Update default Greclipse version

Author: jochenberger

CHANGES.md

@@ -17,6 +17,7 @@ We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (
 ### Changes
 - Bump default `cleanthat` version `2.24` -> `2.25`. ([#2903](https://github.com/diffplug/spotless/pull/2903))
 - Bump default `eclipse-jdt` version from `4.35` to `4.39`. ([#2912](https://github.com/diffplug/spotless/pull/2912))
+* Bump default `greclipse` version to latest `4.35` -> `4.39`. ([#2924](https://github.com/diffplug/spotless/pull/2924))
 
 ## [4.5.0] - 2026-03-18
 ### Added

lib-extra/src/main/java/com/diffplug/spotless/extra/groovy/GrEclipseFormatterStep.java

@@ -34,7 +34,7 @@ public final class GrEclipseFormatterStep {
 	private GrEclipseFormatterStep() {}
 
 	private static final String NAME = "eclipse groovy formatter";
-	private static final Jvm.Support<String> JVM_SUPPORT = Jvm.<String> support(NAME).add(17, "4.35");
+	private static final Jvm.Support<String> JVM_SUPPORT = Jvm.<String> support(NAME).add(17, "4.38").add(21, "4.39");
 
 	public static String defaultVersion() {
 		return JVM_SUPPORT.getRecommendedFormatterVersion();
@@ -52,7 +52,9 @@ protected P2Model model(String version) {
 					throw new IllegalArgumentException("4.8 is the oldest version we support, this was " + version);
 				}
 				String greclipseVersion;
-				if (eVersion >= 28) {
+				if (eVersion >= 38) {
+					greclipseVersion = "6." + (eVersion - 38) + ".0";
+				} else if (eVersion >= 28) {
 					greclipseVersion = "5." + (eVersion - 28) + ".0";
 				} else if (eVersion >= 18) {
 					greclipseVersion = "4." + (eVersion - 18) + ".0";

plugin-gradle/CHANGES.md

@@ -12,6 +12,7 @@ We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (
 ### Changes
 - Bump default `cleanthat` version `2.24` -> `2.25`. ([#2903](https://github.com/diffplug/spotless/pull/2903))
 - Bump default `eclipse-jdt` version from `4.35` to `4.39`. ([#2912](https://github.com/diffplug/spotless/pull/2912))
+* Bump default `greclipse` version to latest `4.35` -> `4.39`. ([#2924](https://github.com/diffplug/spotless/pull/2924))
 
 ## [8.4.0] - 2026-03-18
 ### Added

plugin-maven/CHANGES.md

@@ -10,6 +10,7 @@ We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (
 ### Changes
 - Bump default `cleanthat` version `2.24` -> `2.25`. ([#2903](https://github.com/diffplug/spotless/pull/2903))
 - Bump default `eclipse-jdt` version from `4.35` to `4.39`. ([#2912](https://github.com/diffplug/spotless/pull/2912))
+* Bump default `greclipse` version to latest `4.35` -> `4.39`. ([#2924](https://github.com/diffplug/spotless/pull/2924))
 
 ## [3.4.0] - 2026-03-18
 ### Added