Checkstyle with checkstyle 9.3

build.gradle

@@ -3,6 +3,7 @@ plugins {
     id "maven-publish"
     id "signing"
     id "org.embulk.embulk-plugins" version "0.7.0"
+    id "checkstyle"
 }
 repositories {
     mavenCentral()
@@ -168,3 +169,13 @@ test {
         outputs.upToDateWhen { false }
     }
 }
+
+checkstyle {
+    toolVersion = libs.versions.checkstyle.get()
+    configFile = file("${rootProject.projectDir}/config/checkstyle/checkstyle.xml")
+    configProperties = [
+            "org.checkstyle.google.suppressionfilter.config": file("${rootProject.projectDir}/config/checkstyle/checkstyle-suppressions.xml"),
+    ]
+    ignoreFailures = false
+    maxWarnings = 0
+}

config/checkstyle/README.md

@@ -0,0 +1,11 @@
+Checkstyle for the Embulk project
+==================================
+
+* google_check.xml: Downloaded from: https://github.com/checkstyle/checkstyle/blob/checkstyle-9.3/src/main/resources/google_checks.xml
+     * Commit: 5c1903792f8432243cc8ae5cd79a03a004d3c09c
+* checkstyle.xml: Customized from google_check.xml.
+    * To enable suppressions through checkstyle-suppressions.xml.
+    * To enable suppressions with @SuppressWarnings.
+    * To indent with 4-column spaces.
+    * To limit columns to 180 characters.
+    * To reject unused imports.

config/checkstyle/checkstyle-suppressions.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0"?>
+
+<!DOCTYPE suppressions PUBLIC
+    "-//Puppy Crawl//DTD Suppressions 1.2//EN"
+    "http://checkstyle.sourceforge.net/dtds/suppressions_1_2.dtd">
+
+<suppressions>
+  <suppress checks="JavadocMethod" files=".*"/>
+  <suppress checks="JavadocParagraph" files=".*"/>
+  <suppress checks="JavadocTagContinuationIndentation" files=".*"/>
+  <suppress checks="MissingJavadocType" files=".*"/>
+  <suppress checks="SingleLineJavadoc" files=".*"/>
+  <suppress checks="SummaryJavadoc" files=".*"/>
+</suppressions>