Add spotless maven plugin

* with rules that more or less match current style

Author: anthonydahanne

.github/workflows/maven.yml

@@ -1,13 +1,19 @@
 name: Java CI
 
-on: [push]
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
 
 jobs:
   build:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [ 8, 11, 17, 21 ]
+        java: [ 8, 11 ]
     name: Java ${{ matrix.java }} build
     steps:
       - uses: actions/checkout@v4
@@ -26,5 +32,8 @@ jobs:
           key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
           restore-keys: ${{ runner.os }}-m2
       - name: Build with Maven
-        run: ./mvnw clean install -Dgpg.skip
+        run: ./mvnw clean package -Dgpg.skip
+      - if: ${{ matrix.java != 8 }}
+        name: Check style with Spotless
+        run: ./mvnw spotless:check
 

pom.xml

@@ -73,6 +73,7 @@
         <wire.version>3.7.1</wire.version>
         <wire.plugin.version>3.0.2</wire.plugin.version>
         <wire.suffix></wire.suffix>
+        <spotless.version>2.41.1</spotless.version>
     </properties>
 
     <dependencyManagement>
@@ -266,6 +267,25 @@
                     </execution>
                 </executions>
             </plugin>
+            <plugin>
+                <groupId>com.diffplug.spotless</groupId>
+                <artifactId>spotless-maven-plugin</artifactId>
+                <version>${spotless.version}</version>
+                <configuration>
+                    <java>
+                        <excludes>
+                            <exclude>**/_*.java</exclude>
+                        </excludes>
+                        <googleJavaFormat>
+                            <version>1.19.1</version>
+                            <style>AOSP</style>
+                            <reflowLongStrings>true</reflowLongStrings>
+                            <formatJavadoc>false</formatJavadoc>
+                        </googleJavaFormat>
+                        <removeUnusedImports />
+                    </java>
+                </configuration>
+            </plugin>
         </plugins>
     </build>