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From Konstantin Kolinko <>
Subject Re: My problem: I cannot successfully get or set a session attribute from a JSP file.
Date Sun, 07 Dec 2014 00:24:23 GMT
2014-12-07 0:19 GMT+03:00 Jim Anderson <>:
> Hi to all,
> I am currently developing some server side JSP code. By and large, things
> are progressing and working well. I have gotten half way decent at debugging
> my java/javascript/jquery/jsp/HTML source code, but I have run into a
> problem in JSP where the code does not work, but I have found no clues as to
> why it is not working.
> The environment that I am working in is Tomcat 7.0.54 and I am using java
> 1.8 and jquery 1.7.2.
> What I am trying to do:
> I have html code with an embedded javascript that runs jquery code. The
> jquery code being run makes an ajax call to a JSP file on the server side,
> which I will call s.jsp. This file is a very simple file whose sole function
> is to take a registration name and query an SQL database to see if the name
> has already been used at the web site. The registration name is passed with
> a method call that looks like this:
>         regName = request.getParameter("registrationName");    [item 1]
> This all works fine for me. So far so good. If the registration name is
> good, the state of my application logic changes. I guess there are multiple
> ways to store state, but I have chosen to store the state as a session
> variable.  I searched the net and found an example of JSP code that uses the
> session object to store information as an attribute with a statement that
> looks something like:
>         session.setAttribute("logicState","nameValidated"); [item 2]
> I tried adding this line and when I now push the submit button of my HTML
> form, which calls s.jsp as an action, the application hangs (in firefox). I
> receive no error messages anywhere. Usually, when I add bad code in s.jsp I
> will get a stacktrace from firefox or error messages in the firefox debug
> console, or both. Or I will error message in my own homegrown debug code,
> but that does not happen. I know that my home grown code does not get
> called, so I can infer that the call to s.jsp is never made, but I cannot be
> 100% certain of this. I also checked my tomcat/logs directory and there was
> nothing in the log files that I would not expect.
> So my first question is:  Can I simply add item 2, above, to my jsp file and
> expect that tomcat will recognize that I am referencing the session object?
> In s.jsp, item 1, above, references the request object and tomcat handles
> that and I am expecting that it will also hand my reference to the session
> object.
> My second question is more general. My code is not working and there are no
> error messages. Can anyone speculate why this would be the case?  Is there
> any   place else I should be looking for error messages?

1. Is this reproducible if you restart Tomcat?

2. Is there anything in your access log? Was your request received by Tomcat?

Best regards,
Konstantin Kolinko

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