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public List<Resource> getResourceByTag(Tag tag,int start) {
        Query query = entityManager.createQuery(
                "SELECT r from Resource r WHERE ?1" +
                "IN (SELECT t from r.res_tags t)" +
                "ORDER BY r.res_update_date DESC");
        query.setParameter(1, tag);
        query.setFirstResult(start);
        query.setMaxResults(Constants.ITEMS_PER_PAGE);
        return query.getResultList();
    }
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"from Resource r WHERE ?1 " +
                "IN (from r.res_tags) " +
                "ORDER BY r.res_update_date DESC");
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