For the last time. What's wrong in these code ? please let your opnion.

Question

I can'nt get the data from the list in <c:forEach> tag, are you able to see the possible error?though the jsp page is returned, it is all in blank.
the codes are these:
-my conecction and where i get my list
package teste;
public class Data {
    Connection con;
    Detalhes detalhes;
    int codigo;
    ArrayList  list;
    public Data()throws Exception {       
        try {
            Class.forName("org.gjt.mm.mysql.Driver");
            con = DriverManager.getConnection("jdbc:mysql://127.0.0.1/Loja?user=root&password=131283");            
        } catch (Exception ex) {
            throw new Exception(" Database not found!!" +
                ex.getMessage());
    public void remove() {
        try {
            con.close();
        } catch (SQLException ex) {
            System.out.println(ex.getMessage());
    public void setCodigo(int codigo){
        this.codigo = codigo;
    public Detalhes getDetalhes(){
        try {
            String selectStatement = "select * from produto where codigo="+codigo;
            PreparedStatement prepStmt = con.prepareStatement(selectStatement);
            ResultSet rs = prepStmt.executeQuery();
            while(rs.next())
                 detalhes = new Detalhes(rs.getString(1), rs.getString(2), rs.getDouble(3), rs.getInt(4));          
            prepStmt.close();
        }catch(Exception e){
       return detalhes;
    public ArrayList getList(){
        try {
            list = new ArrayList();
            String selectStatement = "select * from produto";
            PreparedStatement prepStmt = con.prepareStatement(selectStatement);
            ResultSet rs = prepStmt.executeQuery();
            while(rs.next()){
                 detalhes = new Detalhes(rs.getString(1), rs.getString(2), rs.getDouble(3), rs.getInt(4));          
                 list.add(detalhes);
            prepStmt.close();
            Collections.sort(list);
        }catch(Exception e){
            System.out.println(e.getMessage());
        return list;
}    - the object where i store and show the data through the methods
package teste;
public class Detalhes {
    private String titulo;
    private String autor;
    private Double preco;
    private int codigo;
    public Detalhes(String titulo, String autor, Double preco, int codigo) {
        this.titulo = titulo;
        this.autor = autor;
        this.preco = preco;
        this.codigo = codigo;       
    public String getTitulo(){
        return titulo;
    public String getAutor(){
        return autor;
    public Double getPreco(){
        return preco;
    public int getCodigo(){
        return codigo;
}-my inicial context class
package teste;
import javax.servlet.*;
public final class ContextPage implements ServletContextListener {
    private ServletContext context = null;
    NewClass bookDB;
    public void contextInitialized(ServletContextEvent event) {
        context = event.getServletContext();
        try {
            bookDB = new NewClass();
            context.setAttribute("bookDB", bookDB);
        } catch (Exception ex) {
            System.out.println("Couldn't create bookstore database bean: " +
                ex.getMessage());
    public void contextDestroyed(ServletContextEvent event) {
        context = event.getServletContext();
        NewClass dados = (NewClass) context.getAttribute("bookDB");
        if (dados != null) {
            dados.remove();
        context.removeAttribute("bookDB");              
}- my jsp page
<p><b><h1>Resultado:</h1></b></p><br>
<jsp:useBean id="dataSource" class="teste.Data" scope="page" >
       <jsp:setProperty name="dataSource" property="codigo" value="${param.theCode}"/>          
</jsp:useBean>
<c:forEach var="book" items="${dataSource.list}">
    <p><b><h1><font color="red">${book.titulo}<h1></b></p>        
    <p><b><h1><font color="red">${book.autor}<h1></b></p>        
    <p><b><h1><font color="red">${book.preco}<h1></b></p>        
    <p><b><h1><font color="red">${book.codigo}<h1></b></p>        
</c:forEach>
<c:out value=${bookList}/>

Answer 1

First of all: Don't try to force a response by using a subject "For the last time ..."
Independent of your original problem
There are a lot of things which are not correct in your code.
// i would never use the user root to access a database :-(
con = DriverManager.getConnection("jdbc:mysql://127.0.0.1/Loja?user=root&password=131283");
public Detalhes getDetalhes(){
        PreparedStatement prepStmt = null;
        ResultSet rs = null;
        try {
            // use place holders when working with prepared statements
            //  String selectStatement = "select * from produto where codigo="+codigo;
             String selectStatement = "select * from produto where codigo= ?" ;
            PreparedStatement prepStmt = con.prepareStatement(selectStatement);
            prepStmt.setInt(1,codio);
            rs = prepStmt.executeQuery();
            while(rs.next())
                 // use colomn names rather than indices
                 detalhes = new Detalhes(rs.getString(1), rs.getString(2), rs.getDouble(3), rs.getInt(4));
            rs.close();
            rs = null;
            prepStmt.close();
            prepStmt = null;
        // don't catch Exception
        }catch(SQLException sqle){
            // try and forget - is allways very useful
            Logger.getLogger(this.class.getName()).log(Level.SERVE, sqle.getMessage(), sqle);
        } finally {
           // close prepared statements and result sets within finally blocks
           if (rs != null) {
              try {
                 rs.close();
              } catch (SqlException sqle) {
                 Logger.getLogger(this.class.getName()).log(Level.FINEST , sqle.getMessage(), sqle) ;
           if (prepStmt != null) {
              try {
                   prepStmt.close();
              } catch (SQLException sqle) {
                  Logger.getLogger(this.class.getName()).log(Level.FINEST , sqle.getMessage(), sqle) ;
       return detalhes;
public final class ContextPage implements ServletContextListener {
    // don't use a member field here the context is passed within the event.
    private ServletContext context = null;
    // makes no sense to save it as member field.
    // what's NewClass ?
    NewClass bookDB;
    public void contextInitialized(ServletContextEvent event) {
        context = event.getServletContext();
        try {
            bookDB = new NewClass();
            context.setAttribute("bookDB", bookDB);
        } catch (Exception ex) {
            System.out.println("Couldn't create bookstore database bean: " +
                ex.getMessage());
    public void contextDestroyed(ServletContextEvent event) {
        context = event.getServletContext();
        NewClass dados = (NewClass) context.getAttribute("bookDB");
        if (dados != null) {
            dados.remove();
        context.removeAttribute("bookDB");              
<%-- I don't see where a bean with id dataSource and scope page is set
         if the bean does not exist a new bean will be created
         nobody ever calls the remove method of your Data bean
         what's param.theCode ?
--%>
<jsp:useBean id="dataSource" class="teste.Data" scope="page" >
       <jsp:setProperty name="dataSource" property="codigo"
value="${param.theCode}"/>          
</jsp:useBean>
}So now you've got a lot of work.
If you have fixed all the problems I've told you and you have still problems you can come
back and ask additional questions.
andi