@Entity
@Table(name = "basket")
public class Basket implements Serializable {

    @Id
    private Integer id;
}

@Entity
@Table(name = "price")
public class Price implements Serializable{
    @Id
    private Integer id;
}

@Entity
@Table(name = "basket_item")
public class BasketItem implements Serializable {

    @EmbeddedId
    private BasketItemPK basketItemPk;
}

@Embeddable
public class BasketItemPK implements Serializable {
    @Column(name="basket_id", nullable = false)
    private Integer basketId;
    @Column(name="price_id", nullable = false)
    private Integer priceId;
}

      1.  BasketItem basketItem = new BasketItem();
      2.  basketItem.setBasket(basket);
      3.  basketItem.setPrice(price);
      4.  basketItem.setBasketItemPK(new basketItemPK(price.getId,basket.getId()));
      5.  basketItemService.save(basketItem);

CREATE TABLE basket_item (
  BASKET_ID  INT NOT NULL,
  PRICE_ID INT NOT NULL,
  COUNT      INT          DEFAULT 0,
  PRIMARY KEY (BASKET_ID,PRICE_ID),
  CONSTRAINT FK_BASKET_ITEM_BASKET_1 FOREIGN KEY (BASKET_ID)
  REFERENCES basket(ID),
  CONSTRAINT FK_BASKET_ITEM_PRODUCT_1 FOREIGN KEY (PRICE_ID)
  REFERENCES price(ID)
)

@Entity
@Table(name = "basket_item")
public class BasketItem implements Serializable {
    @EmbeddedId
    private BasketItemPK basketItemPk=new BasketItemPK();

    @JoinColumn(name = "basket_id", referencedColumnName = "id", insertable = false, updatable=false)
    @ManyToOne(optional = false, fetch = FetchType.EAGER)
    private Basket basket;

    @JoinColumn(name = "price_id", referencedColumnName = "id", insertable = false, updatable=false)
    @ManyToOne(optional = false, fetch = FetchType.EAGER)
    private Price price;
public BasketItem() {
    }
//geters and seters
}

   RegistrationId regId = new RegistrationId();
   regId.setStudentId(1);
   regId.setDepartment("ECE");

   StudentEntity student = new StudentEntity(); 
   student.setRegid(regId);
        
   session.save(student);