Add mapping for jdt compiler

Fixes #157

Author: jmini

CHANGES.md

@@ -2,6 +2,9 @@
 
 ## [Unreleased]
 
+### Fixed
+- Fix ecj mapping in eclipseMavenCentral ([#158](https://github.com/diffplug/goomph/pull/158))
+
 ## [3.32.1] - 2021-09-09
 
 ### Fixed

src/main/java/com/diffplug/gradle/eclipse/MavenCentralMapping.java

@@ -51,7 +51,9 @@ public static boolean isEclipseGroup(String group) {
 
 	/** Returns the MavenCentral groupId:artifactId appropriate for the given bundleId. */
 	public static String groupIdArtifactId(String bundleId) {
-		if (bundleId.startsWith(JDT)) {
+		if ("org.eclipse.jdt.core.compiler.batch".equals(bundleId)) {
+			return JDT + ":ecj";
+		} else if (bundleId.startsWith(JDT)) {
 			return JDT + ":" + bundleId;
 		} else if (bundleId.startsWith(PDE)) {
 			return PDE + ":" + bundleId;