[Backport 2.x] [spotless] Removes Checkstyle in favor of spotless

.github/workflows/sql-test-and-build-workflow.yml

@@ -11,7 +11,7 @@ on:
       - '!sql-jdbc/**'
       - '**gradle*'
       - '**lombok*'
-      - '**checkstyle*'
+      - '**spotless*'
       - 'integ-test/**'
       - '**/*.jar'
       - '**/*.pom'

DEVELOPER_GUIDE.rst

@@ -127,7 +127,7 @@ The plugin codebase is in standard layout of Gradle project::
    ├── THIRD-PARTY
    ├── build.gradle
    ├── config
-   │   └── checkstyle
+   │   └── spotless
    ├── docs
    │   ├── attributions.md
    │   ├── category.json
@@ -170,7 +170,7 @@ Here are sub-folders (Gradle modules) for plugin source code:
 Here are other files and sub-folders that you are likely to touch:
 
 - ``build.gradle``: Gradle build script.
-- ``config``: only Checkstyle configuration files for now.
+- ``config``: only Spotless configuration files for now.
 - ``docs``: documentation for developers and reference manual for users.
 - ``doc-test``: code that run .rst docs in ``docs`` folder by Python doctest library.
 
@@ -230,9 +230,7 @@ Most of the time you just need to run ./gradlew build which will make sure you p
    * - ./gradlew generateGrammarSource
      - (Re-)Generate ANTLR parser from grammar file.
    * - ./gradlew compileJava
-     - Compile all Java source files. 
-   * - ./gradlew checkstyle
-     - Run all checks according to Checkstyle configuration.
+     - Compile all Java source files.
    * - ./gradlew test
      - Run all unit tests.
    * - ./gradlew :integ-test:integTest

build.gradle

@@ -62,7 +62,6 @@ buildscript {
 plugins {
     id 'nebula.ospackage' version "8.3.0"
     id 'java-library'
-    id 'checkstyle'
     id "io.freefair.lombok" version "6.4.0"
     id 'jacoco'
     id 'com.diffplug.spotless' version '6.19.0'
@@ -184,23 +183,6 @@ jacocoTestCoverageVerification {
 }
 check.dependsOn jacocoTestCoverageVerification
 
-// TODO: fix code style in main and test source code
-allprojects {
-    apply plugin: 'checkstyle'
-    checkstyle {
-        configFile rootProject.file("config/checkstyle/google_checks.xml")
-        toolVersion "10.3.2"
-        configProperties = [
-                "org.checkstyle.google.suppressionfilter.config": rootProject.file("config/checkstyle/suppressions.xml")]
-        ignoreFailures = false
-    }
-}
-checkstyle {
-    configFile file("config/checkstyle/checkstyle.xml")
-}
-checkstyleMain.ignoreFailures = false
-checkstyleTest.ignoreFailures = true
-
 configurations.all {
     resolutionStrategy.force 'junit:junit:4.13.2'
     exclude group: "commons-logging", module: "commons-logging"