Hibernate One-to-Many Unidirectional Conversion Generates Redundant Updates

I have defined two classes: "Parent and Child". The parent may have a list of children.

@Entity
public class Parent {
    @Id
    @GeneratedValue(...)
    @SequenceGenerator(...)
    private long id;

    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
    @JoinColumn(name = "parent_id", referencedColumnName = "id", nullable = false)
    private List<Child> children;

    public Parent() {
        children = new ArrayList<Child>();
    }

    public void addChild(Child child) { children.add(child); }
}

@Entity
public class Child {
    @Id
    @GeneratedValue(...)
    @SequenceGenerator(...)
    private long id;

    // The "Child" table in the db also has a not-null "parent_id" column.
}

      

        
        
        
      

    

If I add the list to the list and keep the parent, everything works as expected: Hibernate gets the sequence values, stores the parent, and then stores all the children.

However, after doing all this, it will update all children by setting "parent_id" to the value that was already set in insert!

The generated SQL looks like this:

insert into PARENT (id) values (1)
insert into CHILD (parent_id, id) values (1, 1)
insert into CHILD (parent_id, id) values (1, 2)
insert into CHILD (parent_id, id) values (1, 3)
update CHILD set parent_id = 1 WHERE id = 1
update CHILD set parent_id = 1 WHERE id = 2
update CHILD set parent_id = 1 WHERE id = 3

      

        
        
        
      

    

If I make this association bi-directional it works fine, but then I need a parent reference in my child class and something I want to avoid.

The repository is a Spring Data JPA datastore:

public interface ParentRepository extends PagingAndSortingRepository<Parent, Long> {}

      

        
        
        
      

    

(simplified) code that creates and stores objects:

Parent parent = new Parent();
parent.addChild(new Child());
parent.addChild(new Child());
repo.save(parent);

      

        
        
        
      

    

Any suggestions?