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request.getAttribute() returns null in jsp

This is a discussion on request.getAttribute() returns null in jsp within the JSP forums, part of the Web Development category; Hi Friends, I am facing a problem while trying to retrieve object from request scope. I have added a object in the request scope through a servlet and than using ...

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  #1 (permalink)  
Old 05-18-2009
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request.getAttribute() returns null in jsp
Hi Friends,


I am facing a problem while trying to retrieve object from request scope.

I have added a object in the request scope through a servlet and than using RequestDispacther i have forwarded the request to the jsp and while trying to retrive the object in the jsp i am getting null.

Please find the code below,

Servlet Code :


package com.example.web;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import com.example.web.Person;

public class UseBeanTestServlet extends HttpServlet
{
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException{

String personName = request.getParameter("personName");
Person personObj = new Person();
personObj.setName(personName);

request.setAttribute("PesronObj",personObj);

RequestDispatcher view = getServletContext().getRequestDispatcher("/UseBean.jsp");
view.forward(request,response);
}
}


Jsp Page :

<%@ page import="com.example.web.*"%>
<HTML>
<TITLE>
USE BEAN EXAMPLE
</TITLE>

<BODY>
Name : <%= ((String)request.getAttribute("personName"))%>
</BODY>

</HTML>



I have also tried adding object to servletContext, however after forwarding the request , for some reason i am not able to retrive the obj in the jsp.

Plz help me to do this..........


Thanks in advance............
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  #2 (permalink)  
Old 07-17-2009
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Join Date: Jul 2009
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Re: request.getAttribute() returns null in jsp
Hi, in the request, you are setting the attribute "personobj" and in jsp you are trying to get the attribute "personName" . kindly check that.

Quote:
Originally Posted by rijus View Post
Hi Friends,


I am facing a problem while trying to retrieve object from request scope.

I have added a object in the request scope through a servlet and than using RequestDispacther i have forwarded the request to the jsp and while trying to retrive the object in the jsp i am getting null.

Please find the code below,

Servlet Code :


package com.example.web;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import com.example.web.Person;

public class UseBeanTestServlet extends HttpServlet
{
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException{

String personName = request.getParameter("personName");
Person personObj = new Person();
personObj.setName(personName);

request.setAttribute("PesronObj",personObj);

RequestDispatcher view = getServletContext().getRequestDispatcher("/UseBean.jsp");
view.forward(request,response);
}
}


Jsp Page :

<%@ page import="com.example.web.*"%>
<HTML>
<TITLE>
USE BEAN EXAMPLE
</TITLE>

<BODY>
Name : <%= ((String)request.getAttribute("personName"))%>
</BODY>

</HTML>



I have also tried adding object to servletContext, however after forwarding the request , for some reason i am not able to retrive the obj in the jsp.

Plz help me to do this..........


Thanks in advance............
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  #3 (permalink)  
Old 07-17-2009
Expert Member
  
Join Date: May 2009
Location: Bangalore
Posts: 987
Thanks: 155
Thanked 420 Times in 201 Posts
rijus is just really nicerijus is just really nicerijus is just really nicerijus is just really nicerijus is just really nice
Re: request.getAttribute() returns null in jsp
Hi,

Yes, U r right.

The issue is already solved...

Anyways Thanks for u r effort...

The corrected jsp code...

<%@ page import="com.example.web.*"%>
<HTML>
<TITLE>
USE BEAN EXAMPLE
</TITLE>
<BODY>
Name : <%= ((Person)request.getAttribute("PesronObj"))%>
</BODY>

</HTML>


Thanks,
Riju.
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  #4 (permalink)  
Old 07-17-2009
Junior Member
  
Join Date: Jul 2009
Posts: 4
Thanks: 0
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ShruthiL is on a distinguished road
Re: request.getAttribute() returns null in jsp
Hi, Try the below. It will work.

your first jsp. (UseBeanTest.jsp)

Quote:
<HTML>
<body>
<form method = "get" action = "/UseBeanTestServlet">
<input type ="text" name = "personName" value =" "><br>
<input type ="submit" name = "AddButton"><br>
</form>
</body>
</HTML>
UseBeanTestServlet.java

Quote:
package learn;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;


public class UseBeanTestServlet extends HttpServlet
{
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException{

String personName = request.getParameter("personName");
Person personObj = new Person();
personObj.setName(personName);

request.setAttribute("PersonObj",personObj);

RequestDispatcher view = getServletContext().getRequestDispatcher("/jsp/UseBean.jsp");
view.forward(request,response);
}
}

UseBean.jsp

Quote:
<%@ page import="learn.*" %>
<HTML>
<TITLE>
USE BEAN EXAMPLE
</TITLE>

<BODY>
<%
Person p = (Person)request.getAttribute("PersonObj");
%>
Name : <%= p.getName()%>
</BODY>

</HTML>

Hope it helps.
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