I have a mapper

@Mapper(uses = {PostConverter.class, TagConverter.class})
public interface TagMapper {

    void update(TagRequestDTO source, @MappingTarget Tag destination);

    Tag dtoToTag(TagRequestDTO dto);

    TagResponseDTO tagToDTO(Tag tag);
    
    Tag longToTag(Long id);
}

Is there a way to set the behavior of mapstruct so that it uses a method from TagConverter, rather than generating its own? (using default methods and abstract classes is not possible)

Converter

public interface TagConverter {
    
    Tag longToTag(Long id);

    Set<Long> fromTagsToLong(Set<Tag> tags);

    Set<Tag> fromLongsToTags(Set<Long> ids);
}

Implementation

@Component
@RequiredArgsConstructor
public class TagConverterImpl implements TagConverter {

    private final TagRepository repository;

    @Override
    public Tag longToTag(Long id) {
        return repository.findById(id).orElseThrow(() -> new EntityNotFoundException("Tag", id));
    }
}

I read the MapStruct docs, but didn’t find a solution.