chore: set up fully working Maven pom.xml (#937)

* chore: set up fully working pom.xml
* chore: update DEVELOPMENT.md

.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

.gitignore

@@ -1,6 +1,6 @@
-# Bazel.
 bazel-*
 .gradle/
+target/
 
 # IDE
 .idea

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