size of list in JSTL

[pankaj kapoor]

I am trying to print the size of list with the following code in jsp
<%
List ll = new ArrayList();
ll.add("India");
ll.add("Pakistan");
%>
<c ut value="${fn:length(ll)}" />
but I am not able to do so.

The tablib I have included in jsp is
<%@ taglib uri='http://java.sun.com/jstl/functions' prefix='fn' %>
but error 'broken link' comes

I have included standard.jar in classpath

could anyone suggest to me what is the solution to this problem.

Thanks in advance

[Balasubramani Dharmalingam]

try this,

 
 
<%@ page import="java.util.*" %>
<%@ page isELIgnored="false" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
                                                                                                                             
                                                                                                                             
                                                                                                                             
<%
List ll = new ArrayList();
ll.add("India");
ll.add("Pakistan");
        request.setAttribute( "ll" , ll ) ;
%>
<c :-o	 ut value="${fn:length(ll)}" />
 

   

and also u have to add jstl.jar and standard.jar to the WEB-INF/lib folder of your application.

Above code was tested in :
Tomcat 5.0.28 ,JSTL 1.1

[Bear Bibeault]

Check the JSP FAQ to make sure that you have everything set up properly for a JSP 2.0 and Servlets 2.4 web application.

[Bear Bibeault]

This one.

[pankaj kapoor]

I tried this code
<%@ page import="java.util.*" %><%@ page isELIgnored="false" %><%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <%List ll = new ArrayList();ll.add("India");ll.add("Pakistan"); request.setAttribute( "ll" , ll ) ;%><c ut value="${fn:length(ll)}"

but it does not work. I suppose there is some problem with the JSP version I am using.(JSP 1.2) but even 1.2 version supports this.

[Pradeep bhatt]

Using attributes like isELIgnored="false" would not work in JSP 1.2.

[Stefan Evans]

In JSTL1.0 there is no way using EL to get the size of a collection.
You can tell if it is empty or not, but thats it.

This is one of the flaws that JSTL1.1 fixed (through providing the functions)

[Bear Bibeault]

To do what you want to do you need JSP 2.0 and JSTL 1.1. Anything earlier will not support the fn:length function.

Your web app also needs to be a Servlet 2.4 web app. See the JSP FAQ I pointed to.