Use the Maven wrapper in all GitHub workflows

The ubuntu-24.04 runner image now ships Maven 3.10, where the staging
metadata is written as maven-metadata-local.xml. central-publishing
0.7.0 only removes maven-metadata-central-staging.xml before bundling,
so the leftover files end up in the bundle and Central rejects it
("Bundle has content that does NOT have a .pom file").

Use ./mvnw everywhere, so CI runs the Maven version pinned in
maven-wrapper.properties instead of whatever the runner image ships.

Signed-off-by: Daniel Garnier-Moiroux <git@garnier.wf>

Author: Kehrlann

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
           cache: 'maven'
 
       - name: Build
-        run: mvn verify
+        run: ./mvnw verify
 
   jackson2-tests:
     name: Jackson 2 Integration Tests
@@ -37,4 +37,4 @@ jobs:
           cache: 'maven'
 
       - name: Jackson 2 Integration Tests
-        run: mvn -pl mcp-test -am -Pjackson2 test
+        run: ./mvnw -pl mcp-test -am -Pjackson2 test

.github/workflows/conformance.yml

@@ -22,8 +22,8 @@ jobs:
 
       - name: Build and start server
         run: |
-          mvn clean install -DskipTests
-          mvn exec:java -pl conformance-tests/server-servlet -Dexec.mainClass="io.modelcontextprotocol.conformance.server.ConformanceServlet" &
+          ./mvnw clean install -DskipTests
+          ./mvnw exec:java -pl conformance-tests/server-servlet -Dexec.mainClass="io.modelcontextprotocol.conformance.server.ConformanceServlet" &
           timeout 30 bash -c 'until curl -s http://localhost:8080/mcp > /dev/null 2>&1; do sleep 0.5; done'
 
       - name: Run conformance tests
@@ -51,7 +51,7 @@ jobs:
           cache: 'maven'
 
       - name: Build client
-        run: mvn clean install -DskipTests
+        run: ./mvnw clean install -DskipTests
 
       - name: Run conformance test
         uses: modelcontextprotocol/conformance@v0.1.16
@@ -92,7 +92,7 @@ jobs:
           cache: 'maven'
 
       - name: Build client
-        run: mvn clean install -DskipTests
+        run: ./mvnw clean install -DskipTests
 
       - name: Run conformance test
         uses: modelcontextprotocol/conformance@v0.1.16

.github/workflows/docs.yml

@@ -37,7 +37,7 @@ jobs:
       - name: Deploy docs (push to main)
         if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
         run: |
-          PROJECT_VERSION=$(mvn help:evaluate -Dexpression=project.version --quiet -DforceStdout)
+          PROJECT_VERSION=$(./mvnw help:evaluate -Dexpression=project.version --quiet -DforceStdout)
           if [[ "${PROJECT_VERSION}" == *-SNAPSHOT ]]; then
             ALIAS="latest-snapshot"
           else

.github/workflows/maven-central-release.yml

@@ -29,15 +29,17 @@ jobs:
       # Deploy runs the integration tests, but only with Jackson 3
       # We run Jackson 2 IT manually
       - name: Jackson 2 Integration Tests
-        run: mvn -pl mcp-test -am -Pjackson2 test
+        run: ./mvnw -pl mcp-test -am -Pjackson2 test
 
       # Deploy runs all previous maven goals, including test and verify
       # Conformance tests are not published, and they break javadoc:aggregate: its forked
       # compile lifecycle never produces mcp classes (compiled at prepare-package), so their
       # dependency on mcp falls back to Maven Central, where the release does not exist yet.
+      # Use the wrapper (Maven 3.9.x): with Maven 3.10, central-publishing 0.7.0 leaves
+      # maven-metadata-local.xml files in the bundle, and Central rejects it.
       - name: Publish to Maven Central
         run: |
-          mvn --batch-mode \
+          ./mvnw --batch-mode \
             -Prelease \
             -Pjavadoc \
             -pl '!conformance-tests,!conformance-tests/client-jdk-http-client,!conformance-tests/client-spring-http-client,!conformance-tests/server-servlet' \

.github/workflows/publish-snapshot.yml

@@ -30,23 +30,23 @@ jobs:
           node-version: '20'
 
       - name: Generate Java docs
-        run: mvn -Pjavadoc -B javadoc:aggregate
+        run: ./mvnw -Pjavadoc -B javadoc:aggregate
 
       - name: Jackson 2 Integration Tests
-        run: mvn -pl mcp-test -am -Pjackson2 test
+        run: ./mvnw -pl mcp-test -am -Pjackson2 test
 
       - name: Build with Maven and deploy to Sonatype snapshot repository
         env:
           MAVEN_USERNAME: ${{ secrets.OSSRH_USERNAME }}
           MAVEN_PASSWORD: ${{ secrets.OSSRH_TOKEN }}
           MAVEN_GPG_PASSPHRASE: ${{ secrets.SIGNING_PASSPHRASE }}
         run: |
-          mvn \
+          ./mvnw \
             -Pjavadoc \
             -Prelease \
             --batch-mode \
             --update-snapshots deploy \
             -Dmaven.repository.credentialScope=id
 
       - name: Capture project version
-        run: echo PROJECT_VERSION=$(mvn help:evaluate -Dexpression=project.version --quiet -DforceStdout) >> $GITHUB_ENV
+        run: echo PROJECT_VERSION=$(./mvnw help:evaluate -Dexpression=project.version --quiet -DforceStdout) >> $GITHUB_ENV