jsp 그누보드 하는데요

2020.09.19 14:15:08 3439 (121.♡.♡.73)

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<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<link rel="stylesheet" href="/css/install.css">
<title>설치</title>
</head>
<body>
<script>
function frm_install_submit(f)
{
if (f.prefix.value == '')
{
alert('TABLE 접두어를 입력하십시오.'); f.mysql_db.focus(); return false;
}

>>http://java.sun.com/jsp/jstl/core" % 코어를 못불러오네요

core cannot be resolved in either web.xml or the jar files deployed with this application

type Exception report

message 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

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: 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
	org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:55)
	org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:277)
	org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:75)
	org.apache.jasper.compiler.TagLibraryInfoImpl.generateTldResourcePath(TagLibraryInfoImpl.java:250)
	org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:125)
	org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:421)
	org.apache.jasper.compiler.Parser.parseDirective(Parser.java:479)
	org.apache.jasper.compiler.Parser.parseElements(Parser.java:1435)
	org.apache.jasper.compiler.Parser.parse(Parser.java:139)
	org.apache.jasper.compiler.ParserController.doParse(ParserController.java:227)
	org.apache.jasper.compiler.ParserController.parse(ParserController.java:100)
	org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:201)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:358)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:338)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:325)
	org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:580)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:363)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

note The full stack trace of the root cause is available in the Apache Tomcat/8.0.50 logs.

고수님들 있을까요??