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I am writing a web application that runs within an embedded Jetty instance.
When I attempt to execute a JSTL statement, I receive the following exception:
org.apache.jasper.JasperException: /index.jsp(1,63) PWC6188: The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application
I have the following jars on the classpath
- ant-1.6.5.jar
- ant-1.7.1.jar
- ant-launcher-1.7.1.jar
- core-3.1.1.jar
- jetty-6.1.22.jar
- jetty-util-6.1.22.jar
- jsp-2.1-6.1.14.jar
- jsp-api-2.1.jar
- jstl-1.2.jar
- servlet-api-2.5-20081211.jar
- servlet-api-2.5-6.1.14.jar
- standard-1.1.2.jar
My web.xml looks like this:
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee h77p://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">
<display-name>test</display-name>
</web-app>
My code looks like this:
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<body>
<h2>Hello World!</h2>
<%= new java.util.Date() %><br/>
${1+2}<br/>
<c:out var="${5+9}"/><br/>
</body>
</html>
I started my embedded Jetty server like this:
Server server = new Server(80);
WebAppContext context = new WebAppContext("pig-1.0-SNAPSHOT.war","/");
server.addHandler(context);
server.start();
I spent the past two days experimenting with various combinations of jar files, web.xml configurations, and tag library declarations, but to no avail.
How can I get an embedded Jetty server up and running with full JSTL support?
By adding the following code I got rid of the problem:
I am using jetty-runner 8.
Jetty 8.0, which has pushed as the default when you use jetty:run, has servlet API 3.0. As of that version of the standard, JSTL standard is supposed to be included, and these taglibs cannot be in the webapp classpath, only the standard classpath. However, 8.0.0.M0 forgot to include them.
Specifying 7.1.4.v20100610 helped for me.
In your web.xml, try changing "h77p://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" to start with "http://" and see if that fixes the error.
However, that may not be the underlying cause, since I had that same error when using jetty-maven-plugin and JSTL taglib header in my JSP:
I'm using an out-of-the-box Spring MVC template from SpringSource Tool Suite, so am not sure why the Maven plugin for Jetty chokes on it.
And only javax.servlet:jstl:1.2 is listed in my POM's dependencies, since it now obsoletes taglibs:standard:1.1.2, which was a suggestion given above.
This collides. Remove the
standard-1.1.2.jar. You should usestandard-1.1.2.jaronly withjstl-1.1.2.jar. Since JSTL 1.2 the standard JAR has been merged into JSTL JAR, resulting in a singlejstl-1.2.jarfile.