Expression Language & Eclipse warning: "items" does not support runtime expressions

Asked 20/8, 2010 at 12:54 Answered 26/11, 2012 at 13:51

i have the following JSP:

<%@ page contentType="text/html" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<%@ page isELIgnored="false"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title><c:out value="${it.title}"/></title>
    </head>
    <body>
        <c:forEach var="speaker" items="${it.speakers}" varStatus="stat">
            <ul>
                <li><c:out value="${speaker.person.firstName}" /> <c:out value="${speaker.person.lastName}" />, <c:out value="${speaker.person.address.city.zip}" /> <c:out value="${speaker.person.address.city.name}" /></li>
            </ul> 
        </c:forEach>
    </body>
</html>

Eclipse warns me about every instance of EL Expressions in my code:

Warning [line 10]: "value" does not support runtime expressions
Warning [line 13]: "items" does not support runtime expressions
...

this is however not true, EL gets evaluated correctly by the server.

Can anyone hint me in the right direction why eclipse is warning me about those EL expressions?

Marine answered 20/8, 2010 at 12:54 Comment(0)

Your taglib directive imports a JSTL 1.0 taglib. It should be JSTL 1.1 instead (note the difference in URI):

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

Allocation answered 20/8, 2010 at 14:3 Comment(5)

And ensure that web.xml is declared as at least Servlet 2.4 – Kitsch 20/8, 2010 at 18:7

@Kitsch I am getting this exception and it seems to be related to your comment : org.apache.jasper.JasperException: The absolute uri: java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application – Jezreel 31/7, 2013 at 12:46

Can you help what I need to do? – Jezreel 31/7, 2013 at 12:46

Also appropriate jstl library should be added: jstl-1.2.jar instead of jstl.jar and standard.jar #8258177 – Twopenny 16/7, 2016 at 12:24

Thanks.. this worked for me. Is there a way to add the line <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> by default to all JSP files? – Banna 20/7, 2017 at 15:18

Possible solution (found here):

Twin Libraries

The JSTL tag libraries come in two versions which differ only in the way they support the use of runtime expressions for attribute values.

In the JSTL-RT tag library, expressions are specified in the page's scripting language. This is exactly how things currently work in current tag libraries.

In the JSTL-EL tag library, expressions are specified in the JSTL expression language. An expression is a String literal in the syntax of the EL.

When using the EL tag library you cannot pass a scripting language expression for the value of an attribute. This rule makes it possible to validate the syntax of an expression at translation time.

So maybe your eclipse and the server use different tag libraries.

Moulding answered 20/8, 2010 at 13:3 Comment(0)

try this: change this:

<%@taglib prefix="c" uri="http://java.sun.com/jstl/core"%>

to yes:

<%@taglib prefix="c" uri="http://java.sun.com/jstl/core_rt"%>

hope it works for you. I got this from www.csdn.net.

Emden answered 26/11, 2012 at 13:51 Comment(1)

This is absolutely not the right solution. The proposed URI is from the JSTL "prototype" version. You should upgrade to at least JSTL 1.1. See also axtavt's answer and stackoverflow.com/tags/jstl/info – Kitsch 26/11, 2012 at 15:44

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