Send Vector class to JSP and print this Vector using JSTL

Question

Hello All!
I need your help to solve my question.
I developed a Servlet + jsp application.
I tested it in local with Apache Tomcat/6.0.20 and it works correctly.
I write and use these classes:
class for execute query, and including data page:
package MySQL;
* To change this template, choose Tools | Templates
* and open the template in the editor.
import java.util.*;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
* @author initmax
public class MySQLQuery {
    private Connection CurrentConnect; //obj for connect to databae
    private Vector VectorPageObj = new Vector(); //save array object page, after execute query
public MySQLQuery() {}
//constructor accept current conection database
public MySQLQuery(Connection CurrentConnectBase)
    CurrentConnect = CurrentConnectBase;
//method accept name table and return all info on this table
public void SelectAllField(String NameTable)
       try
         Statement st = CurrentConnect.createStatement();
         String query = ("select * from "+NameTable);
         ResultSet resultQuery = null;
         resultQuery = st.executeQuery(query);
//step in cycle after execution query, and create Vector object
           while (resultQuery.next())
              GenPageMySQL PageObj = new GenPageMySQL();
              PageObj.setId(resultQuery.getInt("id"));
              PageObj.setTheme(resultQuery.getString("theme"));
              PageObj.setPage(resultQuery.getString("page"));
              VectorPageObj.add(PageObj); //add obj in tail vector
       catch (SQLException e) {
         e.printStackTrace();
    *@set the CurrentConnect
    public void setConnection(Connection CurrentConnectBase) {
         CurrentConnect = CurrentConnectBase;
    *@get Vector object "Vector created after execute query"
     public Vector getVectorPageObj(Connection CurrentConnectBase) {
         return VectorPageObj;
}start Servlet class:
import java.util.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import MySQL.*;
public class indexServlet extends HttpServlet {
    private  String getpage;
    //Connected MySQL
    private MySQLConnect MySQLConnectObj = new MySQLConnect();
    private MySQLQuery MySQLQueryObj = new MySQLQuery();
    public void init(){
          MySQLConnectObj.DownloadDriver();
          MySQLConnectObj.Connected();
          //Use current connection, for execution query
          MySQLQueryObj.setConnection(MySQLConnectObj.GetConnection());
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException, NullPointerException  {
  //      init();
        PrintWriter out = response.getWriter();
//GET case useer
      getpage = request.getParameter("page");
      out.print("MySQLConnectObj.GetConnection() = "+MySQLConnectObj.GetConnection()); 
//Check curent connect to database
      if(MySQLConnectObj.GetConnection() != null)
           MySQLQueryObj.SelectAllField("up_menu");//execution query
           MySQLConnectObj.DisConnected();
            request.setAttribute("up_menu_theme",MySQLQueryObj.getVectorPageObj(null));
            RequestDispatcher Dispatcher = getServletContext().getRequestDispatcher("/WEB-INF/jsp/index.jsp");
            Dispatcher.forward(request, response);
      else if(MySQLConnectObj.GetConnection() == null){
            init() ;
        out.print("MySQLConnectObj.GetConnection() = "+MySQLConnectObj.GetConnection());
//        MySQLConnectObj.DisConnected();
}I forward Vector "MySQLQueryObj.getVectorPageObj(null)" to JSP, how I can print data vector using JSTL?

Answer 1

your right, I learn Java however this very Interesting!
I change code, change Vector on List
class MySQLQyery:
package MySQL;
* To change this template, choose Tools | Templates
* and open the template in the editor.
import java.util.*;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
* @author initmax
public class MySQLQuery {
    private Connection CurrentConnect; //obj for connect to databae
public MySQLQuery() {}
//constructor accept current conection database
public MySQLQuery(Connection CurrentConnectBase) {
    CurrentConnect = CurrentConnectBase;
//method accept name table and link on List, after work return all info on this table inside List
public List<GenPageMySQL> selectAllField(String NameTable, List<GenPageMySQL> ListPageObj) {
       try {
         Statement st = CurrentConnect.createStatement();
         String query = ("select * from "+NameTable);
         ResultSet resultQuery = null;
         resultQuery = st.executeQuery(query);
//step in cycle after execution query, and create Vector object
           while (resultQuery.next()) {
              GenPageMySQL PageObj = new GenPageMySQL();
              PageObj.setId(resultQuery.getInt("id"));
              PageObj.setTheme(resultQuery.getString("theme"));
              PageObj.setPage(resultQuery.getString("page"));
              ListPageObj.add(PageObj); //add obj in tail vector
       catch (SQLException e) {
         e.printStackTrace();
       return ListPageObj;
    *@set the CurrentConnect
    public void setConnection(Connection CurrentConnectBase) {
         CurrentConnect = CurrentConnectBase;
  List<GenPageMySQL> ListPageObj;
            //get List<RowObject>
            ListPageObj = MySQLQueryObj.getListPageObj();
  out.print("Size Page objects = "+ListPageObj.size());
            request.setAttribute("upMenu",ListPageObj);
            RequestDispatcher Dispatcher = getServletContext().getRequestDispatcher("/WEB-INF/jsp/index.jsp");
            Dispatcher.forward(request, response);string out.print("Size Page objects = "+ListPageObj.size()); == worked, I get count objects correct
How I can output fields Object GenPageMySQL in JSTL?
writing so:
         <c:out value="hello, Max" />
         <c:out value="${10+20/2}" />
         <c:forEach items="${upMenu}" var="Object" >     
               <c:out value="${Object.getId}"> </c:out>
         </c:forEach>
    </body>
</html>but get error:
org.apache.jasper.JasperException: An exception occurred processing JSP page /WEB-INF/jsp/index.jsp at line 36
33:          <c:forEach items="${upMenu}" var="Object" >
34:         
35:                 
36:                <c:out value="${Object.getId}"> </c:out>
37:
38:    
39:          </c:forEach>
Stacktrace:
     org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:505)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:416)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
     indexServlet.doGet(indexServlet.java:49)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:717)How I can in output print fields my Object?
Thank you for your help.