HTTP Status 500 - javax.servlet.ServletException

運行某個jsp頁面時提示

type Exception report

message javax.servlet.ServletException: java.lang.NoClassDefFoundError: org/apache/taglibs/standard/tag/common/core/ChooseTag

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

exception org.apache.jasper.JasperException: javax.servlet.ServletException: java.lang.NoClassDefFoundError: org/apache/taglibs/standard/tag/common/core/ChooseTag

	org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:556)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:462)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
	cn.itcast.servlet.FoodTypeServlet.goTo(FoodTypeServlet.java:186)
	cn.itcast.servlet.FoodTypeServlet.list(FoodTypeServlet.java:112)
	cn.itcast.servlet.FoodTypeServlet.doGet(FoodTypeServlet.java:51)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:731)

或者提示
The absolute uri: http://java.sun.com/jsp/jstl/core 
cannot be resolved in either web.xml or the jar files deployed with this application

直接將jstl.jar跟standard.jar包放在lib 重啟服務器就行了。項目一定要重新發布 意思就是說你用了jstl標簽沒有導入
該包。也可以在web.xml直接引用jar的網址。配置一下就行了。重點：一定要在tomcat發布的目錄-lib目錄下看有沒有
這兩個jar.如果不出意外應該是沒事了。