使用JSTL中的一個莫名其妙的問題以及解決

昨天是我初次使用JSTL,因為我是用Eclipse開發的，就按照網上的一篇入門文章做下去：

1。下載下傳并解壓了Jakarta jstl 1.1.1.

2. 将解壓後的lib目錄下的兩個jar檔案拷貝到tomcat 下的自己的應用下的WEB-INF/lib目錄下

3。将解壓後的tld目錄下的tld檔案拷貝到到tomcat 下的自己的應用下的WEB-INF/目錄下

4.修改web.xml為以下内容：

<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE web-app

PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"

"http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-app_2_4.xsd"

version="2.4">

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

<error-page>

<error-code>404</error-code>

<location>/error.jsp</location>

</error-page>

<taglib-uri>http://java.sun.com/jstl/fmt</taglib-uri>

<taglib-location>/WEB-INF/fmt.tld</taglib-location>

</taglib>

<taglib-uri>http://java.sun.com/jstl/fmt-rt</taglib-uri>

<taglib-location>/WEB-INF/fmt-rt.tld</taglib-location>

</taglib>

<taglib-uri>http://java.sun.com/jstl/core</taglib-uri>

<taglib-location>/WEB-INF/c.tld</taglib-location>

</taglib>

<taglib-uri>http://java.sun.com/jstl/core-rt</taglib-uri>

<taglib-location>/WEB-INF/c-rt.tld</taglib-location>

</taglib>

<taglib-uri>http://java.sun.com/jstl/sql</taglib-uri>

<taglib-location>/WEB-INF/sql.tld</taglib-location>

</taglib>

<taglib-uri>http://java.sun.com/jstl/sql-rt</taglib-uri>

<taglib-location>/WEB-INF/sql-rt.tld</taglib-location>

</taglib>

<taglib-uri>http://java.sun.com/jstl/x</taglib-uri>

<taglib-location>/WEB-INF/x.tld</taglib-location>

</taglib>

<taglib-uri>http://java.sun.com/jstl/x-rt</taglib-uri>

<taglib-location>/WEB-INF/x-rt.tld</taglib-location>

</taglib>

</web-app>

然後，我把例子jsp加上去(count.jsp):

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

<html>

<head>

<title>Count to 10 Example (using JSTL)</title>

</head>

<body>

<c:forEach var="i" begin="1" end="10" step="1">

<c:out value="${i}" />

<br />

</c:forEach>

</body>

</html>

然後啟動tomcat,開始測試，這時莫名其妙的錯誤出現了：

StandardWrapperValve[jsp]: Servlet.service() for servlet jsp threw exception

java.lang.AbstractMethodError: javax.servlet.jsp.PageContext.getVariableResolver()Ljavax/servlet/jsp/el/VariableResolver;

at org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:941)

at org.apache.jsp.teslib3_jsp._jspx_meth_c_out_0(teslib3_jsp.java:143)

at org.apache.jsp.teslib3_jsp._jspx_meth_c_forEach_0(teslib3_jsp.java:113)

at org.apache.jsp.teslib3_jsp._jspService(teslib3_jsp.java:65)

at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)

at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)

at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)

at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)

....

百思不得其解，查文檔有的說是compiler 不對，或者lib沒有加全，我反複檢查均未發現錯誤（java 環境：jsdk1.4.2.7)