Forum:

java.lang.IllegalStateException in Servlet

Greenhorn

Posts: 19

posted 8 years ago

My page2.jsp (view1)

<%@ 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">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<select name="result" size=1 width=80 >   
<option value="From" selected>From</option>
<option value="A">A</option>    
<option value="B">B</option>   
</select> 
<jsp:useBean id="From" class="rrsPackage.FromToBean" scope="request">   
    <jsp:setProperty name="userData" property="*" />   
</jsp:useBean>  
<select name="result" size=1 width=80 >   
<option value="To" selected>To</option>   
<option value="B">B</option>   
<option value="A">A</option> 
</select> 
<jsp:useBean id="To" class="rrsPackage.FromToBean" scope="request">   
    <jsp:setProperty name="userData" property="*" />   
</jsp:useBean> 
<form method=get action=reqDispServlet>
Name<input type="text" name="Name"/>
<jsp:useBean id="Name" class="rrsPackage.FromToBean" scope="request">   
    <jsp:setProperty name="userData" property="*" />   
</jsp:useBean> 
Age<input type="text" name="Age"/>
<jsp:useBean id="Age" class="rrsPackage.FromToBean" scope="request">   
    <jsp:setProperty name="userData" property="*" />   
</jsp:useBean> 
Login<input type="text" name="Login"/>
Password<input type="text" name="Password"/>
Submit<input type="submit" name="Submit"/>
</form>
</body>
</html>

My controller and request dispatcher servlet :

package rrsPackage;

import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class reqDispServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		StringBuffer s1= new StringBuffer(request.getParameter("Login"));
		StringBuffer s2= new StringBuffer(request.getParameter("Password"));
		
		StringBuffer sum= s1.append(s2);
		HttpSession hs1 = request.getSession();
		hs1.setAttribute("nn", sum);
		RequestDispatcher dispatch1=request.getRequestDispatcher("page4.jsp");
		dispatch1.forward(request,response);

String s3 =request.getParameter("Name");
		HttpSession hs2 = request.getSession();
		hs2.setAttribute("name", s3);
		RequestDispatcher dispatch2=request.getRequestDispatcher("page4.jsp");
		dispatch2.forward(request,response);
				
		String s4 =request.getParameter("Age");
		HttpSession hs3 = request.getSession();
		hs3.setAttribute("age", s4);
		RequestDispatcher dispatch3=request.getRequestDispatcher("page4.jsp");
		dispatch3.forward(request,response);
		
		String s5 =request.getParameter("To");
		HttpSession hs4 = request.getSession();
		hs4.setAttribute("to", s5);
		RequestDispatcher dispatch4=request.getRequestDispatcher("page4.jsp");
		dispatch4.forward(request,response);
		
		String s6 =request.getParameter("From");
		HttpSession hs5 = request.getSession();
		hs5.setAttribute("from", s6);
		RequestDispatcher dispatch5=request.getRequestDispatcher("page4.jsp");
		dispatch5.forward(request,response);
		}
}

My page4.jsp (view2)

Heres the error:

Please help !

Seetharaman Venkatasamy

Ranch Hand

Posts: 5575

I like...

posted 8 years ago

you are trying to do operation on response which is committed already. I can see code redundancy in your servlet .

Logic:
1. get username , password and other details

2. create *a* Session , and set the details

3. at last forward[ *once *] to jsp page

P.S. Very bad Servlet!

Peyyety Avinash

Greenhorn

Posts: 19

posted 8 years ago

thanks so much for getting back !

If this is not asking too much...can you please paste back
my code kicking out the unwanted code please !

I am bad at coding yaa and definitely that was a
bad bad servlet

Aman Goel

Greenhorn

Posts: 15

posted 8 years ago

Your are forwarding the request before getting all the parameters....

Seetharaman Venkatasamy

Ranch Hand

Posts: 5575

I like...

posted 8 years ago

Since you are new, I am posting formatted code[Still you need to improve below code!]
but dont expect code! . javaranch is not a code mill

Peyyety Avinash

Greenhorn

Posts: 19

posted 8 years ago

Thanks a lot !!

javaranch is not a code mill

I got the point dude.

and, I created unecessary session and dispatch objects...Now I
figured out you just need one.
Thanks ! I am done

Peyyety Avinash

Greenhorn

Posts: 19

posted 8 years ago

I am getting directed from page2.jsp to page4.jsp (very fine, alright) after changing the controller servlet,
but all the attributes are printing null. None of the Attributes set to request object (of HttpRequest) are being fetched. why ?! please check my page4.jsp

Sony Agrawal

Ranch Hand

Posts: 143

posted 8 years ago

Have you set the attributes in request or session...

Peyyety Avinash

Greenhorn

Posts: 19

posted 8 years ago

Have you set the attributes in request or session...

Ya now i changed it to session and its working fine

Thanks !!!

Seetharaman Venkatasamy

Ranch Hand

Posts: 5575

I like...

posted 8 years ago

Peyyety Avinash wrote:Thanks !!!

You're welcome

David Newton

Author

Posts: 12617

I like...

posted 8 years ago

Peyyety Avinash wrote:hey ranchers help me out...im waiting to finish off my project assignment before 6

EaseUp. PatienceIsAVirtue.

Expecting immediate help from a forum is unreasonable.

Bear Bibeault

Marshal

Posts: 67164

169

I like...

posted 8 years ago

Plan ahead in the future. I removed your rude bump as a favor.

[Asking smart questions] [About Bear] [Books by Bear]

David Newton

Author

Posts: 12617

I like...

posted 8 years ago

But now my quote/reply doesn't make any sense.

(Even more than usual.)

Bear Bibeault

Marshal

Posts: 67164

169

I like...

posted 8 years ago

That's why I posted -- so people would know you weren't crazy.

[Asking smart questions] [About Bear] [Books by Bear]

Peyyety Avinash

Greenhorn

Posts: 19

posted 8 years ago

Oh god ! I dint know that I walked into an Institution on the Internet. reminds me of school

(I owe an explaination to the esteemed moderators..I meant fellow ranchers, help me out !...we are all growing the java livestock on the java ranch aren't we..i dint exactly put down wat i meant though..so, sorry

)

Bear Bibeault

Marshal

Posts: 67164

169

I like...

posted 8 years ago

Good manners and good communication skills never go out of style.

[Asking smart questions] [About Bear] [Books by Bear]

It is sorta covered in the JavaRanch Style Guide.

java.lang.IllegalStateException in Servlet

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