#3849: Resolve duplicate invocation of overloaded lifecycle methods with inheritance

Add compiler option `mapstruct.disableLifecycleOverloadDeduplicateSelector` to disable the deduplication if needed.

Signed-off-by: TangYang <tangyang9464@163.com>

processor/src/main/java/org/mapstruct/ap/MappingProcessor.java

@@ -95,6 +95,7 @@ import static javax.lang.model.element.ElementKind.CLASS;
     MappingProcessor.VERBOSE,
     MappingProcessor.NULL_VALUE_ITERABLE_MAPPING_STRATEGY,
     MappingProcessor.NULL_VALUE_MAP_MAPPING_STRATEGY,
+    MappingProcessor.DISABLE_LIFECYCLE_OVERLOAD_DEDUPLICATE_SELECTOR,
 })
 public class MappingProcessor extends AbstractProcessor {
 
@@ -115,6 +116,8 @@ public class MappingProcessor extends AbstractProcessor {
     protected static final String VERBOSE = "mapstruct.verbose";
     protected static final String NULL_VALUE_ITERABLE_MAPPING_STRATEGY = "mapstruct.nullValueIterableMappingStrategy";
     protected static final String NULL_VALUE_MAP_MAPPING_STRATEGY = "mapstruct.nullValueMapMappingStrategy";
+    protected static final String DISABLE_LIFECYCLE_OVERLOAD_DEDUPLICATE_SELECTOR =
+        "mapstruct.disableLifecycleOverloadDeduplicateSelector";
 
     private final Set<String> additionalSupportedOptions;
     private final String additionalSupportedOptionsError;
@@ -174,6 +177,8 @@ public class MappingProcessor extends AbstractProcessor {
         String nullValueIterableMappingStrategy = processingEnv.getOptions()
             .get( NULL_VALUE_ITERABLE_MAPPING_STRATEGY );
         String nullValueMapMappingStrategy = processingEnv.getOptions().get( NULL_VALUE_MAP_MAPPING_STRATEGY );
+        String disableLifecycleOverloadDeduplicateSelector = processingEnv.getOptions()
+            .get( DISABLE_LIFECYCLE_OVERLOAD_DEDUPLICATE_SELECTOR );
 
         return new Options(
             Boolean.parseBoolean( processingEnv.getOptions().get( SUPPRESS_GENERATOR_TIMESTAMP ) ),
@@ -189,7 +194,8 @@ public class MappingProcessor extends AbstractProcessor {
                 NullValueMappingStrategyGem.valueOf( nullValueIterableMappingStrategy.toUpperCase( Locale.ROOT ) ) :
                 null,
             nullValueMapMappingStrategy != null ?
-                NullValueMappingStrategyGem.valueOf( nullValueMapMappingStrategy.toUpperCase( Locale.ROOT ) ) : null
+                NullValueMappingStrategyGem.valueOf( nullValueMapMappingStrategy.toUpperCase( Locale.ROOT ) ) : null,
+            Boolean.parseBoolean( disableLifecycleOverloadDeduplicateSelector )
         );
     }
 

processor/src/main/java/org/mapstruct/ap/internal/model/LifecycleMethodResolver.java

@@ -133,7 +133,7 @@ public final class LifecycleMethodResolver {
             MappingBuilderContext ctx, Set<String> existingVariableNames) {
 
         MethodSelectors selectors =
-            new MethodSelectors( ctx.getTypeUtils(), ctx.getElementUtils(), ctx.getMessager() );
+            new MethodSelectors( ctx.getTypeUtils(), ctx.getElementUtils(), ctx.getMessager(), ctx.getOptions() );
 
         List<SelectedMethod<SourceMethod>> matchingMethods = selectors.getMatchingMethods(
             callbackMethods,

processor/src/main/java/org/mapstruct/ap/internal/model/ObjectFactoryMethodResolver.java

@@ -5,12 +5,9 @@
  */
 package org.mapstruct.ap.internal.model;
 
-import static org.mapstruct.ap.internal.util.Collections.first;
-
 import java.util.ArrayList;
 import java.util.List;
 import java.util.stream.Collectors;
-
 import javax.lang.model.element.ElementKind;
 import javax.lang.model.element.ExecutableElement;
 
@@ -26,6 +23,8 @@ import org.mapstruct.ap.internal.model.source.selector.SelectedMethod;
 import org.mapstruct.ap.internal.model.source.selector.SelectionContext;
 import org.mapstruct.ap.internal.util.Message;
 
+import static org.mapstruct.ap.internal.util.Collections.first;
+
 /**
  *
  * @author Sjaak Derksen
@@ -126,7 +125,7 @@ public class ObjectFactoryMethodResolver {
         MappingBuilderContext ctx) {
 
         MethodSelectors selectors =
-            new MethodSelectors( ctx.getTypeUtils(), ctx.getElementUtils(), ctx.getMessager() );
+            new MethodSelectors( ctx.getTypeUtils(), ctx.getElementUtils(), ctx.getMessager(), null );
 
         return selectors.getMatchingMethods(
             getAllAvailableMethods( method, ctx.getSourceModel() ),

processor/src/main/java/org/mapstruct/ap/internal/model/PresenceCheckMethodResolver.java

@@ -119,7 +119,8 @@ public final class PresenceCheckMethodResolver {
         MethodSelectors selectors = new MethodSelectors(
             ctx.getTypeUtils(),
             ctx.getElementUtils(),
-            ctx.getMessager()
+            ctx.getMessager(),
+            null
         );
 
         return selectors.getMatchingMethods(

processor/src/main/java/org/mapstruct/ap/internal/model/source/selector/LifecycleOverloadDeduplicateSelector.java

@@ -0,0 +1,129 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.internal.model.source.selector;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import org.mapstruct.ap.internal.model.common.Parameter;
+import org.mapstruct.ap.internal.model.common.ParameterBinding;
+import org.mapstruct.ap.internal.model.source.Method;
+
+/**
+ * Selector for deduplicating overloaded lifecycle callback methods
+ * whose parameter signatures differ only by type hierarchy.
+ * <p>
+ * In the context of lifecycle callback method selection
+ * (such as @BeforeMapping or @AfterMapping), it is possible to have multiple overloaded methods
+ * whose parameter lists are structurally identical except for the specific types,
+ * where those types are related by inheritance (e.g., one parameter is a superclass or subclass of another).
+ * <p>
+ * This selector groups such methods by their effective parameter signature
+ * (ignoring differences only in type hierarchy), and, within each group,
+ * retains only the method whose parameter types have the closest inheritance distance
+ * to the actual invocation types.
+ * This ensures that, for each group of nearly identical overloads,
+ * only the most specific and appropriate method is selected.
+ * <p>
+ * <b>Example (see Issue3849Test):</b>
+ *
+ * <pre>{@code
+ * @AfterMapping
+ * default void afterMapping(Parent source, @MappingTarget ParentDto target) { ... }
+ * @AfterMapping
+ * default void afterMapping(Parent source, @MappingTarget ChildDto target) { ... }
+ * }</pre>
+ * When mapping a Child to a ChildDto,
+ * only the method with ChildDto is selected, even though both methods match by signature
+ * except for the target type's inheritance relationship.
+ */
+public class LifecycleOverloadDeduplicateSelector implements MethodSelector {
+    @Override
+    public <T extends Method> List<SelectedMethod<T>> getMatchingMethods(List<SelectedMethod<T>> methods,
+                                                                         SelectionContext context) {
+        if ( !context.getSelectionCriteria().isLifecycleCallbackRequired() || methods.size() <= 1 ) {
+            return methods;
+        }
+        Collection<List<SelectedMethod<T>>> methodSignatureGroups =
+            methods.stream()
+                .collect( Collectors.groupingBy(
+                    LifecycleOverloadDeduplicateSelector::buildSignatureKey,
+                    LinkedHashMap::new,
+                    Collectors.toList()
+                ) )
+                .values();
+        List<SelectedMethod<T>> deduplicatedMethods = new ArrayList<>( methods.size() );
+        for ( List<SelectedMethod<T>> signatureGroup : methodSignatureGroups ) {
+            if ( signatureGroup.size() == 1 ) {
+                deduplicatedMethods.add( signatureGroup.get( 0 ) );
+                continue;
+            }
+            SelectedMethod<T> bestInheritanceMethod = signatureGroup.get( 0 );
+            for ( int i = 1; i < signatureGroup.size(); i++ ) {
+                SelectedMethod<T> candidateMethod = signatureGroup.get( i );
+                if ( isInheritanceBetter( candidateMethod, bestInheritanceMethod ) ) {
+                    bestInheritanceMethod = candidateMethod;
+                }
+            }
+            deduplicatedMethods.add( bestInheritanceMethod );
+        }
+        return deduplicatedMethods;
+    }
+
+    /**
+     * Builds a grouping key for a method based on its defining type,
+     * method name, and a detailed breakdown of each parameter binding.
+     * <p>
+     * The key consists of:
+     * <ul>
+     *   <li>The type that defines the method</li>
+     *   <li>The method name</li>
+     *   <li>parameter bindings</li>
+     * </ul>
+     * This ensures that methods are grouped together only if all these aspects match,
+     * except for differences in type hierarchy, which are handled separately.
+     */
+    private static <T extends Method> List<Object> buildSignatureKey(SelectedMethod<T> method) {
+        List<Object> key = new ArrayList<>();
+        key.add( method.getMethod().getDefiningType() );
+        key.add( method.getMethod().getName() );
+        for ( ParameterBinding binding : method.getParameterBindings() ) {
+            key.add( binding.getType() );
+            key.add( binding.getVariableName() );
+        }
+        return key;
+    }
+
+    /**
+     * Compare the inheritance distance of parameters between two methods to determine if candidateMethod is better.
+     * Compares parameters in order, returns as soon as a better one is found.
+     */
+    private <T extends Method> boolean isInheritanceBetter(SelectedMethod<T> candidateMethod,
+                                                           SelectedMethod<T> currentBestMethod) {
+        List<ParameterBinding> candidateBindings = candidateMethod.getParameterBindings();
+        List<ParameterBinding> bestBindings = currentBestMethod.getParameterBindings();
+        List<Parameter> candidateParams = candidateMethod.getMethod().getParameters();
+        List<Parameter> bestParams = currentBestMethod.getMethod().getParameters();
+        int paramCount = candidateBindings.size();
+
+        for ( int i = 0; i < paramCount; i++ ) {
+            int candidateDistance = candidateBindings.get( i )
+                .getType()
+                .distanceTo( candidateParams.get( i ).getType() );
+            int bestDistance = bestBindings.get( i ).getType().distanceTo( bestParams.get( i ).getType() );
+            if ( candidateDistance < bestDistance ) {
+                return true;
+            }
+            else if ( candidateDistance > bestDistance ) {
+                return false;
+            }
+        }
+        return false;
+    }
+}

processor/src/main/java/org/mapstruct/ap/internal/model/source/selector/MethodSelectors.java

@@ -10,6 +10,7 @@ import java.util.Arrays;
 import java.util.List;
 
 import org.mapstruct.ap.internal.model.source.Method;
+import org.mapstruct.ap.internal.option.Options;
 import org.mapstruct.ap.internal.util.ElementUtils;
 import org.mapstruct.ap.internal.util.FormattingMessager;
 import org.mapstruct.ap.internal.util.TypeUtils;
@@ -24,20 +25,27 @@ public class MethodSelectors {
     private final List<MethodSelector> selectors;
 
     public MethodSelectors(TypeUtils typeUtils, ElementUtils elementUtils,
-                           FormattingMessager messager) {
-        selectors = Arrays.asList(
+                           FormattingMessager messager, Options options) {
+        List<MethodSelector> selectorList = new ArrayList<>( Arrays.asList(
             new MethodFamilySelector(),
             new TypeSelector( messager ),
             new QualifierSelector( typeUtils, elementUtils ),
             new TargetTypeSelector( typeUtils ),
             new JavaxXmlElementDeclSelector( typeUtils ),
             new JakartaXmlElementDeclSelector( typeUtils ),
-            new InheritanceSelector(),
+            new InheritanceSelector()
+        ) );
+        if ( options != null && !options.isDisableLifecycleOverloadDeduplicateSelector() ) {
+            selectorList.add( new LifecycleOverloadDeduplicateSelector() );
+        }
+
+        selectorList.addAll( Arrays.asList(
             new CreateOrUpdateSelector(),
             new SourceRhsSelector(),
             new FactoryParameterSelector(),
             new MostSpecificResultTypeSelector()
-        );
+        ) );
+        this.selectors = selectorList;
     }
 
     /**

processor/src/main/java/org/mapstruct/ap/internal/option/Options.java

@@ -26,6 +26,7 @@ public class Options {
     private final boolean verbose;
     private final NullValueMappingStrategyGem nullValueIterableMappingStrategy;
     private final NullValueMappingStrategyGem nullValueMapMappingStrategy;
+    private final boolean disableLifecycleOverloadDeduplicateSelector;
 
     //CHECKSTYLE:OFF
     public Options(boolean suppressGeneratorTimestamp, boolean suppressGeneratorVersionComment,
@@ -36,7 +37,8 @@ public class Options {
                    boolean disableBuilders,
                    boolean verbose,
                    NullValueMappingStrategyGem nullValueIterableMappingStrategy,
-                   NullValueMappingStrategyGem nullValueMapMappingStrategy
+                   NullValueMappingStrategyGem nullValueMapMappingStrategy,
+                   boolean disableLifecycleOverloadDeduplicateSelector
                    ) {
         //CHECKSTYLE:ON
         this.suppressGeneratorTimestamp = suppressGeneratorTimestamp;
@@ -50,6 +52,7 @@ public class Options {
         this.verbose = verbose;
         this.nullValueIterableMappingStrategy = nullValueIterableMappingStrategy;
         this.nullValueMapMappingStrategy = nullValueMapMappingStrategy;
+        this.disableLifecycleOverloadDeduplicateSelector = disableLifecycleOverloadDeduplicateSelector;
     }
 
     public boolean isSuppressGeneratorTimestamp() {
@@ -95,4 +98,8 @@ public class Options {
     public NullValueMappingStrategyGem getNullValueMapMappingStrategy() {
         return nullValueMapMappingStrategy;
     }
+
+    public boolean isDisableLifecycleOverloadDeduplicateSelector() {
+        return disableLifecycleOverloadDeduplicateSelector;
+    }
 }

processor/src/main/java/org/mapstruct/ap/internal/processor/creation/MappingResolverImpl.java

@@ -116,7 +116,7 @@ public class MappingResolverImpl implements MappingResolver {
 
         this.conversions = new Conversions( typeFactory );
         this.builtInMethods = new BuiltInMappingMethods( typeFactory );
-        this.methodSelectors = new MethodSelectors( typeUtils, elementUtils, messager );
+        this.methodSelectors = new MethodSelectors( typeUtils, elementUtils, messager, null );
 
         this.verboseLogging = verboseLogging;
     }

processor/src/test/java/org/mapstruct/ap/test/bugs/_3849/Child.java

@@ -0,0 +1,12 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._3849;
+
+public class Child extends Parent {
+    public Child() {
+        super();
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_3849/ChildDto.java

@@ -0,0 +1,16 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._3849;
+
+public class ChildDto extends ParentDto {
+    public ChildDto(String value) {
+        super( value );
+    }
+
+    public void setValue(String value) {
+        super.setValue( value );
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_3849/DeduplicateBySourceMapper.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._3849;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.mapstruct.AfterMapping;
+import org.mapstruct.BeforeMapping;
+import org.mapstruct.Context;
+import org.mapstruct.Mapper;
+import org.mapstruct.MappingTarget;
+import org.mapstruct.factory.Mappers;
+
+@Mapper
+public interface DeduplicateBySourceMapper {
+
+    DeduplicateBySourceMapper INSTANCE = Mappers.getMapper( DeduplicateBySourceMapper.class );
+    List<String> INVOKED_METHODS = new ArrayList<>();
+
+    ParentDto mapParent(Parent source, @Context MappingContext context);
+
+    ParentDto mapChild(Child source, @Context MappingContext context);
+
+    class MappingContext {
+        @BeforeMapping
+        void deduplicateBySourceForBefore(Parent source, @MappingTarget ParentDto target) {
+            INVOKED_METHODS.add( "beforeMappingParentSourceInOtherClass" );
+        }
+
+        @BeforeMapping
+        void deduplicateBySourceForBefore(Child sourceChild, @MappingTarget ParentDto target) {
+            INVOKED_METHODS.add( "beforeMappingChildSourceInOtherClass" );
+        }
+
+        @AfterMapping
+        void deduplicateBySource(Parent source, @MappingTarget ParentDto target) {
+            INVOKED_METHODS.add( "afterMappingParentSourceInOtherClass" );
+        }
+
+        @AfterMapping
+        void deduplicateBySource(Child sourceChild, @MappingTarget ParentDto target) {
+            INVOKED_METHODS.add( "afterMappingChildSourceInOtherClass" );
+        }
+    }
+
+    @BeforeMapping
+    default void deduplicateBySourceForBefore(Parent source, @MappingTarget ParentDto target) {
+        INVOKED_METHODS.add( "beforeMappingParentSource" );
+    }
+
+    @BeforeMapping
+    default void deduplicateBySourceForBefore(Child sourceChild, @MappingTarget ParentDto target) {
+        INVOKED_METHODS.add( "beforeMappingChildSource" );
+    }
+
+    @AfterMapping
+    default void deduplicateBySource(Parent source, @MappingTarget ParentDto target) {
+        INVOKED_METHODS.add( "afterMappingParentSource" );
+    }
+
+    @AfterMapping
+    default void deduplicateBySource(Child sourceChild, @MappingTarget ParentDto target) {
+        INVOKED_METHODS.add( "afterMappingChildSource" );
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_3849/DeduplicateByTargetMapper.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._3849;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.mapstruct.AfterMapping;
+import org.mapstruct.BeforeMapping;
+import org.mapstruct.Context;
+import org.mapstruct.Mapper;
+import org.mapstruct.MappingTarget;
+import org.mapstruct.factory.Mappers;
+
+@Mapper
+public interface DeduplicateByTargetMapper {
+
+    DeduplicateByTargetMapper INSTANCE = Mappers.getMapper( DeduplicateByTargetMapper.class );
+    List<String> INVOKED_METHODS = new ArrayList<>();
+
+    ParentDto mapParent(Parent source, @Context MappingContext context);
+
+    ChildDto mapChild(Parent source, @Context MappingContext context);
+
+    class MappingContext {
+        @BeforeMapping
+        void deduplicateByTargetForBefore(Parent source, @MappingTarget ParentDto target) {
+            INVOKED_METHODS.add( "beforeMappingParentTargetInOtherClass" );
+        }
+
+        @BeforeMapping
+        void deduplicateByTargetForBefore(Parent source, @MappingTarget ChildDto target) {
+            INVOKED_METHODS.add( "beforeMappingChildTargetInOtherClass" );
+        }
+
+        @AfterMapping
+        void deduplicateByTarget(Parent source, @MappingTarget ParentDto target) {
+            INVOKED_METHODS.add( "afterMappingParentTargetInOtherClass" );
+        }
+
+        @AfterMapping
+        void deduplicateByTarget(Parent source, @MappingTarget ChildDto target) {
+            INVOKED_METHODS.add( "afterMappingChildTargetInOtherClass" );
+        }
+    }
+
+    @BeforeMapping
+    default void deduplicateByTargetForBefore(Parent source, @MappingTarget ParentDto target) {
+        INVOKED_METHODS.add( "beforeMappingParentTarget" );
+    }
+
+    @BeforeMapping
+    default void deduplicateByTargetForBefore(Parent source, @MappingTarget ChildDto target) {
+        INVOKED_METHODS.add( "beforeMappingChildTarget" );
+    }
+
+    @AfterMapping
+    default void deduplicateByTarget(Parent source, @MappingTarget ParentDto target) {
+        INVOKED_METHODS.add( "afterMappingParentTarget" );
+    }
+
+    @AfterMapping
+    default void deduplicateByTarget(Parent source, @MappingTarget ChildDto target) {
+        INVOKED_METHODS.add( "afterMappingChildTarget" );
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_3849/DeduplicateForCompileArgsMapper.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._3849;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.mapstruct.AfterMapping;
+import org.mapstruct.BeforeMapping;
+import org.mapstruct.Context;
+import org.mapstruct.Mapper;
+import org.mapstruct.MappingTarget;
+import org.mapstruct.factory.Mappers;
+
+@Mapper
+public interface DeduplicateForCompileArgsMapper {
+
+    DeduplicateForCompileArgsMapper INSTANCE = Mappers.getMapper( DeduplicateForCompileArgsMapper.class );
+    List<String> INVOKED_METHODS = new ArrayList<>();
+
+    ParentDto mapParent(Parent source, @Context MappingContext context);
+
+    ChildDto mapChild(Parent source, @Context MappingContext context);
+
+    class MappingContext {
+        @BeforeMapping
+        void deduplicateByTargetForBefore(Parent source, @MappingTarget ParentDto target) {
+            INVOKED_METHODS.add( "beforeMappingParentTargetInOtherClass" );
+        }
+
+        @BeforeMapping
+        void deduplicateByTargetForBefore(Parent source, @MappingTarget ChildDto target) {
+            INVOKED_METHODS.add( "beforeMappingChildTargetInOtherClass" );
+        }
+
+        @AfterMapping
+        void deduplicateByTarget(Parent source, @MappingTarget ParentDto target) {
+            INVOKED_METHODS.add( "afterMappingParentTargetInOtherClass" );
+        }
+
+        @AfterMapping
+        void deduplicateByTarget(Parent source, @MappingTarget ChildDto target) {
+            INVOKED_METHODS.add( "afterMappingChildTargetInOtherClass" );
+        }
+    }
+
+    @BeforeMapping
+    default void deduplicateByTargetForBefore(Parent source, @MappingTarget ParentDto target) {
+        INVOKED_METHODS.add( "beforeMappingParentTarget" );
+    }
+
+    @BeforeMapping
+    default void deduplicateByTargetForBefore(Parent source, @MappingTarget ChildDto target) {
+        INVOKED_METHODS.add( "beforeMappingChildTarget" );
+    }
+
+    @AfterMapping
+    default void deduplicateByTarget(Parent source, @MappingTarget ParentDto target) {
+        INVOKED_METHODS.add( "afterMappingParentTarget" );
+    }
+
+    @AfterMapping
+    default void deduplicateByTarget(Parent source, @MappingTarget ChildDto target) {
+        INVOKED_METHODS.add( "afterMappingChildTarget" );
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_3849/DeduplicateGenericMapper.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._3849;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.mapstruct.AfterMapping;
+import org.mapstruct.BeforeMapping;
+import org.mapstruct.Mapper;
+import org.mapstruct.MappingTarget;
+import org.mapstruct.factory.Mappers;
+
+@Mapper
+public interface DeduplicateGenericMapper {
+
+    DeduplicateGenericMapper INSTANCE = Mappers.getMapper( DeduplicateGenericMapper.class );
+    List<String> INVOKED_METHODS = new ArrayList<>();
+
+    ParentDto mapParent(Parent source);
+
+    ChildDto mapChild(Parent source);
+
+    @BeforeMapping
+    default <T extends ParentDto> void deduplicateBefore(Parent source, @MappingTarget T target) {
+        INVOKED_METHODS.add( "beforeMappingParentGeneric" );
+    }
+
+    @BeforeMapping
+    default void deduplicateBefore(Parent source, @MappingTarget ChildDto target) {
+        INVOKED_METHODS.add( "beforeMappingChild" );
+    }
+
+    @AfterMapping
+    default <T> void deduplicate(Parent source, @MappingTarget T target) {
+        INVOKED_METHODS.add( "afterMappingGeneric" );
+    }
+
+    @AfterMapping
+    default void deduplicate(Parent source, @MappingTarget ParentDto target) {
+        INVOKED_METHODS.add( "afterMappingParent" );
+    }
+
+    @AfterMapping
+    default void deduplicate(Parent source, @MappingTarget ChildDto target) {
+        INVOKED_METHODS.add( "afterMappingChild" );
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_3849/Issue3849Test.java

@@ -0,0 +1,150 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+
+package org.mapstruct.ap.test.bugs._3849;
+
+import org.mapstruct.ap.testutil.IssueKey;
+import org.mapstruct.ap.testutil.ProcessorTest;
+import org.mapstruct.ap.testutil.WithClasses;
+import org.mapstruct.ap.testutil.compilation.annotation.ProcessorOption;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@IssueKey("3849")
+@WithClasses({
+    Parent.class,
+    ParentDto.class,
+    Child.class,
+    ChildDto.class
+})
+public class Issue3849Test {
+
+    @ProcessorOption(name = "mapstruct.disableLifecycleOverloadDeduplicateSelector", value = "true")
+    @ProcessorTest()
+    @WithClasses(DeduplicateForCompileArgsMapper.class)
+    void lifecycleMappingOverloadSelectorDisableCompileArgs() {
+        Child child = new Child();
+        Parent parent = new Parent();
+
+        DeduplicateForCompileArgsMapper.MappingContext mappingContext =
+            new DeduplicateForCompileArgsMapper.MappingContext();
+        ParentDto parentDto = DeduplicateForCompileArgsMapper.INSTANCE.mapParent( parent, mappingContext );
+        assertThat( DeduplicateForCompileArgsMapper.INVOKED_METHODS )
+            .containsExactly(
+                "beforeMappingParentTargetInOtherClass",
+                "beforeMappingParentTarget",
+                "afterMappingParentTargetInOtherClass",
+                "afterMappingParentTarget"
+            );
+
+        DeduplicateForCompileArgsMapper.INVOKED_METHODS.clear();
+
+        ParentDto childDto = DeduplicateForCompileArgsMapper.INSTANCE.mapChild( child, mappingContext );
+
+        assertThat( DeduplicateForCompileArgsMapper.INVOKED_METHODS )
+            .containsExactly(
+                "beforeMappingChildTargetInOtherClass",
+                "beforeMappingChildTargetInOtherClass",
+                "beforeMappingChildTarget",
+                "beforeMappingChildTarget",
+                "afterMappingChildTargetInOtherClass",
+                "afterMappingChildTargetInOtherClass",
+                "afterMappingChildTarget",
+                "afterMappingChildTarget"
+            );
+
+        DeduplicateForCompileArgsMapper.INVOKED_METHODS.clear();
+    }
+
+    @ProcessorTest()
+    @WithClasses( DeduplicateByTargetMapper.class )
+    void lifecycleMappingOverloadByTarget() {
+        Child child = new Child();
+        Parent parent = new Parent();
+
+        DeduplicateByTargetMapper.MappingContext mappingContext = new DeduplicateByTargetMapper.MappingContext();
+        ParentDto parentDto = DeduplicateByTargetMapper.INSTANCE.mapParent( parent, mappingContext );
+        assertThat( DeduplicateByTargetMapper.INVOKED_METHODS )
+            .containsExactly(
+                "beforeMappingParentTargetInOtherClass",
+                "beforeMappingParentTarget",
+                "afterMappingParentTargetInOtherClass",
+                "afterMappingParentTarget"
+            );
+
+        DeduplicateByTargetMapper.INVOKED_METHODS.clear();
+
+        ParentDto childDto = DeduplicateByTargetMapper.INSTANCE.mapChild( child, mappingContext );
+
+        assertThat( DeduplicateByTargetMapper.INVOKED_METHODS )
+            .containsExactly(
+                "beforeMappingChildTargetInOtherClass",
+                "beforeMappingChildTarget",
+                "afterMappingChildTargetInOtherClass",
+                "afterMappingChildTarget"
+            );
+
+        DeduplicateByTargetMapper.INVOKED_METHODS.clear();
+    }
+
+    @ProcessorTest
+    @WithClasses( DeduplicateBySourceMapper.class )
+    void lifecycleMappingOverloadBySource() {
+        Child child = new Child();
+        Parent parent = new Parent();
+
+        DeduplicateBySourceMapper.MappingContext mappingContext = new DeduplicateBySourceMapper.MappingContext();
+        ParentDto parentDto = DeduplicateBySourceMapper.INSTANCE.mapParent( parent, mappingContext );
+        assertThat( DeduplicateBySourceMapper.INVOKED_METHODS )
+            .containsExactly(
+                "beforeMappingParentSourceInOtherClass",
+                "beforeMappingParentSource",
+                "afterMappingParentSourceInOtherClass",
+                "afterMappingParentSource"
+            );
+
+        DeduplicateBySourceMapper.INVOKED_METHODS.clear();
+
+        ParentDto childDto = DeduplicateBySourceMapper.INSTANCE.mapChild( child, mappingContext );
+
+        assertThat( DeduplicateBySourceMapper.INVOKED_METHODS )
+            .containsExactly(
+                "beforeMappingChildSourceInOtherClass",
+                "beforeMappingChildSource",
+                "afterMappingChildSourceInOtherClass",
+                "afterMappingChildSource"
+            );
+
+        DeduplicateBySourceMapper.INVOKED_METHODS.clear();
+    }
+
+    @ProcessorTest
+    @WithClasses(DeduplicateGenericMapper.class)
+    void lifecycleMappingOverloadForGeneric() {
+        Child child = new Child();
+        Parent parent = new Parent();
+
+        ParentDto parentDto = DeduplicateGenericMapper.INSTANCE.mapParent( parent );
+        assertThat( DeduplicateGenericMapper.INVOKED_METHODS )
+            .containsExactly(
+                "beforeMappingParentGeneric",
+                "afterMappingParent"
+            );
+
+        DeduplicateGenericMapper.INVOKED_METHODS.clear();
+
+        ParentDto childDto = DeduplicateGenericMapper.INSTANCE.mapChild( child );
+
+        assertThat( DeduplicateGenericMapper.INVOKED_METHODS )
+            .containsExactly(
+                "beforeMappingChild",
+                "afterMappingChild"
+            );
+
+        DeduplicateGenericMapper.INVOKED_METHODS.clear();
+    }
+}
+

processor/src/test/java/org/mapstruct/ap/test/bugs/_3849/Parent.java

@@ -0,0 +1,21 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._3849;
+
+public class Parent {
+    private String value;
+
+    public Parent() {
+    }
+
+    public String getValue() {
+        return value;
+    }
+
+    public void setValue(String value) {
+        this.value = value;
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_3849/ParentDto.java

@@ -0,0 +1,22 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._3849;
+
+public class ParentDto {
+    private String value;
+
+    public ParentDto(String value) {
+        this.value = value;
+    }
+
+    public String getValue() {
+        return value;
+    }
+
+    public void setValue(String value) {
+        this.value = value;
+    }
+}