Resolve delegate target class to find implemented methods

src/core/lombok/javac/handlers/HandleDelegate.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2010-2021 The Project Lombok Authors.
+ * Copyright (C) 2010-2023 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
@@ -46,6 +46,7 @@
 import com.sun.tools.javac.code.Attribute.Compound;
 import com.sun.tools.javac.code.Flags;
 import com.sun.tools.javac.code.Symbol;
+import com.sun.tools.javac.code.Symbol.ClassSymbol;
 import com.sun.tools.javac.code.Symbol.MethodSymbol;
 import com.sun.tools.javac.code.Symbol.TypeSymbol;
 import com.sun.tools.javac.code.Type;
@@ -177,9 +178,16 @@ public class HandleDelegate extends JavacAnnotationHandler<Delegate> {
 		Set<String> banList = new HashSet<String>();
 		banList.addAll(METHODS_IN_OBJECT);
 
+
 		// Add already implemented methods to ban list
 		JavacNode typeNode = upToTypeNode(annotationNode);
-		for (Symbol m : ((JCClassDecl)typeNode.get()).sym.getEnclosedElements()) {
+		JCClassDecl classDecl = ((JCClassDecl)typeNode.get());
+		ClassSymbol targetSymbol = classDecl.sym;
+		if (targetSymbol == null) {
+			// Local classes and anonymous classes needs to be resolved
+			targetSymbol = (ClassSymbol) reso.resolveMethodMember(typeNode).get(classDecl).type.tsym;
+		}
+		for (Symbol m : targetSymbol.getEnclosedElements()) {
 			if (m instanceof MethodSymbol) {
 				banList.add(printSig((ExecutableType) m.asType(), m.name, annotationNode.getTypesUtil()));
 			}

test/transform/resource/after-delombok/DelegateInNestedClass.java

@@ -0,0 +1,43 @@
+class DelegateInNestedClass {
+	void localClass() {
+
+		class LocalClass {
+			private final java.lang.Runnable field = null;
+
+			@java.lang.SuppressWarnings("all")
+			public void run() {
+				this.field.run();
+			}
+		}
+	}
+
+	void anonymousClass() {
+		Runnable r = new Runnable() {
+			private final java.lang.Runnable field = null;
+			@java.lang.SuppressWarnings("all")
+			public void run() {
+				this.field.run();
+			}
+		};
+	}
+
+
+	class InnerClass {
+		private final java.lang.Runnable field = null;
+
+		@java.lang.SuppressWarnings("all")
+		public void run() {
+			this.field.run();
+		}
+	}
+
+
+	static class StaticClass {
+		private final java.lang.Runnable field = null;
+
+		@java.lang.SuppressWarnings("all")
+		public void run() {
+			this.field.run();
+		}
+	}
+}

test/transform/resource/before/DelegateOnLocalClass.java → test/transform/resource/before/DelegateInNestedClass.java

@@ -1,19 +1,24 @@
 //platform !eclipse: Requires a 'full' eclipse with intialized workspace, and we don't (yet) have that set up properly in the test run.
-//skip compare content
-//ignore: crashed javac with NPE, should be enabled when that bug is fixed
 import lombok.experimental.Delegate;
-import lombok.Getter;
 
-interface DelegateOnLocalClass {
-	void test1() {
-		class DelegateOnStatic {
+class DelegateInNestedClass {
+	void localClass() {
+		class LocalClass {
 			@Delegate private final java.lang.Runnable field = null;
 		}
 	}
 
-	void test2() {
+	void anonymousClass() {
 		Runnable r = new Runnable() {
 			@Delegate private final java.lang.Runnable field = null;
-		}
+		};
+	}
+
+	class InnerClass {
+		@Delegate private final java.lang.Runnable field = null;
+	}
+
+	static class StaticClass {
+		@Delegate private final java.lang.Runnable field = null;
 	}
 }