@SuppressWarnings("unchecked")
 @Transactional
 public String addTrainingTest() {
   org.hibernate.Query query =
       hibernateTemplate
           .getSessionFactory()
           .getCurrentSession()
           .createSQLQuery(
               "SELECT CONCAT('train', LPAD(SUBSTR(`id`, 6) + 1, 5, '0')) `next_id` "
                   + "FROM `test_executions` WHERE `id` LIKE 'train%' ORDER BY "
                   + "SUBSTR(`id`, 6) + 0 DESC LIMIT 1")
           .addScalar("next_id", Hibernate.STRING);
   hibernateTemplate.setMaxResults(1);
   List<String> l = query.list();
   hibernateTemplate.setMaxResults(0);
   String nextId = l.size() > 0 ? l.get(0) : null;
   TestExecution t = new TestExecution();
   t.setId(nextId);
   t.setTestId(1);
   this.saveTestExecution(t);
   return nextId;
 }