Bump minimum Gradle to 8.1

Author: simonlebras

plugin-gradle/src/main/java/com/diffplug/gradle/spotless/SpotlessPlugin.java

@@ -27,7 +27,7 @@
 
 public class SpotlessPlugin implements Plugin<Project> {
 	static final String SPOTLESS_MODERN = "spotlessModern";
-	static final String VER_GRADLE_MIN = "7.3";
+	static final String VER_GRADLE_MIN = "8.1";
 	static final String VER_GRADLE_MIN_VERSION_FOR_CUSTOM = "8.4";
 	private static final int MINIMUM_JRE = 17;
 

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020-2024 DiffPlug
+ * Copyright 2020-2025 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -24,8 +24,7 @@ public class ConfigurationCacheTest extends GradleIntegrationHarness {
 	@Override
 	public GradleRunner gradleRunner() throws IOException {
 		setFile("gradle.properties").toContent("org.gradle.unsafe.configuration-cache=true");
-		setFile("settings.gradle").toContent("enableFeaturePreview(\"STABLE_CONFIGURATION_CACHE\")");
-		return super.gradleRunner().withGradleVersion(GradleVersionSupport.STABLE_CONFIGURATION_CACHE.version);
+		return super.gradleRunner().withGradleVersion(GradleVersionSupport.MINIMUM.version);
 	}
 
 	@Test

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

@@ -46,9 +46,6 @@ public class GradleIntegrationHarness extends ResourceHarness {
 	public enum GradleVersionSupport {
 		MINIMUM(SpotlessPlugin.VER_GRADLE_MIN),
 
-		// https://docs.gradle.org/7.5/userguide/configuration_cache.html#config_cache:stable
-		STABLE_CONFIGURATION_CACHE("7.5"),
-
 		CUSTOM_STEPS(SpotlessPlugin.VER_GRADLE_MIN_VERSION_FOR_CUSTOM),
 
 		;
@@ -59,7 +56,8 @@ public enum GradleVersionSupport {
 			String minVersionForRunningJRE;
 			switch (Jvm.version()) {
 			case 25:
-				// TODO: https://docs.gradle.org/current/userguide/compatibility.html
+				minVersionForRunningJRE = "9.1.0";
+				break;
 			case 24:
 				minVersionForRunningJRE = "8.14";
 				break;
@@ -75,12 +73,6 @@ public enum GradleVersionSupport {
 			case 20:
 				minVersionForRunningJRE = "8.3";
 				break;
-			case 19:
-				minVersionForRunningJRE = "7.6";
-				break;
-			case 18:
-				minVersionForRunningJRE = "7.5";
-				break;
 			default:
 				minVersionForRunningJRE = null;
 				break;

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

@@ -88,8 +88,7 @@ private void runWith(boolean configurationCache, String... arguments) throws IOE
 	protected GradleRunner gradleRunner(boolean configurationCache) throws IOException {
 		if (configurationCache) {
 			setFile("gradle.properties").toContent("org.gradle.unsafe.configuration-cache=true");
-			setFile("settings.gradle").toContent("enableFeaturePreview(\"STABLE_CONFIGURATION_CACHE\")");
-			return super.gradleRunner().withGradleVersion(GradleVersionSupport.STABLE_CONFIGURATION_CACHE.version);
+			return super.gradleRunner().withGradleVersion(GradleVersionSupport.MINIMUM.version);
 		} else {
 			File gradleProps = new File(rootFolder(), "gradle.properties");
 			if (gradleProps.exists()) {

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

@@ -183,7 +183,7 @@ public void supportsConfigurationCache() throws Exception {
 		setFile("build.gradle").toResource("com/diffplug/gradle/spotless/NpmTestsWithoutNpmInstallationTest_gradle_node_plugin_example_1.gradle");
 		setFile("test.ts").toResource("npm/prettier/config/typescript.dirty");
 		BuildResult spotlessApply = gradleRunner()
-				.withGradleVersion(GradleVersionSupport.STABLE_CONFIGURATION_CACHE.version)
+				.withGradleVersion(GradleVersionSupport.MINIMUM.version)
 				.withArguments("--stacktrace", "--configuration-cache", "spotlessApply").build();
 		Assertions.assertThat(spotlessApply.getOutput()).contains("BUILD SUCCESSFUL");
 		assertFile("test.ts").sameAsResource("npm/prettier/config/typescript.configfile_prettier_2.clean");

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

@@ -44,7 +44,7 @@ public GradleRunner gradleRunner() throws IOException {
 		if (useConfigCache) {
 			setFile("gradle.properties").toLines("org.gradle.unsafe.configuration-cache=true",
 					"org.gradle.configuration-cache=true");
-			return super.gradleRunner().withGradleVersion(GradleVersionSupport.STABLE_CONFIGURATION_CACHE.version);
+			return super.gradleRunner().withGradleVersion(GradleVersionSupport.MINIMUM.version);
 		} else {
 			return super.gradleRunner();
 		}