发现应用不能用了，反复测试发现页面中不能包含 taglib，否则会出现以下提示：

HTTP Status 500 –

type Exception report

message

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

exception

org.apache.jasper.JasperException: /index.jsp(1,1) Unable to read TLD “META-INF/tlds/struts-bean.tld” from JAR file “file:/C:/home/chaifeng/eclipse_workspace/cnlife365_tracker/web/WEB-INF/lib/struts.jar”: org.apache.jasper.JasperException: Failed to load or instantiate TagExtraInfo class: org.apache.struts.taglib.bean.CookieTei
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375)
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)
com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118)
com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:75)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

root cause

org.apache.jasper.JasperException: /index.jsp(1,1) Unable to read TLD “META-INF/tlds/struts-bean.tld” from JAR file “file:/C:/home/chaifeng/eclipse_workspace/cnlife365_tracker/web/WEB-INF/lib/struts.jar”: org.apache.jasper.JasperException: Failed to load or instantiate TagExtraInfo class: org.apache.struts.taglib.bean.CookieTei
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:405)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:86)
org.apache.jasper.compiler.Parser.processIncludeDirective(Parser.java:339)
org.apache.jasper.compiler.Parser.parseIncludeDirective(Parser.java:372)
org.apache.jasper.compiler.Parser.parseDirective(Parser.java:484)
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:155)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:295)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:276)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:264)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:303)
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)
com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118)
com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:75)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

note The full stack trace of the root cause is available in the Apache Tomcat/5.5.17 logs.
Apache Tomcat/5.5.17

想了半天，刚才没有改动代码。折腾了半天才想起来，只是更新了一下lib下的jar，一时图方便就把另外一个目录下的jar全都复制过来了，包括 jsp-api.jar。
把它删除就ok了，记录一下。