심각: Servlet.service() for servlet [jsp] in context with path [/bn] threw exception [An exception occurred processing JSP page /nfc/gate1.jsp at line 416

413:                    resbuf.put(buf2);
414:                    resbuf.flip();
415:                    ErrorHandler errorHandler = null;
416:                    SAXBuilder builder = new SAXBuilder();
417:                    if(errorHandler != null){
418:                        builder.setErrorHandler(errorHandler);
419:                       }


Stacktrace:] with root cause
java.lang.NoClassDefFoundError: Could not initialize class org.jdom2.input.sax.XMLReaders
        at org.jdom2.input.SAXBuilder.<init>(SAXBuilder.java:338)
        at org.jdom2.input.SAXBuilder.<init>(SAXBuilder.java:221)
        at org.apache.jsp.nfc.gate1_jsp._jspService(gate1_jsp.java:479)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:433)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at com.qnsolv.filter.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:49)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
        at de.javakaffee.web.msm.SessionTrackerValve.invoke(SessionTrackerValve.java:126)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
        at com.googlecode.psiprobe.Tomcat70AgentValve.invoke(Tomcat70AgentValve.java:38)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
        at org.apache.coyote.ajp.AjpAprProcessor.process(AjpAprProcessor.java:188)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
        at org.apache.tomcat.util.net.AprEndpoint$SocketWithOptionsProcessor.run(AprEndpoint.java:1731)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
        at java.lang.Thread.run(Thread.java:636)

라는 에러가뜨는대 제가 JSP는 처음이라 무슨에러인지 모르겠습니다
어떤에러인가요
이 게시물을