@Test
public void testNativeQueryResultTransformer() {
    doInJPA(entityManager -> {
        List<BookDTO> books = entityManager.createNativeQuery(
            "SELECT " +
            "       b.id as id, " +
            "       b.properties as properties " +
            "FROM book b")
        .unwrap(NativeQuery.class)
        .setResultTransformer(new AliasToBeanResultTransformer(BookDTO.class))
        .getResultList();

        assertEquals(1, books.size());
        BookDTO book = books.get(0);

        assertEquals(expectedPrice(), book.getProperties().get("price").asText());
    });
}
 

private PostWithXminAndXmax getPost(EntityManager entityManager, Integer id) {
    List<PostWithXminAndXmax> result = (List<PostWithXminAndXmax>) entityManager.createNativeQuery(
        "SELECT " +
        "    id, title, CAST(xmin AS text), CAST(xmax AS text) " +
        "FROM Post " +
        "WHERE id = :id")
    .setParameter("id", id)
    .unwrap(Query.class)
    .setResultTransformer(new AliasToBeanResultTransformer(PostWithXminAndXmax.class))
    .getResultList();
    return !result.isEmpty() ? result.get(0) : null;
}