final Query query = entityManager.createQuery(queryString);

      if (entityManager instanceof EntityManagerImpl)
      {
         final Session session = ((EntityManagerImpl) entityManager).getActiveSession();
         if (query instanceof EJBQueryImpl)
         {
            final EJBQueryImpl<?> ejbQueryImpl = (EJBQueryImpl<?>) query;
            final DatabaseQuery databaseQuery = ejbQueryImpl.getDatabaseQuery();
            databaseQuery.prepareCall(session, new DatabaseRecord());
            String sqlString = databaseQuery.getSQLString();
         }
      }