Problemas com exercicio da apostila FJ21 execicio 9.9.2

<td><a href="mvc?logica=AlteraContatoLinkLogic&id=${contato.id}">Alterar</a></td>

package br.com.caelum.mvc.logica;
 
import javax.servlet.RequestDispatcher;  
import javax.servlet.http.HttpServletRequest;  
import javax.servlet.http.HttpServletResponse;  

import br.com.caelum.agenda.dao.ContatoDao;
import br.com.caelum.agenda.modelo.Contato;
  
public class AlteraContatoLinkLogic implements Logica{  
  
    public void executa(HttpServletRequest req, HttpServletResponse res) throws Exception {  
        Long id = Long.parseLong(req.getParameter("id"));  
        ContatoDao contatoDao = new ContatoDao();  
        Contato contato = contatoDao.pesquisarContato(id);
        req.setAttribute("nome",contato.getNome());  
        req.setAttribute("email",contato.getEmail());  
        req.setAttribute("endereco",contato.getEndereco());  
        req.setAttribute("nascimento",contato.getDataNascimento());  
  
        RequestDispatcher rd = req.getRequestDispatcher("testa-altera-mvc.jsp");  
        rd.forward(req, res);  
    }  
  
}

public Contato pesquisarContato(Long id){  
        Contato contato = new Contato();  
        try{  
            PreparedStatement stmt = this.connection.prepareStatement("select * contato where id=?");  
            ResultSet rs = stmt.executeQuery();  
            stmt.setLong(1,contato.getId());  
            contato.setId(rs.getLong("id"));  
            contato.setNome(rs.getString("nome"));  
            contato.setEmail(rs.getString("email"));  
            contato.setEndereco(rs.getString("endereco"));  
            rs.close();  
            stmt.close();  
        }catch(SQLException e){  
            throw new RuntimeException(e);  
        }  
          
        return contato;  
    }