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Some help with a sample SCWCD question based on Listeners.

Abhijit Ghatnekar
Greenhorn

Joined: Nov 10, 2007
Posts: 19
Hi All,

I'm very much confused by the following question and it's answer. It's a program actually.

Assume the below to be a valid HTTP Servlet that has been registered with a HTTPServletRequestAttribute Listener class.



And the output is this..

=======================
A:a->b P:a->b M:a->c
=====================

Now how is it that we get the old value of the attribute "a" even if we replace the value of the attribute a?
Is there a way, I could get the new, latest value of "a" the moment it is replaced? This could lead to a potential bug in a production code, not sure why it has to work like this.

Any thoughts?

Regds,
Abhijit.
Roel De Nijs
Bartender

Joined: Jul 19, 2004
Posts: 5406
    
  13

Please QuoteYourSources


SCJA, SCJP (1.4 | 5.0 | 6.0), SCJD
http://www.javaroe.be/
Ankur Gargg
Ranch Hand

Joined: Sep 11, 2011
Posts: 55

HI

You can use ev.getServletRequest().getAttribute("a") to get the new value thus the getValue() method has been coded to return the old value.


Regards
Ankur Garg



 
It is sorta covered in the JavaRanch Style Guide.
 
subject: Some help with a sample SCWCD question based on Listeners.