Ms ODBC driver error -- How to solve

Question

when I run a java code that has JDBC-ODBC link sometimes is sucessful but sometimes failed. Please give some advise!!!! Thanks
error msg :
SQLException: [Microsoft][ODBC Driver Manager] Driver's SQLAllocHandle on SQL_HANDLE_ENV failed
source code :
import java.sql.*;
import java.util.*;
     public class CreateCustomer {
     public static void main(String args[]) {
          String url = "jdbc:odbc:rd";
     Connection con;
     String createString;
     createString = "create table CUSTOMER " +
     "(CUST_CODE VARCHAR(10), " +
               "CUST_NAME VARCHAR(40), " +
               "CUST_ADD VARCHAR(40))";
          Statement stmt;
     try {
          Class driverClass = Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
DriverManager.registerDriver((Driver)driverClass.newInstance());
          catch (Exception t) {
                    t.printStackTrace(System.out);
     try {
     con = DriverManager.getConnection(url, info);
stmt = con.createStatement();
stmt.executeUpdate(createString);
stmt.close();
con.close();
          catch(SQLException ex)
     {  System.err.println("SQLException: " + ex.getMessage());
}

Answer 1

DriverManager.registerDriver((Driver)driverClass.newInstance());Have you tried it without this line?
Kind regards,
  Levi