Jar scrambling problem

Before you see a project can not inherit class Simpletagsuppert class, and will Jsp-api.jar (do not know Servlet-api.jar can put) into the Jdk/jre/lib/ext package results not only the JSP that is being written cannot run, The previous web app also fails to run, and Java.lang.ClassNotFoundException appears: Javax.el.ELResolver abnormal, later found that the original is the reason, but still do not know how to solve this problem, refer to the forum http://bbs.csdn.net/topics/370019554?page=1

Jar scrambling problem