我正在用SpringBoot和SpringDataJPA构建一个银行应用程序，在定义bankaccount类和banktransfer类之间的关系时遇到了一些问题，我找不到解决方案。银行账户有一个转账清单 List<BankTransfer> transfers . 所以这里的关系被定义为@onetomany。但在每一笔银行转账中，我都有两个银行账户参考，分别是“发送方”和“接收方”。发送方是从中提取金额的帐户，接收方是添加金额的帐户。
因此，每个银行转账都必须与bankaccount类有@manytone关系（这种关系正好是二对一关系）。所以这里的难点是如何Map两个银行账户（发送方和接收方）？在bankaccount类的@onetomany注解中设置什么作为mappedby字段。
以下是我的课程：
bankaccount类：

@Entity
@Table(name = "bank_account")
public class BankAccount {

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "account_Sequence")
    @SequenceGenerator(name = "account_Sequeence", sequenceName = "BANK_ACCOUNT_SEQ")
    @Column(name ="id")
    private Long id;

    @NotNull
    @Column(name ="account_number")
    private String accountNumber;

    @NotNull
    @Enumerated
    @Column(name ="type")
    private AccountType type;

    @Column(name ="currency")
    private Currency currency;

    @NotNull
    @Column(name ="balance")
    private BigDecimal balance;

    @NotNull
    @Column(name ="date_created")
    protected Date dateCreated;

    @ManyToOne(cascade = {CascadeType.PERSIST, CascadeType.MERGE,
                          CascadeType.DETACH, CascadeType.REFRESH})
    @JoinColumn(name="client_id")
    protected Client client;

    @Column(name ="employee_id")
    private Employee accountManager;

    @OneToMany(fetch = FetchType.LAZY,
               mappedBy = "sender",
               cascade = {CascadeType.PERSIST, CascadeType.MERGE,
                          CascadeType.DETACH, CascadeType.REFRESH})
    protected List<BankTransfer> transfers;
}

银行转账类：

@Entity
@Table(name="transfer")
public class BankTransfer {
    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "transaction_Sequence")
    @SequenceGenerator(name = "transaction_Sequeence", sequenceName = "TRANSACTION_SEQ")
    private Long id;

    @NotNull
    @Column(name = "amount")
    private BigDecimal amount;

    @NotNull
    @ManyToOne(targetEntity = BankAccount.class,
               fetch = FetchType.LAZY,
               cascade = {CascadeType.PERSIST, CascadeType.MERGE,
                           CascadeType.DETACH, CascadeType.REFRESH})
    @JoinColumn(name = "sender_id")
    private BankAccount sender;

    @NotNull
    @ManyToOne(targetEntity = BankAccount.class,
               fetch = FetchType.LAZY,
               cascade = {CascadeType.PERSIST, CascadeType.MERGE,
                          CascadeType.DETACH, CascadeType.REFRESH})
    @JoinColumn(name = "receiver_id")
    private BankAccount receiver;

    @NotNull
    @Column(name = "created_at")
    private Date createdAt;
}

如你所见，我有：

@OneToMany(fetch = FetchType.LAZY,
                   mappedBy = "sender",
                   cascade = {CascadeType.PERSIST, CascadeType.MERGE,
                              CascadeType.DETACH, CascadeType.REFRESH})
protected List<BankTransfer> transfers;

在bankaccount类中尝试Map BankAccount sender banktransfer类中的字段：

@NotNull
@ManyToOne(targetEntity = BankAccount.class,
           fetch = FetchType.LAZY,
           cascade = {CascadeType.PERSIST, CascadeType.MERGE,
                           CascadeType.DETACH, CascadeType.REFRESH})
@JoinColumn(name = "sender_id")
private BankAccount sender;

我还要Map BankAccount receiver banktransfer类中的字段。我试过这个例子：

mappedBy = {"sender", "receiver"},

或者尝试添加2@onetomany注解，但这些似乎是错误的。
你能帮我解决这个问题吗。也许我需要分别重新定义实体和oracle数据库表。我对rdbms比较陌生，我正在构建这个应用程序以获得更多的使用经验。