#2253 remove unmapped source properties when source parameter is directly mapped

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

@@ -1315,6 +1315,16 @@ public class BeanMappingMethod extends NormalTypeMappingMethod {
                         sourceParameters.remove();
                         unprocessedDefinedTargets.remove( targetProperty.getKey() );
                         unprocessedSourceProperties.remove( targetProperty.getKey() );
+
+                        // The source parameter was directly mapped so ignore all of its source properties completely
+                        if ( !sourceParameter.getType().isPrimitive() && !sourceParameter.getType().isArrayType() ) {
+                            // We explicitly ignore source properties from primitives or array types
+                            Map<String, Accessor> readAccessors = sourceParameter.getType().getPropertyReadAccessors();
+                            for ( String sourceProperty : readAccessors.keySet() ) {
+                                unprocessedSourceProperties.remove( sourceProperty );
+                            }
+                        }
+
                         unprocessedConstructorProperties.remove( targetProperty.getKey() );
                     }
                 }

processor/src/test/java/org/mapstruct/ap/test/bugs/_2253/Issue2253Test.java

@@ -0,0 +1,34 @@
+/*
+ * 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._2253;
+
+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("2253")
+@RunWith( AnnotationProcessorTestRunner.class )
+@WithClasses( {
+    TestMapper.class,
+} )
+public class Issue2253Test {
+
+    @Test
+    public void shouldNotTreatMatchedSourceParameterAsBean() {
+
+        TestMapper.Person person = TestMapper.INSTANCE.map( new TestMapper.PersonDto( 20 ), "Tester" );
+
+        assertThat( person.getAge() ).isEqualTo( 20 );
+        assertThat( person.getName() ).isEqualTo( "Tester" );
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_2253/TestMapper.java

@@ -0,0 +1,48 @@
+/*
+ * 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._2253;
+
+import org.mapstruct.Mapper;
+import org.mapstruct.ReportingPolicy;
+import org.mapstruct.factory.Mappers;
+
+@Mapper(unmappedSourcePolicy = ReportingPolicy.ERROR)
+public interface TestMapper {
+
+    TestMapper INSTANCE = Mappers.getMapper( TestMapper.class );
+
+    Person map(PersonDto personDto, String name);
+
+    class Person {
+        private final int age;
+        private final String name;
+
+        public Person(int age, String name) {
+            this.age = age;
+            this.name = name;
+        }
+
+        public int getAge() {
+            return age;
+        }
+
+        public String getName() {
+            return name;
+        }
+    }
+
+    class PersonDto {
+        private final int age;
+
+        public PersonDto(int age) {
+            this.age = age;
+        }
+
+        public int getAge() {
+            return age;
+        }
+    }
+}