SQLException sistema de Login

package source.DB;

import java.sql.*;
import factory.*;
import javax.swing.*;

public class LoginDB {
	
	private Connection connection;
	
	//String nomeUsuario;
	//String senha;
	
	
	public LoginDB(){
		this.connection = new ConnectionFactory().getConnection();
	}

	
	public int validaLogin(String nomeUser, String pass) throws SQLException{
		
		String sql = "SELECT nomeUsuario, senha from tabela_teste" +
					 "WHERE nomeUsuario='"+nomeUser+"'" +
					 " AND senha='"+pass+"'";
		
		int auxiliar=0;
		
		Statement stmt = null;

		
		try{
			stmt=connection.createStatement();
			ResultSet rs = stmt.executeQuery(sql);
			
			while(rs.next()){
				auxiliar=auxiliar + 1;
			}
			connection.close();
		}
		
		catch(SQLException u){
			throw new SQLException(u);
		}
		
		return auxiliar;
	}
	
}

UILogin - Action Listener do Botao de Login...

		JButton btnLogin = new JButton("Login");
		btnLogin.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				
				try{
					LoginDB logindb = new LoginDB();
					
					int count = logindb.validaLogin(textFieldNomeUsuario.getText(), passwordField.getText());
					
					if (count == 1){
						UIControle.UIControl();
					}
					else if (count > 1){
						JOptionPane.showMessageDialog(null, "Usuário duplicado no Bando de Dados. Contate o administrador.");
					}
					
				}
				catch(SQLException ex){
					JOptionPane.showMessageDialog(null, "O usuário "+textFieldNomeUsuario.getText()+" não existe no Bando de Dados!");
				}
						
			}
		});