findAll() function at backend causes net::INCOMPLET_CHUNKED_ENCODING error at frontend

Question

I'm developing an angular project that communicates with a spring-boot backend. here are the codes at the backend

public class Article extends Audit<String> implements Serializable{
@Id
@Column(insertable = true, updatable = true)
private String codArt;
private String libArt;
private String libCou;
private boolean achetable;
private boolean numSerie;
private boolean stockable;
private boolean perissable;
private boolean consommable;
private boolean vendable;
private boolean productible;
@ManyToOne(targetEntity = Famille.class,fetch = FetchType.EAGER)
@JoinColumn(name = "famille", nullable = false)
private Famille familleArt;
@ManyToOne(targetEntity = Unite.class,fetch = FetchType.EAGER)
@JoinColumn(name = "unite", nullable = false)
private Unite unite;
private double prix;

@OneToMany(cascade = {CascadeType.REMOVE}, mappedBy = "article")
List<Stocker> stks;

    public Article() {
        // TODO Auto-generated constructor stub
    }
    
    public Article(String codArt, String libArt, String libCou, boolean achetable, boolean numSerie,
            boolean stockable, boolean perissable, boolean consommable, boolean venArt, boolean prod, Famille familleArt,
            Unite unite) {
        super();
        this.codArt = codArt;
        this.libArt = libArt;
        this.libCou = libCou;
        this.achetable = achetable;
        this.numSerie = numSerie;
        this.stockable = stockable;
        this.perissable = perissable;
        this.consommable = consommable;
        this.vendable = venArt;
        this.familleArt = familleArt;
        this.productible= prod;
        this.unite = unite;
    }
}

Repository

@Repository
public interface ArticleRepo extends JpaRepository<Article, String>{
    
    @Query(value = "SELECT * FROM article WHERE achetable", nativeQuery = true)
    public List<Article> articlesAchetables();
    
    @Query(value="SELECT * FROM article WHERE achetable AND famille IN "
            + "(SELECT familles_cod_fam FROM familles_autorisees WHERE magasin_cod_mag like :mg)", nativeQuery = true)
    public List<Article> articlesAchetablesParMagasin(String mg);
}

Service

public class ArticleService {
    @Autowired
    private ArticleRepo repo;
    public List<Article> list(){
            return repo.findAll();
    }
    public List<Article> listAchetable(){
        return repo.articlesAchetables();
    }
    public List<Article> listAchetablesParMagasin(String mg){
        return repo.articlesAchetablesParMagasin(mg);
    }
}

Controler

import java.util.List;
import sih.stoc.entities.Article;
@RestController
@CrossOrigin
@RequestMapping(path = "basestock/")
public class StocBaseController {
    @Autowired
    private  ArticleService articleService;

// ---ControllerArticle
    @GetMapping(path = "article/list")
    public List<Article> listarticle() {
        return this.articleService.list();
    }
    
    @GetMapping("article/achetable/list")
    public List<Article> listArticlesAchetable(){
        return this.articleService.listAchetable();
    }
    
    @GetMapping("magasin/{mg}/article/achetable/list")
    public List<Article> listeArticlesAchetablesParMagasin(@PathVariable(name = "mg", required = true) String mg){
        return articleService.listAchetablesParMagasin(mg);
    }
}

Here are codesat front end

service

@Injectable({
      providedIn: 'root'
})

export class SMagasin {
      hot!: string;
      constructor(public us: Tools, public http: HttpClient) { }

      listAchetable() {
            if (this.us.jtoken == null) {
                  this.us.loadToken();
            }
            return this.http.get<Article[]>(this.us.hote + 'basestock/article/achetable/list', { headers: new HttpHeaders({ 'Authorization': this.us.jtoken }) });
      }

      listAchetableParMag(mg: String) {
            if (this.us.jtoken == null) {
                  this.us.loadToken();
            }
            return this.http.get<Article[]>(this.us.hote + 'basestock/magasin/' + mg + '/article/achetable/list', { headers: new HttpHeaders({ 'Authorization': this.us.jtoken }) });
      }
}

ArticleComponent.ts

export class ArticleComponent implements OnInit {
  familles: Famille[] = [];
  unites: Unite[] = [];
  uni = new Unite('', '');
  tabUni: DataTables.Settings = {};
  dtUni: Subject<any> = new Subject<any>();

  art: Article = new Article('', '', '', false, false, false, false, false, false, false, new Famille('', ''), new Unite('', ''));
  articles: Article[] = [];
  tabArt: DataTables.Settings = {};
  dtArt: Subject<any> = new Subject<any>();

  constructor(public tr: ToastrService, public us: Tools, public mg: SMagasin, public mod: NgbModal, public sanit: DomSanitizer) {

this.mg.listUnit().subscribe(data => {
      this.unites = data;
      this.dtUni.next;
      setTimeout(() => {
        $('#tUni').DataTable({
          pagingType: 'full_numbers',
          pageLength: 5,
          processing: true,
          search: true,
          searching: true,
          lengthMenu: [5, 10, 25],
          language: {
            lengthMenu: 'Affichage de _MENU_ lignes par page',
            zeroRecords: 'Aucune ligne trouvée - Desolé',
            info: 'Affichage de la page _PAGE_ sur _PAGES_',
            infoEmpty: 'Pas de ligne trouvée',
            infoFiltered: '(Filtré à partie de _MAX_ lignes)',
            search: 'Rechercher',
            loadingRecords: 'Chargement en cours...',
            paginate: {
              first: 'Début',
              last: 'Fin',
              next: 'Suivant',
              previous: 'Précédent'
            }
          }
        });
      }, 1);
    }, error => console.error(error));

    this.mg.listArt().subscribe(data => {
      this.articles = data;
      this.dtArt.next;          }
        });
      }, 1);
    }, error => console.error(error));

  }

on request to load articles, browser throws error

> net::IMCOMPLET_CHUNKED_ENCODING 200.

and the backend sends a lot of lines like this

at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728) ~[jackson-databind-2.12.5.jar:2.12.5] at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:770) ~[jackson-databind-2.12.5.jar:2.12.5] at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:178) ~[jackson-databind-2.12.5.jar:2.12.5] at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728) ~[jackson-databind-2.12.5.jar:2.12.5]......

Can someone explain to me what is going on, please? However, there are other loads that pass without problem