#2356 Implicitly ignore reverse inherited mappings that do not have read and write methods

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

@@ -938,8 +938,10 @@ public class BeanMappingMethod extends NormalTypeMappingMethod {
 
             if ( targetWriteAccessor == null ) {
                 if ( targetReadAccessor == null ) {
-                    if ( mapping.getInheritContext() != null && mapping.getInheritContext().isForwarded() &&
-                        mapping.getInheritContext().getTemplateMethod().isUpdateMethod() != method.isUpdateMethod() ) {
+                    MappingOptions.InheritContext inheritContext = mapping.getInheritContext();
+                    if ( inheritContext != null ) {
+                        if ( inheritContext.isForwarded() &&
+                            inheritContext.getTemplateMethod().isUpdateMethod() != method.isUpdateMethod() ) {
                             // When a configuration is inherited and the template method is not same type as the current
                             // method then we can safely ignore this mapping.
                             // This means that a property which is inherited might be present for a direct mapping
@@ -947,6 +949,14 @@ public class BeanMappingMethod extends NormalTypeMappingMethod {
                             // or vice versa
                             return false;
                         }
+                        else if ( inheritContext.isReversed() ) {
+                            // When a configuration is reverse inherited and there are no read or write accessor
+                            // then we should ignore this mapping.
+                            // This most likely means that we were mapping the source parameter to the target.
+                            // If the error is due to something else it will be reported on the original mapping
+                            return false;
+                        }
+                    }
                     Set<String> readAccessors = resultTypeToMap.getPropertyReadAccessors().keySet();
                     String mostSimilarProperty = Strings.getMostSimilarWord( targetPropertyName, readAccessors );
 

processor/src/test/java/org/mapstruct/ap/test/bugs/_2356/Issue2356Mapper.java

@@ -0,0 +1,49 @@
+/*
+ * 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._2356;
+
+import org.mapstruct.InheritInverseConfiguration;
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+import org.mapstruct.factory.Mappers;
+
+/**
+ * @author Filip Hrisafov
+ */
+@Mapper
+public interface Issue2356Mapper {
+
+    Issue2356Mapper INSTANCE = Mappers.getMapper( Issue2356Mapper.class );
+
+    class Car {
+        //CHECKSTYLE:OFF
+        public String brand;
+        public String model;
+        public String modelInternational;
+        //CHECKSTYLE:ON
+    }
+
+    class CarDTO {
+        //CHECKSTYLE:OFF
+        public String brand;
+        public String modelName;
+        //CHECKSTYLE:ON
+    }
+
+    // When using InheritInverseConfiguration the mapping from in to modelName should be ignored
+    // and shouldn't lead to a compile error.
+    @Mapping(target = "modelName", source = "in")
+    CarDTO map(Car in);
+
+    default String mapToModel(Car in) {
+        return in.modelInternational == null ? in.model : in.modelInternational;
+    }
+
+    @InheritInverseConfiguration
+    @Mapping(target = "model", source = "modelName")
+    @Mapping(target = "modelInternational", ignore = true)
+    Car map(CarDTO in);
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_2356/Issue2356Test.java

@@ -0,0 +1,45 @@
+/*
+ * 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._2356;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mapstruct.ap.testutil.IssueKey;
+import org.mapstruct.ap.testutil.WithClasses;
+import org.mapstruct.ap.testutil.runner.AnnotationProcessorTestRunner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Filip Hrisafov
+ */
+@IssueKey("2356")
+@RunWith(AnnotationProcessorTestRunner.class)
+@WithClasses({
+    Issue2356Mapper.class
+})
+public class Issue2356Test {
+
+    @Test
+    public void shouldCompile() {
+        Issue2356Mapper.Car car = new Issue2356Mapper.Car();
+        car.brand = "Tesla";
+        car.model = "X";
+        car.modelInternational = "3";
+        Issue2356Mapper.CarDTO dto = Issue2356Mapper.INSTANCE.map( car );
+
+        assertThat( dto ).isNotNull();
+        assertThat( dto.brand ).isEqualTo( "Tesla" );
+        assertThat( dto.modelName ).isEqualTo( "3" );
+
+        car = Issue2356Mapper.INSTANCE.map( dto );
+
+        assertThat( car ).isNotNull();
+        assertThat( car.brand ).isEqualTo( "Tesla" );
+        assertThat( car.model ).isEqualTo( "3" );
+        assertThat( car.modelInternational ).isNull();
+    }
+}