无法在嵌入式Jetty服务器中加载JSTL taglib [英] cannot load JSTL taglib within embedded Jetty server
问题描述
我正在编写一个在嵌入式Jetty实例中运行的Web应用程序。
I am writing a web application that runs within an embedded Jetty instance.
当我尝试执行JSTL语句时,收到以下异常:
When I attempt to execute a JSTL statement, I receive the following exception:
org.apache.jasper.JasperException:/index.jsp(1,63)PWC6188:绝对uri: http://java.sun.com/jsp/jstl/core 使用此应用程序部署
我在类路径上有以下jar
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
- 码头-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
- 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
M y web.xml如下所示:
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>
我的代码如下所示:
<%@ 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>
我开始使用这样的嵌入式Jetty服务器:
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();
我花了两天时间尝试各种jar文件,web.xml配置和标签组合库声明,但无济于事。
I spent the past two days experimenting with various combinations of jar files, web.xml configurations, and tag library declarations, but to no avail.
如何在完整的JSTL支持下启动并运行嵌入式Jetty服务器?
How can I get an embedded Jetty server up and running with full JSTL support?
推荐答案
jstl taglib必须位于服务器类路径上。您可以在启动服务器之前将类加载器添加到当前的类加载器链。这是start.jar启动jetty服务器时使用的原则。
The jstl taglibs must be on server classpath. You can add a classloader to current classloader chain before start the server. That's the principle used by start.jar when it start a jetty server.
ClassLoader currentClassLoader = Thread.currentThread().getContextClassLoader();
URL urlTaglibs = new File(PATH_TO_TAGLIBS).toURI().toURL();
URLClassLoader newClassLoader = new URLClassLoader(new URL[]{urlTaglibs},currentClassLoader);
Thread.currentThread().setContextClassLoader(newClassLoader);
server.start();
您还应该将其添加到java start命令行参数。
You should also add it to java start command line argument.
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