绝对 uri:http://java.sun.com/jstl/core 无法在 web.xml 或使用此应用程序部署的 jar 文件中解析 [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); }

%>

在一个jsp中，但是我的老板告诉我用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>

然后我得到一个严重的错误:

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，我已经将 javax.servlet.jsp.jstl-api-1.2.1-javadoc.jar 放在我的库中，甚至将 javaee.jar 放在 Tomcat 库中，但仍然得到没有解决方案，有人可以帮我吗?PS:我有 Eclipse Java EE IDE for Web Developers.(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 错误.

Your taglib URI is wrong.

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

这个 URI 来自旧的和 EOL 的 JSTL 1.0 库.从 JSTL 1.1 开始，路径中需要一个额外的 /jsp 因为 taglib 的内部工作发生了变化，因为 EL 部分从 JSTL 移到了 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，您尝试放入 /WEB-INF/lib 中的 JAR 文件是错误的.javax.servlet.jsp.jstl-api-1.2.1-javadoc.jar 仅包含 JSTL javadoc，javaee.jar 包含整个 Java EE API可能是 deastreus，因为 Tomcat 已经附带了它的一部分(JSP/Servlet)，这可能 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.

将它们全部删除.您需要 jstl-1.2.jar 文件.

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

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