Problem with showing a variable in jsp with <s:property/>

Hi everybody as u might know i'm one more newbie with one more problem. The thing is, i'm doing a simple shopping cart and i can't show the results of my bussines logic. I use Interceptors, Struts 2, Hibernate and Jsp tech to do this. Here is my code:

books.jsp

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<%@ page contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>

<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />


<title>Din bok</title>
<link href="indexKundMaster.css" rel="stylesheet" type="text/css" />
<link href="CSS/styles.css" rel="stylesheet" type="text/css" />

</head>

<body>
<div id="kundvagn">
<s:include value="kundvagn.jsp"></s:include>
</div>
<s:actionerror/>
<s:iterator value="books" var="book">
<div class="books">
<div class="price">
Pris <s:property value="price"/> kr
</div>

<img style="border-width: 0px; height: 160px; width: 140px;"
src= <s:url value="images/books/%{ISBN}.jpg"/> />

<div id="button-read">
<s:a href="addBookToKundvagn?book.ISBN=%{ISBN}">
<img style="border-width: 0px; height: 35px; margin-left: -15px;"
src="images/lagg_i_kundvagn_green_two.gif"/>
</s:a>

</div>

<div id="lasMerTwo">
<s:a href="readMore?book.ISBN=%{ISBN}">
<img style="border-width: 0px; height: 35px; width: 95px;"
src="images/las_mer_two.gif"/>
</s:a>
</div>
</div>
</s:iterator>
</body>
</html>

struts.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
<package name="default" extends="struts-default" namespace="/">

<interceptors>

<interceptor-stack name="baseStack">
<interceptor-ref name="defaultStack"></interceptor-ref>
<interceptor-ref name="interceptorCatcher"></interceptor-ref>
</interceptor-stack>

<interceptor name="interceptorCatcher"
class="se.fahme.interceptor.InterceptorCatcherFrom ActionClass"></interceptor>
</interceptors>

<default-interceptor-ref name="baseStack"></default-interceptor-ref>

<action name="addBookToKundvagn"
class="se.fahme.admin.action.BookAction" method="addBookToKundvagn">
<result>books.jsp</result>
</action>

</package>

</struts>

InterceptorAction.java

package se.fahme.admin.action;

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

import org.apache.struts2.interceptor.SessionAware;

import se.fahme.domain.Book;
import se.fahme.domain.User;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class InterceptorAction extends ActionSupport implements SessionAware {

private static final long serialVersionUID = 7068776566954030256L;

private List<Book> books;
protected User user;
private ArrayList<Book> kundvagn;
private int booksQuantity;
protected Book book;

Map<String, Object> realsession = null;

public void saveBookInSession(){

ActionContext.getContext().getSession().put("books InSession", getBooks());
ActionContext.getContext().getSession().put("books InKundvagn", getKundvagn());
// ActionContext.getContext().getSession().put("books Quantity", getbooksQuantity());
setKundvagnElements();

}

@SuppressWarnings("unchecked")
public void getBookFromSession(){

setBooks((List <Book>)ActionContext.getContext().getSession().get ("booksInSession"));
setKundvagn((ArrayList<Book>) ActionContext.getContext().getSession().get("books InKundvagn"));
setKundvagnElements();
// System.out.println("Get books quantity from interceptor action"+getbooksQuantity());
}

public void setKundvagnElements(){

if(kundvagn != null){
//System.out.println("Set kundvagn elements->"+getKundvagn());
setbooksQuantity(kundvagn.size());
System.out.println("Books quantity-->"+booksQuantity);
setKundvagn(kundvagn);
// System.out.println("Setting kundvagn-->"+getKundvagn());
}
}

public void setSession(Map<String, Object> realSession) {
this.realsession = realSession;

}

public List<Book> getBooks() {
return books;
}

public void setBooks(List<Book> books) {
this.books = books;
}

public ArrayList<Book> getKundvagn() {
return kundvagn;
}

public void setKundvagn(ArrayList<Book> kundvagn) {
this.kundvagn = kundvagn;
}

public int getbooksQuantity() {
return booksQuantity;
}

public void setbooksQuantity(int booksQuantity) {
this.booksQuantity = booksQuantity;
}

public Book getBook() {
return book;
}

public void setBook(Book book) {
this.book = book;
}

}

InterceptorCatcherFromActionClass.java

package se.fahme.interceptor;

import se.fahme.admin.action.InterceptorAction;
import se.fahme.utilities.HibernateUtil;

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterc eptor;

public class InterceptorCatcherFromActionClass extends AbstractInterceptor {

private static final long serialVersionUID = 410217198904230454L;

private InterceptorAction interceptorAction;

@Override
public String intercept(ActionInvocation invocation) throws Exception {

HibernateUtil.init();

interceptorAction = (InterceptorAction) invocation.getAction();

interceptorAction.getUserFromSession();
interceptorAction.getBookFromSession();

invocation.invoke();

HibernateUtil.init();

interceptorAction.saveUserInSession();
interceptorAction.saveBookInSession();

return invocation.getResultCode();
}

}

BookAction.java

package se.fahme.admin.action;

import java.util.ArrayList;

import se.fahme.domain.Book;
import se.fahme.manager.BookManager;
import se.fahme.utilities.HibernateUtil;

public class BookAction extends InterceptorAction {

/**
*
*/
private static final long serialVersionUID = 1353206556533223861L;
// private Book book;
private int ISBN;
private BookManager linkController;
private String pageForwarding;
private String publicMessage;
private String category;

public BookAction() {
linkController = new BookManager();
}

public String addBookToKundvagn(){

int isbn = book.getISBN();

if(getBooks() != null){

for (Book printBook : getBooks()){
if(isbn == printBook.getISBN()){
if(getKundvagn() == null){
setKundvagn(new ArrayList<Book>());
}
setKundvagn(new ArrayList<Book>());
getKundvagn().add(printBook);
}
setKundvagnElements();
System.out.println("Getting books quantity from bookAction"+getbooksQuantity());
}

}
return SUCCESS;
}

kundvagn.jsp

<%@ taglib prefix="s" uri="/struts-tags" %>

<link href="indexKundMaster.css" rel="stylesheet" type="text/css" />
<s:if test="booksQuantity == 0 | booksQuantity == null">
<div id="kundvagnTum"></div>
<h4 id="kundVagnTumH4">Din kundvagn är tum</h4>
</s:if>

<s:else>
<s:form action="tillKassan" method="post">
<input type="submit" name="button2" value="Till kassan" />
</s:form>

<h4>Din kundvagn innehåller</h4>
<s:property value="booksQuantity"/>
</s:else>

That's it.
Thing is, i'm only getting the if statement in the kundvagn.jsp and i'm hopping to get the else statement intead. I'm not getting a null book anywhere in my code. Can someone help me please?

I hope i posted in the right place

Greetings!!!
me