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?
Jim A.
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