communication link failure in java
package com.retrieve;
import java.sql.*;

public class retrieve{
     public static void main(String[] args) {
             System.out.println("Getting All Rows from a table!");
             Connection con = null;
             String url = "jdbc:mysql://192.168.1.249:3306/";
             String db = "login";
             String driver = "com.mysql.jdbc.Driver";
             String user = "root";
             String pass = "";
             try{
             Class.forName(driver).newInstance();
             con = DriverManager.getConnection(url+db, user, pass);
             try{
             Statement st = con.createStatement();
             ResultSet res = st.executeQuery("SELECT * FROM  login");
             System.out.println("username: " + "t" + "password: ");
             while (res.next()) {
                     String s = res.getString("username");
             String s1 = res.getString("password");
             System.out.println(s1 + "tt" + s);
             }
             con.close();
             }
             catch (SQLException s){
             System.out.println("SQL code does not execute.");
             }
             }
             catch (Exception e){
             e.printStackTrace();
             }
             }
           }

GRANT ALL ON YOUR_DB.* TO 'root'@'192.168.1.249';