eclipse 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
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The absolute uri: http://java.sun.com/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application
提问by rosu alin
i need some help, i wanted to do a program and used
我需要一些帮助，我想做一个程序并使用
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); }
%>
%>
In a jsp, but my boss told me to use jstl So i changed it to:
在jsp中，但我的老板告诉我使用jstl所以我将其更改为：
<%@ 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>
And i get a nasty error:
我得到一个讨厌的错误：
"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 "
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
我在互联网上搜索了一些修复程序，我将 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，但仍然没有解决方案这个，有人可以帮我吗？PS：我有 Eclipse Java EE IDE for Web Developers.(INDIGO) Tomcat 7.08
回答by BalusC
Your taglib URI is wrong.
你的 taglib URI 是错误的。
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
This URI is from the old and EOL'ed JSTL 1.0 library. Since JSTL 1.1, you need an extra /jspin the path because the taglib's internal workings were changed because the EL part was moved from JSTL to JSP:
此 URI 来自旧的 EOL JSTL 1.0 库。从 JSTL 1.1 开始，您需要/jsp在路径中添加额外的内容，因为标记库的内部工作发生了变化，因为 EL 部分已从 JSTL 移至 JSP：
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
Further, the JAR files which you attempted to drop in /WEB-INF/libare wrong. The javax.servlet.jsp.jstl-api-1.2.1-javadoc.jaris contains only the JSTL javadocs and the javaee.jarcontains the entire Java EE API which may be desastreus because Tomcat ships with parts of it already (JSP/Servlet) which may conflict.
此外，您尝试放入的 JAR 文件/WEB-INF/lib是错误的。该javax.servlet.jsp.jstl-api-1.2.1-javadoc.jar是只包含JSTL的javadoc和javaee.jar包含整个Java EE API这可能是因为desastreus Tomcat的附带已经（JSP / Servlet的），这可能它的一部分发生冲突。
Remove them all. You need the jstl-1.2.jarfile.
将它们全部删除。您需要jstl-1.2.jar文件。
See also:
也可以看看：
回答by Ramesh PVK
I think you should include jstl impl jar. Here is one location of the jar i found:
我认为你应该包括 jstl impl jar。这是我找到的罐子的一个位置：
回答by rickz
Also, instead of
另外，代替
<c:if test="${session.getAttribute('logged')!=null}">
use one of the following
使用以下之一
<c:if test="${sessionScoped.logged != null}">
<c:if test="${sessionScoped[logged] != null}">
<c:if test="${logged != null}">
