ciao a tutti
ho fatto la seguente pagina jsp che fa da interfaccia con una servlet:
ma quando la eseguo mi da il seguente errore:codice:<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <%@page import="it.netmon.OutputBean"%><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Insert title here</title> </head> <body> <form method="post" name="myForm" action="/NetMon/AdminServlet"> <table> <tr> <td>Tipo Richiesta</td> <td> <select name="opRich"> <option value="1" <%=request.getParameter("opRich").equals("1")?"selected":"" %>>Lista Client[1]</option> <option value="2" <%=request.getParameter("opRich").equals("2")?"selected":"" %>>Info pc [2]</option> <option value="3" <%=request.getParameter("opRich").equals("3")?"selected":"" %>>Test TCP [3]</option> <option value="4" <%=request.getParameter("opRich").equals("4")?"selected":"" %>>Test UDP [4]</option> <option value="5" <%=request.getParameter("opRich").equals("5")?"selected":"" %>>Carico Centralizzato [5]</option> <option value="6" <%=request.getParameter("opRich").equals("6")?"selected":"" %>>Carico anello[6]</option> <option value="7" <%=request.getParameter("opRich").equals("7")?"selected":"" %>>Carico anello server[7]</option> </select> </td> </tr> <tr> <td><input type="submit" name="Invio" value="Invio" /></td> <td><input type="submit" onclick="document.myForm.action='/NetMon/index.jsp'" name="Reset" value="Reset"/></td> </tr> </table> </form> <% if (request.getParameter("Reset") != null) { session.setAttribute("outputBean",null); } if (request.getSession().getAttribute("outputBean") != null) { OutputBean ob = (OutputBean)request.getSession().getAttribute("outputBean"); if (request.getParameter("opRich").equals("1")) {/* stampa solo le opzioni 1*/} for(int a = 0;a < ob.getNomeClient().size();a++) { %> Nome Client: <%= ob.getNomeClient().elementAt(a)%> attraverso la porta: <%= ob.getPortClient().elementAt(a)%> <% } %> <% if (ob.getNote() != null) {%> Si è verificato un'errore: <%= ob.getNote()%> <% } } %> </body> </html>
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: java.lang.NullPointerException
org.apache.jasper.servlet.JspServletWrapper.handle JspException(JspServletWrapper.java:491)
org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.java:419)
org.apache.jasper.servlet.JspServlet.serviceJspFil e(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspSe rvlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet .java:717)
root cause
java.lang.NullPointerException
org.apache.jsp.index_jsp._jspService(index_jsp.jav a:72)
org.apache.jasper.runtime.HttpJspBase.service(Http JspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet .java:717)
org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.java:377)
org.apache.jasper.servlet.JspServlet.serviceJspFil e(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspSe rvlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet .java:717)
non riesco a capire a cosa sia dovuto...voi avete in mente qualcosa??
Rispondi quotando
