forEach not working

[Bob Dunn]

I'm adding a forEach statement in the index.jsp page and it's not working. I'm using netbeans and item.product.description line is highlighted and the error/warning is "Multiple Breakpoints". I'm not sure what Multiple Breakpoints mean.

<c:forEach var="item" items="${products.items}">
  <tr valign="top">
    <td>${item.product.code}</td>
    <td>${item.product.description}</td>
    <td>${item.product.priceCurrencyFormat}</td>
  </tr>
</c:forEach>

package cart;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

import java.util.ArrayList;

import data.ProductIO;
import business.Product;

public class ProductsServlet extends HttpServlet
{
    
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException
    {
        HttpSession session = request.getSession();

        ArrayList<Product> products = 
                ProductIO.getProducts(
                session.getServletContext().getRealPath("WEB-INF/products.txt")); 
        session.setAttribute("products", products);
        
        String url = "/index.jsp";
        RequestDispatcher dispatcher =
                getServletContext().getRequestDispatcher(url);
        dispatcher.forward(request, response);        
    }
    
    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * 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 <code>POST</code> 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 "Short description";
    }
}

web.xml

<servlet>
        <servlet-name>ProductsServlet</servlet-name>
        <servlet-class>cart.ProductsServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>ProductsServlet</servlet-name>
        <url-pattern>/products</url-pattern>
    </servlet-mapping>

[Paul Clapham]

It means something about the breakpoints you've configured so you can do debugging in Netbeans. It doesn't mean anything about your code at all. Did the message actually prevent you from running that code, or did you just not try when you saw the message?

[Bob Dunn]

When I run it I get a 500 error.

org.apache.jasper.JasperException: An exception occurred processing JSP page /index.jsp at line 20

17: <td align="left"></td>
18: </tr>
19:
20: <c:forEach var="item" items="${products.items}">
21: <tr valign="top">
22: <td>${item.product.code}</td>
23: <td>${item.product.description}</td>


Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:519)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:428)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
cart.ProductsServlet.processRequest(ProductsServlet.java:28)
cart.ProductsServlet.doGet(ProductsServlet.java:40)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)


root cause

java.lang.NumberFormatException: For input string: "items"
java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
java.lang.Integer.parseInt(Integer.java:449)
java.lang.Integer.parseInt(Integer.java:499)
javax.el.ListELResolver.coerce(ListELResolver.java:167)