java.lang.OutOfMemoryError (creating Excel File with HSSF)

Hi all.
I'm trying to solve a outofmemory problem with a servlet creating a Excel file.
I've downloaded TOMCAT 5 and set
CATALINA_OPTS = -server -Xmx1200M -Xms1200M -Xss256k

Here there is the message "
"exception
 javax.servlet.ServletException: Servlet execution threw an exception
 root cause
 java.lang.OutOfMemoryError"
At the end there is a sample servlet giving this error (Note that reducing the for cycle the error disappear! and this is normal!).

Anyone could solve this problem?

Thanks!!!!!!!!!!!!!!

Thecaz








Here there is teh Servlet

import java.io.*;
import java.net.*;
import javax.servlet.*;
import javax.servlet.http.*;
import org.apache.poi.hssf.usermodel.*;

public class PrimoServlet extends HttpServlet {
    public void init(ServletConfig config) throws ServletException {
        super.init(config);  
    }

    public void destroy() {
    }

    /** Processes requests for both HTTP GET and POST methods.
     * @param request servlet request
     * @param response servlet response
     */

    protected void processRequest(HttpServletRequest request,
        HttpServletResponse response) throws ServletException, IOException {

        response.setContentType("application/vnd.ms-excel");
        HSSFWorkbook wb = new HSSFWorkbook();
        HSSFSheet sheet = wb.createSheet("new sheet");

       
        for (int i=0; i<10000; i++) {
           // Create a row and put some cells in it. Rows are 0 based.
           HSSFRow row     = sheet.createRow((short)i);

           // Create a cell and put a value in it.
           HSSFCell cell   = row.createCell((short)0);

           cell.setCellValue(1);

           // Or do it on one line.
           row.createCell((short)1).setCellValue(1.2);
           row.createCell((short)2).setCellValue("This is a string");
           row.createCell((short)3).setCellValue(true);
           row.createCell((short)4).setCellValue("This is a string1");
           row.createCell((short)5).setCellValue("This is a string2");
           row.createCell((short)6).setCellValue("This is a string1");
           row.createCell((short)7).setCellValue("This is a string2");
           row.createCell((short)8).setCellValue("This is a string1");
           row.createCell((short)9).setCellValue("This is a string2");
           row.createCell((short)10).setCellValue("This is a string1");
           row.createCell((short)11).setCellValue("This is a string2");
           row.createCell((short)12).setCellValue("This is a string1");
           row.createCell((short)13).setCellValue("This is a string2");
           row.createCell((short)14).setCellValue("This is a string1");
           row.createCell((short)15).setCellValue("This is a string2");
           row.createCell((short)16).setCellValue("This is a string1");
           row.createCell((short)17).setCellValue("This is a string2");
           row.createCell((short)20).setCellValue("This is a string1");
           row.createCell((short)21).setCellValue("This is a string2");
           row.createCell((short)22).setCellValue("This is a string1");
           row.createCell((short)23).setCellValue("This is a string2");
           row.createCell((short)24).setCellValue("This is a string1");
           row.createCell((short)25).setCellValue("This is a string2");
           row.createCell((short)26).setCellValue("This is a string1");
           row.createCell((short)27).setCellValue("This is a string2");
       }
         // Write the output
        OutputStream out = response.getOutputStream();
        wb.write(out);
        out.close();
    }

    /** Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     */

    protected void doGet(HttpServletRequest request,
        HttpServletResponse response) throws ServletException, IOException {
        processRequest(request, response);
    }

    /** Handles the HTTP POST method.
     * @param request servlet request
     * @param response servlet response
     */

    protected void doPost(HttpServletRequest request,
        HttpServletResponse response) throws ServletException, IOException {
        processRequest(request, response);
    }

    /** Returns a short description of the servlet.
     */

    public String getServletInfo() {
       return "Example to create a workbook in a servlet using HSSF";
    }
}