Problema Tela de Login e senha com sql

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.border.EmptyBorder;

import javax.swing.JLabel;

import javax.swing.JTextField;

import javax.swing.JPasswordField;

import javax.swing.JButton;

private JPanel contentPane;
private JTextField txtLogin;
private JPasswordField txtSenha;

/**
 * Launch the application.
 */
public static void main(String[] args) {
	EventQueue.invokeLater(new Runnable() {
		public void run() {
			try {
				Login frame = new Login();
				frame.setVisible(true);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	});
}

/**
 * Create the frame.
 */
public Login() {
	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	setBounds(100, 100, 450, 300);
	contentPane = new JPanel();
	contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
	setContentPane(contentPane);
	contentPane.setLayout(null);
	
	JLabel lblNewLabel = new JLabel("Login:");
	lblNewLabel.setBounds(40, 64, 86, 14);
	contentPane.add(lblNewLabel);
	
	JLabel lblSenha = new JLabel("Senha:");
	lblSenha.setBounds(40, 101, 86, 14);
	contentPane.add(lblSenha);
	
	txtLogin = new JTextField();
	txtLogin.setBounds(76, 61, 167, 20);
	contentPane.add(txtLogin);
	txtLogin.setColumns(10);
	
	txtSenha = new JPasswordField();
	txtSenha.setBounds(76, 98, 167, 20);
	contentPane.add(txtSenha);
	
	JButton btnNewButton = new JButton("Acessar");
	btnNewButton.addActionListener(new ActionListener() {
		public void actionPerformed(ActionEvent arg0) {
			
		Acesso cl = new Acesso();
		cl.Acesso(txtLogin.getText(),txtSenha.getText());
		if (cl.acesso == true) {
			
			TelaInicial tl = new TelaInicial();
			tl.show();
			tl.setExtendedState(new TelaInicial().MAXIMIZED_BOTH);
			dispose();
			
		}
		if (cl.acesso == false) {
			
			txtLogin.setText("");
			txtSenha.setText("");
			txtLogin.requestFocus();
			
		}
		
		cl.acesso = false;
			
		}
	});
	btnNewButton.setBounds(53, 163, 107, 35);
	contentPane.add(btnNewButton);
	
	JButton btnCancelar = new JButton("Cancelar");
	btnCancelar.addActionListener(new ActionListener() {
		public void actionPerformed(ActionEvent e) {
			
			System.exit(0);
		}
	});
	btnCancelar.setBounds(170, 163, 131, 35);
	contentPane.add(btnCancelar);
}

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.border.EmptyBorder;

private JPanel contentPane;

/**
 * Launch the application.
 */
public static void main(String[] args) {
	EventQueue.invokeLater(new Runnable() {
		public void run() {
			try {
				TelaInicial frame = new TelaInicial();
				frame.setVisible(true);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	});
}

/**
 * Create the frame.
 */
public TelaInicial() {
	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	setBounds(100, 100, 450, 300);
	contentPane = new JPanel();
	contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
	contentPane.setLayout(new BorderLayout(0, 0));
	setContentPane(contentPane);
}

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import com.mysql.jdbc.Statement;

import javax.swing.JOptionPane;

public boolean acesso;

public void Acesso(String login, String senha) {
	
	Connection con = null; 
	Statement consulta = null;
	ResultSet tabela = null;
	
	
	try {
		
		Class.forName("con.mysql.jdbc.Driver");
		con = DriverManager.getConnection("jdbc:mysql://localhost/login","root","");
		consulta = (Statement) con.createStatement();
		tabela = consulta.executeQuery("select login, senha from tbl_usuario where login='"+login+"'and senha='"+senha+"");
		if (tabela.next()) {
			
			JOptionPane.showMessageDialog(null, "Usuario e Senha Corretos");
			acesso = true;
			
		}else{
			
			JOptionPane.showMessageDialog(null, "Usuario e Senha Incorretos");
			acesso = false;
			
		}

	}catch (ClassNotFoundException | SQLException e) {
		
	
}


}}