使用Java调用过程时，显示参数编号2不是OUT参数

Question

I am trying to call a stored procedure using java.

I am a beginner in stored procedure. So tried the same first in mysql terminal

mysql> delimiter // 
mysql> create procedure get_EmployeeName(IN cust_id INT,OUT cust_name varchar(20)) 
    -> begin 
    -> select name into cust_name from CUSTOMERS where id = cust_id; 
    -> end // 
Query OK, 0 rows affected (0.11 sec) 

mysql> delimiter ; 
mysql> call get_EmployeeName(1,@cust_name); 
Query OK, 1 row affected (0.08 sec) 
mysql> select @cust_name; 
+------------+ 
| @cust_name | 
+------------+ 
| A          | 
+------------+ 
1 row in set (0.01 sec) 

I am able to get the output.

Now tried using Java.

Create procedure statement

stmt.execute("create procedure mydb.WhoAreThey(IN id INT, OUT name VARCHAR(20)) begin select Name into name from employees where EmployeeID = id; end");

Procedure Call

Not sure if my procedure call is right or wrong

        String IN = "1000";
        cs = con.prepareCall("{call WhoAreThey(?,?)}");
        cs.setString(1, IN);
        cs.registerOutParameter(2, Types.VARCHAR);
        cs.execute();

Above call gives an sqlexception "SQLException: Parameter number 2 is not an OUT parameter"

UPDATE

worked by calling " cs = con.prepareCall("{call mydb.WhoAreThey(?,?)}");"

But When I did select @name ..it is showing "Null".

I expected my out as "David Walker" from employees table as EmployeeID is 1000.

mysql> select * from employees;
+------------+--------------+--------+---------------------+
| EmployeeID | Name         | Office | CreateTime          |
+------------+--------------+--------+---------------------+
|       1000 | David Walker | HQ101  | 2016-12-21 13:00:37 |
|       1001 | Paul Martin  | HQ101  | 2016-12-21 13:00:37 |
+------------+--------------+--------+---------------------+
2 rows in set (0.00 sec)

Am I checking in a wrong way(select @name)

Answer 1

Instead of calling WhoAreThey call mydb.WhoAreThey

 String IN = "1000";
    cs = con.prepareCall("{call mydb.WhoAreThey(?,?)}");
    cs.setString(1, IN);
    cs.registerOutParameter(2, Types.VARCHAR);
    cs.execute();

To fetch the value of OUT param USE:

String name = cs.getString(2);