Add checkstyle config

.github/workflows/gradle-test.yml

@@ -23,6 +23,9 @@ jobs:
         java-version: '17'
         distribution: corretto
 
+    - name: Run checkstyle
+      run: ./gradlew checkstyleMain
+
     - name: Run Gradle test
       run: ./gradlew test -i
 

build.gradle

@@ -1,5 +1,9 @@
+import com.vanniktech.maven.publish.SonatypeHost
+
 plugins {
+    id 'checkstyle'
     id 'java'
+
     // this is a hopefully temporary plugin until maven central can add official gradle support
     id 'com.vanniktech.maven.publish' version '0.29.0'
 }
@@ -47,7 +51,7 @@ dependencies {
 }
 
 mavenPublishing {
-    publishToMavenCentral(com.vanniktech.maven.publish.SonatypeHost.CENTRAL_PORTAL)
+    publishToMavenCentral(SonatypeHost.CENTRAL_PORTAL)
     signAllPublications()
 
     coordinates(project.group, project.name, project.version)
@@ -88,13 +92,13 @@ mavenPublishing {
 
 // tasks
 
-task printVersion {
+tasks.register('printVersion') {
     doLast {
         println project.version
     }
 }
 
-task writeProps(type: WriteProperties) {
+tasks.register('writeProps', WriteProperties) {
     destinationFile = file("src/main/resources/version.properties")
     encoding = 'UTF-8'
     property('version', project.version)
@@ -109,5 +113,17 @@ tasks.register('packageJar', Zip) {
     }
 }
 
+checkstyle {
+    toolVersion = '10.19.0'  // Latest Checkstyle version at the time of writing
+    ignoreFailures = false
+}
+
+tasks.withType(Checkstyle).configureEach {
+    reports {
+        xml.required = false
+        html.required = true
+    }
+}
+
 processResources.dependsOn(writeProps)
 sourcesJar.dependsOn(writeProps)