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JSTL 1.2 使用遇到的问题
-
JSP 代码
<%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030" isELIgnored="true"%>
<%-- <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> --%>
<%@ taglib uri="http://java.sun.com/jstl/core_rt" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>runoob</title>
</head>
<body>
<%
out.println("Hello Runoob!");
out.println("Hello 菜鸟!");
%>
<!-- 测试一下 jstl 循环 -->
<c:forEach var="x" begin="1" end="5">
<c:out value="${x }"></c:out>
</c:forEach>
</body>
</html>
- JSTL 包的下载地址 （需要导入这两个包）
——-分割线——-
java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/LoopTag 错误：
把相应的 jstl.jar 放入到tomcat/lib目录下
java.lang.NoClassDefFoundError: org/apache/taglibs/standard/tag/rt/core/ForEachTag 错误：
把相应的 standard.jar 放入到tomcat/lib目录下
standard.jar JSTL下载
——–分割线——-
如果这样还是出现java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/LoopTag
这是因为 javax.servlet.jsp.jstl-1.2.X.jar 不包含 javax.servlet.jsp.jstl.core
去这个网址 传送门 下载jstl-1.2.jar 再放到 lib/ 下,完美解决Nice
- 新错误
HTTP Status 500 - java.lang.NoSuchMethodError: org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager.validate(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
type Exception report
message java.lang.NoSuchMethodError: org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager.validate(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
description The server encountered an internal error that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: java.lang.NoSuchMethodError: org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager.validate(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:349)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.NoSuchMethodError: org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager.validate(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
org.apache.taglibs.standard.tlv.el.ValidationUtil.validateExpression(ValidationUtil.java:26)
org.apache.taglibs.standard.tlv.el.JstlELCoreTLV.validateExpression(JstlELCoreTLV.java:26)
org.apache.taglibs.standard.tlv.JstlCoreTLV$Handler.startElement(JstlCoreTLV.java:157)
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Unknown Source)
com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source)
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.parse(Unknown Source)
javax.xml.parsers.SAXParser.parse(Unknown Source)
org.apache.taglibs.standard.tlv.JstlBaseTLV.validate(JstlBaseTLV.java:165)
org.apache.taglibs.standard.tlv.JstlCoreTLV.validate(JstlCoreTLV.java:105)
org.apache.jasper.compiler.TagLibraryInfoImpl.validate(TagLibraryInfoImpl.java:379)
org.apache.jasper.compiler.Validator.validateXmlView(Validator.java:1890)
org.apache.jasper.compiler.Validator.validateExDirectives(Validator.java:1859)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:217)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:356)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:336)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:323)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:585)
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/8.0.27 logs.
Apache Tomcat/8.0.27
所有问题解决测试成功
- eclipse 创建 web 项目 — Dynamic Web Project
- 版本 2.5以上（一下都可以试试）
- 复制两个lib到以下路径
- WebContent - WEB-INF - lib
- 1 、jstl-1.2.jar
- 2、taglibs-standard-jstlel-1.2.5.jar
- WebContent 下创建一个jsp测试文件
<%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%>
<!-- 这里是需要引入的jstl的lib -->
<%@ taglib uri="http://java.sun.com/jstl/core_rt" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>runoob</title>
</head>
<body>
<%
out.println("Hello Runoob!");
out.println("Hello 菜鸟!");
%>
<!-- 这里测试jstl调用forEach循环 -->
<c:forEach var="x" begin="1" end="5">
<c:out value="${x}"></c:out>
</c:forEach>
</body>
</html>
- eclipse 配置好tomcat可以运行测试效果
