绝对uri：http://java.sun.com/jstl/core无法在web.xml或与此应用程序一起部署的jar文件中解决 [英] The absolute uri: http://java.sun.com/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application

问题描述

我需要一些帮助，我想做一个程序，并使用

i need some help, i wanted to do a program and used

if(session.getAttribute("logged")!="1"){ 
 String err="You must be logged in!!"; 
 request.setAttribute( "error", err ); 
 String nextJSP = "/login.jsp"; 
 RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(nextJSP); 
dispatcher.forward(request,response); }

％>

在jsp但是我的老板告诉我要使用jstl，所以我把它改成了：

In a jsp, but my boss told me to use jstl So i changed it to:

<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
 <c:if test="${session.getAttribute('logged')!=null}"> 
      <jsp:forward page="login.jsp">
      </jsp:forward>
 </c:if>
 <c:if test="${session.getAttribute('logged')==null}">
      <jsp:forward page="princ.jsp"> </jsp:forward>
 </c:if>

我得到一个讨厌的错误：

And i get a nasty error:

 "org.apache.jasper.JasperException: The absolute uri: http://java.sun.com/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application " 

我在互联网上搜索了一些修复程序，我把javax.servlet.jsp .jstl-api-1.2.1-javadoc.jar在我的库中，甚至把javaee.jar放在Tomcat库中，但是还没有解决这个问题，有人可以帮我吗？
PS：我有Web开发人员的Eclipse Java EE IDE（INDIGO）Tomcat 7.08

I searched the internet for some fixes, i've put the javax.servlet.jsp.jstl-api-1.2.1-javadoc.jar in my library, even put javaee.jar in the Tomcat library, but still got no solution to this, can somebody help me please? PS: i got Eclipse Java EE IDE for Web Developers.(INDIGO) Tomcat 7.08

推荐答案

您的taglib URI是

Your taglib URI is wrong.

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

此URI来自旧的和EOL的JSTL 1.0库。自JSTL 1.1起，由于EL部分从JSTL移动到JSP，因此taglib的内部工作已更改，因此您需要额外的 / jsp 。

This URI is from the old and EOL'ed JSTL 1.0 library. Since JSTL 1.1, you need an extra /jsp in the path because the taglib's internal workings were changed because the EL part was moved from JSTL to JSP:

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

此外，您试图放入 / WEB-INF中的JAR文件/ lib 是错误的。 javax.servlet.jsp.jstl-api-1.2.1-javadoc.jar 只包含JSTL javadocs和 javaee.jar 包含整个Java EE API，可能是desastreus，因为Tomcat已经部署了它（JSP / Servlet），它可能是冲突。

Further, the JAR files which you attempted to drop in /WEB-INF/lib are wrong. The javax.servlet.jsp.jstl-api-1.2.1-javadoc.jar is contains only the JSTL javadocs and the javaee.jar contains the entire Java EE API which may be desastreus because Tomcat ships with parts of it already (JSP/Servlet) which may conflict.

全部删除它们。您需要 jstl-1.2.jar 文件。

Remove them all. You need the jstl-1.2.jar file.

• 我们的JSTL标签wiki页面

• Our JSTL tag wiki page

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