jpa - EclipseLink native query result into POJO - Missing descriptor for [Class]

Question

I'm using EclipseLink to run some Native SQL. I need to return the data into a POJO. I followed the instructions at EclipseLink Docs, but I receive the error Missing descriptor for [Class]

The query columns have been named to match the member variables of the POJO. Do I need to do some additional mapping?

POJO:

public class AnnouncementRecipientsFlattenedDTO {

        private BigDecimal announcementId;
        private String recipientAddress;
        private String type;

        public AnnouncementRecipientsFlattenedDTO() {
            super();
        }

        public AnnouncementRecipientsFlattenedDTO(BigDecimal announcementId, String recipientAddress, String type) {
            super();
            this.announcementId = announcementId;
            this.recipientAddress = recipientAddress;
            this.type = type;
        }

    ... Getters/Setters

Entity Manager call:

public List<AnnouncementRecipientsFlattenedDTO> getNormalizedRecipientsForAnnouncement(int announcementId) {
    Query query = em.createNamedQuery(AnnouncementDeliveryLog.FIND_NORMALIZED_RECIPIENTS_FOR_ANNOUNCEMENT, AnnouncementRecipientsFlattenedDTO.class);
    query.setParameter(1, announcementId);
    return query.getResultList();
}

Answer 1

I found out you can put the results of a Native Query execution into a List of Arrays that hold Objects. Then one can iterate over the list and Array elements and build the desired Entity objects.

List<Object[]> rawResultList;

    Query query =
        em.createNamedQuery(AnnouncementDeliveryLog.FIND_NORMALIZED_RECIPIENTS_FOR_ANNOUNCEMENT);
    rawResultList = query.getResultList();

    for (Object[] resultElement : rawResultList) {
        AnnouncementDeliveryLog adl = new AnnouncementDeliveryLog(getAnnouncementById(announcementId), (String)resultElement[1], (String)resultElement[2], "TO_SEND");
        persistAnnouncementDeliveryLog(adl);
    }