Spring Hateoas，PathVariable和SaxSerialization

Question

I m actually developping a little application to train, and I m facing a problem using Spring Hateoas using PathVariable.

In fact, when I use something like :

   @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've got an error like the following one :

[com.sun.istack.internal.SAXException2]: unable to marshal type DirectoryDTO to element because it's missing an annotation

Here 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 the 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 am I doing wrong ?

Answer 1

您必须在DirectoryDTO中添加@XmlRootElement(name = "directoryEntity")的注释。