JPA删除子项而不删除父项

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

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

    // getters and setters
}

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

    @ManyToOne
    @JoinColumn(name = "parent_id")
    private Parent parent;

    // getters and setters
}

// 在使用JPA进行删除操作时
Parent parent = entityManager.find(Parent.class, parentId);
Child child = entityManager.find(Child.class, childId);

parent.getChildren().remove(child);
entityManager.remove(child);