[fixes #3474] lombok.jar now contains zero paths that could clash with other modules, as that's already enough to trigger split package errors from jigsaw.

buildScripts/compile.ant.xml

@@ -282,7 +282,7 @@ lombok.launch.AnnotationProcessorHider$ClaimingProcessor,isolating</echo>
 					<patternset refid="packing.shadowed" />
 				</multirootfileset>
 				<firstmatchmapper>
-					<globmapper from="*.class" to="*.SCL.lombok" />
+					<globmapper from="*.class" to="SCL.lombok/*.SCL.lombok" />
 					<identitymapper />
 				</firstmatchmapper>
 			</mappedresources>

doc/changelog.markdown

@@ -10,6 +10,7 @@ Lombok Changelog
 * BUGFIX: Calling extension methods such that automatic widening is applied (i.e. calling `void ext(long arg)` with an `int`) would fail at runtime. [Issue #3463](https://github.com/projectlombok/lombok/issues/3463).
 * BUGFIX: Extension methods can now be used in records. [Issue #3450](https://github.com/projectlombok/lombok/issues/3450).
 * BUGFIX: `@Getter(lazy=true)` with complicated initialization expressions would fail on javac. [Issue #3314](https://github.com/projectlombok/lombok/issues/3314).
+* BUGFIX: Using the maven surefire plugin with a `module-info.java` based project would fail with a `SurefireBooterForkException`. [Issue #3474](https://github.com/projectlombok/lombok/issues/3474).
 
 ### v1.18.28 (May 24th, 2023)
 * PLATFORM: JDK20 support added. [Issue #3353](https://github.com/projectlombok/lombok/issues/3353).

src/launch/lombok/launch/ShadowClassLoader.java

@@ -430,9 +430,13 @@ class ShadowClassLoader extends ClassLoader {
 		return false;
 	}
 	
+	private String toSclResourceName(String name) {
+		return "SCL." + sclSuffix + "/" + name.substring(0, name.length() - 6) + ".SCL." + sclSuffix;
+	}
+	
 	@Override public Enumeration<URL> getResources(String name) throws IOException {
 		String altName = null;
-		if (name.endsWith(".class")) altName = name.substring(0, name.length() - 6) + ".SCL." + sclSuffix;
+		if (name.endsWith(".class")) altName = toSclResourceName(name);
 		
 		// Vector? Yes, we need one:
 		// * We can NOT make inner classes here (this class is loaded with special voodoo magic in eclipse, as a one off, it's not a full loader.
@@ -475,7 +479,7 @@ class ShadowClassLoader extends ClassLoader {
 	private URL getResource_(String name, boolean noSuper) {
 		String altName = null;
 		name = shader == null ? name : shader.reverseResourceName(name);
-		if (name.endsWith(".class")) altName = name.substring(0, name.length() - 6) + ".SCL." + sclSuffix;
+		if (name.endsWith(".class")) altName = toSclResourceName(name);
 		
 		for (File ce : override) {
 			URL url = getResourceFromLocation(name, altName, ce);