急急急jsp程序JSTL问题The absolute uri: https://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed

linux－suse10平台，db2数据库，jdk、tomcat均配置没问题！
JSP程序中采用jstl标签，试运行提示错误：The absolute uri: https://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application。请问大家是怎么回事啊？急急急急急急！！ JSP程序