關於開發jsp標籤的環境配置問題

yeshenghai發表於2006-07-27
JS
有四個檔案,一個jsp,一個xml,一個tld,一個java文,這幾個檔案搭建一個WEB應用(在tomcat下).
1,jsp:
<%@ taglib uri="date" prefix="MyDate"%>
<!doctype html public "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title> New Document </title>
</head>

<body>
<MyDate:displayDate/>
</body>
</html>
2,java
package lesson.taglib;

import java.util.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;

public class DisplayDate extends TagSupport{
public int doStartTag() throws JspException{
JspWriter out = pageContext.getOut();
try{
out.println(new Date());
}catch(Exception e){
e.printStackTrace();
}
return SKIP_BODY;
}
}
3,xml
<?xml version="1.0" encoding="UTF-8"?>
<!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>
<taglib>
<taglib-uri>date</taglib-uri>
<taglib-location>/WEB-INF/date.tld</taglib-location>
</taglib>
</web-app>
4,tld
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN" "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
<taglib>
<tlib-version>1.2</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>date</short-name>
<description>
This is a show date taglib example.
</description>
<tag>
<name>displayDate</name>
<tag-class>lesson.taglib.DisplayDate</tag-class>
<body-content>empty</body-content>
</tag>
</taglib>

問題在於,在tomcat下執行會報錯,而且全班幾十個人,有的機子執行正常,有的機子執行不正常.重灌tomcat無濟於是.有的機子重灌了作業系統,就正常了.
不正常的原因(tomcat顯示的錯誤提示如下.):
HTTP Status 500 -

--------------------------------------------------------------------------------

type Exception report

message

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

exception

javax.servlet.ServletException: javax.servlet.jsp.tagext.TagInfo.<init>(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljavax/servlet/jsp/tagext/TagLibraryInfo;Ljavax/servlet/jsp/tagext/TagExtraInfo;[Ljavax/servlet/jsp/tagext/TagAttributeInfo;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;[Ljavax/servlet/jsp/tagext/TagVariableInfo;Z)V
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:272)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


root cause

java.lang.NoSuchMethodError: javax.servlet.jsp.tagext.TagInfo.<init>(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljavax/servlet/jsp/tagext/TagLibraryInfo;Ljavax/servlet/jsp/tagext/TagExtraInfo;[Ljavax/servlet/jsp/tagext/TagAttributeInfo;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;[Ljavax/servlet/jsp/tagext/TagVariableInfo;Z)V
org.apache.jasper.compiler.TagLibraryInfoImpl.createTagInfo(TagLibraryInfoImpl.java:435)
org.apache.jasper.compiler.TagLibraryInfoImpl.parseTLD(TagLibraryInfoImpl.java:24
org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:162)
org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:423)
org.apache.jasper.compiler.Parser.parseDirective(Parser.java:492)
org.apache.jasper.compiler.Parser.parseElements(Parser.java:1552)
org.apache.jasper.compiler.Parser.parse(Parser.java:126)
org.apache.jasper.compiler.ParserController.doParse(ParserController.java:211)
org.apache.jasper.compiler.ParserController.parse(ParserController.java:100)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:146)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:293)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


note The full stack trace of the root cause is available in the Apache Tomcat/5.5.12 logs.

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