Migrate build infrastructure from Gradle to Maven

- Add pom.xml with all dependencies, compiler settings (Java 1.8, -parameters),
  jar manifest (Automatic-Module-Name), javadoc, source, and GPG signing profile
- Add Maven wrapper (mvnw/mvnw.cmd) replacing Gradle wrapper
- Rename gradle-build.yml to maven-build.yml with Maven commands and cache
- Update codeql-analysis.yml to use mvnw compile
- Update ADO ci-build.yml with Maven install/deploy and settings.xml auth
- Update ADO daily-ci-build.yml with Maven@4 task and network-isolated mirror
- Update dependabot.yml: maven ecosystem for root, gradle kept for /android
- Update .gitignore: swap Gradle entries for Maven
- Update release-please-config.json: XML xpath updater for pom.xml version
- Inline dependencies into android/build.gradle (remove shared gradle/dependencies.gradle)
- Remove all root Gradle files and java-8/ sub-project

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

Author: ramsessanchez

.azure-pipelines/ci-build.yml

@@ -60,29 +60,61 @@ extends:
                   Copy-Item $(downloadLocalProperties.secureFilePath) local.properties -Verbose
                 displayName: Copy secring and 'local.properties'
 
-              - script: ./gradlew --no-daemon publishToMavenLocal -PmavenCentralPublishingEnabled=true -PmavenCentralSnapshotArtifactSuffix=""
+              - pwsh: |
+                  $props = Get-Content local.properties -Raw
+                  $keyId = ($props | Select-String -Pattern 'signing\.keyId=(.+)').Matches.Groups[1].Value
+                  $keyRingFile = ($props | Select-String -Pattern 'signing\.secretKeyRingFile=(.+)').Matches.Groups[1].Value
+                  $keyPassword = ($props | Select-String -Pattern 'signing\.password=(.+)').Matches.Groups[1].Value
+
+                  $settingsXml = @"
+                  <settings>
+                    <servers>
+                      <server>
+                        <id>GraphDeveloperExperiencesPublic</id>
+                        <username>microsoftgraph</username>
+                        <password>${{ variables.ARTIFACTS_PAT }}</password>
+                      </server>
+                    </servers>
+                    <profiles>
+                      <profile>
+                        <id>signing</id>
+                        <properties>
+                          <gpg.keyname>$keyId</gpg.keyname>
+                          <gpg.passphrase>$keyPassword</gpg.passphrase>
+                        </properties>
+                      </profile>
+                    </profiles>
+                  </settings>
+                  "@
+                  $settingsDir = Join-Path $HOME ".m2"
+                  New-Item -ItemType Directory -Path $settingsDir -Force | Out-Null
+                  $settingsXml | Set-Content (Join-Path $settingsDir "settings.xml") -Encoding UTF8
+                displayName: Configure Maven settings
+
+              - script: ./mvnw install -Psigning --no-transfer-progress -DmavenCentralSnapshotSuffix=""
                 displayName: Publish to local Maven for verification
                 condition: contains(variables['build.sourceBranch'], 'refs/tags/v')
 
-              - script: ./gradlew --no-daemon publishToMavenLocal -PmavenCentralPublishingEnabled=true
+              - script: ./mvnw install -Psigning --no-transfer-progress
                 displayName: Publish to local Maven for verification
                 condition: not(contains(variables['build.sourceBranch'], 'refs/tags/v'))
 
-              - script: ./gradlew --no-daemon publishMavenPublicationToADORepository -PmavenCentralPublishingEnabled=true -PmavenCentralSnapshotArtifactSuffix=""
-                displayName: Publish to local Maven ADO for ESRP
+              - script: ./mvnw deploy -Psigning --no-transfer-progress -DmavenCentralSnapshotSuffix="" -DaltDeploymentRepository=ADO::default::file://$(Build.SourcesDirectory)/target/staging-deploy
+                displayName: Stage artifacts for ESRP
                 condition: contains(variables['build.sourceBranch'], 'refs/tags/v')
 
-              - script: ./gradlew --no-daemon publishMavenPublicationToADORepository -PmavenCentralPublishingEnabled=true
-                displayName: Publish to local Maven ADO for ESRP
+              - script: ./mvnw deploy -Psigning --no-transfer-progress -DaltDeploymentRepository=ADO::default::file://$(Build.SourcesDirectory)/target/staging-deploy
+                displayName: Stage artifacts for ESRP
                 condition: not(contains(variables['build.sourceBranch'], 'refs/tags/v'))
 
               - pwsh: |
-                  $contents = Get-Content gradle.properties -Raw
-                  $major = $contents | Select-String -Pattern 'mavenMajorVersion\s*=\s*([0-9]+)' | ForEach-Object { $_.Matches.Groups[1].Value }
-                  $minor = $contents | Select-String -Pattern 'mavenMinorVersion\s*=\s*([0-9]+)' | ForEach-Object { $_.Matches.Groups[1].Value }
-                  $patch = $contents | Select-String -Pattern 'mavenPatchVersion\s*=\s*([0-9]+)' | ForEach-Object { $_.Matches.Groups[1].Value }
+                  $pomXml = [xml](Get-Content pom.xml)
+                  $version = $pomXml.project.version
                   $snapshot_suffix = if ($Env:BRANCH_NAME.StartsWith('refs/tags/v')) { '' } else { '-SNAPSHOT' }
-                  $version = "$major.$minor.$patch$snapshot_suffix"
+                  # If version already contains -SNAPSHOT and we're on a tag, strip it
+                  if ($Env:BRANCH_NAME.StartsWith('refs/tags/v')) {
+                    $version = $version -replace '-SNAPSHOT$', ''
+                  }
                   echo "Current version is $version"
                   echo "##vso[task.setvariable variable=PACKAGE_VERSION;]$version"
                 displayName: Get current version
@@ -95,7 +127,7 @@ extends:
                 displayName: Inspect contents of local Maven cache
 
               - pwsh: |
-                  $packageFullPath = Join-Path -Path "./" -ChildPath "build/publishing-repository/com/microsoft/graph/microsoft-graph" -AdditionalChildPath "$(PACKAGE_VERSION)"
+                  $packageFullPath = Join-Path -Path "./target/staging-deploy" -ChildPath "com/microsoft/graph/microsoft-graph" -AdditionalChildPath "$(PACKAGE_VERSION)"
                   echo "Package full path: $packageFullPath"
                   echo "##vso[task.setvariable variable=PACKAGE_PATH;]$packageFullPath"
                 displayName: Get the package full path

.azure-pipelines/daily-ci-build.yml

@@ -43,21 +43,44 @@ extends:
               - checkout: self
                 submodules: recursive
 
-              - script: |
-                  sed -i "/mavenCentral()/d" build.gradle
-                  sed -i "/gradlePluginPortal()/d" settings.gradle
-                  sed -i "/mavenCentral()/d" settings.gradle
-                displayName: Strip plugins and public repos for network-isolated build
+              - task: JavaToolInstaller@1
+                inputs:
+                  versionSpec: '17'
+                  jdkArchitectureOption: 'x64'
+                  jdkSourceOption: 'PreInstalled'
+
+              - pwsh: |
+                  $settingsXml = @"
+                  <settings>
+                    <servers>
+                      <server>
+                        <id>GraphDeveloperExperiencesPublic</id>
+                        <username>microsoftgraph</username>
+                        <password>$(ARTIFACTS_PAT)</password>
+                      </server>
+                    </servers>
+                    <mirrors>
+                      <mirror>
+                        <id>GraphDeveloperExperiencesPublic</id>
+                        <mirrorOf>central</mirrorOf>
+                        <url>https://microsoftgraph.pkgs.visualstudio.com/0985d294-5762-4bc2-a565-161ef349ca3e/_packaging/GraphDeveloperExperiences_Public/maven/v1</url>
+                      </mirror>
+                    </mirrors>
+                  </settings>
+                  "@
+                  $settingsDir = Join-Path $HOME ".m2"
+                  New-Item -ItemType Directory -Path $settingsDir -Force | Out-Null
+                  $settingsXml | Set-Content (Join-Path $settingsDir "settings.xml") -Encoding UTF8
+                displayName: Configure Maven settings for network-isolated build
 
-              - task: Gradle@4
+              - task: Maven@4
                 displayName: Build and Test SDK
                 inputs:
-                  gradleWrapperFile: 'gradlew'
-                  workingDirectory: '$(Build.SourcesDirectory)'
-                  tasks: 'assemble test'
-                  options: '--no-daemon -PGraphDeveloperExperiencesPublicPassword=$(ARTIFACTS_PAT)'
+                  mavenPomFile: 'pom.xml'
+                  goals: 'verify'
+                  options: '--no-transfer-progress'
                   publishJUnitResults: true
-                  testResultsFiles: '**/TEST-*.xml'
+                  testResultsFiles: '**/surefire-reports/TEST-*.xml'
                   javaHomeOption: 'JDKVersion'
                   jdkVersionOption: '1.17'
                   jdkArchitectureOption: 'x64'

.github/dependabot.yml

@@ -1,10 +1,7 @@
 version: 2
 updates:
-- package-ecosystem: gradle
-  directories:
-    - "/"
-    - "/java-8"
-    - "/android"
+- package-ecosystem: maven
+  directory: "/"
   schedule:
     interval: daily
     time: "09:00" # 9am UTC
@@ -16,12 +13,14 @@ updates:
     microsoft-graph:
       patterns:
         - "*microsoft-graph*"
-    junit-dependencies:
-      patterns:
-        - "*junit*"
-    open-telemetry:
-      patterns:
-        - "*opentelemetry*"
+- package-ecosystem: gradle
+  directories:
+    - "/android"
+  schedule:
+    interval: daily
+    time: "09:00" # 9am UTC
+  open-pull-requests-limit: 10
+  groups:
     android-build-tools:
       patterns:
         - "*android*"

.github/workflows/codeql-analysis.yml

@@ -49,7 +49,7 @@ jobs:
         with:
           java-version: 21
           distribution: 'temurin'
-          cache: gradle
+          cache: maven
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL
@@ -75,10 +75,8 @@ jobs:
       #   If the Autobuild fails above, remove it and uncomment the following three lines.
       #   modify them (or add more) to build your code if your project, please refer to the EXAMPLE below for guidance.
 
-      - name: Grant execute permission for gradlew
-        run: chmod +x gradlew
-      - name: Build with Gradle
-        run: ./gradlew --no-build-cache build
+      - name: Build with Maven
+        run: ./mvnw compile --no-transfer-progress -DskipTests
 
       - name: Perform CodeQL Analysis
         uses: github/codeql-action/analyze@v4

.github/workflows/gradle-build.yml .github/workflows/maven-build.yml.github/workflows/gradle-build.yml renamed to .github/workflows/maven-build.yml

@@ -1,4 +1,4 @@
-name: Gradle Build and Compare Package
+name: Maven Build
 
 on:
   push:
@@ -17,36 +17,29 @@ jobs:
         with:
           java-version: 21
           distribution: 'temurin'
-          cache: gradle
+          cache: maven
       - name: Move generated sources to correct package
         run: .\scripts\copyFilesOnBuild.ps1 -inputPath '.\src\main\java\com\microsoft\graph\generated'
         shell: pwsh
-      - name: Grant Execute permission for gradlew
-        run: chmod +x gradlew
-      - name: Build with Gradle
-        run: ./gradlew build
+      - name: Build with Maven
+        run: ./mvnw verify --no-transfer-progress
       - name: Upload Unit Test Results
         if: ${{ always() }}
         uses: actions/upload-artifact@v7
         with:
           name: UnitTests
           path: |
-            build/reports/tests/test/**
-            build/test-results/**
+            target/surefire-reports/**
       - name: Upload a Build Artifact
         uses: actions/upload-artifact@v7
         with:
           name: drop
           path: |
-            **/libs/*
-            build/generated-pom.xml
-            build/generated-pom.xml.asc
-            build.gradle
-            gradlew
-            gradlew.bat
-            settings.gradle
-            gradle.properties
-            **/gradle/**
+            target/*.jar
+            pom.xml
+            mvnw
+            mvnw.cmd
+            .mvn/**
             scripts/**
 
   build-java-8:
@@ -58,15 +51,12 @@ jobs:
         with:
           java-version: 8
           distribution: 'temurin'
-          cache: gradle
+          cache: maven
       - name: Move generated sources to correct package
         run: .\scripts\copyFilesOnBuild.ps1 -inputPath '.\src\main\java\com\microsoft\graph\generated'
         shell: pwsh
-      - name: Grant Execute permission for gradlew
-        run: chmod +x gradlew
       - name: Build with Java 8
-        working-directory: ./java-8
-        run: .././gradlew build
+        run: ./mvnw compile --no-transfer-progress
 
   build:
     needs: [build-java-latest, build-java-8]
@@ -81,19 +71,3 @@ jobs:
             exit 1
           fi
 
-  dependency-submission:
-    runs-on: ubuntu-latest
-    if: github.event_name == 'push'
-    permissions:
-      contents: write
-    steps:
-      - uses: actions/checkout@v6
-      - name: Set up JDK
-        uses: actions/setup-java@v5
-        with:
-          java-version: 21
-          distribution: 'temurin'
-          cache: gradle
-      - name: Generate and submit dependency graph
-        uses: gradle/actions/dependency-submission@v6
-

.gitignore

@@ -20,16 +20,17 @@
 
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
-/.gradle/
-/build/
-/bin/
+
+# Maven
+/target/
+
+# Maven wrapper
+!.mvn/wrapper/maven-wrapper.jar
 
 #Eclipse
 .project
 .classpath
 .settings
 
-# Maven
-/target/
 local.properties
 .idea

.mvn/wrapper/maven-wrapper.jar

@@ -0,0 +1,2 @@
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.9/apache-maven-3.9.9-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.3.2/maven-wrapper-3.3.2.jar

.mvn/wrapper/maven-wrapper.properties

@@ -71,4 +71,17 @@ android {
 	}
 }
 
-apply from: "../gradle/dependencies.gradle"
+
+dependencies {
+    implementation 'com.squareup.okhttp3:okhttp:4.12.0'
+    implementation 'jakarta.annotation:jakarta.annotation-api:2.1.1'
+
+    api 'com.microsoft.graph:microsoft-graph-core:3.6.6'
+
+    implementation 'com.microsoft.kiota:microsoft-kiota-authentication-azure:1.9.2'
+    implementation 'com.microsoft.kiota:microsoft-kiota-http-okHttp:1.9.2'
+    implementation 'com.microsoft.kiota:microsoft-kiota-serialization-json:1.9.2'
+    implementation 'com.microsoft.kiota:microsoft-kiota-serialization-text:1.9.2'
+    implementation 'com.microsoft.kiota:microsoft-kiota-serialization-form:1.9.2'
+    implementation 'com.microsoft.kiota:microsoft-kiota-serialization-multipart:1.9.2'
+}