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diff --git a/src/core/lombok/javac/handlers/HandleWithBy.java b/src/core/lombok/javac/handlers/HandleWithBy.java
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+++ b/src/core/lombok/javac/handlers/HandleWithBy.java
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+/*
+ * Copyright (C) 2020 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
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package lombok.javac.handlers;
+
+import static lombok.core.handlers.HandlerUtil.*;
+import static lombok.javac.handlers.JavacHandlerUtil.*;
+
+import java.util.Collection;
+
+import javax.lang.model.type.TypeKind;
+
+import lombok.AccessLevel;
+import lombok.ConfigurationKeys;
+import lombok.core.AST.Kind;
+import lombok.core.AnnotationValues;
+import lombok.core.LombokImmutableList;
+import lombok.core.configuration.CheckerFrameworkVersion;
+import lombok.experimental.WithBy;
+import lombok.javac.Javac;
+import lombok.javac.JavacAnnotationHandler;
+import lombok.javac.JavacNode;
+import lombok.javac.JavacTreeMaker;
+import lombok.javac.JavacTreeMaker.TypeTag;
+import lombok.javac.handlers.JavacHandlerUtil.CopyJavadoc;
+
+import org.mangosdk.spi.ProviderFor;
+
+import com.sun.tools.javac.code.BoundKind;
+import com.sun.tools.javac.code.Flags;
+import com.sun.tools.javac.code.Type;
+import com.sun.tools.javac.code.Symbol.ClassSymbol;
+import com.sun.tools.javac.tree.JCTree.JCAnnotation;
+import com.sun.tools.javac.tree.JCTree.JCBlock;
+import com.sun.tools.javac.tree.JCTree.JCClassDecl;
+import com.sun.tools.javac.tree.JCTree.JCExpression;
+import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
+import com.sun.tools.javac.tree.JCTree.JCNewClass;
+import com.sun.tools.javac.tree.JCTree.JCPrimitiveTypeTree;
+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;
+
+/**
+ * Handles the {@code lombok.With} annotation for javac.
+ */
+@ProviderFor(JavacAnnotationHandler.class)
+public class HandleWithBy extends JavacAnnotationHandler<WithBy> {
+	public void generateWithByForType(JavacNode typeNode, JavacNode errorNode, AccessLevel level, boolean checkForTypeLevelWithBy) {
+		if (checkForTypeLevelWithBy) {
+			if (hasAnnotation(WithBy.class, typeNode)) {
+				//The annotation will make it happen, so we can skip it.
+				return;
+			}
+		}
+		
+		JCClassDecl typeDecl = null;
+		if (typeNode.get() instanceof JCClassDecl) typeDecl = (JCClassDecl) typeNode.get();
+		long modifiers = typeDecl == null ? 0 : typeDecl.mods.flags;
+		boolean notAClass = (modifiers & (Flags.INTERFACE | Flags.ANNOTATION | Flags.ENUM)) != 0;
+		
+		if (typeDecl == null || notAClass) {
+			errorNode.addError("@WithBy is only supported on a class or a field.");
+			return;
+		}
+		
+		for (JavacNode field : typeNode.down()) {
+			if (field.getKind() != Kind.FIELD) continue;
+			JCVariableDecl fieldDecl = (JCVariableDecl) field.get();
+			//Skip fields that start with $
+			if (fieldDecl.name.toString().startsWith("$")) continue;
+			//Skip static fields.
+			if ((fieldDecl.mods.flags & Flags.STATIC) != 0) continue;
+			//Skip final initialized fields.
+			if ((fieldDecl.mods.flags & Flags.FINAL) != 0 && fieldDecl.init != null) continue;
+			
+			generateWithByForField(field, errorNode.get(), level);
+		}
+	}
+	
+	/**
+	 * Generates a withBy on the stated field.
+	 * 
+	 * The difference between this call and the handle method is as follows:
+	 * 
+	 * If there is a {@code lombok.experimental.WithBy} annotation on the field, it is used and the
+	 * same rules apply (e.g. warning if the method already exists, stated access level applies).
+	 * If not, the with 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.
+	 * 
+	 * @param fieldNode The node representing the field you want a with for.
+	 * @param pos The node responsible for generating the {@code @WithBy} annotation.
+	 */
+	public void generateWithByForField(JavacNode fieldNode, DiagnosticPosition pos, AccessLevel level) {
+		if (hasAnnotation(WithBy.class, fieldNode)) {
+			//The annotation will make it happen, so we can skip it.
+			return;
+		}
+		
+		createWithByForField(level, fieldNode, fieldNode, false, List.<JCAnnotation>nil());
+	}
+	
+	@Override public void handle(AnnotationValues<WithBy> annotation, JCAnnotation ast, JavacNode annotationNode) {
+		handleExperimentalFlagUsage(annotationNode, ConfigurationKeys.WITHBY_FLAG_USAGE, "@WithBy");
+		
+		Collection<JavacNode> fields = annotationNode.upFromAnnotationToFields();
+		deleteAnnotationIfNeccessary(annotationNode, WithBy.class);
+		deleteImportFromCompilationUnit(annotationNode, "lombok.AccessLevel");
+		JavacNode node = annotationNode.up();
+		AccessLevel level = annotation.getInstance().value();
+		
+		if (level == AccessLevel.NONE || node == null) return;
+		
+		List<JCAnnotation> onMethod = unboxAndRemoveAnnotationParameter(ast, "onMethod", "@WithBy(onMethod", annotationNode);
+		
+		switch (node.getKind()) {
+		case FIELD:
+			createWithByForFields(level, fields, annotationNode, true, onMethod);
+			break;
+		case TYPE:
+			if (!onMethod.isEmpty()) annotationNode.addError("'onMethod' is not supported for @WithBy on a type.");
+			generateWithByForType(node, annotationNode, level, false);
+			break;
+		}
+	}
+	
+	public void createWithByForFields(AccessLevel level, Collection<JavacNode> fieldNodes, JavacNode errorNode, boolean whineIfExists, List<JCAnnotation> onMethod) {
+		for (JavacNode fieldNode : fieldNodes) {
+			createWithByForField(level, fieldNode, errorNode, whineIfExists, onMethod);
+		}
+	}
+	
+	public void createWithByForField(AccessLevel level, JavacNode fieldNode, JavacNode source, boolean strictMode, List<JCAnnotation> onMethod) {
+		JavacNode typeNode = fieldNode.up();
+		boolean makeAbstract = typeNode != null && typeNode.getKind() == Kind.TYPE && (((JCClassDecl) typeNode.get()).mods.flags & Flags.ABSTRACT) != 0;
+		
+		if (fieldNode.getKind() != Kind.FIELD) {
+			fieldNode.addError("@WithBy is only supported on a class or a field.");
+			return;
+		}
+		
+		JCVariableDecl fieldDecl = (JCVariableDecl) fieldNode.get();
+		String methodName = toWithByName(fieldNode);
+		
+		if (methodName == null) {
+			fieldNode.addWarning("Not generating a withXBy method for this field: It does not fit your @Accessors prefix list.");
+			return;
+		}
+		
+		if ((fieldDecl.mods.flags & Flags.STATIC) != 0) {
+			if (strictMode) fieldNode.addWarning("Not generating " + methodName + " for this field: WithBy methods cannot be generated for static fields.");
+			return;
+		}
+		
+		if ((fieldDecl.mods.flags & Flags.FINAL) != 0 && fieldDecl.init != null) {
+			if (strictMode) fieldNode.addWarning("Not generating " + methodName + " for this field: WithBy methods cannot be generated for final, initialized fields.");
+			return;
+		}
+		
+		if (fieldDecl.name.toString().startsWith("$")) {
+			if (strictMode) fieldNode.addWarning("Not generating " + methodName + " for this field: WithBy methods cannot be generated for fields starting with $.");
+			return;
+		}
+		
+		for (String altName : toAllWithByNames(fieldNode)) {
+			switch (methodExists(altName, fieldNode, false, 1)) {
+			case EXISTS_BY_LOMBOK:
+				return;
+			case EXISTS_BY_USER:
+				if (strictMode) {
+					String altNameExpl = "";
+					if (!altName.equals(methodName)) altNameExpl = String.format(" (%s)", altName);
+					fieldNode.addWarning(
+						String.format("Not generating %s(): A method with that name already exists%s", methodName, altNameExpl));
+				}
+				return;
+			default:
+			case NOT_EXISTS:
+				//continue scanning the other alt names.
+			}
+		}
+		
+		long access = toJavacModifier(level);
+		
+		JCMethodDecl createdWithBy = createWithBy(access, fieldNode, fieldNode.getTreeMaker(), source, onMethod, makeAbstract);
+		ClassSymbol sym = ((JCClassDecl) fieldNode.up().get()).sym;
+		Type returnType = sym == null ? null : sym.type;
+		
+		injectMethod(typeNode, createdWithBy, List.<Type>of(getMirrorForFieldType(fieldNode)), returnType);
+	}
+	
+	private static final LombokImmutableList<String> NAME_JUF_FUNCTION = LombokImmutableList.of("java", "util", "function", "Function");
+	private static final LombokImmutableList<String> NAME_JUF_OP = LombokImmutableList.of("java", "util", "function", "UnaryOperator");
+	private static final LombokImmutableList<String> NAME_JUF_DOUBLEOP = LombokImmutableList.of("java", "util", "function", "DoubleUnaryOperator");
+	private static final LombokImmutableList<String> NAME_JUF_INTOP = LombokImmutableList.of("java", "util", "function", "IntUnaryOperator");
+	private static final LombokImmutableList<String> NAME_JUF_LONGOP = LombokImmutableList.of("java", "util", "function", "LongUnaryOperator");
+	
+	public JCMethodDecl createWithBy(long access, JavacNode field, JavacTreeMaker maker, JavacNode source, List<JCAnnotation> onMethod, boolean makeAbstract) {
+		String withByName = toWithByName(field);
+		if (withByName == null) return null;
+		
+		JCVariableDecl fieldDecl = (JCVariableDecl) field.get();
+		
+		Name methodName = field.toName(withByName);
+		
+		JCExpression returnType = cloneSelfType(field);
+		
+		JCBlock methodBody = null;
+		long flags = JavacHandlerUtil.addFinalIfNeeded(Flags.PARAMETER, field.getContext());
+		
+		LombokImmutableList<String> functionalInterfaceName = null;
+		TypeTag requiredCast = null;
+		JCExpression parameterizer = null;
+		boolean superExtendsStyle = true;
+		String applyMethodName = "apply";
+		
+		if (fieldDecl.vartype instanceof JCPrimitiveTypeTree) {
+			TypeKind kind = ((JCPrimitiveTypeTree) fieldDecl.vartype).getPrimitiveTypeKind();
+			if (kind == TypeKind.CHAR) {
+				requiredCast = Javac.CTC_CHAR;
+				functionalInterfaceName = NAME_JUF_INTOP;
+			} else if (kind == TypeKind.SHORT) {
+				requiredCast = Javac.CTC_SHORT;
+				functionalInterfaceName = NAME_JUF_INTOP;
+			} else if (kind == TypeKind.BYTE) {
+				requiredCast = Javac.CTC_BYTE;
+				functionalInterfaceName = NAME_JUF_INTOP;
+			} else if (kind == TypeKind.INT) {
+				functionalInterfaceName = NAME_JUF_INTOP;
+			} else if (kind == TypeKind.LONG) {
+				functionalInterfaceName = NAME_JUF_LONGOP;
+			} else if (kind == TypeKind.FLOAT) {
+				functionalInterfaceName = NAME_JUF_DOUBLEOP;
+				requiredCast = Javac.CTC_FLOAT;
+			} else if (kind == TypeKind.DOUBLE) {
+				functionalInterfaceName = NAME_JUF_DOUBLEOP;
+			} else if (kind == TypeKind.BOOLEAN) {
+				functionalInterfaceName = NAME_JUF_OP;
+				parameterizer = JavacHandlerUtil.genJavaLangTypeRef(field, "Boolean");
+				superExtendsStyle = false;
+			}
+		}
+		if (functionalInterfaceName == null) {
+			functionalInterfaceName = NAME_JUF_FUNCTION;
+			parameterizer = cloneType(maker, fieldDecl.vartype, source.get(), field.getContext());
+		}
+		if (functionalInterfaceName == NAME_JUF_INTOP) applyMethodName = "applyAsInt";
+		if (functionalInterfaceName == NAME_JUF_LONGOP) applyMethodName = "applyAsLong";
+		if (functionalInterfaceName == NAME_JUF_DOUBLEOP) applyMethodName = "applyAsDouble";
+		
+		JCExpression varType = chainDots(field, functionalInterfaceName);
+		if (parameterizer != null && superExtendsStyle) {
+			JCExpression parameterizer1 = parameterizer;
+			JCExpression parameterizer2 = cloneType(maker, parameterizer, source.get(), field.getContext());
+			// TODO: Apply copyable annotations to 'parameterizer' and 'parameterizer2'.
+			JCExpression arg1 = maker.Wildcard(maker.TypeBoundKind(BoundKind.SUPER), parameterizer1);
+			JCExpression arg2 = maker.Wildcard(maker.TypeBoundKind(BoundKind.EXTENDS), parameterizer2);
+			varType = maker.TypeApply(varType, List.of(arg1, arg2));
+		}
+		if (parameterizer != null && !superExtendsStyle) {
+			varType = maker.TypeApply(varType, List.of(parameterizer));
+		}
+		Name paramName = field.toName("transformer");
+		
+		JCVariableDecl param = maker.VarDef(maker.Modifiers(flags), paramName, varType, null);
+		
+		if (!makeAbstract) {
+			ListBuffer<JCStatement> statements = new ListBuffer<JCStatement>();
+			
+			JCExpression selfType = cloneSelfType(field);
+			if (selfType == null) return null;
+			
+			ListBuffer<JCExpression> args = new ListBuffer<JCExpression>();
+			for (JavacNode child : field.up().down()) {
+				if (child.getKind() != Kind.FIELD) continue;
+				JCVariableDecl childDecl = (JCVariableDecl) child.get();
+				// Skip fields that start with $
+				if (childDecl.name.toString().startsWith("$")) continue;
+				long fieldFlags = childDecl.mods.flags;
+				// Skip static fields.
+				if ((fieldFlags & Flags.STATIC) != 0) continue;
+				// Skip initialized final fields.
+				if (((fieldFlags & Flags.FINAL) != 0) && childDecl.init != null) continue;
+				if (child.get() == field.get()) {
+					JCExpression invoke = maker.Apply(List.<JCExpression>nil(), maker.Select(maker.Ident(paramName), field.toName(applyMethodName)), List.<JCExpression>of(createFieldAccessor(maker, child, FieldAccess.ALWAYS_FIELD)));
+					if (requiredCast != null) invoke = maker.TypeCast(maker.TypeIdent(requiredCast), invoke);
+					args.append(invoke);
+				} else {
+					args.append(createFieldAccessor(maker, child, FieldAccess.ALWAYS_FIELD));
+				}
+			}
+			
+			JCNewClass newClass = maker.NewClass(null, List.<JCExpression>nil(), selfType, args.toList(), null);
+			JCReturn returnStatement = maker.Return(newClass);
+			
+			statements.append(returnStatement);
+			
+			methodBody = maker.Block(0, statements.toList());
+		}
+		List<JCTypeParameter> methodGenericParams = List.nil();
+		List<JCVariableDecl> parameters = List.of(param);
+		List<JCExpression> throwsClauses = List.nil();
+		JCExpression annotationMethodDefaultValue = null;
+		
+		List<JCAnnotation> annsOnMethod = copyAnnotations(onMethod);
+		CheckerFrameworkVersion checkerFramework = getCheckerFrameworkVersion(source);
+		if (checkerFramework.generateSideEffectFree()) annsOnMethod = annsOnMethod.prepend(maker.Annotation(genTypeRef(source, CheckerFrameworkVersion.NAME__SIDE_EFFECT_FREE), List.<JCExpression>nil()));
+		
+		if (isFieldDeprecated(field)) annsOnMethod = annsOnMethod.prepend(maker.Annotation(genJavaLangTypeRef(field, "Deprecated"), List.<JCExpression>nil()));
+		
+		if (makeAbstract) access = access | Flags.ABSTRACT;
+		createRelevantNonNullAnnotation(source, param);
+		JCMethodDecl decl = recursiveSetGeneratedBy(maker.MethodDef(maker.Modifiers(access, annsOnMethod), methodName, returnType,
+			methodGenericParams, parameters, throwsClauses, methodBody, annotationMethodDefaultValue), source.get(), field.getContext());
+		copyJavadoc(field, decl, CopyJavadoc.WITH_BY);
+		createRelevantNonNullAnnotation(source, decl);
+		return decl;
+	}
+}