소스파일을 가져다가 컴파일하면..


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HTTP Status 500 - java.lang.NoClassDefFoundError: Could not initialize class org.apache.jasper.el.ELContextImpl


type Exception report

message java.lang.NoClassDefFoundError: Could not initialize class org.apache.jasper.el.ELContextImpl

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

exception
javax.servlet.ServletException: java.lang.NoClassDefFoundError: Could not initialize class org.apache.jasper.el.ELContextImpl
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:349)
javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
myservlet.TestServlet.doPost(TestServlet.java:68)
myservlet.TestServlet.doGet(TestServlet.java:21)
javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

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위와 같은 에러가 나옵니다..

구글에서 검색해서 이 링크처럼 http://stackoverflow.com/questions/16624487/http-status-500-java-lang-noclassdeffounderror-could-not-initialize-class-org

'jetty' or 'jetty plugin' 를 설치해야되는건가요...?