@Entity
public class Parent {
    @Id
    @GeneratedValue
    private Long id;

    @OneToMany(mappedBy = "parent", cascade = CascadeType.ALL, orphanRemoval = true)
    private List<Child> children;

@Entity
public class Child {
    @Id
    @GeneratedValue
    private Long id;

    @ManyToOne
    private Parent parent;

        var p = new Parent();
        entityManager.persist(p);

        for (var parent : entityManager.createQuery("from Parent", Parent.class).getResultList()) {
            System.out.println(parent.getChildren());
        }