Class Cast Exception When Creating/Opening Question Pool

counts.put((Long) result[0], (Integer)result[1]);

public List getSubPoolSizes(final String agent) {
	  final HibernateCallback<List> hcb = session -> {
          Query q = session.createQuery("select a.questionPoolId, (select count(*) from QuestionPoolData b where b.parentPoolId=a.questionPoolId) " +
                  "from QuestionPoolData a where a.ownerId = :id");
          q.setCacheable(true);
          q.setString("id", agent);
          return q.list();
      };
	  return getHibernateTemplate().execute(hcb);
  }