How do you map one-to-many and many-to-one relationships in Hibernate 7?

@Entity
public class Customer {
    @Id @GeneratedValue(strategy=GenerationType.IDENTITY)
    private Long id;
    private String name;

    @OneToMany(
        mappedBy="customer",
        cascade=CascadeType.ALL,
        orphanRemoval=true,
        fetch=FetchType.LAZY
    )
    private List<Order> orders = new ArrayList<>();

    public void addOrder(Order o) {
        orders.add(o);
        o.setCustomer(this);  // keep both sides in sync!
    }
}

@Entity @Table(name="orders")
public class Order {
    @Id @GeneratedValue(strategy=GenerationType.IDENTITY)
    private Long id;
    private BigDecimal total;

    @ManyToOne(fetch=FetchType.LAZY)  // explicit LAZY recommended
    @JoinColumn(name="customer_id", nullable=false)
    private Customer customer;  // owning side: holds FK
}

// Usage:
Customer c = new Customer("Alice");
c.addOrder(new Order(new BigDecimal("50")));
session.persist(c);  // cascades to orders