The relevant declaration is:

	@OneToMany(cascade=CascadeType.ALL,fetch=FetchType.EAGER)
	@JoinColumn(referencedColumnName="id",name="foo_id")
	@OrderColumn
	List<Bar> bars;

So this should be a unidirectional parent-owning-side-child association mapping. While the article is pretty interesting stuff I don’t see how this helps with the problem. The problem is not locking from my point of view.