Error Calling a simple stored procedure

Question

Hello. I'm using the code below to call a simple stored procedure which returns a number. Why does it throw the exception (Also below)?
Thank you,
Alek
=======================
Code:
import java.sql.*;
public class Connect
public static void main (String[] args)
Connection conn = null;
//CallableStatement stmtMySQL = null;
long local_callkey = 0;
try
Class.forName("com.mysql.jdbc.Driver");
String userName = "abc";
String password = "def";
String url = "jdbc:mysql://mysqlserver/sxma";
Class.forName ("com.mysql.jdbc.Driver").newInstance ();
conn = DriverManager.getConnection (url, userName, password);
System.out.println ("Database connection established");
String theMySQLCall = "{?=call sxma.sp_getnumber()}";
CallableStatement stmtMySQL = conn.prepareCall(theMySQLCall);
stmtMySQL.registerOutParameter(1, Types.INTEGER);
stmtMySQL.execute();
int res = stmtMySQL.getInt(1);
if(res!=0)
throw new Exception("MySQL Query exception return code: " + String.valueOf(res) + ")");
else
local_callkey = stmtMySQL.getLong(1);
System.out.println("Local key is: " + local_callkey);
catch (Exception e)
System.err.println ("Cannot connect to database server!");
e.printStackTrace();
finally
if (conn != null)
try
conn.close ();
System.out.println ("Database connection terminated");
catch (Exception e) { /* ignore close errors */ }
================
Exception:
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
     at java.lang.String.charAt(String.java:444)
     at com.mysql.jdbc.StringUtils.indexOfIgnoreCaseRespectQuotes(StringUtils.java:951)
     at com.mysql.jdbc.DatabaseMetaData.getCallStmtParameterTypes(DatabaseMetaData.java:1277)
     at com.mysql.jdbc.DatabaseMetaData.getProcedureColumns(DatabaseMetaData.java:3640)
     at com.mysql.jdbc.CallableStatement.determineParameterTypes(CallableStatement.java:506)
     at com.mysql.jdbc.CallableStatement.<init>(CallableStatement.java:401)
     at com.mysql.jdbc.Connection.parseCallableStatement(Connection.java:4072)
     at com.mysql.jdbc.Connection.prepareCall(Connection.java:4146)
     at com.mysql.jdbc.Connection.prepareCall(Connection.java:4120)
     at Connect.main(Connect.java:20)
Thank you for your help

Answer 1

Well, there's certainly something about that line that it doesn't like.
I'm not really familiar enough with MySQL to remote-debug this one for you, but it seems to be dying while trying to reconcile that call to its metadata for the sproc. Check the sproc declaration -does it return a single out value? Or does it have a single out value in the parameter list (not the same thing, I think) ? And so on.
Also, with the amended call that I provided is the failing stack trace identical, or slightly different? If different, could you post that too please?
Finally, do you have a known good sproc call that you can sanity check against? Perhaps take one of the examples from the MySQL site and check that that will work with their reference code?