Primefaces datascroller only loads once with Lazy

Question

Guys, I started using dataScroller today with Lazy of the first faces

<p:dataScroller  ajax="true" id="listaDiarios" 
    chunkSize="3"  lazy="true"
    styleClass='ui-datagrid-no-border'
    value="#{managedBeanUsuario.lazyRegistrosDiarios}"
    var="registro">

The load I did as follows:

LazyDataModel<RegistroDiario> registros = new LazyDataModel<RegistroDiario>() {

    private static final long serialVersionUID = -4742720028771554420L;
   @Override
public List<RegistroDiario> load(int first, int pageSize,
        String sortField, SortOrder sortOrder,
        Map<String, Object> filters) {
    // TODO Auto-generated method stub
       System.out.println("entrei load "+ first);
       System.out.println("entrei size "+ pageSize); 
       System.out.println("qnt linhas "+ this.getRowCount()); 

         return RegistroDiarioDao.getAllLastRegistroDiarioVelho(first);

}
};

And in DAO the method is like this:

public static ArrayList<RegistroDiario> getAllLastRegistroDiarioVelho(int inicio) {

    EntityManager em = HibernateManageFactory.getFactory() 
            .createEntityManager();

    Query query = em.createQuery(
            "select u from RegistroDiario u order by u.dtRegistro desc",
            RegistroDiario.class);
    query.setMaxResults(3); 
    query.setFirstResult(inicio);
    @SuppressWarnings("unchecked")

    ArrayList<RegistroDiario> registrosDiarios = (ArrayList<RegistroDiario>) query.getResultList();

    em.close();
    return registrosDiarios;
}

He brings the records, so far so good.

I want him to always bring 3-3, the first time he brings 3, when he gives the scroll bar, he brings 3 more and then he stops to go get more records. Being that I have much more than 6 records in the bank.

I don’t know if I’m doing it right or wrong, so I wanted your help, I want him to bring all the bank records, but going 3 by 3