[prone] Apply errorprone

gradle/error-prone.gradle

@@ -5,30 +5,88 @@ apply plugin: 'net.ltgt.errorprone'
 dependencies {
 	errorprone('com.google.errorprone:error_prone_core:2.42.0')
 	errorprone('tech.picnic.error-prone-support:error-prone-contrib:0.25.0')
-	constraints {
-		errorprone('com.google.guava:guava') {
-			version {
-				require('33.4.8-jre')
-			}
-			because('Older versions use deprecated methods in sun.misc.Unsafe')
-			// https://github.com/junit-team/junit-framework/pull/5039#discussion_r2414490581
-		}
-	}
 }
 
 tasks.withType(JavaCompile).configureEach {
 	options.errorprone {
-		disableAllChecks = true // consider removal to avoid error prone error´s, following convention over configuration.
+		disable( // not patchable
+				'FormatStringConcatenation',
+				'FunctionalInterfaceMethodChanged',
+				'JavaxInjectOnAbstractMethod',
+				'OverridesJavaxInjectableMethod',
+				'ReturnValueIgnored',
+				'Slf4jLogStatement',
+				'MissingSummary',
+				// patchable
+				'LexicographicalAnnotationAttributeListing',
+				'LexicographicalAnnotationListing',
+				'NonStaticImport',
+				'Slf4jLoggerDeclaration', // logger -> log
+				'StaticImport',
+				// critical, finds lots of bugs... unused configs and stuff.
+				'Unused',
+				'UnusedMethod',
+				'UnusedParameters',
+				'UnusedVariable',
+				)
 		error(
+				'AmbiguousJsonCreator',
+				'AssertJNullnessAssertion',
+				'AutowiredConstructor',
+				'CanonicalAnnotationSyntax',
+				'CollectorMutability',
 				'ConstantNaming',
+				'DirectReturn',
+				'EmptyMethod',
+				'ExplicitArgumentEnumeration',
+				'ExplicitEnumOrdering',
+				'IdentityConversion',
+				'ImmutablesSortedSetComparator',
+				'IsInstanceLambdaUsage',
+				'MockitoMockClassReference',
+				'MockitoStubbing',
+				'NestedOptionals',
+				'PrimitiveComparison',
 				'RedundantStringConversion',
+				'RedundantStringEscape',
+				'SelfAssignment',
+				'StringJoin',
+				'StringJoining',
 				)
+		// fixme bug: this only happens when the file is dirty!
+		// up2date checking (caching) must consider file changes, as file is currently corrupt!
+		// fix SelfTest.java:L22 ForbidGradleInternal(import org.gradle.api.internal.project.ProjectInternal;)
+		errorproneArgs.add('-XepExcludedPaths:.*/SelfTest.java')
 		if (!getenv().containsKey('CI') && getenv('IN_PLACE')?.toBoolean()) {
 			errorproneArgs.addAll(
 					'-XepPatchLocation:IN_PLACE',
 					'-XepPatchChecks:' +
+					'AmbiguousJsonCreator,' +
+					'ArrayEquals,' +
+					'AssertJNullnessAssertion,' +
+					'AutowiredConstructor,' +
+					'CanonicalAnnotationSyntax,' +
+					'CollectorMutability,' +
 					'ConstantNaming,' +
-					'RedundantStringConversion,'
+					'DirectReturn,' +
+					'EmptyMethod,' +
+					'ExplicitArgumentEnumeration,' +
+					'ExplicitEnumOrdering,' +
+					'FormatStringConcatenation,' +
+					'IdentityConversion,' +
+					'ImmutablesSortedSetComparator,' +
+					'IsInstanceLambdaUsage,' +
+					'MockitoMockClassReference,' +
+					'MockitoStubbing,' +
+					'NestedOptionals,' +
+					'PrimitiveComparison,' +
+					'RedundantStringConversion,' +
+					'RedundantStringEscape,' +
+					'SelfAssignment,' +
+					'Slf4jLogStatement,' +
+					'StringJoin,' +
+					'StringJoining,' +
+					'TimeZoneUsage,'
 					)
 		}
 	}

gradle/rewrite.gradle

@@ -2,7 +2,6 @@ apply plugin: 'org.openrewrite.rewrite'
 
 rewrite {
 	activeRecipe('com.diffplug.spotless.openrewrite.SanityCheck')
-	activeStyle('com.diffplug.spotless.openrewrite.SpotlessFormat')
 	exclusions.addAll(
 			'**.dirty.java',
 			'**FormatterProperties.java',

lib-extra/src/test/java/com/diffplug/spotless/extra/java/EclipseJdtEqualityTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2024 DiffPlug
+ * Copyright 2024-2025 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,6 +20,7 @@
 import java.io.IOException;
 import java.io.ObjectOutputStream;
 import java.io.Serializable;
+import java.util.Arrays;
 import java.util.List;
 
 import org.junit.jupiter.api.Assertions;
@@ -43,7 +44,7 @@ public void test() throws Exception {
 
 		var serialized1 = toBytes(step1);
 		var serialized2 = toBytes(step2);
-		Assertions.assertFalse(serialized1.equals(serialized2));
+		Assertions.assertFalse(Arrays.equals(serialized1, serialized2));
 	}
 
 	private static FormatterStep withSettingsFile(File settingsFile) {

lib/src/compatKtLint0Dot48Dot0/java/com/diffplug/spotless/glue/ktlint/compat/KtLintCompat0Dot48Dot0Adapter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2023-2024 DiffPlug
+ * Copyright 2023-2025 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -115,7 +115,7 @@ public String format(
 	private static EditorConfigOverride createEditorConfigOverride(final List<Rule> rules, Map<String, Object> editorConfigOverrideMap) {
 		// Get properties from rules in the rule sets
 		Stream<EditorConfigProperty<?>> ruleProperties = rules.stream()
-				.filter(rule -> rule instanceof UsesEditorConfigProperties)
+				.filter(UsesEditorConfigProperties.class::isInstance)
 				.flatMap(rule -> ((UsesEditorConfigProperties) rule).getEditorConfigProperties().stream());
 
 		// Create a mapping of properties to their names based on rule properties and default properties

lib/src/main/java/com/diffplug/spotless/PaddedCell.java

@@ -153,7 +153,7 @@ public String canonical() {
 		// @formatter:off
 		switch (type) {
 		case CONVERGE:	return steps.get(steps.size() - 1);
-		case CYCLE:		return Collections.min(steps, Comparator.comparing(String::length).thenComparing(Function.identity()));
+		case CYCLE:		return Collections.min(steps, Comparator.comparingInt(String::length).thenComparing(Function.identity()));
 		case DIVERGE:	throw new IllegalArgumentException("No canonical form for a diverging result");
 		default:	throw new IllegalArgumentException("Unknown type: " + type);
 		}

lib/src/main/java/com/diffplug/spotless/biome/BiomeStep.java

@@ -25,7 +25,6 @@
 import java.nio.file.attribute.PosixFilePermission;
 import java.util.ArrayList;
 import java.util.HashSet;
-import java.util.Set;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -299,7 +298,7 @@ private State createState() throws IOException, InterruptedException {
 		validateBiomeExecutable(resolvedPathToExe);
 		validateBiomeConfigPath(configPath, version);
 		LOGGER.debug("Using Biome executable located at  '{}'", resolvedPathToExe);
-		var exeSignature = FileSignature.signAsList(Set.of(new File(resolvedPathToExe)));
+		var exeSignature = FileSignature.signAsList(new File(resolvedPathToExe));
 		makeExecutable(resolvedPathToExe);
 		return new State(resolvedPathToExe, exeSignature, configPath, language);
 	}

plugin-gradle/src/test/java/com/diffplug/gradle/spotless/GitRatchetGradleTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2024 DiffPlug
+ * Copyright 2016-2025 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -58,7 +58,7 @@ public GradleRunner gradleRunner() throws IOException {
 
 	@ParameterizedTest
 	//@ValueSource(ints = {0, 1}) // TODO: this is a flaky configuration cache issue that started with Gradle 8.5
-	@ValueSource(ints = {0})
+	@ValueSource(ints = 0)
 	void singleProjectExhaustive(int useConfigCache) throws Exception {
 		try (Git git = initRepo()) {
 			if (useConfigCache == 1) {
@@ -158,7 +158,7 @@ private BuildResultAssertion assertFail(String... tasks) throws Exception {
 
 	@ParameterizedTest
 	//@ValueSource(ints = {0, 1}) // TODO: this is a flaky configuration cache issue that started with Gradle 8.5
-	@ValueSource(ints = {0})
+	@ValueSource(ints = 0)
 	void multiProject(int useConfigCache) throws Exception {
 		try (Git git = initRepo()) {
 			if (useConfigCache == 1) {

plugin-gradle/src/test/java/com/diffplug/gradle/spotless/SpotlessTaskImplTest.java

@@ -29,17 +29,17 @@
 public class SpotlessTaskImplTest {
 	@Test
 	public void testThrowsMessageContainsFilename() throws Exception {
-		SpotlessTaskImpl task = Mockito.mock(SpotlessTaskImpl.class, Mockito.CALLS_REAL_METHODS);
+		SpotlessTaskImpl task = Mockito.mock(Mockito.CALLS_REAL_METHODS);
 		Mockito.when(task.getLogger()).thenReturn(Mockito.mock(Logger.class));
 
 		File projectDir = Path.of("unitTests", "projectDir").toFile();
-		DirectoryProperty projectDirProperty = Mockito.mock(DirectoryProperty.class, Mockito.RETURNS_DEEP_STUBS);
+		DirectoryProperty projectDirProperty = Mockito.mock(Mockito.RETURNS_DEEP_STUBS);
 		Mockito.when(projectDirProperty.get().getAsFile()).thenReturn(projectDir);
 
 		Mockito.when(task.getProjectDir()).thenReturn(projectDirProperty);
 
 		File input = Path.of("unitTests", "projectDir", "someInput").toFile();
-		Formatter formatter = Mockito.mock(Formatter.class);
+		Formatter formatter = Mockito.mock();
 
 		Assertions.assertThatThrownBy(() -> task.processInputFile(null, formatter, input, "someInput")).hasMessageContaining(input.toString());
 	}

plugin-maven/src/test/java/com/diffplug/spotless/maven/FileLocatorTest.java

@@ -40,7 +40,7 @@ class FileLocatorTest extends ResourceHarness {
 
 	@BeforeEach
 	void beforeEach() {
-		resourceManager = mock(ResourceManager.class);
+		resourceManager = mock();
 		fileLocator = new FileLocator(resourceManager, rootFolder(), rootFolder());
 	}
 

plugin-maven/src/test/java/com/diffplug/spotless/maven/incremental/FileIndexHarness.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021 DiffPlug
+ * Copyright 2021-2025 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -35,8 +35,8 @@ abstract class FileIndexHarness {
 
 	protected static final PluginFingerprint FINGERPRINT = PluginFingerprint.from("foo");
 
-	protected final FileIndexConfig config = mock(FileIndexConfig.class);
-	protected final Log log = mock(Log.class);
+	protected final FileIndexConfig config = mock();
+	protected final Log log = mock();
 
 	protected Path tempDir;
 

plugin-maven/src/test/java/com/diffplug/spotless/maven/incremental/NoopCheckerTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 DiffPlug
+ * Copyright 2021-2025 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -59,7 +59,7 @@ void beforeEach() throws Exception {
 
 	@Test
 	void deletesExistingIndexFileWhenCreated() {
-		Log log = mock(Log.class);
+		Log log = mock();
 		try (UpToDateChecker realChecker = UpToDateChecker.forProject(project, indexFile, singletonList(dummyFormatter()), log)) {
 			realChecker.setUpToDate(existingSourceFile);
 		}
@@ -76,7 +76,7 @@ void deletesExistingIndexFileWhenCreated() {
 	void doesNothingWhenIndexFileDoesNotExist() {
 		assertThat(indexFile).doesNotExist();
 
-		Log log = mock(Log.class);
+		Log log = mock();
 		try (UpToDateChecker noopChecker = UpToDateChecker.noop(project, indexFile, log)) {
 			assertThat(noopChecker).isNotNull();
 		}

rewrite.yml

@@ -66,28 +66,3 @@ recipeList:
   - tech.picnic.errorprone.refasterrules.TimeRulesRecipes
   # - org.openrewrite.java.migrate.lang.FindVirtualThreadOpportunities # don't want to use: https://github.com/diffplug/spotless/pull/2684#discussion_r2433831887
 ---
-name: com.diffplug.spotless.openrewrite.SpotlessFormat
-styleConfigs:
-  - org.openrewrite.java.style.ImportLayoutStyle:
-      classCountToUseStarImport: 999
-      nameCountToUseStarImport: 999
-      # bug https://github.com/openrewrite/rewrite/issues/6107
-      #      layout:
-      #        - import java.*
-      #        - <blank line>
-      #        - import javax.*
-      #        - <blank line>
-      #        - import org.*
-      #        - <blank line>
-      #        - import com.*
-      #        - <blank line>
-      #        - import com.diffplug.*
-      #        - <blank line>
-      #        - import static all other imports
-      #        - <blank line>
-      #        - import all other imports
-      #        - <blank line>
-  - org.openrewrite.java.style.TabsAndIndentsStyle:
-      useTabCharacter: true
-      tabSize: 4
----

settings.gradle

@@ -1,3 +1,5 @@
+import static java.lang.System.getenv
+
 pluginManagement {
 	repositories {
 		mavenCentral()
@@ -6,25 +8,17 @@ pluginManagement {
 }
 
 plugins {
+	id 'com.adarshr.test-logger' version '4.0.0' apply false // https://github.com/radarsh/gradle-test-logger-plugin/blob/develop/CHANGELOG.md
 	id 'com.diffplug.spotless' version '8.0.0' apply false
-	// https://plugins.gradle.org/plugin/com.gradle.plugin-publish
-	id 'com.gradle.plugin-publish' version '2.0.0' apply false
-	// https://github.com/gradle-nexus/publish-plugin/releases
-	id 'io.github.gradle-nexus.publish-plugin' version '2.0.0' apply false
-	// https://github.com/spotbugs/spotbugs-gradle-plugin/releases
-	id 'com.github.spotbugs' version '6.4.4' apply false
-	// https://github.com/diffplug/spotless-changelog/blob/main/CHANGELOG.md
-	id 'com.diffplug.spotless-changelog' version '3.1.2' apply false
-	// https://github.com/radarsh/gradle-test-logger-plugin/blob/develop/CHANGELOG.md
-	id 'com.adarshr.test-logger' version '4.0.0' apply false
-	// https://github.com/davidburstrom/version-compatibility-gradle-plugin/tags
-	id 'io.github.davidburstrom.version-compatibility' version '0.5.0' apply false
-	// https://plugins.gradle.org/plugin/com.gradle.develocity
-	id 'com.gradle.develocity' version '4.2.2'
-	// https://github.com/equodev/equo-ide/blob/main/plugin-gradle/CHANGELOG.md
-	id 'dev.equo.ide' version '1.7.8' apply false
-	id 'org.openrewrite.rewrite' version '7.18.0' apply false
+	id 'com.diffplug.spotless-changelog' version '3.1.2' apply false // https://github.com/diffplug/spotless-changelog/blob/main/CHANGELOG.md
+	id 'com.github.spotbugs' version '6.4.4' apply false // https://github.com/spotbugs/spotbugs-gradle-plugin/releases
+	id 'com.gradle.develocity' version '4.2.2' // https://plugins.gradle.org/plugin/com.gradle.develocity
+	id 'com.gradle.plugin-publish' version '2.0.0' apply false // https://plugins.gradle.org/plugin/com.gradle.plugin-publish
+	id 'dev.equo.ide' version '1.7.8' apply false // https://github.com/equodev/equo-ide/blob/main/plugin-gradle/CHANGELOG.md
+	id 'io.github.davidburstrom.version-compatibility' version '0.5.0' apply false // https://github.com/davidburstrom/version-compatibility-gradle-plugin/tags
+	id 'io.github.gradle-nexus.publish-plugin' version '2.0.0' apply false // https://github.com/gradle-nexus/publish-plugin/releases
 	id 'net.ltgt.errorprone' version '4.3.0' apply false
+	id 'org.openrewrite.rewrite' version '7.18.0' apply false
 }
 
 dependencyResolutionManagement {
@@ -61,14 +55,12 @@ if (System.env['CI'] != null) {
 	}
 }
 
-def isCI = providers.environmentVariable('CI').present
-
 develocity {
 	buildScan {
 		termsOfUseUrl = "https://gradle.com/terms-of-service"
 		termsOfUseAgree = "yes"
 		publishing {
-			onlyIf { isCI }
+			onlyIf { providers.environmentVariable('CI').present }
 		}
 	}
 }
@@ -78,26 +70,25 @@ enableFeaturePreview("TYPESAFE_PROJECT_ACCESSORS")
 
 rootProject.name = 'spotless'
 
-include 'lib'		// reusable library with no dependencies
-include 'testlib'	// library for sharing test infrastructure between the projects below
-
+include 'lib' // reusable library with no dependencies
 include 'lib-extra'	// reusable library with lots of dependencies
 include 'plugin-gradle'	// gradle-specific glue code
+include 'testlib' // library for sharing test infrastructure between the projects below
 
-def getStartProperty(java.lang.String name) {
+def getStartProperty(String name) {
 	def value = startParameter.getProjectProperties().get(name)
 	if(null != value) {
 		return value
 	}
 	// user properties are not available in the startParameter
-	def userPropertiesFile = new java.io.File(startParameter.getGradleUserHomeDir(), 'gradle.properties')
-	def userProperties = new java.util.Properties()
+	def userPropertiesFile = new File(startParameter.getGradleUserHomeDir(), 'gradle.properties')
+	def userProperties = new Properties()
 	if (userPropertiesFile.exists()) {
 		userProperties.load(userPropertiesFile.newReader())
 	}
 	return userProperties.get(name)
 }
 
-if (System.getenv('SPOTLESS_EXCLUDE_MAVEN') != 'true' && getStartProperty('SPOTLESS_EXCLUDE_MAVEN') != 'true') {
-	include 'plugin-maven'	// maven-specific glue code
+if (!getenv('SPOTLESS_EXCLUDE_MAVEN')?.toBoolean() && !Boolean.valueOf(getStartProperty('SPOTLESS_EXCLUDE_MAVEN') as String)) {
+	include 'plugin-maven' // maven-specific glue code
 }