+johnoliver@users.noreply.github.com>	2026-09-03 13:27:24 -04:00
Copilot GitHub brunoborges Copilot Appcopilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>Bruno Borges	4889c4aff5	Fix Temurin EA E2E signature verification (#1260 ) * Configure Temurin EA E2E signature verification Co-authored-by: brunoborges <129743+brunoborges@users.noreply.github.com> * Disable signature verification for Temurin EA E2E Co-authored-by: brunoborges <129743+brunoborges@users.noreply.github.com> * Fix Temurin EA signature verification scope Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 7ac2d888-2383-49c7-9178-da5455a10034 --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: brunoborges <129743+brunoborges@users.noreply.github.com> Co-authored-by: Bruno Borges <brborges@microsoft.com> Copilot-Session: 7ac2d888-2383-49c7-9178-da5455a10034	2026-09-03 10:34:10 -04:00
Copilot GitHubcopilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>	8fd3240085	[WIP] Fix failing GitHub Actions job for temurin 17 (#1259 ) * Initial plan * Install GnuPG in Alpine E2E job --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>	2026-09-03 07:39:25 -04:00
dependabot[bot]GitHub Copilot Appdependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>Bruno Borges	2732291815	chore(deps-dev): update eslint and globals (#1256 ) * chore(deps-dev): bump the monthly-npm-updates group with 3 updates Bumps the monthly-npm-updates group with 3 updates: [eslint](https://github.com/eslint/eslint), [globals](https://github.com/sindresorhus/globals) and [typescript](https://github.com/microsoft/TypeScript). Updates `eslint` from 10.8.0 to 10.8.1 - [Release notes](https://github.com/eslint/eslint/releases) - [Commits](https://github.com/eslint/eslint/compare/v10.8.0...v10.8.1) Updates `globals` from 17.9.0 to 17.11.0 - [Release notes](https://github.com/sindresorhus/globals/releases) - [Commits](https://github.com/sindresorhus/globals/compare/v17.9.0...v17.11.0) Updates `typescript` from 6.0.3 to 7.0.2 - [Release notes](https://github.com/microsoft/TypeScript/releases) - [Commits](https://github.com/microsoft/TypeScript/compare/v6.0.3...v7.0.2) --- updated-dependencies: - dependency-name: eslint dependency-version: 10.8.1 dependency-type: direct:development update-type: version-update:semver-patch dependency-group: monthly-npm-updates - dependency-name: globals dependency-version: 17.11.0 dependency-type: direct:development update-type: version-update:semver-minor dependency-group: monthly-npm-updates - dependency-name: typescript dependency-version: 7.0.2 dependency-type: direct:development update-type: version-update:semver-major dependency-group: monthly-npm-updates ... Signed-off-by: dependabot[bot] <support@github.com> * fix(deps): keep TypeScript on supported version TypeScript 7 is outside the peer dependency ranges supported by typescript-eslint and ts-jest, causing npm ci to fail before dist can be rebuilt. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: f1ca1f37-990b-4feb-9e3d-708cfdccbb6e --------- Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> Co-authored-by: Bruno Borges <brborges@microsoft.com> Copilot-Session: f1ca1f37-990b-4feb-9e3d-708cfdccbb6e	2026-08-24 13:26:11 -04:00
Bruno Borges GitHub Copilot App	1a8f22b7f7	chore: streamline Dependabot updates (#1255 ) Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 916e0cf3-84f7-43fa-9822-3dac5cf8c5e6	2026-08-24 12:32:37 -04:00
Bruno Borges GitHub Copilot App	85030b78b5	docs: complete v6 release highlights (#1254 ) Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: bb8de955-60c9-4a56-a7a2-d0be5d32dbc4	2026-08-24 12:03:01 -04:00
Bruno Borges GitHub Copilot App	dd06d9cba3	Prepare documentation for v6 release (#1253 ) Update public examples and release messaging to make v6 the recommended stable version, include late-cycle v6 features, and increase the JetBrains test timeout to avoid cold-run flakes. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 24e3d384-3bda-4ca3-b1fc-f49e340c174f	2026-08-24 11:49:23 -04:00
Bruno Borges GitHub Copilot App	59b3450628	chore(deps): combine open Dependabot npm updates (#1252 ) * Combine Dependabot npm updates Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> * Rebuild action bundles Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: a5d254ad-e29c-4477-ae66-cba6e36d7e03 * Update Licensed cache for XML dependencies Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: a5d254ad-e29c-4477-ae66-cba6e36d7e03 --------- Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: a5d254ad-e29c-4477-ae66-cba6e36d7e03	2026-08-24 10:36:54 -04:00
JohnandGitHub	b96213d9d2	Set default signature verification for supported distributions (#1246 ) * Default signature verification for supported distributions * Delegate signature defaults to installers	2026-08-24 10:08:03 -04:00
Bruno Borges GitHub Copilot App	1dbac3c9e1	docs: expose contributing guide to GitHub (#1245 ) Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 684fec44-989a-4d0e-a42b-79efbda28933	2026-08-18 14:16:28 -04:00
Philip GaiandGitHub	11741d6cfa	ci: constrain cache e2e job modes (#1244 ) * ci: constrain cache e2e job modes * ci: constrain cache benchmark job modes	2026-08-18 10:56:27 -04:00
Bruno Borges GitHub Copilot App	ff99aa1c87	Fix Oracle macOS E2E version (#1243 ) Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: d4f1997e-98a5-4dec-b5fc-2f0fcf1abd27	2026-08-17 21:23:19 -04:00