@MapperConfig(
        componentModel = "spring",
        unmappedTargetPolicy = ReportingPolicy.IGNORE,
        uses = CommonMapper.class
)
public interface CommonMapperConfig<P extends CommonPayload, E extends CommonEntity> extends CommonMapper<P, E> {

    @AfterMapping
    default void afterMapping(@MappingTarget E entity, P payload) {
        if (entity.getNumber() > 0) {
            entity.setPositive(true);
        }
    }
}

C:\dev\env\experiment\cloned\mapstruct-aftermapping\src\main\java\com\example\mapstruct\mapper\CommonMapperConfig.java:21: error: @AfterMapping can only be applied to an implemented method.
    default void afterMapping(@MappingTarget E entity, P payload) {
                 ^

@Generated(
    value = "org.mapstruct.ap.MappingProcessor",
    date = "2023-06-01T10:04:02-0500",
    comments = "version: 1.4.2.Final, compiler: IncrementalProcessingEnvironment from gradle-language-java-8.0.jar, environment: Java 17.0.2 (Oracle Corporation)"
)
@Component
public class SpecificMapperImpl implements SpecificMapper {

    @Override
    public SpecificPayload toPayload(SpecificEntity entity) {
        if ( entity == null ) {
            return null;
        }

        SpecificPayload specificPayload = new SpecificPayload();

        specificPayload.setNumber( entity.getNumber() );
        specificPayload.setName( entity.getName() );

        return specificPayload;
    }

    @Override
    public SpecificEntity toNewEntity(SpecificPayload payload) {
        if ( payload == null ) {
            return null;
        }

        SpecificEntity specificEntity = new SpecificEntity();

        specificEntity.setNumber( payload.getNumber() );
        specificEntity.setName( payload.getName() );

        afterMapping( specificEntity, payload );

        return specificEntity;
    }

    @Override
    public SpecificEntity toUpdatedEntity(SpecificPayload payload, SpecificEntity entity, EntityContext context) {
        if ( payload == null ) {
            return null;
        }

        entity.setNumber( payload.getNumber() );
        entity.setName( payload.getName() );

        afterMapping( entity, payload );

        return entity;
    }
}