org.springframework.dao.InvalidDataAccessApiUsageException： org.hibernate.loader.MultipleBagFetchException： can can同時(shí)獲取多個(gè)包： [Order.items， OrderItem.options];以上是我在加入三個(gè)表時(shí)遇到的異常，如下所示。OrderItemOption.java@Entitypublic class OrderItemOption {  @Id  @GeneratedValue(strategy = GenerationType.IDENTITY)  @Column(name = "item_option_id")  private Long id;  @Column(name = "item_id", nullable = false)  private Long itemId;  @ManyToOne(fetch = FetchType.LAZY)  @JoinColumn(      name = "item_id",      referencedColumnName = "item_id",      insertable = false,      updatable = false  )  private OrderItem orderItem;}訂單項(xiàng).java@Entitypublic class OrderItem {  @Id  @GeneratedValue(strategy = GenerationType.IDENTITY)  @Column(name = "item_id")  private Long id;  @Column(name = "order_id", nullable = false)  private Long orderId;  @ManyToOne(fetch = FetchType.LAZY)  @JoinColumn(      name = "order_id",      referencedColumnName = "order_id",      insertable = false,      updatable = false,      nullable = false  )  private Order order;  @OneToMany(fetch = FetchType.LAZY, mappedBy = "orderItem")  @OrderBy("item_option_id ASC")  private List<OrderItemOption> options;}訂購(gòu).java@Entitypublic class Order {  @Id  @Column(name = "order_id", nullable = false)  private Long id;  @OneToMany(fetch = FetchType.LAZY, mappedBy = "order")  @OrderBy("item_id ASC")  private List<OrderItem> items;}這是我的QueryDSL代碼，可以一次加入它們。final QOrder order = QOrder.order;final QOrderItem item = QOrderItem.orderItem;final QOrderItemOption option = QOrderItemOption.orderItemOption;from(order).leftJoin(order.items, item).fetchJoin().leftJoin(item.options, option).fetchJoin().where(    order.id.eq(orderId)        .and(item.id.in(itemIds))        .and(option.id.in(optionIds))).fetchOne())我試圖做的是獲取包含過濾關(guān)系的Order對(duì)象，以便我可以通過訂單對(duì)象訪問過濾的子級(jí)。關(guān)系的類型應(yīng)該是列表，而不是集合。例如，order.getItems（）.get（0）.getOptions.get（0）我怎樣才能實(shí)現(xiàn)這個(gè)目標(biāo)？