找不到“http://java.sun.com/jsp/jstl/core”的标签库描述符

Question

I'm trying to use JSTL, but I get the following error:

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

How is this caused and how can I solve it?

Answer 1

Use taglib definition in your JSP or better include it in every page by the first line.

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

There's also fix jstl-1.2 dependency in your project. Also use servlet specification at least 2.4 in your web.xml .

The maven dependencies are (maven is a open source development tool)

<dependency>
  <groupId>jstl</groupId>
  <artifactId>jstl</artifactId>
  <version>1.2</version>
  <scope>compile</scope>
</dependency>
<dependency>
  <groupId>taglibs</groupId>
  <artifactId>standard</artifactId>
  <version>1.1.2</version>
  <scope>compile</scope>
</dependency>

In the web.xml start writing

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

EDIT:

I'd like to add a note that @informatik01 has mentioned in the comment about newer version of JSTL libraries available from Maven repository: JSTL version 1.2.1 API and JSTL 1.2.1 .

Answer 2

I had the same problem even after I added jar files for jstl and standard. For me, it resolved after I added a Targeted runtime for my project.

Go to Project Properties > Targeted Runtimes and select the server you are using (Tomcat 7.0 for me).

Answer 3

create a libs folder in the inside WEB-INF directory and add jstl, standard jars as below.

Answer 4

You may try to make the folder which include jsp-s become the source folder of eclipse, that solved the same problem of mine. As below:

1. open project's properties.(right click project, then choose the Properties)
2. choose Java Build Path, select the Source tab, click Add Folder and choose the folder including your jsp-s, OK

Answer 5

您只需要在项目构建路径中包含standard.jar文件。

Answer 6

in your pom.xml just add

    <!-- jstl -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency> 

and try run

mvn eclipse:eclipse -Dwtpversion=2.0

will solve the problem

Answer 7

I have similar issue, why should we add external jar files when we are using maven?

I have already included jstl maven dependency then also I encounter error "Can not find the tag library descriptor for " http://java.sun.com/jsp/jstl/core "". Then I include following dependency then error get solve, without including any single external jar file.

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>servlet-api</artifactId>
    <version>2.5</version>
</dependency>

Answer 8

As per snapshot the main reason for error is that you are not defining c.tld in lib folder causes such error.

This lib content information about taglib