Struts - Problem with nested iteration or double iteration

Rudi <>
Tue, 30 Sep 2008 08:35:53 -0700 (PDT)
Hi Everyone,

  I'm trying to implement a nested iteration in a jsp and can't seem
to get this to work.

  Can anyone please help?

  Below is all the code. Thanks in advance.

Best regards,



<%@ page language="java" pageEncoding="ISO-8859-1"%>
<%@ taglib uri=""
<%@ taglib uri=""
<%@ taglib uri=""
prefix="logic" %>
<%@ taglib uri=""
prefix="nested" %>

<%@ taglib prefix="c" uri="" %>

        <title>Show book list</title>
<table border="1">

            <td>Book name</td>
        <%-- check if book exists and display message or iterate over books
        <logic:empty name="bookListForm" property="books">
                <td colspan="5">No books available</td>
        <logic:notEmpty name="bookListForm" property="books">
            <logic:iterate name="bookListForm" property="books" id="book">
                    <%-- print out the book informations --%>
                    <td><bean:write name="book" property="author" /></td>
                    <td><bean:write name="book" property="title" /></td>
                    <td><html:checkbox disabled="true" name="book"
property="available" />

                    <%-- print out the edit and delete link for each book --%>
                    <td><html:link action="" paramName="book"
                        paramProperty="id" paramId="id">Edit</html:link></td>
                    <td><html:link action=""
                        paramProperty="id" paramId="id">Delete</html:link></td>

        <%-- end iterate --%>




One Iteration
  <c:forEach var="book" items="${books}">
    <LI>Name = ${}

  <c:forEach var="book" items="${books}">
    <LI>Name = <c:out value="${}" />

<!-- I tried this to get at least the top level name, but didn't work.
I'm not sure
     how to setup the inner forEach correctly. I tried but also get
     Error message is can't find bean -->

  <c:forEach var="bookSection" items="$
    <LI>Name = <c:out value="${booksection.sectionName}" />

<!-- The code below doesn't work. Error message is unbalanced
nested:nest tag -->

<nested:nest property="bookSection" />
  <b><nested:write property="sectionName" /></b>
  <nested:iterate property="book" />
      <LI><nested:write property="title" /></LI>



package com.mycompany.client;

public class Book implements {

    private static final long serialVersionUID = 1L;

    private long id;
    private String title;
    private String author;
    private String available;

    public Book() {}

    public Book(long id, String title, String author, String available) { = id;
        this.title = title; = author;
        this.available = available;

    public long getId() {
        return id;

    public void setId(long id) { = id;

    public String getTitle() {
        return title;

    public void setTitle(String title) {
        this.title = title;

    public String getAuthor() {
        return author;

    public void setAuthor(String author) { = author;

    public String getAvailable() {
        return available;

    public void setAvailable(String available) {
        this.available = available;



package com.mycompany.client;

import java.util.ArrayList;
import java.util.List;

public class BookSection implements {

    private static final long serialVersionUID = 1L;

    private List<Book> bookSec = new ArrayList<Book>();
    private Book latestBook;
    private String sectionName = null;

    public List<Book> getBookSec() {
        return bookSec;

    public void setBookSec(List<Book> bookSec) {
        this.bookSec = bookSec;

    public Book getLatestBook() {
        return latestBook;

    public void setLatestBook(Book latestBook) {
        this.latestBook = latestBook;

    public String getsSectionName() {
        return sectionName;

    public void setSectionName(String sectionName) {
        this.sectionName = sectionName;



package com.mycompany.client.struts.form;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import com.mycompany.client.Book;
import com.mycompany.client.BookSection;

public class BookListForm extends ActionForm {

    private Collection books;
    private List<BookSection> bookSectionList;

    public Collection getBooks() {
        return books;

    public void setBooks(Collection books) {
        this.books = books;

    public void reset(ActionMapping mapping, HttpServletRequest request)
        books = new ArrayList();

    public List<BookSection> getBookSectionList() {
        return bookSectionList;

    public void setBookSectionList(List<BookSection> bookSectionList) {
        this.bookSectionList = bookSectionList;



package com.mycompany.client.struts.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.swing.text.html.HTMLDocument.Iterator;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import org.apache.struts.action.DynaActionForm;

import com.mycompany.client.Book;
import com.mycompany.client.struts.form.BookListForm;
import com.mycompany.client.hibernate.*;

import org.hibernate.*;
import org.hibernate.criterion.Projections;

import com.mycompany.client.BookSection;

import java.util.*;

import java.util.ArrayList;
import java.util.List;

public class BookListAction extends Action {

    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response) {

        BookListForm bookListForm = (BookListForm) form;

        SessionFactory factory = null;
        Session session = null;
        Collection <Book> books = new ArrayList<Book>();
        String author = null;
        String title = null;

          try {

         factory = HibernateSessionFactory.getSessionFactory();
         session = (Session) factory.openSession();

         List<Book>bks = session.createQuery("from Book ").list();

         System.out.println("Query Size = " + bks.size());

              if (bks.isEmpty()) {
             System.out.println("Could not get book using embedded
              } else {
             for (int i = 0; i < bks.size(); i++) {
                 System.out.println("The title is " +

              // Declare a BookSection List
              List<BookSection> booksList = new ArrayList<BookSection>();

              // Declare a BookSection
              BookSection bs1 = new BookSection();
              List<Book> sectionBook = new ArrayList<Book>();

              Book book1 = new Book();
              book1.setAuthor("Tom Clancy");
              book1.setTitle("The Hunt For Red October");


              Book book1Latest = new Book();
              book1Latest.setAuthor("Agatha Christie");
              book1Latest.setTitle("And Then There Were None");

              // Declare another BookSection
              BookSection bs2 = new BookSection();
              List<Book> sectionBook2 = new ArrayList<Book>();

              Book book2 = new Book();
              book2.setAuthor("Naomi Wolf");
              book2.setTitle("Give Me Liberty");


              Book book2Latest = new Book();
              book2Latest.setAuthor("Bob Woodward");
              book2Latest.setTitle("The War Within");


              // Reset and assign the list to the Form attribute
              // and the request
              bookListForm.reset(mapping, request);
              request.setAttribute("books", bks);

              request.setAttribute("booksect", booksList);


          } finally {

          return mapping.findForward("showList");


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