Connection mysql

package cz.relisoft.mysql;

import java.sql.SQLException;

import org.bukkit.configuration.file.FileConfiguration;

import cz.relisoft.plugin.Main;

import java.io.File;
import java.sql.Connection;
import java.sql.DriverManager;;

public class CustomConnection {

    private Connection connection;
    private String host,db,pass,user;
    private int port = 3306;

    private Main plugin;

    public CustomConnection(Main main) {
        this.plugin = main;
        FileConfiguration config = main.getConfig();
        config.addDefault("port", 3306);
        config.addDefault("host","localhost");
        config.addDefault("user", "root");
        config.addDefault("pass","");
        config.addDefault("db", "test");
        config.options().copyDefaults(true);
        main.saveConfig();

        this.host = config.getString("host");
        this.db = config.getString("db");
        this.pass = config.getString("pass");
        this.user = config.getString("user");
        this.port = config.getInt("port");
    }

    public void connect() throws SQLException, ClassNotFoundException {
        if(connection != null && !connection.isClosed()) {
            return;
        }

        synchronized (this) {
            if(connection != null && !connection.isClosed()) {
                return;
            }
            Class.forName("com.mysql.jdbc.Driver");
            connection = DriverManager.getConnection("jdbc:mysql://"+this.host+":"+this.port+"/"+this.db, this.user, this.pass);
        }
    }

    public Connection getConnection() throws ClassNotFoundException, SQLException {
        if(connection == null || connection.isClosed()) {
            this.connect();
        }
        return this.connection;
    }

    public void close() throws SQLException {
        this.connection.close();
    }

}