Added confkey to make @NonNull generate a different exception because of the IllegalArgumentException vs. NullPointerException that we really don’t want to get into.

doc/changelog.markdown

@@ -2,6 +2,7 @@ Lombok Changelog
 ----------------
 
 ### v1.12.7 "Edgy Guinea Pig"
+* FEATURE: You can now configure aspects of lombok project wide (or even workspace wide, or just for a single package) via the [configuration system](http://projectlombok.org/features/configuration.html). You can configure many things; run `java -jar lombok.jar config -gv` for the complete list.
 * DEPRECATION: `@Delegate` has been moved to `lombok.experimental.Delegate`, and corner cases such as recursive delegation (delegating a type that itself has fields or methods annotated with `@Delegate`) are now error conditions. See the [feature documentation](http://projectlombok.org/features/experimental/Delegate.html) for more information.
 * FEATURE: It is now possible to put annotations, such as `@Nullable`, on the one parameter of generated `equals()` methods by specifying the `onParam=` option on `@EqualsAndHashCode`, similar to how that feature already exists for `@Setter`. [Issue #674](https://code.google.com/p/projectlombok/issues/detail?id=674)
 * CHANGE: suppressConstructorProperties should now be configured via lombok configuration. [Issue #659](https://code.google.com/p/projectlombok/issues/detail?id=659)

src/core/lombok/ConfigurationKeys.java

@@ -180,6 +180,13 @@ public class ConfigurationKeys {
 	
 	// ----- NonNull -----
 	
+	/**
+	 * lombok configuration: {@code lombok.nonNull.exceptionType} = &lt;String: <em>a java exception type, such as {@code java.lang.IllegalArgumentException}</em>&gt; (default: {@code java.lang.NullPointerException}).
+	 * 
+	 * Sets the exception to throw if {@code @NonNull} is applied to a method parameter, and a caller passes in {@code null}.
+	 */
+	public static final ConfigurationKey<String> NON_NULL_EXCEPTION_TYPE = new ConfigurationKey<String>("lombok.nonNull.exceptionType", "The type of the exception to throw if a passed-in argument is null.") {};
+	
 	/**
 	 * lombok configuration: {@code lombok.nonNull.flagUsage} = {@code WARNING} | {@code ERROR}.
 	 * 
@@ -269,7 +276,7 @@ public class ConfigurationKeys {
 	public static final ConfigurationKey<FlagUsageType> LOG_XSLF4J_FLAG_USAGE = new ConfigurationKey<FlagUsageType>("lombok.log.xslf4j.flagUsage", "Emit a warning or error if @XSlf4j is used.") {};
 	
 	/**
-	 * lombok configuration: {@code lombok.log.fieldName} = "aJavaIdentifier".
+	 * lombok configuration: {@code lombok.log.fieldName} = &lt;String: aJavaIdentifier&gt; (Default: {@code log}).
 	 * 
 	 * If set the various log annotations (which make a log field) will use the stated identifier instead of {@code log} as a name.
 	 */

src/core/lombok/core/handlers/HandlerUtil.java

@@ -68,6 +68,30 @@ public class HandlerUtil {
 		return 97;
 	}
 	
+	/** Checks if the input is a valid class reference (not a primitive and does not have generics). */
+	public static boolean isLegalBasicClassReference(String in) {
+		boolean atStartOfIdentifier = true;
+		
+		for (int i = 0; i < in.length(); i++) {
+			char c = in.charAt(i);
+			
+			if (atStartOfIdentifier) {
+				if (!Character.isJavaIdentifierStart(c)) return false;
+				atStartOfIdentifier = false;
+				continue;
+			}
+			
+			if (c == '.') {
+				atStartOfIdentifier = true;
+				continue;
+			}
+			
+			if (!Character.isJavaIdentifierPart(c)) return false;
+		}
+		
+		return !atStartOfIdentifier;
+	}
+	
 	/** Checks if the given name is a valid identifier.
 	 * 
 	 * If it is, this returns {@code true} and does nothing else.
@@ -204,6 +228,8 @@ public class HandlerUtil {
 	/** Matches the simple part of any annotation that lombok considers as indicative of Nullable status. */
 	public static final Pattern NULLABLE_PATTERN = Pattern.compile("^(?:nullable|checkfornull)$", Pattern.CASE_INSENSITIVE);
 	
+	public static final String DEFAULT_EXCEPTION_FOR_NON_NULL = "java.lang.NullPointerException";
+	
 	/**
 	 * Generates a getter name from a given field name.
 	 * 

src/core/lombok/eclipse/handlers/EclipseHandlerUtil.java

@@ -1396,17 +1396,35 @@ public class EclipseHandlerUtil {
 	}
 	
 	/**
-	 * Generates a new statement that checks if the given variable is null, and if so, throws a {@code NullPointerException} with the
+	 * Generates a new statement that checks if the given variable is null, and if so, throws a specified exception with the
 	 * variable name as message.
+	 * 
+	 * @param exName The name of the exception to throw; normally {@code java.lang.NullPointerException}.
 	 */
-	public static Statement generateNullCheck(AbstractVariableDeclaration variable, ASTNode source) {
+	public static Statement generateNullCheck(AbstractVariableDeclaration variable, EclipseNode sourceNode) {
+		String exceptionType = sourceNode.getAst().readConfiguration(ConfigurationKeys.NON_NULL_EXCEPTION_TYPE);
+		if (exceptionType == null) {
+			exceptionType = HandlerUtil.DEFAULT_EXCEPTION_FOR_NON_NULL;
+		} else {
+			if (!HandlerUtil.isLegalBasicClassReference(exceptionType)) {
+				sourceNode.addWarning("Configuration key contains invalid java type reference '" + exceptionType + "'; use something like 'java.lang.NullPointerException' as value for this key.");
+				exceptionType = HandlerUtil.DEFAULT_EXCEPTION_FOR_NON_NULL;
+			}
+		}
+		
+		ASTNode source = sourceNode.get();
+		
 		int pS = source.sourceStart, pE = source.sourceEnd;
 		long p = (long)pS << 32 | pE;
 		
 		if (isPrimitive(variable.type)) return null;
 		AllocationExpression exception = new AllocationExpression();
 		setGeneratedBy(exception, source);
-		exception.type = new QualifiedTypeReference(fromQualifiedName("java.lang.NullPointerException"), new long[]{p, p, p});
+		int partCount = 0;
+		for (int i = 0; i < exceptionType.length(); i++) if (exceptionType.charAt(i) == '.') partCount++;
+		long[] ps = new long[partCount];
+		Arrays.fill(ps, 0L);
+		exception.type = new QualifiedTypeReference(fromQualifiedName(exceptionType), ps);
 		setGeneratedBy(exception.type, source);
 		exception.arguments = new Expression[] { new StringLiteral(variable.name, pS, pE, 0)};
 		setGeneratedBy(exception.arguments[0], source);

src/core/lombok/eclipse/handlers/HandleBuilder.java

@@ -120,7 +120,8 @@ public class HandleBuilder extends EclipseAnnotationHandler<Builder> {
 				fields.add(fieldNode);
 			}
 			
-			new HandleConstructor().generateConstructor(tdParent, AccessLevel.PACKAGE, fields, null, SkipIfConstructorExists.I_AM_BUILDER, null, Collections.<Annotation>emptyList(), ast);
+			new HandleConstructor().generateConstructor(tdParent, AccessLevel.PACKAGE, fields, null, SkipIfConstructorExists.I_AM_BUILDER, null,
+					Collections.<Annotation>emptyList(), annotationNode);
 			
 			returnType = namePlusTypeParamsToTypeReference(td.name, td.typeParameters, p);
 			typeParams = td.typeParameters;
@@ -204,12 +205,14 @@ public class HandleBuilder extends EclipseAnnotationHandler<Builder> {
 		List<EclipseNode> fieldNodes = addFieldsToBuilder(builderType, namesOfParameters, typesOfParameters, ast);
 		List<AbstractMethodDeclaration> newMethods = new ArrayList<AbstractMethodDeclaration>();
 		for (EclipseNode fieldNode : fieldNodes) {
-			MethodDeclaration newMethod = makeSetterMethodForBuilder(builderType, fieldNode, ast, builderInstance.fluent(), builderInstance.chain());
+			MethodDeclaration newMethod = makeSetterMethodForBuilder(builderType, fieldNode, annotationNode, builderInstance.fluent(), builderInstance.chain());
 			if (newMethod != null) newMethods.add(newMethod);
 		}
 		
 		if (constructorExists(builderType) == MemberExistsResult.NOT_EXISTS) {
-			ConstructorDeclaration cd = HandleConstructor.createConstructor(AccessLevel.PACKAGE, builderType, Collections.<EclipseNode>emptyList(), null, ast, Collections.<Annotation>emptyList());
+			ConstructorDeclaration cd = HandleConstructor.createConstructor(
+					AccessLevel.PACKAGE, builderType, Collections.<EclipseNode>emptyList(), null,
+					annotationNode, Collections.<Annotation>emptyList());
 			if (cd != null) injectMethod(builderType, cd);
 		}
 		
@@ -334,7 +337,7 @@ public class HandleBuilder extends EclipseAnnotationHandler<Builder> {
 	
 	private static final AbstractMethodDeclaration[] EMPTY = {};
 	
-	public MethodDeclaration makeSetterMethodForBuilder(EclipseNode builderType, EclipseNode fieldNode, ASTNode source, boolean fluent, boolean chain) {
+	public MethodDeclaration makeSetterMethodForBuilder(EclipseNode builderType, EclipseNode fieldNode, EclipseNode sourceNode, boolean fluent, boolean chain) {
 		TypeDeclaration td = (TypeDeclaration) builderType.get();
 		AbstractMethodDeclaration[] existing = td.methods;
 		if (existing == null) existing = EMPTY;
@@ -352,7 +355,7 @@ public class HandleBuilder extends EclipseAnnotationHandler<Builder> {
 		String setterName = fluent ? fieldNode.getName() : toSetterName(builderType.getAst(), null, fieldNode.getName(), isBoolean);
 		
 		return HandleSetter.createSetter(td, fieldNode, setterName, chain, ClassFileConstants.AccPublic,
-				source, Collections.<Annotation>emptyList(), Collections.<Annotation>emptyList());
+				sourceNode, Collections.<Annotation>emptyList(), Collections.<Annotation>emptyList());
 	}
 	
 	public EclipseNode findInnerClass(EclipseNode parent, String name) {

src/core/lombok/eclipse/handlers/HandleConstructor.java

@@ -82,7 +82,7 @@ public class HandleConstructor {
 			
 			List<Annotation> onConstructor = unboxAndRemoveAnnotationParameter(ast, "onConstructor", "@NoArgsConstructor(onConstructor=", annotationNode);
 			
-			new HandleConstructor().generateConstructor(typeNode, level, fields, staticName, SkipIfConstructorExists.NO, null, onConstructor, ast);
+			new HandleConstructor().generateConstructor(typeNode, level, fields, staticName, SkipIfConstructorExists.NO, null, onConstructor, annotationNode);
 		}
 	}
 	
@@ -106,7 +106,9 @@ public class HandleConstructor {
 			
 			List<Annotation> onConstructor = unboxAndRemoveAnnotationParameter(ast, "onConstructor", "@RequiredArgsConstructor(onConstructor=", annotationNode);
 			
-			new HandleConstructor().generateConstructor(typeNode, level, findRequiredFields(typeNode), staticName, SkipIfConstructorExists.NO, suppressConstructorProperties, onConstructor, ast);
+			new HandleConstructor().generateConstructor(
+					typeNode, level, findRequiredFields(typeNode), staticName, SkipIfConstructorExists.NO,
+					suppressConstructorProperties, onConstructor, annotationNode);
 		}
 	}
 	
@@ -158,7 +160,9 @@ public class HandleConstructor {
 			
 			List<Annotation> onConstructor = unboxAndRemoveAnnotationParameter(ast, "onConstructor", "@AllArgsConstructor(onConstructor=", annotationNode);
 			
-			new HandleConstructor().generateConstructor(typeNode, level, findAllFields(typeNode), staticName, SkipIfConstructorExists.NO, suppressConstructorProperties, onConstructor, ast);
+			new HandleConstructor().generateConstructor(
+					typeNode, level, findAllFields(typeNode), staticName, SkipIfConstructorExists.NO,
+					suppressConstructorProperties, onConstructor, annotationNode);
 		}
 	}
 	
@@ -176,19 +180,29 @@ public class HandleConstructor {
 		return true;
 	}
 	
-	public void generateRequiredArgsConstructor(EclipseNode typeNode, AccessLevel level, String staticName, SkipIfConstructorExists skipIfConstructorExists, List<Annotation> onConstructor, ASTNode source) {
-		generateConstructor(typeNode, level, findRequiredFields(typeNode), staticName, skipIfConstructorExists, null, onConstructor, source);
+	public void generateRequiredArgsConstructor(
+			EclipseNode typeNode, AccessLevel level, String staticName, SkipIfConstructorExists skipIfConstructorExists,
+			List<Annotation> onConstructor, EclipseNode sourceNode) {
+		
+		generateConstructor(typeNode, level, findRequiredFields(typeNode), staticName, skipIfConstructorExists, null, onConstructor, sourceNode);
 	}
 	
-	public void generateAllArgsConstructor(EclipseNode typeNode, AccessLevel level, String staticName, SkipIfConstructorExists skipIfConstructorExists, List<Annotation> onConstructor, ASTNode source) {
-		generateConstructor(typeNode, level, findAllFields(typeNode), staticName, skipIfConstructorExists, null, onConstructor, source);
+	public void generateAllArgsConstructor(
+			EclipseNode typeNode, AccessLevel level, String staticName, SkipIfConstructorExists skipIfConstructorExists,
+			List<Annotation> onConstructor, EclipseNode sourceNode) {
+		
+		generateConstructor(typeNode, level, findAllFields(typeNode), staticName, skipIfConstructorExists, null, onConstructor, sourceNode);
 	}
 	
 	public enum SkipIfConstructorExists {
 		YES, NO, I_AM_BUILDER;
 	}
 	
-	public void generateConstructor(EclipseNode typeNode, AccessLevel level, List<EclipseNode> fields, String staticName, SkipIfConstructorExists skipIfConstructorExists, Boolean suppressConstructorProperties, List<Annotation> onConstructor, ASTNode source) {
+	public void generateConstructor(
+			EclipseNode typeNode, AccessLevel level, List<EclipseNode> fields, String staticName, SkipIfConstructorExists skipIfConstructorExists,
+			Boolean suppressConstructorProperties, List<Annotation> onConstructor, EclipseNode sourceNode) {
+		
+		ASTNode source = sourceNode.get();
 		boolean staticConstrRequired = staticName != null && !staticName.equals("");
 		
 		if (skipIfConstructorExists != SkipIfConstructorExists.NO && constructorExists(typeNode) != MemberExistsResult.NOT_EXISTS) return;
@@ -209,7 +223,9 @@ public class HandleConstructor {
 							// will take care of it. However, @Data also wants a specific static name; this will be ignored; the appropriate way to do this is to use
 							// the 'staticName' parameter of the @XArgsConstructor you've stuck on your type.
 							// We should warn that we're ignoring @Data's 'staticConstructor' param.
-							typeNode.addWarning("Ignoring static constructor name: explicit @XxxArgsConstructor annotation present; its `staticName` parameter will be used.", source.sourceStart, source.sourceEnd);
+							typeNode.addWarning(
+									"Ignoring static constructor name: explicit @XxxArgsConstructor annotation present; its `staticName` parameter will be used.",
+									source.sourceStart, source.sourceEnd);
 						}
 						return;
 					}
@@ -217,7 +233,9 @@ public class HandleConstructor {
 			}
 		}
 		
-		ConstructorDeclaration constr = createConstructor(staticConstrRequired ? AccessLevel.PRIVATE : level, typeNode, fields, suppressConstructorProperties, source, onConstructor);
+		ConstructorDeclaration constr = createConstructor(
+				staticConstrRequired ? AccessLevel.PRIVATE : level, typeNode, fields,
+				suppressConstructorProperties, sourceNode, onConstructor);
 		injectMethod(typeNode, constr);
 		if (staticConstrRequired) {
 			MethodDeclaration staticConstr = createStaticConstructor(level, staticName, typeNode, fields, source);
@@ -259,8 +277,9 @@ public class HandleConstructor {
 	
 	public static ConstructorDeclaration createConstructor(
 			AccessLevel level, EclipseNode type, Collection<EclipseNode> fields,
-			Boolean suppressConstructorProperties, ASTNode source, List<Annotation> onConstructor) {
+			Boolean suppressConstructorProperties, EclipseNode sourceNode, List<Annotation> onConstructor) {
 		
+		ASTNode source = sourceNode.get();
 		TypeDeclaration typeDeclaration = ((TypeDeclaration)type.get());
 		long p = (long)source.sourceStart << 32 | source.sourceEnd;
 		
@@ -311,7 +330,7 @@ public class HandleConstructor {
 			Annotation[] nonNulls = findAnnotations(field, NON_NULL_PATTERN);
 			Annotation[] nullables = findAnnotations(field, NULLABLE_PATTERN);
 			if (nonNulls.length != 0) {
-				Statement nullCheck = generateNullCheck(field, source);
+				Statement nullCheck = generateNullCheck(field, sourceNode);
 				if (nullCheck != null) nullChecks.add(nullCheck);
 			}
 			Annotation[] copiedAnnotations = copyAnnotations(source, nonNulls, nullables);

src/core/lombok/eclipse/handlers/HandleData.java

@@ -70,6 +70,8 @@ public class HandleData extends EclipseAnnotationHandler<Data> {
 		new HandleSetter().generateSetterForType(typeNode, annotationNode, AccessLevel.PUBLIC, true);
 		new HandleEqualsAndHashCode().generateEqualsAndHashCodeForType(typeNode, annotationNode);
 		new HandleToString().generateToStringForType(typeNode, annotationNode);
-		new HandleConstructor().generateRequiredArgsConstructor(typeNode, AccessLevel.PUBLIC, ann.staticConstructor(), SkipIfConstructorExists.YES, Collections.<Annotation>emptyList(), ast);
+		new HandleConstructor().generateRequiredArgsConstructor(
+				typeNode, AccessLevel.PUBLIC, ann.staticConstructor(), SkipIfConstructorExists.YES,
+				Collections.<Annotation>emptyList(), annotationNode);
 	}
 }

src/core/lombok/eclipse/handlers/HandleNonNull.java

@@ -99,7 +99,7 @@ public class HandleNonNull extends EclipseAnnotationHandler<NonNull> {
 		// and if they exist, create a new method in the class: 'private static <T> T lombok$nullCheck(T expr, String msg) {if (expr == null) throw NPE; return expr;}' and
 		// wrap all references to it in the super/this to a call to this method.
 		
-		Statement nullCheck = generateNullCheck(arg, ast);
+		Statement nullCheck = generateNullCheck(arg, annotationNode);
 		
 		if (nullCheck == null) {
 			// @NonNull applied to a primitive. Kinda pointless. Let's generate a warning.

src/core/lombok/eclipse/handlers/HandleSetter.java

@@ -90,7 +90,7 @@ public class HandleSetter extends EclipseAnnotationHandler<Setter> {
 			//Skip final fields.
 			if ((fieldDecl.modifiers & ClassFileConstants.AccFinal) != 0) continue;
 			
-			generateSetterForField(field, pos.get(), level);
+			generateSetterForField(field, pos, level);
 		}
 		return true;
 	}
@@ -107,7 +107,7 @@ public class HandleSetter extends EclipseAnnotationHandler<Setter> {
 	 * If not, the setter is still generated if it isn't already there, though there will not
 	 * be a warning if its already there. The default access level is used.
 	 */
-	public void generateSetterForField(EclipseNode fieldNode, ASTNode pos, AccessLevel level) {
+	public void generateSetterForField(EclipseNode fieldNode, EclipseNode sourceNode, AccessLevel level) {
 		if (hasAnnotation(Setter.class, fieldNode)) {
 			//The annotation will make it happen, so we can skip it.
 			return;
@@ -115,7 +115,7 @@ public class HandleSetter extends EclipseAnnotationHandler<Setter> {
 		
 		List<Annotation> empty = Collections.emptyList();
 		
-		createSetterForField(level, fieldNode, fieldNode, pos, false, empty, empty);
+		createSetterForField(level, fieldNode, sourceNode, false, empty, empty);
 	}
 	
 	public void handle(AnnotationValues<Setter> annotation, Annotation ast, EclipseNode annotationNode) {
@@ -130,7 +130,7 @@ public class HandleSetter extends EclipseAnnotationHandler<Setter> {
 		
 		switch (node.getKind()) {
 		case FIELD:
-			createSetterForFields(level, annotationNode.upFromAnnotationToFields(), annotationNode, annotationNode.get(), true, onMethod, onParam);
+			createSetterForFields(level, annotationNode.upFromAnnotationToFields(), annotationNode, true, onMethod, onParam);
 			break;
 		case TYPE:
 			if (!onMethod.isEmpty()) {
@@ -144,19 +144,20 @@ public class HandleSetter extends EclipseAnnotationHandler<Setter> {
 		}
 	}
 	
-	public void createSetterForFields(AccessLevel level, Collection<EclipseNode> fieldNodes, EclipseNode errorNode, ASTNode source, boolean whineIfExists, List<Annotation> onMethod, List<Annotation> onParam) {
+	public void createSetterForFields(AccessLevel level, Collection<EclipseNode> fieldNodes, EclipseNode sourceNode, boolean whineIfExists, List<Annotation> onMethod, List<Annotation> onParam) {
 		for (EclipseNode fieldNode : fieldNodes) {
-			createSetterForField(level, fieldNode, errorNode, source, whineIfExists, onMethod, onParam);
+			createSetterForField(level, fieldNode, sourceNode, whineIfExists, onMethod, onParam);
 		}
 	}
 	
 	public void createSetterForField(
-			AccessLevel level, EclipseNode fieldNode, EclipseNode errorNode,
-			ASTNode source, boolean whineIfExists, List<Annotation> onMethod,
+			AccessLevel level, EclipseNode fieldNode, EclipseNode sourceNode,
+			boolean whineIfExists, List<Annotation> onMethod,
 			List<Annotation> onParam) {
 		
+		ASTNode source = sourceNode.get();
 		if (fieldNode.getKind() != Kind.FIELD) {
-			errorNode.addError("@Setter is only supported on a class or a field.");
+			sourceNode.addError("@Setter is only supported on a class or a field.");
 			return;
 		}
 		
@@ -167,7 +168,7 @@ public class HandleSetter extends EclipseAnnotationHandler<Setter> {
 		boolean shouldReturnThis = shouldReturnThis(fieldNode);
 		
 		if (setterName == null) {
-			errorNode.addWarning("Not generating setter for this field: It does not fit your @Accessors prefix list.");
+			fieldNode.addWarning("Not generating setter for this field: It does not fit your @Accessors prefix list.");
 			return;
 		}
 		
@@ -181,7 +182,7 @@ public class HandleSetter extends EclipseAnnotationHandler<Setter> {
 				if (whineIfExists) {
 					String altNameExpl = "";
 					if (!altName.equals(setterName)) altNameExpl = String.format(" (%s)", altName);
-					errorNode.addWarning(
+					fieldNode.addWarning(
 						String.format("Not generating %s(): A method with that name already exists%s", setterName, altNameExpl));
 				}
 				return;
@@ -191,12 +192,13 @@ public class HandleSetter extends EclipseAnnotationHandler<Setter> {
 			}
 		}
 		
-		MethodDeclaration method = createSetter((TypeDeclaration) fieldNode.up().get(), fieldNode, setterName, shouldReturnThis, modifier, source, onMethod, onParam);
+		MethodDeclaration method = createSetter((TypeDeclaration) fieldNode.up().get(), fieldNode, setterName, shouldReturnThis, modifier, sourceNode, onMethod, onParam);
 		injectMethod(fieldNode.up(), method);
 	}
 	
-	static MethodDeclaration createSetter(TypeDeclaration parent, EclipseNode fieldNode, String name, boolean shouldReturnThis, int modifier, ASTNode source, List<Annotation> onMethod, List<Annotation> onParam) {
+	static MethodDeclaration createSetter(TypeDeclaration parent, EclipseNode fieldNode, String name, boolean shouldReturnThis, int modifier, EclipseNode sourceNode, List<Annotation> onMethod, List<Annotation> onParam) {
 		FieldDeclaration field = (FieldDeclaration) fieldNode.get();
+		ASTNode source = sourceNode.get();
 		int pS = source.sourceStart, pE = source.sourceEnd;
 		long p = (long)pS << 32 | pE;
 		MethodDeclaration method = new MethodDeclaration(parent.compilationResult);
@@ -239,7 +241,7 @@ public class HandleSetter extends EclipseAnnotationHandler<Setter> {
 		if (nonNulls.length == 0) {
 			statements.add(assignment);
 		} else {
-			Statement nullCheck = generateNullCheck(field, source);
+			Statement nullCheck = generateNullCheck(field, sourceNode);
 			if (nullCheck != null) statements.add(nullCheck);
 			statements.add(assignment);
 		}

src/core/lombok/eclipse/handlers/HandleValue.java

@@ -83,6 +83,7 @@ public class HandleValue extends EclipseAnnotationHandler<Value> {
 		new HandleGetter().generateGetterForType(typeNode, annotationNode, AccessLevel.PUBLIC, true);
 		new HandleEqualsAndHashCode().generateEqualsAndHashCodeForType(typeNode, annotationNode);
 		new HandleToString().generateToStringForType(typeNode, annotationNode);
-		new HandleConstructor().generateAllArgsConstructor(typeNode, AccessLevel.PUBLIC, ann.staticConstructor(), SkipIfConstructorExists.YES, Collections.<Annotation>emptyList(), ast);
+		new HandleConstructor().generateAllArgsConstructor(typeNode, AccessLevel.PUBLIC, ann.staticConstructor(), SkipIfConstructorExists.YES,
+				Collections.<Annotation>emptyList(), annotationNode);
 	}
 }

src/core/lombok/eclipse/handlers/HandleWither.java

@@ -88,7 +88,7 @@ public class HandleWither extends EclipseAnnotationHandler<Wither> {
 			//Skip final fields.
 			if ((fieldDecl.modifiers & ClassFileConstants.AccFinal) != 0 && fieldDecl.initialization != null) continue;
 			
-			generateWitherForField(field, pos.get(), level);
+			generateWitherForField(field, pos, level);
 		}
 		return true;
 	}
@@ -106,7 +106,7 @@ public class HandleWither extends EclipseAnnotationHandler<Wither> {
 	 * If not, the wither is still generated if it isn't already there, though there will not
 	 * be a warning if its already there. The default access level is used.
 	 */
-	public void generateWitherForField(EclipseNode fieldNode, ASTNode pos, AccessLevel level) {
+	public void generateWitherForField(EclipseNode fieldNode, EclipseNode sourceNode, AccessLevel level) {
 		for (EclipseNode child : fieldNode.down()) {
 			if (child.getKind() == Kind.ANNOTATION) {
 				if (annotationTypeMatches(Wither.class, child)) {
@@ -117,7 +117,7 @@ public class HandleWither extends EclipseAnnotationHandler<Wither> {
 		}
 		
 		List<Annotation> empty = Collections.emptyList();
-		createWitherForField(level, fieldNode, fieldNode, pos, false, empty, empty);
+		createWitherForField(level, fieldNode, sourceNode, false, empty, empty);
 	}
 	
 	@Override public void handle(AnnotationValues<Wither> annotation, Annotation ast, EclipseNode annotationNode) {
@@ -132,7 +132,7 @@ public class HandleWither extends EclipseAnnotationHandler<Wither> {
 		
 		switch (node.getKind()) {
 		case FIELD:
-			createWitherForFields(level, annotationNode.upFromAnnotationToFields(), annotationNode, annotationNode.get(), true, onMethod, onParam);
+			createWitherForFields(level, annotationNode.upFromAnnotationToFields(), annotationNode, true, onMethod, onParam);
 			break;
 		case TYPE:
 			if (!onMethod.isEmpty()) {
@@ -146,18 +146,20 @@ public class HandleWither extends EclipseAnnotationHandler<Wither> {
 		}
 	}
 	
-	public void createWitherForFields(AccessLevel level, Collection<EclipseNode> fieldNodes, EclipseNode errorNode, ASTNode source, boolean whineIfExists, List<Annotation> onMethod, List<Annotation> onParam) {
+	public void createWitherForFields(AccessLevel level, Collection<EclipseNode> fieldNodes, EclipseNode sourceNode, boolean whineIfExists, List<Annotation> onMethod, List<Annotation> onParam) {
 		for (EclipseNode fieldNode : fieldNodes) {
-			createWitherForField(level, fieldNode, errorNode, source, whineIfExists, onMethod, onParam);
+			createWitherForField(level, fieldNode, sourceNode, whineIfExists, onMethod, onParam);
 		}
 	}
 	
 	public void createWitherForField(
-			AccessLevel level, EclipseNode fieldNode, EclipseNode errorNode,
-			ASTNode source, boolean whineIfExists, List<Annotation> onMethod,
+			AccessLevel level, EclipseNode fieldNode, EclipseNode sourceNode,
+			boolean whineIfExists, List<Annotation> onMethod,
 			List<Annotation> onParam) {
+		
+		ASTNode source = sourceNode.get();
 		if (fieldNode.getKind() != Kind.FIELD) {
-			errorNode.addError("@Wither is only supported on a class or a field.");
+			sourceNode.addError("@Wither is only supported on a class or a field.");
 			return;
 		}
 		
@@ -167,22 +169,22 @@ public class HandleWither extends EclipseAnnotationHandler<Wither> {
 		String witherName = toWitherName(fieldNode, isBoolean);
 		
 		if (witherName == null) {
-			errorNode.addWarning("Not generating wither for this field: It does not fit your @Accessors prefix list.");
+			fieldNode.addWarning("Not generating wither for this field: It does not fit your @Accessors prefix list.");
 			return;
 		}
 		
 		if ((field.modifiers & ClassFileConstants.AccStatic) != 0) {
-			errorNode.addWarning("Not generating wither for this field: Withers cannot be generated for static fields.");
+			fieldNode.addWarning("Not generating wither for this field: Withers cannot be generated for static fields.");
 			return;
 		}
 		
 		if ((field.modifiers & ClassFileConstants.AccFinal) != 0 && field.initialization != null) {
-			errorNode.addWarning("Not generating wither for this field: Withers cannot be generated for final, initialized fields.");
+			fieldNode.addWarning("Not generating wither for this field: Withers cannot be generated for final, initialized fields.");
 			return;
 		}
 		
 		if (field.name != null && field.name.length > 0 && field.name[0] == '$') {
-			errorNode.addWarning("Not generating wither for this field: Withers cannot be generated for fields starting with $.");
+			fieldNode.addWarning("Not generating wither for this field: Withers cannot be generated for fields starting with $.");
 			return;
 		}
 		
@@ -194,7 +196,7 @@ public class HandleWither extends EclipseAnnotationHandler<Wither> {
 				if (whineIfExists) {
 					String altNameExpl = "";
 					if (!altName.equals(witherName)) altNameExpl = String.format(" (%s)", altName);
-					errorNode.addWarning(
+					fieldNode.addWarning(
 						String.format("Not generating %s(): A method with that name already exists%s", witherName, altNameExpl));
 				}
 				return;
@@ -206,11 +208,12 @@ public class HandleWither extends EclipseAnnotationHandler<Wither> {
 		
 		int modifier = toEclipseModifier(level);
 		
-		MethodDeclaration method = createWither((TypeDeclaration) fieldNode.up().get(), fieldNode, witherName, modifier, source, onMethod, onParam);
+		MethodDeclaration method = createWither((TypeDeclaration) fieldNode.up().get(), fieldNode, witherName, modifier, sourceNode, onMethod, onParam);
 		injectMethod(fieldNode.up(), method);
 	}
 	
-	public MethodDeclaration createWither(TypeDeclaration parent, EclipseNode fieldNode, String name, int modifier, ASTNode source, List<Annotation> onMethod, List<Annotation> onParam) {
+	public MethodDeclaration createWither(TypeDeclaration parent, EclipseNode fieldNode, String name, int modifier, EclipseNode sourceNode, List<Annotation> onMethod, List<Annotation> onParam) {
+		ASTNode source = sourceNode.get();
 		if (name == null) return null;
 		FieldDeclaration field = (FieldDeclaration) fieldNode.get();
 		int pS = source.sourceStart, pE = source.sourceEnd;
@@ -273,7 +276,7 @@ public class HandleWither extends EclipseAnnotationHandler<Wither> {
 		Annotation[] nullables = findAnnotations(field, NULLABLE_PATTERN);
 		List<Statement> statements = new ArrayList<Statement>(5);
 		if (nonNulls.length > 0) {
-			Statement nullCheck = generateNullCheck(field, source);
+			Statement nullCheck = generateNullCheck(field, sourceNode);
 			if (nullCheck != null) statements.add(nullCheck);
 		}
 		statements.add(returnStatement);

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

@@ -194,12 +194,12 @@ public class HandleBuilder extends JavacAnnotationHandler<Builder> {
 		java.util.List<JavacNode> fieldNodes = addFieldsToBuilder(builderType, namesOfParameters, typesOfParameters, ast);
 		java.util.List<JCMethodDecl> newMethods = new ArrayList<JCMethodDecl>();
 		for (JavacNode fieldNode : fieldNodes) {
-			JCMethodDecl newMethod = makeSetterMethodForBuilder(builderType, fieldNode, ast, builderInstance.fluent(), builderInstance.chain());
+			JCMethodDecl newMethod = makeSetterMethodForBuilder(builderType, fieldNode, annotationNode, builderInstance.fluent(), builderInstance.chain());
 			if (newMethod != null) newMethods.add(newMethod);
 		}
 		
 		if (constructorExists(builderType) == MemberExistsResult.NOT_EXISTS) {
-			JCMethodDecl cd = HandleConstructor.createConstructor(AccessLevel.PACKAGE, List.<JCAnnotation>nil(), builderType, List.<JavacNode>nil(), null, ast);
+			JCMethodDecl cd = HandleConstructor.createConstructor(AccessLevel.PACKAGE, List.<JCAnnotation>nil(), builderType, List.<JavacNode>nil(), null, annotationNode);
 			if (cd != null) injectMethod(builderType, cd);
 		}
 		
@@ -300,7 +300,7 @@ public class HandleBuilder extends JavacAnnotationHandler<Builder> {
 	}
 	
 	
-	public JCMethodDecl makeSetterMethodForBuilder(JavacNode builderType, JavacNode fieldNode, JCTree source, boolean fluent, boolean chain) {
+	public JCMethodDecl makeSetterMethodForBuilder(JavacNode builderType, JavacNode fieldNode, JavacNode source, boolean fluent, boolean chain) {
 		Name fieldName = ((JCVariableDecl) fieldNode.get()).name;
 		
 		for (JavacNode child : builderType.down()) {

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

@@ -214,7 +214,7 @@ public class HandleConstructor {
 			}
 		}
 		
-		JCMethodDecl constr = createConstructor(staticConstrRequired ? AccessLevel.PRIVATE : level, onConstructor, typeNode, fields, suppressConstructorProperties, source.get());
+		JCMethodDecl constr = createConstructor(staticConstrRequired ? AccessLevel.PRIVATE : level, onConstructor, typeNode, fields, suppressConstructorProperties, source);
 		injectMethod(typeNode, constr);
 		if (staticConstrRequired) {
 			JCMethodDecl staticConstr = createStaticConstructor(staticName, level, typeNode, fields, source.get());
@@ -236,7 +236,7 @@ public class HandleConstructor {
 		mods.annotations = mods.annotations.append(annotation);
 	}
 	
-	public static JCMethodDecl createConstructor(AccessLevel level, List<JCAnnotation> onConstructor, JavacNode typeNode, List<JavacNode> fields, Boolean suppressConstructorProperties, JCTree source) {
+	public static JCMethodDecl createConstructor(AccessLevel level, List<JCAnnotation> onConstructor, JavacNode typeNode, List<JavacNode> fields, Boolean suppressConstructorProperties, JavacNode source) {
 		JavacTreeMaker maker = typeNode.getTreeMaker();
 		
 		boolean isEnum = (((JCClassDecl) typeNode.get()).mods.flags & Flags.ENUM) != 0;
@@ -268,7 +268,7 @@ public class HandleConstructor {
 			assigns.append(maker.Exec(assign));
 			
 			if (!nonNulls.isEmpty()) {
-				JCStatement nullCheck = generateNullCheck(maker, fieldNode);
+				JCStatement nullCheck = generateNullCheck(maker, fieldNode, source);
 				if (nullCheck != null) nullChecks.append(nullCheck);
 			}
 		}
@@ -280,7 +280,8 @@ public class HandleConstructor {
 		if (onConstructor != null) mods.annotations = mods.annotations.appendList(copyAnnotations(onConstructor));
 		
 		return recursiveSetGeneratedBy(maker.MethodDef(mods, typeNode.toName("<init>"),
-				null, List.<JCTypeParameter>nil(), params.toList(), List.<JCExpression>nil(), maker.Block(0L, nullChecks.appendList(assigns).toList()), null), source, typeNode.getContext());
+				null, List.<JCTypeParameter>nil(), params.toList(), List.<JCExpression>nil(),
+				maker.Block(0L, nullChecks.appendList(assigns).toList()), null), source.get(), typeNode.getContext());
 	}
 	
 	public static boolean isLocalType(JavacNode type) {

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

@@ -84,8 +84,6 @@ public class HandleNonNull extends JavacAnnotationHandler<NonNull> {
 			return;
 		}
 		
-//		if (JavacHandlerUtil.isGenerated(declaration)) return;
-		
 		if (declaration.body == null) {
 			annotationNode.addWarning("@NonNull is meaningless on a parameter of an abstract method.");
 			return;
@@ -95,7 +93,7 @@ public class HandleNonNull extends JavacAnnotationHandler<NonNull> {
 		// and if they exist, create a new method in the class: 'private static <T> T lombok$nullCheck(T expr, String msg) {if (expr == null) throw NPE; return expr;}' and
 		// wrap all references to it in the super/this to a call to this method.
 		
-		JCStatement nullCheck = recursiveSetGeneratedBy(generateNullCheck(annotationNode.getTreeMaker(), annotationNode.up()), ast, annotationNode.getContext());
+		JCStatement nullCheck = recursiveSetGeneratedBy(generateNullCheck(annotationNode.getTreeMaker(), annotationNode.up(), annotationNode), ast, annotationNode.getContext());
 		
 		if (nullCheck == null) {
 			// @NonNull applied to a primitive. Kinda pointless. Let's generate a warning.

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

@@ -41,7 +41,6 @@ import lombok.javac.handlers.JavacHandlerUtil.FieldAccess;
 import org.mangosdk.spi.ProviderFor;
 
 import com.sun.tools.javac.code.Flags;
-import com.sun.tools.javac.tree.JCTree;
 import com.sun.tools.javac.tree.JCTree.JCAnnotation;
 import com.sun.tools.javac.tree.JCTree.JCAssign;
 import com.sun.tools.javac.tree.JCTree.JCBlock;
@@ -52,7 +51,6 @@ import com.sun.tools.javac.tree.JCTree.JCReturn;
 import com.sun.tools.javac.tree.JCTree.JCStatement;
 import com.sun.tools.javac.tree.JCTree.JCTypeParameter;
 import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
-import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
 import com.sun.tools.javac.util.List;
 import com.sun.tools.javac.util.ListBuffer;
 import com.sun.tools.javac.util.Name;
@@ -90,7 +88,7 @@ public class HandleSetter extends JavacAnnotationHandler<Setter> {
 			//Skip final fields.
 			if ((fieldDecl.mods.flags & Flags.FINAL) != 0) continue;
 			
-			generateSetterForField(field, errorNode.get(), level);
+			generateSetterForField(field, errorNode, level);
 		}
 	}
 	
@@ -109,13 +107,13 @@ public class HandleSetter extends JavacAnnotationHandler<Setter> {
 	 * @param fieldNode The node representing the field you want a setter for.
 	 * @param pos The node responsible for generating the setter (the {@code @Data} or {@code @Setter} annotation).
 	 */
-	public void generateSetterForField(JavacNode fieldNode, DiagnosticPosition pos, AccessLevel level) {
+	public void generateSetterForField(JavacNode fieldNode, JavacNode sourceNode, AccessLevel level) {
 		if (hasAnnotation(Setter.class, fieldNode)) {
 			//The annotation will make it happen, so we can skip it.
 			return;
 		}
 		
-		createSetterForField(level, fieldNode, fieldNode, false, List.<JCAnnotation>nil(), List.<JCAnnotation>nil());
+		createSetterForField(level, fieldNode, sourceNode, false, List.<JCAnnotation>nil(), List.<JCAnnotation>nil());
 	}
 	
 	@Override public void handle(AnnotationValues<Setter> annotation, JCAnnotation ast, JavacNode annotationNode) {
@@ -150,7 +148,7 @@ public class HandleSetter extends JavacAnnotationHandler<Setter> {
 		}
 	}
 	
-	public void createSetterForField(AccessLevel level, JavacNode fieldNode, JavacNode source, boolean whineIfExists, List<JCAnnotation> onMethod, List<JCAnnotation> onParam) {
+	public void createSetterForField(AccessLevel level, JavacNode fieldNode, JavacNode sourceNode, boolean whineIfExists, List<JCAnnotation> onMethod, List<JCAnnotation> onParam) {
 		if (fieldNode.getKind() != Kind.FIELD) {
 			fieldNode.addError("@Setter is only supported on a class or a field.");
 			return;
@@ -160,12 +158,12 @@ public class HandleSetter extends JavacAnnotationHandler<Setter> {
 		String methodName = toSetterName(fieldNode);
 		
 		if (methodName == null) {
-			source.addWarning("Not generating setter for this field: It does not fit your @Accessors prefix list.");
+			fieldNode.addWarning("Not generating setter for this field: It does not fit your @Accessors prefix list.");
 			return;
 		}
 		
 		if ((fieldDecl.mods.flags & Flags.FINAL) != 0) {
-			source.addWarning("Not generating setter for this field: Setters cannot be generated for final fields.");
+			fieldNode.addWarning("Not generating setter for this field: Setters cannot be generated for final fields.");
 			return;
 		}
 		
@@ -177,7 +175,7 @@ public class HandleSetter extends JavacAnnotationHandler<Setter> {
 				if (whineIfExists) {
 					String altNameExpl = "";
 					if (!altName.equals(methodName)) altNameExpl = String.format(" (%s)", altName);
-					source.addWarning(
+					fieldNode.addWarning(
 						String.format("Not generating %s(): A method with that name already exists%s", methodName, altNameExpl));
 				}
 				return;
@@ -189,17 +187,17 @@ public class HandleSetter extends JavacAnnotationHandler<Setter> {
 		
 		long access = toJavacModifier(level) | (fieldDecl.mods.flags & Flags.STATIC);
 		
-		JCMethodDecl createdSetter = createSetter(access, fieldNode, fieldNode.getTreeMaker(), source.get(), onMethod, onParam);
+		JCMethodDecl createdSetter = createSetter(access, fieldNode, fieldNode.getTreeMaker(), sourceNode, onMethod, onParam);
 		injectMethod(fieldNode.up(), createdSetter);
 	}
 	
-	public static JCMethodDecl createSetter(long access, JavacNode field, JavacTreeMaker treeMaker, JCTree source, List<JCAnnotation> onMethod, List<JCAnnotation> onParam) {
+	public static JCMethodDecl createSetter(long access, JavacNode field, JavacTreeMaker treeMaker, JavacNode source, List<JCAnnotation> onMethod, List<JCAnnotation> onParam) {
 		String setterName = toSetterName(field);
 		boolean returnThis = shouldReturnThis(field);
 		return createSetter(access, field, treeMaker, setterName, returnThis, source, onMethod, onParam);
 	}
 	
-	public static JCMethodDecl createSetter(long access, JavacNode field, JavacTreeMaker treeMaker, String setterName, boolean shouldReturnThis, JCTree source, List<JCAnnotation> onMethod, List<JCAnnotation> onParam) {
+	public static JCMethodDecl createSetter(long access, JavacNode field, JavacTreeMaker treeMaker, String setterName, boolean shouldReturnThis, JavacNode source, List<JCAnnotation> onMethod, List<JCAnnotation> onParam) {
 		if (setterName == null) return null;
 		
 		JCVariableDecl fieldDecl = (JCVariableDecl) field.get();
@@ -220,7 +218,7 @@ public class HandleSetter extends JavacAnnotationHandler<Setter> {
 		if (nonNulls.isEmpty()) {
 			statements.append(treeMaker.Exec(assign));
 		} else {
-			JCStatement nullCheck = generateNullCheck(treeMaker, field);
+			JCStatement nullCheck = generateNullCheck(treeMaker, field, source);
 			if (nullCheck != null) statements.append(nullCheck);
 			statements.append(treeMaker.Exec(assign));
 		}
@@ -253,7 +251,7 @@ public class HandleSetter extends JavacAnnotationHandler<Setter> {
 		}
 		
 		JCMethodDecl decl = recursiveSetGeneratedBy(treeMaker.MethodDef(treeMaker.Modifiers(access, annsOnMethod), methodName, methodType,
-				methodGenericParams, parameters, throwsClauses, methodBody, annotationMethodDefaultValue), source, field.getContext());
+				methodGenericParams, parameters, throwsClauses, methodBody, annotationMethodDefaultValue), source.get(), field.getContext());
 		copyJavadoc(field, decl, CopyJavadoc.SETTER);
 		return decl;
 	}

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

@@ -41,7 +41,6 @@ import lombok.javac.handlers.JavacHandlerUtil.FieldAccess;
 import org.mangosdk.spi.ProviderFor;
 
 import com.sun.tools.javac.code.Flags;
-import com.sun.tools.javac.tree.JCTree;
 import com.sun.tools.javac.tree.JCTree.JCAnnotation;
 import com.sun.tools.javac.tree.JCTree.JCBlock;
 import com.sun.tools.javac.tree.JCTree.JCClassDecl;
@@ -161,22 +160,22 @@ public class HandleWither extends JavacAnnotationHandler<Wither> {
 		String methodName = toWitherName(fieldNode);
 		
 		if (methodName == null) {
-			source.addWarning("Not generating wither for this field: It does not fit your @Accessors prefix list.");
+			fieldNode.addWarning("Not generating wither for this field: It does not fit your @Accessors prefix list.");
 			return;
 		}
 		
 		if ((fieldDecl.mods.flags & Flags.STATIC) != 0) {
-			source.addWarning("Not generating wither for this field: Withers cannot be generated for static fields.");
+			fieldNode.addWarning("Not generating wither for this field: Withers cannot be generated for static fields.");
 			return;
 		}
 		
 		if ((fieldDecl.mods.flags & Flags.FINAL) != 0 && fieldDecl.init != null) {
-			source.addWarning("Not generating wither for this field: Withers cannot be generated for final, initialized fields.");
+			fieldNode.addWarning("Not generating wither for this field: Withers cannot be generated for final, initialized fields.");
 			return;
 		}
 		
 		if (fieldDecl.name.toString().startsWith("$")) {
-			source.addWarning("Not generating wither for this field: Withers cannot be generated for fields starting with $.");
+			fieldNode.addWarning("Not generating wither for this field: Withers cannot be generated for fields starting with $.");
 			return;
 		}
 		
@@ -188,7 +187,7 @@ public class HandleWither extends JavacAnnotationHandler<Wither> {
 				if (whineIfExists) {
 					String altNameExpl = "";
 					if (!altName.equals(methodName)) altNameExpl = String.format(" (%s)", altName);
-					source.addWarning(
+					fieldNode.addWarning(
 						String.format("Not generating %s(): A method with that name already exists%s", methodName, altNameExpl));
 				}
 				return;
@@ -200,11 +199,11 @@ public class HandleWither extends JavacAnnotationHandler<Wither> {
 		
 		long access = toJavacModifier(level);
 		
-		JCMethodDecl createdWither = createWither(access, fieldNode, fieldNode.getTreeMaker(), source.get(), onMethod, onParam);
+		JCMethodDecl createdWither = createWither(access, fieldNode, fieldNode.getTreeMaker(), source, onMethod, onParam);
 		injectMethod(fieldNode.up(), createdWither);
 	}
 	
-	public JCMethodDecl createWither(long access, JavacNode field, JavacTreeMaker maker, JCTree source, List<JCAnnotation> onMethod, List<JCAnnotation> onParam) {
+	public JCMethodDecl createWither(long access, JavacNode field, JavacTreeMaker maker, JavacNode source, List<JCAnnotation> onMethod, List<JCAnnotation> onParam) {
 		String witherName = toWitherName(field);
 		if (witherName == null) return null;
 		
@@ -249,7 +248,7 @@ public class HandleWither extends JavacAnnotationHandler<Wither> {
 		if (nonNulls.isEmpty()) {
 			statements.append(returnStatement);
 		} else {
-			JCStatement nullCheck = generateNullCheck(maker, field);
+			JCStatement nullCheck = generateNullCheck(maker, field, source);
 			if (nullCheck != null) statements.append(nullCheck);
 			statements.append(returnStatement);
 		}
@@ -268,7 +267,7 @@ public class HandleWither extends JavacAnnotationHandler<Wither> {
 			annsOnMethod = annsOnMethod.prepend(maker.Annotation(genJavaLangTypeRef(field, "Deprecated"), List.<JCExpression>nil()));
 		}
 		JCMethodDecl decl = recursiveSetGeneratedBy(maker.MethodDef(maker.Modifiers(access, annsOnMethod), methodName, returnType,
-				methodGenericParams, parameters, throwsClauses, methodBody, annotationMethodDefaultValue), source, field.getContext());
+				methodGenericParams, parameters, throwsClauses, methodBody, annotationMethodDefaultValue), source.get(), field.getContext());
 		copyJavadoc(field, decl, CopyJavadoc.WITHER);
 		return decl;
 	}

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

@@ -898,6 +898,17 @@ public class JavacHandlerUtil {
 		return flags;
 	}
 	
+	public static JCExpression genTypeRef(JavacNode node, String complexName) {
+		String[] parts = complexName.split("\\.");
+		if (parts.length > 2 && parts[0].equals("java") && parts[1].equals("lang")) {
+			String[] subParts = new String[parts.length - 2];
+			System.arraycopy(parts, 2, subParts, 0, subParts.length);
+			return genJavaLangTypeRef(node, subParts);
+		}
+		
+		return chainDots(node, parts);
+	}
+	
 	public static JCExpression genJavaLangTypeRef(JavacNode node, String... simpleNames) {
 		if (LombokOptionsFactory.getDelombokOptions(node.getContext()).getFormatPreferences().javaLangAsFqn()) {
 			return chainDots(node, "java", "lang", simpleNames);
@@ -1029,15 +1040,27 @@ public class JavacHandlerUtil {
 	}
 	
 	/**
-	 * Generates a new statement that checks if the given variable is null, and if so, throws a {@code NullPointerException} with the
+	 * Generates a new statement that checks if the given variable is null, and if so, throws a specified exception with the
 	 * variable name as message.
+	 * 
+	 * @param exName The name of the exception to throw; normally {@code java.lang.NullPointerException}.
 	 */
-	public static JCStatement generateNullCheck(JavacTreeMaker maker, JavacNode variable) {
+	public static JCStatement generateNullCheck(JavacTreeMaker maker, JavacNode variable, JavacNode source) {
+		String exceptionType = source.getAst().readConfiguration(ConfigurationKeys.NON_NULL_EXCEPTION_TYPE);
+		if (exceptionType == null) {
+			exceptionType = HandlerUtil.DEFAULT_EXCEPTION_FOR_NON_NULL;
+		} else {
+			if (!HandlerUtil.isLegalBasicClassReference(exceptionType)) {
+				source.addWarning("Configuration key contains invalid java type reference '" + exceptionType + "'; use something like 'java.lang.NullPointerException' as value for this key.");
+				exceptionType = HandlerUtil.DEFAULT_EXCEPTION_FOR_NON_NULL;
+			}
+		}
+		
 		JCVariableDecl varDecl = (JCVariableDecl) variable.get();
 		if (isPrimitive(varDecl.vartype)) return null;
 		Name fieldName = varDecl.name;
-		JCExpression npe = genJavaLangTypeRef(variable, "NullPointerException");
-		JCExpression exception = maker.NewClass(null, List.<JCExpression>nil(), npe, List.<JCExpression>of(maker.Literal(fieldName.toString())), null);
+		JCExpression exType = genTypeRef(variable, exceptionType);
+		JCExpression exception = maker.NewClass(null, List.<JCExpression>nil(), exType, List.<JCExpression>of(maker.Literal(fieldName.toString())), null);
 		JCStatement throwStatement = maker.Throw(exception);
 		JCBlock throwBlock = maker.Block(0, List.of(throwStatement));
 		return maker.If(maker.Binary(CTC_EQUAL, maker.Ident(fieldName), maker.Literal(CTC_BOT, null)), throwBlock, null);

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

@@ -0,0 +1,17 @@
+public class NonNullWithAlternateException {
+	@lombok.NonNull
+	private String test;
+	public void testMethod(@lombok.NonNull String arg) {
+		if (arg == null) {
+			throw new java.lang.IllegalArgumentException("arg");
+		}
+		System.out.println(arg);
+	}
+	@java.lang.SuppressWarnings("all")
+	public void setTest(@lombok.NonNull final String test) {
+		if (test == null) {
+			throw new java.lang.IllegalArgumentException("test");
+		}
+		this.test = test;
+	}
+}

test/transform/resource/after-ecj/NonNullWithAlternateException.java

@@ -0,0 +1,20 @@
+public class NonNullWithAlternateException {
+  private @lombok.NonNull @lombok.Setter String test;
+  public NonNullWithAlternateException() {
+    super();
+  }
+  public void testMethod(@lombok.NonNull String arg) {
+    if ((arg == null))
+        {
+          throw new java.lang.IllegalArgumentException("arg");
+        }
+    System.out.println(arg);
+  }
+  public @java.lang.SuppressWarnings("all") void setTest(final @lombok.NonNull String test) {
+    if ((test == null))
+        {
+          throw new java.lang.IllegalArgumentException("test");
+        }
+    this.test = test;
+  }
+}

test/transform/resource/before/NonNullWithAlternateException.java

@@ -0,0 +1,9 @@
+//CONF: lombok.nonNull.exceptionType = java.lang.IllegalArgumentException
+
+public class NonNullWithAlternateException {
+	@lombok.NonNull @lombok.Setter private String test;
+
+	public void testMethod(@lombok.NonNull String arg) {
+		System.out.println(arg);
+	}
+}

test/transform/resource/before/NonNullWithMistypedException.java

@@ -0,0 +1,7 @@
+//CONF: lombok.nonNull.exceptionType = 12345
+//skip compare content: Just testing appropriate generation of error message.
+
+@lombok.Data
+public class NonNullWithMistypedException {
+	private @lombok.NonNull String test;
+}

test/transform/resource/messages-delombok/NonNullPlain.java.messages

@@ -1 +1 @@
-8 @NonNull is meaningless on a primitive.
+5 @NonNull is meaningless on a primitive.

test/transform/resource/messages-delombok/NonNullWithMistypedException.java.messages

@@ -0,0 +1 @@
+4 Configuration key contains invalid java type reference '12345'; use something like 'java.lang.NullPointerException' as value for this key.

test/transform/resource/messages-ecj/NonNullWithMistypedException.java.messages

@@ -0,0 +1 @@
+4 Configuration key contains invalid java type reference '12345'; use something like 'java.lang.NullPointerException' as value for this key.

website/features/NonNull.html

@@ -42,6 +42,8 @@
 		<div class="overview confKeys">
 			<h3>Supported configuration keys:</h3>
 			<dl>
+			<dt><code>lombok.nonNull.exceptionType</code> = [<code>fully qualified name of an exception</code>] (default: <code>java.lang.NullPointerException</code>).
+			<dd>When lombok generates a null-check <code>if</code> statement, an exception is thrown, with the parameter / field name as message. By default, this will be a <code>java.lang.NullPointerException</code>, but you can for example put <code>java.lang.IllegalArgumentException</code> in this configuration key to have lombok throw a different exception.</dd>
 			<dt><code>lombok.nonNull.flagUsage</code> = [<code>warning</code> | <code>error</code>] (default: not set)</dt>
 			<dd>Lombok will flag any usage of <code>@NonNull</code> as a warning or error if configured.</dd>
 			</dl>