Implementing custom methods of Spring Data repository and exposing them through REST

After two days, I have solved in this way.

Custom Repository Interface:

public interface PersonRepositoryCustom {
    Page<Person> customFind(String param1, String param2, Pageable pageable);
}

Custom Repository Implementation

public class PersonRepositoryImpl implements PersonRepositoryCustom{

    @Override
    public Page<Person> customFind(String param1, String param2, Pageable pageable) {
        // custom query by mongo template, entity manager...
    }
}

Spring Data Repository:

@RepositoryRestResource(collectionResourceRel = "person", path = "person")
public interface PersonRepository extends MongoRepository<Person, String>, PersonRepositoryCustom {
    Page<Person> findByName(@Param("name") String name, Pageable pageable);
}

Bean Resource representation

public class PersonResource extends org.springframework.hateoas.Resource<Person>{

    public PersonResource(Person content, Iterable<Link> links) {
        super(content, links);
    }
}

Resource Assembler

@Component
public class PersonResourceAssembler extends ResourceAssemblerSupport<Person, PersonResource> {

    @Autowired
    RepositoryEntityLinks repositoryEntityLinks;

    public PersonResourceAssembler() {
        super(PersonCustomSearchController.class, PersonResource.class);
    }

    @Override
    public PersonResource toResource(Person person) {
        Link personLink = repositoryEntityLinks.linkToSingleResource(Person.class, person.getId());
        Link selfLink = new Link(personLink.getHref(), Link.REL_SELF);
        return new PersonResource(person, Arrays.asList(selfLink, personLink));
    }

}

Custom Spring MVC Controller

@BasePathAwareController
@RequestMapping("person/search")
public class PersonCustomSearchController implements ResourceProcessor<RepositorySearchesResource> {

    @Autowired
    PersonRepository personRepository;

    @Autowired
    PersonResourceAssembler personResourceAssembler;

    @Autowired
    private PagedResourcesAssembler<Person> pagedResourcesAssembler;

    @RequestMapping(value="customFind", method=RequestMethod.GET)
    public ResponseEntity<PagedResources> customFind(@RequestParam String param1, @RequestParam String param2, @PageableDefault Pageable pageable) {
        Page personPage = personRepository.customFind(param1, param2, pageable);
        PagedResources adminPagedResources = pagedResourcesAssembler.toResource(personPage, personResourceAssembler);

        if (personPage.getContent()==null || personPage.getContent().isEmpty()){
            EmbeddedWrappers wrappers = new EmbeddedWrappers(false);
            EmbeddedWrapper wrapper = wrappers.emptyCollectionOf(Person.class);
            List<EmbeddedWrapper> embedded = Collections.singletonList(wrapper);
            adminPagedResources = new PagedResources(embedded, adminPagedResources.getMetadata(), adminPagedResources.getLinks());
        }

        return new ResponseEntity<PagedResources>(adminPagedResources, HttpStatus.OK);
    }

    @Override
    public RepositorySearchesResource process(RepositorySearchesResource repositorySearchesResource) {
        final String search = repositorySearchesResource.getId().getHref();
        final Link customLink = new Link(search + "/customFind{?param1,param2,page,size,sort}").withRel("customFind");
        repositorySearchesResource.add(customLink);
        return repositorySearchesResource;
    }

}