How do I update a Collection in Hibernate?

Question

I have an object called "Document" that has a one-to-many relationship with "DocumentPersonCc". I am trying to change one or more of these collections in my code, but Hibernate is not calling the update query when I expect it. It does call the update query when I change one of the regular fields (like the document subject), but even then it does not persist any of the one-to-many changes within the database. What do I need to change in order to get it to work?

Getter and setter for DocumentPersonCc:

@OneToMany(fetch = FetchType.LAZY, mappedBy = "document")
@LazyCollection(LazyCollectionOption.EXTRA)
@Sort(type = SortType.NATURAL, comparator = DocumentPersonCc.class)
public SortedSet<DocumentPersonCc> getDocumentPersonCcs() {
    return this.documentPersonCcs;
}

public void setDocumentPersonCcs(
        SortedSet<DocumentPersonCc> documentPersonCcs) {
    this.documentPersonCcs = documentPersonCcs;
}

Update Code:

public Document updateCcs(Document document) {
    Session session = HibernateUtil.getSessionFactory().getCurrentSession();
    session.beginTransaction();
    Document oldD = (Document) session.load(Document.class, document.getId());
    Hibernate.initialize(oldD.getDocumentPersonCcs());
    oldD.setDocumentPersonCcs(document.getDocumentPersonCcs());
    session.update(oldD);
    session.getTransaction().commit();
    document = this.returnDocument(document.getId());
    Hibernate.initialize(document.getDocumentPersonCcs());
    return document;
}

DocumentPersonCc's Document getter and setter:

@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "DocumentsId", nullable = false, insertable = false, updatable = false)
protected Document getDocument() {
    return this.document;
}

public void setDocument(Document document) {
    this.document = document;
}

Answer 1

Try this -

@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "document")
@LazyCollection(LazyCollectionOption.EXTRA)
@Sort(type = SortType.NATURAL, comparator = DocumentPersonCc.class)
public SortedSet<DocumentPersonCc> getDocumentPersonCcs() {
    return this.documentPersonCcs;
}

Use cascade to update child mapping