[jdk9] forcing new rounds when compiling multiple modules didn’t work. (FilerException on creating the new round).

src/core/lombok/javac/apt/InterceptingJavaFileManager.java

@@ -42,14 +42,14 @@ final class InterceptingJavaFileManager extends ForwardingJavaFileManager<JavaFi
 	}
 	
 	@Override public JavaFileObject getJavaFileForOutput(Location location, String className, final Kind kind, FileObject sibling) throws IOException {
-		if (className.startsWith("lombok.dummy.ForceNewRound")) {
+		if (className.contains("lombok.dummy.ForceNewRound")) {
 			final String name = className.replace(".", "/") + kind.extension;
 			return LombokFileObjects.createEmpty(compiler, name, kind);
 		}
+		
 		JavaFileObject fileObject = fileManager.getJavaFileForOutput(location, className, kind, sibling);
-		if (kind != Kind.CLASS) {
-			return fileObject;
-		}
+		if (kind != Kind.CLASS) return fileObject;
+		
 		return LombokFileObjects.createIntercepting(compiler, fileObject, className, diagnostics);
 	}
 }

src/core/lombok/javac/apt/LombokProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2009-2017 The Project Lombok Authors.
+ * Copyright (C) 2009-2018 The Project Lombok Authors.
  * 
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -301,7 +301,10 @@ public class LombokProcessor extends AbstractProcessor {
 		
 		// Step 1: Take all CUs which aren't already in the map. Give them the first priority level.
 		
+		String randomModuleName = null;
+		
 		for (Element element : roundEnv.getRootElements()) {
+			if (randomModuleName == null) randomModuleName = getModuleNameFor(element);
 			JCCompilationUnit unit = toUnit(element);
 			if (unit == null) continue;
 			if (roots.containsKey(unit)) continue;
@@ -344,20 +347,22 @@ public class LombokProcessor extends AbstractProcessor {
 			
 			if (newLevels.isEmpty()) return false;
 			newLevels.retainAll(priorityLevelsRequiringResolutionReset);
-			if (!newLevels.isEmpty()){
+			if (!newLevels.isEmpty()) {
 				// Force a new round to reset resolution. The next round will cause this method (process) to be called again.
-				forceNewRound((JavacFiler) processingEnv.getFiler());
+				forceNewRound(randomModuleName, (JavacFiler) processingEnv.getFiler());
 				return false;
 			}
-		    // None of the new levels need resolution, so just keep going.
+			// None of the new levels need resolution, so just keep going.
 		}
 	}
 	
 	private int dummyCount = 0;
-	private void forceNewRound(JavacFiler filer) {
+	private void forceNewRound(String randomModuleName, JavacFiler filer) {
 		if (!filer.newFiles()) {
 			try {
-				JavaFileObject dummy = filer.createSourceFile("lombok.dummy.ForceNewRound" + (dummyCount++));
+				String name = "lombok.dummy.ForceNewRound" + (dummyCount++);
+				if (randomModuleName != null) name = randomModuleName + "/" + name;
+				JavaFileObject dummy = filer.createSourceFile(name);
 				Writer w = dummy.openWriter();
 				w.close();
 			} catch (Exception e) {
@@ -368,6 +373,19 @@ public class LombokProcessor extends AbstractProcessor {
 		}
 	}
 	
+	private String getModuleNameFor(Element element) {
+		while (element != null) {
+			if (element.getKind().name().equals("MODULE")) {
+				String n = element.getSimpleName().toString().trim();
+				return n.isEmpty() ? null : n;
+			}
+			Element n = element.getEnclosingElement();
+			if (n == element) return null;
+			element = n;
+		}
+		return null;
+	}
+	
 	private JCCompilationUnit toUnit(Element element) {
 		TreePath path = trees == null ? null : trees.getPath(element);
 		if (path == null) return null;

website/templates/setup/javac.html

@@ -17,8 +17,10 @@
 			</ul>
 			Both are equally effective. Note that you will have to add lombok to your <code>module-info.java</code> file:<pre>
 module <em>myapp</em> {
-	requires lombok;
+	requires static lombok;
 }</pre>
+		</p><p>
+			The 'static' part ensures that you won't need lombok to be present at runtime.
 		</p><p>
 			Feedback about JDK9 module-info support can be given at <a href="https://github.com/rzwitserloot/lombok/issues/985">github issue #985</a>.
 		</p>