Java – spring HATEOAS, pathvariable and saxserialization

I'm actually developing a small application to train, and I have a problem using spring HATEOAS and pathvariable

In fact, when I use something similar:

@RequestMapping(value = "/directories/{idDirectory}",method = RequestMethod.GET)
    public DirectoryDTO findById(@PathVariable String idDirectory) {
        DirectoryEntity directoryEntity = directoryService.findById(idDirectory);
        DirectoryDTO directoryDto = new DirectoryDTO(directoryEntity);
        directoryDto.add(linkTo(methodOn(DirectoryController.class).findById(idDirectory)).withSelfRel());
        return directoryDto;
    }

I have a mistake like this:

This is my directoryentity:

@Document(collection = "directory")
public class DirectoryEntity {

    @Id
    private String id;
    private String name;
    private String path;
    private List<DirectoryEntity> childrenDirectories;
    private DirectoryEntity parentDirectory;
    private List<FileEntity> fileEntities;

/* Get/set omitted */
}

And dto:

public class DirectoryDTO extends Resource<DirectoryEntity> {


    public DirectoryDTO(DirectoryEntity content,Link... links) {
        super(content,links);
    }

    public DirectoryDTO(DirectoryEntity content,Iterable<Link> links) {
        super(content,links);
    }
}

What on earth did I do wrong?

Solution

You must add a comment for @ xmlrootelement (name = "directoryentity") in directorydto