@@ -29,3 +29,7 @@ crates/socket-patch-core/tests/fixtures/vendor/** -text
 # compares the result byte for byte, so a CRLF checkout would change both
 # the replayed wiring files and the expected revert.
 crates/socket-patch-cli/tests/fixtures/legacy-ledgers/** -text
+
+# The owned Gradle settings script is embedded with include_str! and
+# written into user repos byte for byte; a CRLF checkout would change it.
+crates/socket-patch-core/src/vendor/jvm/socket-patch.settings.gradle -text
@@ -729,7 +729,8 @@ jobs:
           retention-days: 3
 
   e2e:
-    needs: [test, e2e-build]
+    # These jobs consume e2e-build's binaries and can run alongside unit tests.
+    needs: [e2e-build]
     strategy:
       fail-fast: false
       matrix:
@@ -1069,6 +1070,18 @@ jobs:
           - {os: ubuntu-latest, suite: e2e_vendor_maven_build, maven: '3.9.16'}
           - {os: ubuntu-latest, suite: e2e_vendor_maven_build, maven: '4.0.0-rc-6'}
           - {os: macos-latest, suite: e2e_vendor_maven_build, maven: '3.9.16'}
+          - {os: ubuntu-latest, suite: e2e_vendor_jvm_build, maven: '3.6.3', test_filter: '--ignored maven_reactor'}
+          - {os: ubuntu-latest, suite: e2e_vendor_jvm_build, maven: '3.8.9', test_filter: '--ignored maven_reactor'}
+          - {os: ubuntu-latest, suite: e2e_vendor_jvm_build, maven: '3.9.2', test_filter: '--ignored maven_reactor'}
+          - {os: ubuntu-latest, suite: e2e_vendor_jvm_build, maven: '3.9.16', test_filter: '--ignored maven_reactor'}
+          - {os: ubuntu-latest, suite: e2e_vendor_jvm_build, maven: '4.0.0-rc-6', test_filter: '--ignored maven_reactor'}
+          - {os: macos-latest, suite: e2e_vendor_jvm_build, maven: '3.9.16', test_filter: '--ignored maven_reactor'}
+          - {os: windows-latest, suite: e2e_vendor_jvm_build, maven: '3.9.16', test_filter: '--ignored maven_reactor'}
+          - {os: ubuntu-latest, suite: e2e_vendor_jvm_build, gradle: '6.9.4', java: '11', test_filter: '--ignored gradle_multi_project'}
+          - {os: ubuntu-latest, suite: e2e_vendor_jvm_build, gradle: '7.6.4', java: '17', test_filter: '--ignored gradle_multi_project'}
+          - {os: ubuntu-latest, suite: e2e_vendor_jvm_build, gradle: '8.14.3', java: '17', test_filter: '--ignored gradle_multi_project'}
+          - {os: ubuntu-latest, suite: e2e_vendor_jvm_build, gradle: '9.8.0', java: '17', test_filter: '--ignored gradle_multi_project'}
+          - {os: windows-latest, suite: e2e_vendor_jvm_build, gradle: '8.14.3', java: '17', test_filter: '--ignored gradle_multi_project'}
           # Real .NET SDK capstones: hosted + vendored nuget, one leg per SDK
           # major (the suite pins the major through a sandbox global.json):
           # the oldest and newest here, 7-9 on ubuntu in e2e-full.
@@ -1238,28 +1251,46 @@ jobs:
           php-version: '8.2'
           tools: composer:${{ matrix.composer }}
 
-      - name: Setup Java (Maven legs)
-        if: matrix.maven != ''
+      - name: Setup Java (Maven and Gradle legs)
+        if: matrix.maven != '' || matrix.gradle != ''
         uses: actions/setup-java@de7274f081f381c8f8158605e0321c36c376e2e6 # v6.0.1
         with:
           distribution: temurin
-          java-version: '17'
+          java-version: ${{ matrix.java || '17' }}
 
-      - name: Install Maven ${{ matrix.maven }}
-        if: matrix.maven != ''
+      - name: Install Maven ${{ matrix.maven || '3.9.16' }}
+        if: matrix.maven != '' || matrix.gradle != ''
         # Straight from the Apache archive (sha512-verified), so a leg gets
         # exactly the release it names rather than the runner's Maven.
         shell: bash
         env:
-          MAVEN_VERSION: ${{ matrix.maven }}
+          MAVEN_VERSION: ${{ matrix.maven || '3.9.16' }}
         run: |
           major="${MAVEN_VERSION%%.*}"
           url="https://archive.apache.org/dist/maven/maven-${major}/${MAVEN_VERSION}/binaries/apache-maven-${MAVEN_VERSION}-bin.tar.gz"
           curl -fsSL --retry 3 "$url" -o "$RUNNER_TEMP/maven.tgz"
-          sum="$(curl -fsSL --retry 3 "$url.sha512" | cut -d' ' -f1)"
-          echo "$sum  $RUNNER_TEMP/maven.tgz" | shasum -a 512 -c -
-          tar -xzf "$RUNNER_TEMP/maven.tgz" -C "$RUNNER_TEMP"
-          echo "SOCKET_PATCH_MAVEN_E2E_MVN=$RUNNER_TEMP/apache-maven-${MAVEN_VERSION}/bin/mvn" >> "$GITHUB_ENV"
+          curl -fsSL --retry 3 "$url.sha512" -o "$RUNNER_TEMP/maven.sha512"
+          python -c 'import hashlib, pathlib, os; p=pathlib.Path(os.environ["RUNNER_TEMP"]); assert hashlib.sha512((p/"maven.tgz").read_bytes()).hexdigest() == (p/"maven.sha512").read_text().split()[0]'
+          # Python accepts native Windows paths for both archive and destination.
+          python -m tarfile -e "$RUNNER_TEMP/maven.tgz" "$RUNNER_TEMP"
+          launcher="$RUNNER_TEMP/apache-maven-${MAVEN_VERSION}/bin/mvn"
+          if [ "$RUNNER_OS" = Windows ]; then launcher="${launcher}.cmd"; fi
+          echo "SOCKET_PATCH_MAVEN_E2E_MVN=$launcher" >> "$GITHUB_ENV"
+
+      - name: Install Gradle ${{ matrix.gradle }}
+        if: matrix.gradle != ''
+        shell: bash
+        env:
+          GRADLE_VERSION: ${{ matrix.gradle }}
+        run: |
+          url="https://services.gradle.org/distributions/gradle-${GRADLE_VERSION}-bin.zip"
+          curl -fsSL --retry 3 "$url" -o "$RUNNER_TEMP/gradle.zip"
+          curl -fsSL --retry 3 "$url.sha256" -o "$RUNNER_TEMP/gradle.sha256"
+          python -c 'import hashlib, pathlib, os; p=pathlib.Path(os.environ["RUNNER_TEMP"]); assert hashlib.sha256((p/"gradle.zip").read_bytes()).hexdigest() == (p/"gradle.sha256").read_text().strip()'
+          unzip -q "$RUNNER_TEMP/gradle.zip" -d "$RUNNER_TEMP"
+          launcher="$RUNNER_TEMP/gradle-${GRADLE_VERSION}/bin/gradle"
+          if [ "$RUNNER_OS" = Windows ]; then launcher="${launcher}.bat"; fi
+          echo "SOCKET_PATCH_GRADLE_E2E_GRADLE=$launcher" >> "$GITHUB_ENV"
 
       - name: Setup .NET SDK
         if: matrix.dotnet != ''
@@ -1363,8 +1394,10 @@ jobs:
           SOCKET_PATCH_BUNDLER_E2E_VERSION: ${{ matrix.bundler }}
           SOCKET_PATCH_COMPOSER_E2E_REQUIRED: ${{ matrix.composer != '' && '1' || '' }}
           SOCKET_PATCH_COMPOSER_E2E_VERSION: ${{ matrix.composer }}
-          SOCKET_PATCH_MAVEN_E2E_REQUIRED: ${{ matrix.maven != '' && '1' || '' }}
-          SOCKET_PATCH_MAVEN_E2E_VERSION: ${{ matrix.maven }}
+          SOCKET_PATCH_MAVEN_E2E_REQUIRED: ${{ (matrix.maven != '' || matrix.gradle != '') && '1' || '' }}
+          SOCKET_PATCH_MAVEN_E2E_VERSION: ${{ matrix.maven || (matrix.gradle != '' && '3.9.16') || '' }}
+          SOCKET_PATCH_GRADLE_E2E_REQUIRED: ${{ matrix.gradle != '' && '1' || '' }}
+          SOCKET_PATCH_GRADLE_E2E_VERSION: ${{ matrix.gradle }}
           SOCKET_PATCH_DOTNET_E2E_REQUIRED: ${{ matrix.dotnet != '' && '1' || '' }}
           SOCKET_PATCH_DOTNET_E2E_VERSION: ${{ matrix.dotnet }}
           SOCKET_PATCH_DENO_E2E_REQUIRED: ${{ matrix.deno != '' && '1' || '' }}
 
@@ -70,6 +70,12 @@ and `vendor` (committed patched packages), with `list` for inspection. See the
 
 ### Added
 
+- Vendored Maven reactors and Gradle builds, with committed repositories,
+  reversible wiring, repair, rollback, and VEX. Reactors use suffixed versions;
+  Gradle preserves coordinates and lockfiles, checks artifact hashes, and updates
+  existing verification metadata. `vendor --check` audits artifacts and wiring
+  offline; `--local-repo` checks Maven cache conflicts and `--maven-config=none`
+  selects the fallback file repository. Single-POM vendoring is unchanged.
 - `socket.yml` patch policy for paths, ecosystems, packages, severity, and per-run
   limits. `scan --package`, `--min-severity`, `--max-new-patches`, and
   `--no-socket-yml` support targeted and gradual rollout. Already-patched packages
 
@@ -102,6 +102,10 @@ The CLI supports npm, PyPI, Cargo, Go, RubyGems, Maven, Composer, NuGet, and Den
 Mode and package-manager support vary: Deno uses agent mode, for example. Check the
 [ecosystem support matrix](docs/ecosystems.md) before choosing a mode.
 
+Vendored Maven reactors and Gradle 6.8+ builds are supported. See
+[JVM vendoring](docs/design/maven-vendoring.md) for supported project shapes,
+cache behavior, and offline checks.
+
 ## Common commands
 
 ```sh
 
@@ -42,7 +42,7 @@ Rows are in `--help` order (v5.0): the hosted/vendored workflow (`scan` → `vex
 
 ## Global arguments
 
-Every subcommand accepts the same set of "global" flags via a single shared `GlobalArgs` struct that's `#[command(flatten)]`-ed into each per-command struct (`crates/socket-patch-cli/src/args.rs`). Subcommands that don't actually consume a given flag accept it silently — e.g. `list --global` parses fine and is a no-op. Every flag also has an environment-variable binding; precedence is **CLI arg > env var > default** — and for exactly three keys (`--api-token`, `--org`, `--api-url`) the JS socket-cli's persisted login sits between env var and default: **CLI arg > env var (canonical, then `SOCKET_CLI_*` alias) > socket-cli `config.json` > default**. See "Persisted configuration" under Environment variables.
+Every subcommand accepts the same set of "global" flags via a single shared `GlobalArgs` struct that's `#[command(flatten)]`-ed into each per-command struct (`crates/socket-patch-cli/src/args.rs`). Subcommands that don't actually consume a given flag accept it silently — e.g. `list --global` parses fine and is a no-op. For flags with an environment-variable binding, precedence is **CLI arg > env var > default** — and for exactly three keys (`--api-token`, `--org`, `--api-url`) the JS socket-cli's persisted login sits between env var and default: **CLI arg > env var (canonical, then `SOCKET_CLI_*` alias) > socket-cli `config.json` > default**. See "Persisted configuration" under Environment variables.
 
 | Long | Short | Env var | Default | Type | Semantic |
 |---|---|---|---|---|---|
@@ -55,6 +55,7 @@ Every subcommand accepts the same set of "global" flags via a single shared `Glo
 | `--ecosystems` | `-e` | `SOCKET_ECOSYSTEMS` | (all) | CSV → `Vec<String>` | Restrict to these ecosystems |
 | `--download-mode` | — | `SOCKET_DOWNLOAD_MODE` | **`diff`** | enum: `diff` \| `file` (`package` was removed and is rejected) | Patch artifact format |
 | `--vendor-source` | — | `SOCKET_VENDOR_SOURCE` | **`auto`** | enum: `auto` \| `service` \| `build` | How `vendor` acquires the installable artifact (see "Prebuilt vendor artifacts") |
+| `--maven-config` | — | — | (recorded choice, else `auto`) | enum: `auto` \| `none` | Maven reactor vendoring: write the repository tail (`auto`) or use only the fallback file repository (`none`). The choice persists in the vendor ledger. |
 | `--vendor-url` | — | `SOCKET_VENDOR_URL` | (active API/proxy base) | string | Base host for the vendoring-service package-reference request |
 | `--patch-server-url` | — | `SOCKET_PATCH_SERVER_URL` | (server-returned) | string | Override the host of the prebuilt-archive download URL (local-dev / testing) |
 | `--offline` | — | `SOCKET_OFFLINE` | `false` | bool | **Strict airgap on every command** — never contact the network |
@@ -87,6 +88,8 @@ Beyond the globals above, each subcommand defines a small set of local arguments
 | `apply` | `--check` | — | Read-only audit that the committed **Go** `replace`-redirects match the manifest (CI / GitHub-App auditing) — Go ONLY (cargo patches in place, so there is no redirect to audit). Lock-free, crawl-free, offline-safe; exits 0 in sync, 1 on drift. Vendored modules are excluded from the audit |
 | `vendor` | `--force` / `-f` | `SOCKET_FORCE` | Tolerate missing patch-target files in the stage + bypass the variant probe. A beforeHash mismatch no longer needs it: vendor staging auto-overwrites with the verified patched content (`vendor_content_mismatch_overwritten` warning) |
 | `vendor` | `--revert` | `SOCKET_VENDOR_REVERT` | Undo vendoring: restore recorded original lockfile fragments + remove `.socket/vendor/` artifacts. Works without a manifest. A package vendored over a hosted pin returns to its upstream registry entry, never to hosted (see "Takeover reconciliation") |
+| `vendor` | `--check` | — | Offline, read-only artifact and wiring audit; exits 1 on drift. Conflicts with `--revert`. |
+| `vendor` | `--local-repo <path>` | — | With `--check`, also inspect suffixed Maven jar/POM copies in this cache for conflicts. |
 | `apply`, `scan`, `vendor` | `--vex` | `SOCKET_VEX` | Generate an OpenVEX 0.2.0 document at this path on a successful run; see "embedded VEX" below |
 | `apply`, `scan`, `vendor` | `--vex-product`, `--vex-no-verify`, `--vex-doc-id`, `--vex-compact` | `SOCKET_VEX_PRODUCT`, `SOCKET_VEX_NO_VERIFY`, `SOCKET_VEX_DOC_ID`, `SOCKET_VEX_COMPACT` | Passthrough to the embedded VEX builder; mirror the standalone `vex` knobs. Inert unless `--vex` is set |
 | `scan` | positional `[PATHS]...` | — | (v5.0) Meaning depends on the mode. **Hosted / vendored** (bare `scan` included): each PATH, or directory glob (`apps/*`), is a project directory scanned on its own as if it were `--cwd`. **Agent** (and a mode-less `--prune`/`--global` report): path globs scoping DISCOVERY to packages installed under matching paths (`packages/foo`, `apps/**`). See "Path-scoped scans" below |
@@ -1722,3 +1725,24 @@ Every item in this document is locked in by at least one of:
 - **Async `run()` integration tests** in `tests/cli_parse_list.rs`, `tests/cli_parse_remove.rs` — exercise the no-network error paths and assert JSON shape via `serde_json::from_str::<Value>` + per-key assertions.
 
 If you add a new flag/subcommand/JSON key, add a test here that locks the new surface in the same PR.
+
+
+### Vendored JVM support (v5)
+
+Maven reactors and Gradle 6.8+ route to the JVM backend automatically. Ledger
+entries use ecosystem `jvm` with Maven PURLs. Revert, remove, rollback and repair
+share the v5 vendored backend; existing prototype wiring remains readable.
+See [the JVM design](../../docs/design/maven-vendoring.md) for supported shapes.
+
+`vendor --check` is an offline, read-only audit. Healthy entries emit `verified`
+with `vendor_check_ok`; drift emits `failed` with `vendor_check_failed`, a
+`partialFailure` envelope and exit 1. Missing ledger entries fail with
+`vendor_ledger_missing`. Offline upstream metadata is reported as the run warning
+`vendor_jvm_upstream_unverified`. The check never starts an API client or writes
+lock/recovery files. `--check` conflicts with `--revert`.
+
+`vendor --check --local-repo <path>` additionally checks existing suffixed Maven
+jar/POM copies for conflicting bytes. `--maven-config auto|none` is a global
+vendoring option so scan/get/repair receive it too; omission preserves the
+ledger's recorded choice. Switching existing auto-config wiring to `none`
+requires reverting it first. `none` cannot be combined with a repository ban.
@@ -176,6 +176,11 @@ pub struct GlobalArgs {
     )]
     pub vendor_source: String,
 
+    /// Vendored Maven: auto writes the repository tail; none uses only the file repository.
+    /// The choice is preserved on subsequent runs.
+    #[arg(help_heading = GLOBAL_OPTIONS, long, value_parser = ["auto", "none"])]
+    pub maven_config: Option<String>,
+
     /// Base URL for the patch vendoring service. Defaults to the active API base (`--api-url`) when
     /// authenticated or the proxy base (`--proxy-url`) otherwise. Override to
     /// point `vendor` at staging / local dev independently of `--api-url`.
@@ -507,6 +512,7 @@ impl GlobalArgs {
         use_public_proxy: bool,
     ) -> VendorServiceConfig {
         VendorServiceConfig {
+            maven_config: self.maven_config.as_deref().map(|v| v != "none"),
             source: VendorSource::parse(&self.vendor_source).unwrap_or_default(),
             client,
             use_public_proxy,
@@ -675,6 +681,7 @@ impl Default for GlobalArgs {
             ecosystems: None,
             download_mode: "diff".to_string(),
             vendor_source: "auto".to_string(),
+            maven_config: None,
             vendor_url: None,
             patch_server_url: None,
             offline: false,