From 0a38f0c257f9708dd58f3b988f710ec264945bdb Mon Sep 17 00:00:00 2001
From: Goooler <wangzongler@gmail.com>
Date: Fri, 14 Nov 2025 12:06:53 +0800
Subject: [PATCH] Improve the error message for newer Java versions in tests

---
 .../diffplug/gradle/spotless/GradleIntegrationHarness.java  | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/plugin-gradle/src/test/java/com/diffplug/gradle/spotless/GradleIntegrationHarness.java b/plugin-gradle/src/test/java/com/diffplug/gradle/spotless/GradleIntegrationHarness.java
index 3402cbada3..dfa0ae4473 100644
--- a/plugin-gradle/src/test/java/com/diffplug/gradle/spotless/GradleIntegrationHarness.java
+++ b/plugin-gradle/src/test/java/com/diffplug/gradle/spotless/GradleIntegrationHarness.java
@@ -58,8 +58,12 @@ public enum GradleVersionSupport {
 		GradleVersionSupport(String version) {
 			String minVersionForRunningJRE;
 			switch (Jvm.version()) {
+			case 26:
+				throw new IllegalStateException("Gradle does not yet support running on Java 26. " +
+						"You need to update the case ref to https://docs.gradle.org/current/userguide/compatibility.html.");
 			case 25:
-				// TODO: https://docs.gradle.org/current/userguide/compatibility.html
+				minVersionForRunningJRE = "9.1.0";
+				break;
 			case 24:
 				minVersionForRunningJRE = "8.14";
 				break;