@Entity
@Table( name = "T_TABLE_K" )
public class ClasseK implements Serializable
{
  @Id
  @GeneratedValue( strategy = GenerationType.IDENTITY )
  @Column( name = "K_ID" )
  private Long id;
  
  @Column( name = "K_REMARQUE" )
  private String remarque;
  
  @ManyToMany
  @JoinTable( name = "TJ_JK",
          joinColumns        = @JoinColumn( name = "K_ID_FK" ), 
          inverseJoinColumns = @JoinColumn( name = "J_ID_FK" )
  )
  private List< ClasseJ > listeJ;
...