Hibernate как сохранить сущность

@Entity
@Table(name = "clients")
public class Client {
 
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
 
    @NotNull
    private String name;
 
    @NotNull
    private String lastName;
 
    @OneToMany(fetch = FetchType.EAGER, cascade = {CascadeType.ALL, CascadeType.PERSIST})
    @JoinColumn(name = "client_fk")
    private List<Account> accounts = new ArrayList<>();
}

@Entity
@Table(name = "accounts")
public class Account {
 
    @Id
    @NotNull
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
 
    private BigDecimal amount;
 
    @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinColumn(name = "account_fk")
    private List<Transaction> transactions = new ArrayList<Transaction>();
 
    @OneToOne(fetch = FetchType.EAGER, cascade = CascadeType.PERSIST)
    @JoinColumn(name = "currency_fk", nullable = false)
    private Currency currency;
}

@Entity
@Table(name = "currencys")
public class Currency {
 
    @Id
    @NotNull
    @Column(name = "currency", length = 3)
    private String name;
 
    @Column(name = "exchange_rates", nullable = false)
    private BigDecimal rates;
}

@Entity
@Table(name = "acc_trans")
public class Transaction {
 
    @Id
    @NotNull
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
 
    @NotNull
    private BigDecimal amount;
 
    @Column(name = "trans_desc", length = 50)
    private String description;
 
    @Column(name = "date", nullable = false)
    @CreationTimestamp
    private Date creationDate;
}

 public void addClient(Client client) {
        try {
            em.getTransaction().begin();
            em.persist(client);
            Currency uah = gedCurrency("UAH");
            Currency usd = gedCurrency("USD");
            Currency eur = gedCurrency("EUR");
            
            Account accUAH = new Account(new BigDecimal(0), uah);
            Account accUSD = new Account(new BigDecimal(0), usd);
            Account accEUR = new Account(new BigDecimal(0), eur);
 
            client.getAccounts().add(accUAH);
            client.getAccounts().add(accUSD);
            client.getAccounts().add(accEUR);
            em.getTransaction().commit();
        }catch (HibernateException e){
            if(em.getTransaction()!=null) em.getTransaction().rollback();
            e.printStackTrace();
        }
    }

@Entity
@Table(name = "clients")
public class Client {
 
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
 
    @NotNull
    private String name;
 
    @NotNull
    private String lastName;
 
    @OneToMany(fetch = FetchType.EAGER, cascade = {CascadeType.ALL, CascadeType.PERSIST})
    @JoinColumn(name = "client_fk")
    @Cascade(CascadeType.SAVE_UPDATE)
    private List<Account> accounts = new ArrayList<>();
}