CODEWITHSUNDEEP
javajsptomcatjstlel
user1884155
user1884155

Reputation: 3736

EL not working in jsp, possible mismatch between servlet api's?

I'm trying to test a simple webapp to work on a servlet container that only supports servlet api 2.3. Unfortunately, I don't have access to the 2.3 container yet so I tried testing on a recent version of tomcat.

I have the following setup:

<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd" >

Unfortunately, my EL doesn't work, they just get rendered as is. E.g.: ${2+2} is not shown as "4". Here's a snippet of my jsp page:

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>

<body>
    <h2>Hello World</h2>
    <c:out value="${2+2}"/>
</body>

</html>

So I assume this because I have mismatch between my web.xml declaration (saying it's 2.3) but my actual servlet container (tomcat) wants to use 3.0 with jstl 1.2. If I really wanted to make it work, I could update my web.xml to also use version 3.0. However, this would not work on the (other) servlet-container that is 2.3. So my question is, how can I test my 2.3 webapp, Is there an older version of tomcat that uses 2.3 aswell? Or is servlet 3.0 backwards compatible and did I misconfigure something?

Note: the actual loading of the pages and the webapp in general works fine, it's only the EL (${something}) that don't evaluate.

Upvotes: 1

Views: 1358

Answers (3)

Prashant
Prashant

Reputation: 2614

If you are using servlet version 2.3 or earlier than 2.3 then EL are by default disabled so you have to enable it means by default it is true as :

isELIgnored ="true"

you have to make it false.

but if you are useing later version of servlet than 2.3 then it is enabled by default means

isELIgnored ="false"

you can enable or desable by

<%@ page isELIgnored ="true|false" %>

at a time only one value you can give true or false.If it is true, EL expressions are ignored when they appear in static text or tag attributes. If it is false, EL expressions are evaluated by the container.

Upvotes: 4

Annamalai Thangaraj
Annamalai Thangaraj

Reputation: 532

First check do you have correct version of jstl.jar and standard.jar WEB-INF/lib folder.

Upvotes: 0

Prasanna Kumar H A
Prasanna Kumar H A

Reputation: 3431

Use isELIgnored in page tag 

<%@ page language="java" 
contentType="text/html; 
charset=ISO-8859-1" pageEncoding="ISO-8859-1"  
isELIgnored="false"%>

Upvotes: 1

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