completely remove checkstyle and replace it with a simple regex check

This is ~ 2 orders of magnitude faster on my machine, so it can be
executed as part of the compileJava task. Also, it actually logs the
failures, instead of making me go hunt for them in some generated
HTML-based report.

Author: gavinking

Diff for: .github/workflows/atlas.yml

@@ -113,6 +113,5 @@ jobs:
           name: test-reports-java11-${{ matrix.rdbms }}
           path: |
             ./**/target/reports/tests/
-            ./**/target/reports/checkstyle/
       - name: Omit produced artifacts from build cache
         run: ./ci/before-cache.sh

Diff for: .github/workflows/contributor-build.yml

@@ -121,6 +121,5 @@ jobs:
           name: test-reports-java11-${{ matrix.rdbms }}
           path: |
             ./**/target/reports/tests/
-            ./**/target/reports/checkstyle/
       - name: Omit produced artifacts from build cache
         run: ./ci/before-cache.sh

Diff for: .idea/inspectionProfiles/Project_Default.xml

@@ -83,7 +83,6 @@ Do your thing!
 up the related commits and display them on the JIRA issue
 * Make sure you have added the necessary tests for your changes
 * Run _all_ the tests to ensure nothing else was accidentally broken
-* Make sure your source does not violate the _checkstyles_
 
 _Before committing, if you want to pull in the latest upstream changes (highly
 appreciated btw), please use rebasing rather than merging.  Merging creates

Diff for: CONTRIBUTING.md

@@ -76,11 +76,6 @@ elif [ "$RDBMS" == "informix" ]; then
   goal="-Pdb=informix"
 fi
 
-# Disable checkstyle
-#if [ -n "$goal" ]; then
-goal="$goal -x checkstyleMain -DPOPULATE_REMOTE=true"
-#fi
-
 function logAndExec() {
   echo 1>&2 "Executing:" "${@}"
   exec "${@}"

Diff for: ci/build.sh

@@ -36,7 +36,6 @@ apply plugin: 'de.thetaphi.forbiddenapis'
 apply plugin: 'com.diffplug.spotless'
 
 apply plugin: "jacoco"
-apply plugin: 'checkstyle'
 apply plugin: 'build-dashboard'
 apply plugin: 'project-report'
 
@@ -448,26 +447,37 @@ tasks.copyResourcesToIntelliJOutFolder.mustRunAfter processTestResources
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 // Report configs
 
-checkstyle {
-	it.sourceSets = [ project.sourceSets.main ]
-	configFile = rootProject.file( 'shared/config/checkstyle/checkstyle.xml' )
-	showViolations = false
-}
-
-// exclude generated java sources - by explicitly setting the base source dir
-tasks.checkstyleMain.source = 'src/main/java'
-tasks.checkstyleMain
-		.exclude('org/hibernate/processor/util/NullnessUtil.java')
-		.exclude('org/hibernate/internal/util/NullnessUtil.java')
-// For some big files we need more heap memory than the default 512m for parsing
-tasks.checkstyleMain.maxHeapSize = "640m"
-
-// define a second checkstyle task for checking non-fatal violations
-task nonFatalCheckstyle(type:Checkstyle) {
-	source = project.sourceSets.main.java
-	classpath = project.configurations.checkstyle
-	showViolations = false
-	configFile = rootProject.file( 'shared/config/checkstyle/checkstyle-non-fatal.xml' )
+task enforceRules {
+	doLast {
+		def illegalImport = ~/^import (sun|java.awt|org.slf4j)/
+		def missingNewline = ~/^\s*}\s*(else|catch|finally)/
+		def lowerEll = ~/\b\d+l\b/
+		def errors = 0
+		def tree = fileTree("src/main/java/")
+		tree.include "**/*.java"
+		tree.each { file ->
+			def lineNum = 0
+			def shortName = file.path.substring(rootDir.path.length())
+			file.eachLine { line ->
+				lineNum++
+				if (line =~ illegalImport) {
+					errors++
+					logger.error("Illegal import in ${shortName}\n${lineNum}: ${line}")
+				}
+				if (line =~ missingNewline) {
+					errors++
+					logger.error("Missing newline in ${shortName}\n${lineNum}: ${line}")
+				}
+				if (line =~ lowerEll) {
+					errors++
+					logger.error("Lowercase long literal in ${shortName}\n${lineNum}: ${line}")
+				}
+			}
+		}
+		if ( errors>0 ) {
+			throw new GradleException("Code rules were violated ($errors problems)")
+		}
+	}
 }
 
 spotless {
@@ -483,6 +493,8 @@ spotless {
 	}
 }
 
+tasks.spotlessApply.dependsOn enforceRules
+
 
 class CompilerStubsArgumentProvider implements CommandLineArgumentProvider {
 

Diff for: gradle/java-module.gradle

@@ -14,9 +14,6 @@ apply from: rootProject.file( 'gradle/java-module.gradle' )
 java.modularity.inferModulePath = true
 
 
-// Checkstyle fails for module-info
-checkstyleMain.exclude '**/module-info.java'
-
 dependencies {
 	api project( ':hibernate-core' )
 	api project( ':hibernate-envers' )

Diff for: hibernate-integrationtest-java-modules/hibernate-integrationtest-java-modules.gradle

@@ -49,6 +49,3 @@ dependencies {
     annotationProcessor project( ':hibernate-processor' )
 }
 
-tasks.checkstyleMain {
-    exclude '**/org/hibernate/orm/test/legacy/**'
-}

Diff for: hibernate-testing/hibernate-testing.gradle

@@ -15,7 +15,7 @@ First, a list of resources you will need access to in order to perform a release
 
 == Steps
 
-1. Perform `./gradlew preVerifyRelease` locally (after pulling all upstream changes).  The Jenkins job does only the release steps, and we need to make sure tests and checkstyle especially are ok
+1. Perform `./gradlew preVerifyRelease` locally (after pulling all upstream changes).  The Jenkins job does only the release steps, and we need to make sure tests are ok
 2. Mark the version as released in Jira
 3. Close all issues associated with the version as closed.  Be sure to remove the version from any issues that are not resolved (e.g. rejected) - the Jira "release notes" mechanism includes all issues with that version as the fix-for regardless of the resolution
 4. Start the https://ci.hibernate.org/view/Release/job/hibernate-orm-release-jdk17/[Jenkins job].  It is a parameterized build - Jenkins will prompt user for needed information: