Source code: service implementation class:

　　　　　　　String select_sql = "select cguid,(case isrz when 1 then 'PASS' when 0 then 'FAIL' end) as smrzzt from t_jb_user where mobile=?"; List<Map<String,Object>> list = ydbsDaoI.findList(select_sql, new Object[]{phoneno});//Take out the result of the query String cguid = list.get(0).get("cguid")==null?"":list.get(0).get("cguid").toString(); String smrzzt = list.get(0).get("smrzzt")==null?"":list.get(0).get("smrzzt").toString();

An error is reported because no judgment is made on whether the fetched result is empty and fetched directly   index：0，size：0

It can operate normally after adding if judgment:

　　　　　　　 String select_sql = "select cguid,(case isrz when 1 then 'PASS' when 0 then 'FAIL' end) as smrzzt from t_jb_user where mobile=?"; List<Map<String,Object>> list = ydbsDaoI.findList(select_sql, new Object[]{phoneno});
　　　　　　　if(list != null && list.size() > 0){
 //Take out the result of the query 　　String cguid = list.get(0).get("cguid")==null?"":list.get(0).get("cguid").toString(); 　　 String smrzzt = list.get(0).get("smrzzt")==null?"":list.get(0).get("smrzzt").toString();
　　　　　　　 } else {
　　　　　　　　　　　return;
　　　　　　　 }