Hibernate - mapping OneToOne on OrderColumn

Question

Node entity

  @OneToMany(fetch = FetchType.EAGER, cascade = {CascadeType.DETACH, CascadeType.PERSIST, CascadeType.MERGE})
@OrderColumn(name = "POSITION")
private List<Node> children = new ArrayList<>();

Paragraph entity

@OneToOne(mappedBy = "paragraph")
private Node node;

When I try to do paragraph.getNode() I always get a null. What I am always missing?

Answer 1

You should use "@ManyToOne" instead of @OneToOne. Also, the "mappedBy" must be on the @OneToMany, like so:

@OneToMany(mappedBy = "node" ...)

Please refer to the JPA 2.0 documentation or the "JavaEE Tutorial" for an explanation.