[fixes #3931] Proper output for config tool addNullAnnotations

src/core/lombok/core/configuration/NullAnnotationLibrary.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020-2023 The Project Lombok Authors.
+ * Copyright (C) 2020-2025 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
@@ -156,4 +156,8 @@ public final class NullAnnotationLibrary implements ConfigurationValueType {
 		if (atStart) throw new IllegalArgumentException(MSG + fqn);
 		return fqn;
 	}
+	
+	@Override public String toString() {
+		return key;
+	}
 }

test/configuration/resource/configurationRoot/features/annotations/lombok.config

@@ -0,0 +1,3 @@
+config.stopBubbling=true
+
+lombok.addNullAnnotations = jspecify

test/configuration/resource/configurationRoot/out.txt

@@ -32,6 +32,9 @@ lombok.copyableAnnotations += copy1
 # BASE/d1/d11/lombok.config (stopped bubbling):
 #    7: lombok.copyableAnnotations += copy1
 
+# Generate some style of null annotation for generated code where this is relevant. (default: none).
+clear lombok.addNullAnnotations
+
 
 Configuration for:
 - BASE/d1/d11/d111
@@ -101,6 +104,9 @@ lombok.copyableAnnotations += copy2
 # BASE/d1/d11/d111/lombok.config:
 #    5: lombok.copyableAnnotations += copy2
 
+# Generate some style of null annotation for generated code where this is relevant. (default: none).
+clear lombok.addNullAnnotations
+
 
 Configuration for 'BASE/d1/d12'.
 
@@ -129,3 +135,38 @@ clear lombok.log.fieldName
 
 # Copy these annotations to getters, setters, with methods, builder-setters, etc.
 clear lombok.copyableAnnotations
+
+# Generate some style of null annotation for generated code where this is relevant. (default: none).
+clear lombok.addNullAnnotations
+
+
+Configuration for 'BASE/features/annotations'.
+
+# Emit a warning or error if @Accessors is used.
+clear lombok.accessors.flagUsage
+
+# Generate setters that return 'this' instead of 'void' (default: false).
+clear lombok.accessors.chain
+
+# Strip this field prefix, like 'f' or 'm_', from the names of generated getters, setters, and with-ers.
+clear lombok.accessors.prefix
+
+# Generate @javax.annotation.Generated on all generated code (default: false). Deprecated, use 'lombok.addJavaxGeneratedAnnotation' instead.
+clear lombok.addGeneratedAnnotation
+
+# Generate @javax.annotation.Generated on all generated code (default: follow lombok.addGeneratedAnnotation).
+clear lombok.addJavaxGeneratedAnnotation
+
+# Generate @ConstructorProperties for generated constructors (default: false).
+clear lombok.anyConstructor.addConstructorProperties
+
+# Use this name for the generated logger fields (default: 'log').
+clear lombok.log.fieldName
+
+# Copy these annotations to getters, setters, with methods, builder-setters, etc.
+clear lombok.copyableAnnotations
+
+# Generate some style of null annotation for generated code where this is relevant. (default: none).
+lombok.addNullAnnotations = jspecify
+# BASE/features/annotations/lombok.config (stopped bubbling):
+#    3: lombok.addNullAnnotations = jspecify

test/configuration/src/lombok/core/configuration/TestConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2014-2020 The Project Lombok Authors.
+ * Copyright (C) 2014-2025 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
@@ -40,12 +40,12 @@ public class TestConfiguration {
 	public void testDisplayVerbose() throws Exception {
 		
 		@SuppressWarnings(value = {"all", "unchecked", "deprecation"})
-		Collection<ConfigurationKey<?>> keys = Arrays.asList(ACCESSORS_FLAG_USAGE, ACCESSORS_CHAIN, ACCESSORS_PREFIX, ADD_GENERATED_ANNOTATIONS, ADD_JAVAX_GENERATED_ANNOTATIONS, ANY_CONSTRUCTOR_ADD_CONSTRUCTOR_PROPERTIES, LOG_ANY_FIELD_NAME, COPYABLE_ANNOTATIONS);
+		Collection<ConfigurationKey<?>> keys = Arrays.asList(ACCESSORS_FLAG_USAGE, ACCESSORS_CHAIN, ACCESSORS_PREFIX, ADD_GENERATED_ANNOTATIONS, ADD_JAVAX_GENERATED_ANNOTATIONS, ANY_CONSTRUCTOR_ADD_CONSTRUCTOR_PROPERTIES, LOG_ANY_FIELD_NAME, COPYABLE_ANNOTATIONS, ADD_NULL_ANNOTATIONS);
 		
 		String baseName = "test/configuration/resource/configurationRoot/";
 		File directory = new File(baseName);
 		String normalizedName = new File(directory.getAbsoluteFile().toURI().normalize()).toString().replace('\\', '/') + "/";
-		Collection<String> paths = Arrays.asList(normalizedName + "d1/d11", normalizedName + "d1/d12", normalizedName + "d1/d11/d111", normalizedName + "d1/d11/d111/f1.txt");
+		Collection<String> paths = Arrays.asList(normalizedName + "d1/d11", normalizedName + "d1/d12", normalizedName + "d1/d11/d111", normalizedName + "d1/d11/d111/f1.txt", normalizedName + "features/annotations");
 		
 		ByteArrayOutputStream rawOut = new ByteArrayOutputStream();
 		ByteArrayOutputStream rawErr = new ByteArrayOutputStream();