hibernate max map

public String getMaxProbability() {

StringBuffer hql = new StringBuffer("select new map( max(prize.winningRate) as winningRate ,prize.uuid as uuid  ) from Prize prize where 1=1 ");
List<Object> params = new ArrayList<Object>();
hql.append(" and prize.isdeleted = 0 ");
hql.append(" order by prize.uuid Asc");
List<Map<String, Object>> mapList = this.getHibernateTemplate().find(hql.toString(),params.toArray());
Map<String, Object> map =new HashMap<String, Object>();

if(mapList.size() > 0){
map = mapList.get(0);
return String.valueOf(map.get("uuid"));
}
return "-1";
}