java - @WebServlet don't work. getting null value in getAttribute in jsp -
i'm trying set list request attribute print in jsp file. getattrubute in showmentors.jsp giving null value. problem controller or web.xml? please? think controller dose not working.
controller.java
@webservlet("/controller") public class controller extends httpservlet { private static final long serialversionuid = 1l; private static sessionfactory factory = null; //set managers mentors mentorsmanager = mentors.getinstance(); public static sessionfactory getsessionfactroy() { try{ if(factory == null) factory = new annotationconfiguration().configure().buildsessionfactory(); } catch(hibernateexception e){ system.err.println(e.getmessage()); } finally{ return factory; } } /** * @see httpservlet#httpservlet() */ public controller() { super(); // todo auto-generated constructor stub } protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception { printwriter out = response.getwriter();//writer of response string pathbuffer = request.getpathinfo();//the url switch(pathbuffer){ //switch url case "/showmentors": list<mentor> c = mentorsmanager.getallmentors(); request.getsession().setattribute("mymentors", c); // sending coupons view use request.getservletcontext().getrequestdispatcher("showmentors.jsp").forward(request, response); break; web.xml
<?xml version="1.0" encoding="utf-8"?> <web-app version="3.1" metadata-complete="false" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xsi:schemalocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"> <display-name>webperachproject</display-name> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>controller</servlet-name> <servlet-class>com.sakhnin.implementations.controller</servlet-class> </servlet> <servlet> <servlet-name>index</servlet-name> <jsp-file>/jspfiles/index.jsp</jsp-file> </servlet> <servlet> <servlet-name>mentor</servlet-name> <jsp-file>/jspfiles/mentor.jsp</jsp-file> </servlet> <servlet> <servlet-name>showmentors</servlet-name> <jsp-file>/jspfiles/showmentors.jsp</jsp-file> </servlet> <servlet-mapping> <servlet-name>index</servlet-name> <url-pattern>/jspfiles/index.jsp</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>showmentors</servlet-name> <url-pattern>/jspfiles/showmentors.jsp</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>mentor</servlet-name> <url-pattern>/jspfiles/mentors.jsp</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>controller</servlet-name> <url-pattern>/jspfiles/*</url-pattern> </servlet-mapping> </web-app> showmentors.jsp
<%@page import="java.util.list"%> <%@ page import="com.sakhnin.classes.*"%> <%@ page import="com.sakhnin.implementations.*"%> <%@ page language="java" contenttype="text/html; charset=windows-1255" pageencoding="windows-1255"%> <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=windows-1255"> <title>all mentors</title> <link type="text/css" rel="stylesheet" href="../stylefile/ourstyle.css" /> <link type="text/css" rel="stylesheet" href="../stylefile/bootstrap.css" /> <link rel="stylesheet" href="http://code.jquery.com/mobile/1.3.1/jquery.mobile-1.3.1.min.css" /> <script src="http://code.jquery.com/jquery-1.9.1.min.js"></script> <script src="http://code.jquery.com/mobile/1.3.1/jquery.mobile-1.3.1.min.js"></script> </head> <body> <div data-role="header" data-theme="b"> <h1>show mentors page</h1> <div data-role="navbar"> <ul> <li><a href="admincontrolpanel" data-icon="home">all mentors </a></li> </ul> </div> </div> <!-- display coupons page --> <div data-role="content" data-theme="b"> <table class="table table-hover table-striped" id="mentors" height="100%" width="100%" border="3px" bordercolor="blue"> <thead> <tr style="color: green;"> <th>fullname</th> </tr> </thead> <tbody> aaaaaaaaaaaaaaa hhhhhhhhhhhhhhhh <% // retrieves first page , display //list<mentor> m = (list<mentor>)request.getattribute("mymentors"); list<mentor> m = (list<mentor>)request.getsession().getattribute("mymentors"); system.out.println(m); %> <% if (m!=null){ for(mentor mentor : m) { %> <td>cccccccccccccccc<br> <tr> <td><%= mentor.getfullname()%><br> </tr> <% } }%> xxxxxxxxxxxxxxxxxxxxx </tbody> </table> </div> <div data-role="footer" data-theme="b"> <h4>by: aseel & rema</h4> </div> </body> </html>
first make sure client calling /controller first, not showmentors.jsp
check if mentorsmanager.getallmentors(); returns non-null value, maybe attribute mymentors set correctly, content/value c null;
and suggest if it's request-scope attribute, may pass argument/context using requests context, rather session.
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