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From "Howard Watson" <howa...@esgw.org>
Subject Re: Sudden IllegalStateException
Date Thu, 01 Jan 2004 17:34:09 GMT
Hello Merrill

If you're still working on this tomorrow and you want to share your code I'd be willing to
walk it through.

Howard Watson
Database Administrator
Easter Seals-Goodwill Northern Rocky Mountain
4400 Central Avenue
Great Falls, Montana  59405
(406) 771-3759
howardw@esgw.org
>>> merrill.cornish@earthlink.net 12/31/03 14:59 PM >>>
I have been developing a JSP/servlet application using Tomcat 5.0.16.  
Over the past months, I felt that I had learned enough (partially with 
the help of this mailing list) about JSP, servlets, and Tomcat that I 
could debug most of the obsticales that popped up.  Until this morning. 

I  started addnig a new servlet several "levels" down. Suddenly, I 
started getting the following error:

java.lang.IllegalStateException
	org.apache.coyote.tomcat5.CoyoteResponseFacade.sendRedirect(CoyoteResponseFacade.java:379)
	Timesheet.LoginServlet.doPost(LoginServlet.java:67)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:856)

When I launch the application, the Tomcat HTML welcome page redirects 
via a refresh to my login.jsp page via https.  That login page displays 
properly.  When I fill in the login name and password and click on 
submit, I immediately get the above exception.  The line number it 
references is the following:

      response.sendRedirect(Util.MAIN_MENU_PAGE_URL);

where Util.MAIN_MENU_PAGE_URL is "/timesheet/mainMenu.jsp", a valid page 
URL.

This sendRedirect() is the last thing the login servlet does after 
validating the login and collecting information about the logged in user 
from the database.  This has all been working for months.

The one time I got an illegal state exception before was when I 
accidently did something like session.getAttribute() when the session 
was invalid.  However,  the login servlet starts with

    HttpSession session = request.getSession(true);

which is the ONLY time it's called with a true argument.  I have also 
verified that immediately before the call to sendRedirect(), both the 
session and response variables have reasonable values.

Can any one suggest what I may have changed to suddenly get an illegal 
state exception?

Merrill Cornish


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