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The moose likes Web Component Certification (SCWCD/OCPJWCD) and the fly likes sendRedirect method Big Moose Saloon
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sendRedirect method

Jayanthi Mani
Greenhorn

Joined: Dec 08, 2000
Posts: 25
Hello,
The foll: is my servlet:

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

public class hello extends HttpServlet{
public void doGet(HttpServletRequest req,HttpServletResponse res)
throws ServletException,IOException{
res.setContentType("text/html");
PrintWriter pw=res.getWriter();
pw.println("<html><body> Hello World </body></html>");
pw.flush();
res.sendRedirect("http://www.cnn.com");

}
}

When I compile and run this class 'sendRedirect' method doesn't throw an "IllegalStateException". Sun spec. defines the foll:

"If the response has already been committed, this method throws an IllegalStateException."

Can somebody explain why it is not throwing an exception? Am I doing something wrong or does it really not throw an exception as it is supposed to?

Any reply would be really appreciated.
Thanks,
Jayanthi.
Dale Seng
Ranch Hand

Joined: Mar 22, 2004
Posts: 275
Were you redirected, or did you see "Hello World"?

When I do it, I get this (in the console):

And I see "Hello World" on my browser (no redirect).

Change yours to say "Hello World 2" and make sure you're running the right version, then check the console.

--Dale--
Jayanthi Mani
Greenhorn

Joined: Dec 08, 2000
Posts: 25
Thanks for the effort of actually doing the program and suggesting a solution. I still do not get an 'IllegalStateException'. I do get 'Hello World'(or 'Hello World 2) on the browser and my console is absolutely neat and clean with no exceptions.
I normally get an 'IllegalStateException' on the browser(for eg. the session management egs. on pg.247 of HFS book) and here I get none.
But it is nice to know the program actually works the way it is supposed to!
Thanks again,
Jayanthi.
Prakash Dwivedi
Ranch Hand

Joined: Sep 28, 2002
Posts: 452
Hi Jayanthi,
Which web server are u using, also what is the version of Servlet API you are using. Under normal circumstances you should get an Error.
Also make sure that the .class file of your servlet contains
res.sendRedirect("http://www.cnn.com");
may be you added this line later, and server still contains the older version.


Prakash Dwivedi (SCJP2, SCWCD, SCBCD)
"Failure is not when you fall down, Its only when you don't get up again"
 
Don't get me started about those stupid light bulbs.
 
subject: sendRedirect method