> From: makaira nigricans [mailto:liame.e...@yahoo.com]
> Subject: Tomcat in-memory (session) cookie
>
> As I understood (maybe I understood wrongly)

You did.

> with every GET and POST request Tomcat "generates" cookie
> which it do not write on hard drive (so it cannot be seen
> in browser cookie manager).

You seem to be referring to HttpSession objects, which are not cookies.  
Session objects are created when a user is authenticated or when a webapp 
chooses to create a session.  An identifier (JSESSIONID) for the Session is 
passed back to the client (browser) either via a cookie or as part of the URLs 
embedded in the response.  Whether or not the browser chooses to accept or 
persist the cookie is up to the browser, not Tomcat.

> What are JSESSIONID, session, are those cookies?

Sounds like you need some basic education; try the servlet spec first:
http://jcp.org/aboutJava/communityprocess/mrel/jsr154/index2.html

Wikipedia has definitions and examples of standard computing terms such as 
cookie.

 - Chuck


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