diff --git a/.github/workflows/ci-maven.yaml b/.github/workflows/ci-maven.yaml
new file mode 100644
index 0000000000..5ffc8cae1b
--- /dev/null
+++ b/.github/workflows/ci-maven.yaml
@@ -0,0 +1,34 @@
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+name: ci-maven
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        java: [8, 11]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: ${{ matrix.java }}
+      - run: java -version
+
+      - name: Cache local Maven repository
+        uses: actions/cache@v2
+        with:
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            ${{ runner.os }}-maven-
+
+      - name: Unit Tests
+        run: |
+          mvn verify --batch-mode --no-transfer-progress
+
+      - name: Java Linter
+        run: mvn fmt:check
diff --git a/.gitignore b/.gitignore
index a484993351..913a2a8e6e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,6 @@
-# Bazel.
 bazel-*
 .gradle/
+target/
 
 # IDE
 .idea
diff --git a/DEVELOPMENT.md b/DEVELOPMENT.md
index 229f780447..856fea7d6e 100644
--- a/DEVELOPMENT.md
+++ b/DEVELOPMENT.md
@@ -92,12 +92,20 @@
     ```sh
     bazel run //:google_java_format_verification
     ```
+    or
+    ```sh
+    mvn fmt:check
+    ```
 
 -   Format files.
 
     ```sh
     bazel run //:google_java_format
     ```
+    or
+    ```sh
+    mvn fmt:format
+    ```
 
 ## Test Running
 
@@ -112,18 +120,38 @@
     ```sh
     bazel test //:units
     ```
+    or
+    ```sh
+    mvn test
+    ```
 
--   Run a single unit test like `JavaCodeGeneratorTest.java`
+-   Run a single unit test like `JavaCodeGeneratorTest.java`:
 
     ```sh
     bazel test //:unit_com_google_api_generator_engine_JavaCodeGeneratorTest
     ```
+    or
+    ```sh
+    mvn test -Dtest=JavaCodeGeneratorTest
+
+    mvn test "-Dtest=Basic*, !%regex[.*.Unstable.*], !%regex[.*.MyTest.class#one.*|two.*], %regex[#fast.*|slow.*]"
+    ```
+
+-   Update all unit test golden files:
 
--   Update unit test golden files, for example `JavaCodeGeneratorTest.java`:
+    ```sh
+    mvn test -DupdateUnitGoldens
+    ```
+
+-   Update a single unit test golden file, for example `JavaCodeGeneratorTest.java`:
 
     ```sh
     bazel run //:update_com_google_api_generator_engine_JavaCodeGeneratorTest
     ```
+    or
+    ```sh
+    mvn test -DupdateUnitGoldens -Dtest=JavaCodeGeneratorTest
+    ```
 
 -   Run a single integration test for API like `Redis`, it generates Java source
     code using the Java microgenerator and compares them with the goldens files
diff --git a/pom.xml b/pom.xml
new file mode 100644
index 0000000000..e7f28f51fe
--- /dev/null
+++ b/pom.xml
@@ -0,0 +1,328 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.google.api</groupId>
+  <artifactId>gapic-generator-java</artifactId>
+  <version>0.0.1-SNAPSHOT</version>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <!-- Should be in sync with repositories.bzl -->
+    <googleapis.commit>44d6bef0ca6db8bba3fb324c8186e694bcc4829c</googleapis.commit>
+  </properties>
+
+  <dependencyManagement>
+    <dependencies>
+      <dependency>
+        <groupId>com.google.cloud</groupId>
+        <artifactId>google-cloud-shared-dependencies</artifactId>
+        <version>2.7.0</version>
+        <type>pom</type>
+        <scope>import</scope>
+      </dependency>
+    </dependencies>
+  </dependencyManagement>
+
+  <build>
+    <extensions>
+      <extension>
+        <groupId>kr.motd.maven</groupId>
+        <artifactId>os-maven-plugin</artifactId>
+        <version>1.7.0</version>
+      </extension>
+    </extensions>
+
+    <plugins>
+      <plugin>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>3.8.1</version>
+        <configuration>
+          <source>8</source>
+          <target>8</target>
+          <annotationProcessorPaths>
+            <path>
+              <groupId>com.google.auto.value</groupId>
+              <artifactId>auto-value</artifactId>
+              <version>1.7.2</version>
+            </path>
+          </annotationProcessorPaths>
+        </configuration>
+      </plugin>
+
+      <plugin>
+        <groupId>com.coveo</groupId>
+        <artifactId>fmt-maven-plugin</artifactId>
+        <version>2.9.1</version>
+      </plugin>
+
+      <plugin>
+        <groupId>com.googlecode.maven-download-plugin</groupId>
+        <artifactId>download-maven-plugin</artifactId>
+        <version>1.6.8</version>
+        <executions>
+          <execution>
+            <id>download-metadata-proto</id>
+            <phase>generate-sources</phase>
+            <goals>
+              <goal>wget</goal>
+            </goals>
+            <configuration>
+              <url>https://raw.githubusercontent.com/googleapis/googleapis/${googleapis.commit}/gapic/metadata/gapic_metadata.proto</url>
+              <outputDirectory>${project.build.directory}/generated-sources/proto/</outputDirectory>
+            </configuration>
+          </execution>
+          <execution>
+            <id>download-common-resources-proto</id>
+            <phase>generate-test-sources</phase>
+            <goals>
+              <goal>wget</goal>
+            </goals>
+            <configuration>
+              <url>https://raw.githubusercontent.com/googleapis/googleapis/${googleapis.commit}/google/cloud/common_resources.proto</url>
+              <outputDirectory>${project.build.directory}/generated-test-sources/proto/</outputDirectory>
+            </configuration>
+          </execution>
+          <execution>
+            <id>download-pubsub-proto</id>
+            <phase>generate-test-sources</phase>
+            <goals>
+              <goal>wget</goal>
+            </goals>
+            <configuration>
+              <url>https://raw.githubusercontent.com/googleapis/googleapis/${googleapis.commit}/google/pubsub/v1/pubsub.proto</url>
+              <outputDirectory>${project.build.directory}/generated-test-sources/proto/</outputDirectory>
+            </configuration>
+          </execution>
+          <execution>
+            <id>download-schema-proto</id>
+            <phase>generate-test-sources</phase>
+            <goals>
+              <goal>wget</goal>
+            </goals>
+            <configuration>
+              <url>https://raw.githubusercontent.com/googleapis/googleapis/${googleapis.commit}/google/pubsub/v1/schema.proto</url>
+              <outputDirectory>${project.build.directory}/generated-test-sources/proto/google/pubsub/v1/</outputDirectory>
+            </configuration>
+          </execution>
+          <execution>
+            <id>download-logging-proto</id>
+            <phase>generate-test-sources</phase>
+            <goals>
+              <goal>wget</goal>
+            </goals>
+            <configuration>
+              <url>https://raw.githubusercontent.com/googleapis/googleapis/${googleapis.commit}/google/logging/v2/logging.proto</url>
+              <outputDirectory>${project.build.directory}/generated-test-sources/proto/</outputDirectory>
+            </configuration>
+          </execution>
+          <execution>
+            <id>download-log-entry-proto</id>
+            <phase>generate-test-sources</phase>
+            <goals>
+              <goal>wget</goal>
+            </goals>
+            <configuration>
+              <url>https://raw.githubusercontent.com/googleapis/googleapis/${googleapis.commit}/google/logging/v2/log_entry.proto</url>
+              <outputDirectory>${project.build.directory}/generated-test-sources/proto/google/logging/v2/</outputDirectory>
+            </configuration>
+          </execution>
+          <execution>
+            <id>download-logging-config-proto</id>
+            <phase>generate-test-sources</phase>
+            <goals>
+              <goal>wget</goal>
+            </goals>
+            <configuration>
+              <url>https://raw.githubusercontent.com/googleapis/googleapis/${googleapis.commit}/google/logging/v2/logging_config.proto</url>
+              <outputDirectory>${project.build.directory}/generated-test-sources/proto/google/logging/v2/</outputDirectory>
+            </configuration>
+          </execution>
+          <execution>
+            <id>download-logging-metrics-proto</id>
+            <phase>generate-test-sources</phase>
+            <goals>
+              <goal>wget</goal>
+            </goals>
+            <configuration>
+              <url>https://raw.githubusercontent.com/googleapis/googleapis/${googleapis.commit}/google/logging/v2/logging_metrics.proto</url>
+              <outputDirectory>${project.build.directory}/generated-test-sources/proto/google/logging/v2/</outputDirectory>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+
+      <plugin>
+        <groupId>org.xolstice.maven.plugins</groupId>
+        <artifactId>protobuf-maven-plugin</artifactId>
+        <version>0.6.1</version>
+        <configuration>
+          <protocArtifact>com.google.protobuf:protoc:3.19.4:exe:${os.detected.classifier}</protocArtifact>
+        </configuration>
+        <executions>
+          <execution>
+            <id>compile-protos</id>
+            <goals>
+              <goal>compile</goal>
+            </goals>
+          </execution>
+          <execution>
+            <id>compile-downloaded-protos</id>
+            <goals>
+              <goal>compile</goal>
+            </goals>
+            <configuration>
+              <protoSourceRoot>${project.build.directory}/generated-sources/proto/</protoSourceRoot>
+              <clearOutputDirectory>false</clearOutputDirectory>
+            </configuration>
+          </execution>
+          <execution>
+            <id>compile-test-protos</id>
+            <goals>
+              <goal>test-compile</goal>
+            </goals>
+            <configuration>
+              <writeDescriptorSet>true</writeDescriptorSet>
+              <includeSourceInfoInDescriptorSet>true</includeSourceInfoInDescriptorSet>
+              <includeDependenciesInDescriptorSet>true</includeDependenciesInDescriptorSet>
+              <descriptorSetFileName>test-proto.descriptorset</descriptorSetFileName>
+            </configuration>
+          </execution>
+          <execution>
+            <id>compile-downloaded-test-protos</id>
+            <goals>
+              <goal>test-compile</goal>
+            </goals>
+            <configuration>
+              <protoTestSourceRoot>${project.build.directory}/generated-test-sources/proto/</protoTestSourceRoot>
+              <clearOutputDirectory>false</clearOutputDirectory>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-surefire-plugin</artifactId>
+        <version>3.0.0-M5</version>
+        <configuration>
+          <additionalClasspathElements>
+            <additionalClasspathElement>${project.build.directory}/generated-test-resources/protobuf/descriptor-sets/</additionalClasspathElement>
+          </additionalClasspathElements>
+        </configuration>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-shade-plugin</artifactId>
+        <version>3.2.4</version>
+        <executions>
+          <execution>
+            <phase>package</phase>
+            <goals>
+              <goal>shade</goal>
+            </goals>
+            <configuration>
+              <createDependencyReducedPom>false</createDependencyReducedPom>
+              <filters>
+                <filter>
+                  <artifact>*:*</artifact>
+                  <excludes>
+                    <exclude>META-INF/*.SF</exclude>
+                    <exclude>META-INF/*.DSA</exclude>
+                    <exclude>META-INF/*.RSA</exclude>
+                  </excludes>
+                </filter>
+              </filters>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+
+  <dependencies>
+    <dependency>
+      <groupId>com.google.guava</groupId>
+      <artifactId>guava</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>com.google.api</groupId>
+      <artifactId>gax</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>com.google.api</groupId>
+      <artifactId>gax</artifactId>
+      <classifier>testlib</classifier>
+    </dependency>
+    <dependency>
+      <groupId>com.google.api</groupId>
+      <artifactId>gax-grpc</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>com.google.api</groupId>
+      <artifactId>gax-grpc</artifactId>
+      <classifier>testlib</classifier>
+    </dependency>
+    <dependency>
+      <groupId>com.google.api</groupId>
+      <artifactId>gax-httpjson</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>com.google.api</groupId>
+      <artifactId>gax-httpjson</artifactId>
+      <classifier>testlib</classifier>
+    </dependency>
+    <dependency>
+      <groupId>com.google.auto.value</groupId>
+      <artifactId>auto-value-annotations</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>com.google.protobuf</groupId>
+      <artifactId>protobuf-java-util</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>io.grpc</groupId>
+      <artifactId>grpc-stub</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>io.grpc</groupId>
+      <artifactId>grpc-protobuf</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.yaml</groupId>
+      <artifactId>snakeyaml</artifactId>
+      <version>1.26</version>
+    </dependency>
+    <dependency>
+      <groupId>com.google.googlejavaformat</groupId>
+      <artifactId>google-java-format</artifactId>
+      <version>1.7</version>
+    </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.13.1</version>
+    </dependency>
+
+    <!--
+      TODO: remove when dropping Java 8.
+      https://github.com/googleapis/gapic-generator-java/issues/888
+    -->
+    <dependency>
+      <groupId>javax.annotation</groupId>
+      <artifactId>javax.annotation-api</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>com.google.truth</groupId>
+      <artifactId>truth</artifactId>
+      <version>1.1.2</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>io.github.java-diff-utils</groupId>
+      <artifactId>java-diff-utils</artifactId>
+      <version>4.0</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+</project>