<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib prefix = "c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h1>Hello World!</h1>
<h3>Example of Tag lib Directive</h3>
<hr>
<c:set var = "name" value="Software Engineer"></c:set>
<c:out value = "${name}"></c:out>
</body>
</html>
上面是我的 JSP 代码，它在左下角的 netbeans 12.6 版本中向我显示通知。
servlet api 类不在类路径中，一些 scriptlet 编辑功能被禁用
这是我的 tomcat 服务器通知。
Type Exception Report
Message org.apache.jasper.JasperException: Failed to load or instantiate TagLibraryValidator class: [org.apache.taglibs.standard.tlv.JstlCoreTLV]
Description The server encountered an unexpected condition that prevented it from fulfilling the request.
Exception
org.apache.jasper.JasperException: org.apache.jasper.JasperException: Failed to load or instantiate TagLibraryValidator class: [org.apache.taglibs.standard.tlv.JstlCoreTLV]
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:589)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:425)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:380)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:328)
jakarta.servlet.http.HttpServlet.service(HttpServlet.java:792)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Root Cause
org.apache.jasper.JasperException: Failed to load or instantiate TagLibraryValidator class: [org.apache.taglibs.standard.tlv.JstlCoreTLV]
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:54)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:294)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:142)
org.apache.jasper.compiler.TagLibraryInfoImpl.createValidator(TagLibraryInfoImpl.java:360)
org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:195)
org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:429)
org.apache.jasper.compiler.Parser.parseDirective(Parser.java:487)
org.apache.jasper.compiler.Parser.parseElements(Parser.java:1444)
org.apache.jasper.compiler.Parser.parse(Parser.java:138)
org.apache.jasper.compiler.ParserController.doParse(ParserController.java:245)
org.apache.jasper.compiler.ParserController.parse(ParserController.java:106)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:206)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:391)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:367)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:351)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:603)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:399)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:380)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:328)
jakarta.servlet.http.HttpServlet.service(HttpServlet.java:792)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Root Cause