How to resolve : Can not find the tag library descriptor for "http://java.sun.com/jsp/jstl/core"

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page import="com.library.controller.*"%>
<%@ page import="com.library.dao.*" %>
<%@ page import="java.util.*" %>
<%@ page import="java.lang.*" %>
<%@ page import="java.util.Date" %>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Return Page</title>
</head>
<body bgcolor="#aabcde">
<div align="right"><a href="Login.jsp">Logout</a></div>
<table align="center" border="2" cellspacing="3" cellpadding="3">
<tr><th>BookID</th><th>BookName</th><th>Issuedate</th><th>returndate</th></tr>
<c:forEach var="element" items="${list}">
<tr>
<td>${element.getBookid}</td><td>${element.getBookname()}</td>
<td>${element.getIssuedate()}</td><td>${element.getReturndate()}</td>
</tr>
</c:forEach>

The Eclipse IDE is showing red underline and when I focus it the tag is : can not find the library descriptor for http://java.sun.com/jsp/jstl/core

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This should work 

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

and moreover please let us know why are you importing all these class

<%@ page import="com.library.controller.*"%>
<%@ page import="com.library.dao.*" %>
<%@ page import="java.util.*" %>
<%@ page import="java.lang.*" %>
<%@ page import="java.util.Date" %>

We don't need to include java.lang as it is the default package.

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After a couple of hit and trial I use this. This works for me.

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

WARNING: As BalusC correctly mentioned, this works for JSTL 1.0.

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最佳答案

I also use this 

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

but I don't get any error.

Did you include the jstl.jar in your library? If not maybe this causing the problem. And also the 'tld' folder do you have it? And how about your web.xml did you map it?

Have a look on the info about jstl for other information.

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You are probably targeting a server without built-in JSTL support (e.g. some version of Tomcat.) You will need to provision your own JSTL tag library.

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I know this thread is a year old now but having experienced the same problem I managed to solve the problem by setting a target server for my project.

i.e. right-click on your project and select 'Properties' -> 'Targeted Runtimes' and select the server you going to run your web app on (Tomcat 6 or 7).

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I will throw one more solution into the mix. I downloaded a sample app and it was crimping only on this taglib. Turns out it didn't care for the single quotes around the attributes.

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

Once I changed those and made sure jstl.jar was in the web app, i was good to go.

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Try to add like this:

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

instead of having 

<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
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As @ace mentioned you will need the jstl.jar in your project, so if you are using maven, you could add this dependency:

<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>

Source: http://mvnrepository.com/artifact/jstl/jstl/

Hope it helps.

EDIT: Most of servers already have this dependency, if you add it using maven it may cause version conflicts (like Method/ClassNotFoundException) if you don't configure the server well, so it's better set a target server for your project, as @willix mentioned.

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I added jstl jar in a library and added it to build path and deployment assembly but it dint worked. then i simply copied my jstl jar into lib folder inside webcontent, it worked. in eclipse lib folder in included to deployment assembly by default

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paste below two jar in your /WEB-INF/lib folder and then go to project properties and go to add jar and select these two jars then click Ok, Ok

standard.jar, jstl-1.0.2.jar

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I tried "validating" de *.jsp and *.xml files in eclipse with the validate tool.

"right click on directory/file ->- validate" and it worked!

Using eclipse juno.

Hope it helps!

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Add both javax.servlet.jsp.jstl-api-1.2.1.jar and standard-1.1.2.jar

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It has nothing to do about <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>.

Just go to project and right click then project menu -> Clean the project error will definitely remove and update maven .

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You have to write as

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

Make sure you have jstl-1.0 & standard.jar BOTH files are placed in a classpath

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It will work perfectly when you will place the two required jar files under /WEB-INF/lib folder i.e. jstl-1.2.jar and javax.servlet.jsp under /WEB-INF/lib folder.

Hope it helps. :)

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I solved this issue. use below taglib 

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

and add jstl-1.2.jar

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Using the:

standard.jar

Resolves the problem.


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