Order entity with @onetomany relationship

Order.java

package com.example.demo;
import javax.persistence.*;
import java.util.List;

@Entity
@Table(name = "orders")
public class Order {
  @Id
  int id;
  
  @ManyToOne
  @JoinColumn(name = "customer_id")
  Customer customer;
  
  @OneToMany(mappedBy = "order")
  List<OrderLineItem> lineItems;
  
  public Order() {
  }
}