Session trouble

Question

I am setting up a shopping cart app and am running into some
issues... in my Application.cfc, onSessionStart I am creating an
object instance of User in the session:
<cffunction name="onSessionStart" returnType="void"
output="false">
<cfset SESSION.user =
createObject("component","User").init()>
</cffunction>
The User.cfc looks like this:
<cfcomponent>
<cffunction name="init" access="public"
returntype="struct">
<cfset var user = structNew()>
<cfset user.userID="#createuuid()#">
<cfset user.cart = createObject("component",
"ShoppingCart").init()>
<cfset user.info = createObject("component",
"UserInfo").init()>
<cfreturn user>
</cffunction>
</cfcomponent>
The ShoppingCart.cfc starts like this:
<cfcomponent output="false">
<!--- Initialize the cart’s contents --->
<cffunction name="init" access="public" output="false"
returntype="ShoppingCart">
<cfset VARIABLES.cart = ArrayNew(1)>
<cfreturn this />
</cffunction>
and the UserInfo.cfc starts like this:
<cfcomponent>
<cffunction name="init" access="public" output="false"
returntype="UserInfo">
<cfset VARIABLES.info = StructNew()>
<cfreturn this />
</cffunction>
Is this a proper way to set this up? I have gotten some
intermitant session errors (e.g. "user.info.something is an
undefined java...")
Also - are there any issues/best practices that I ought to be
aware of that could arise with customers using tabbed browsing or
multiple browser instances?
Thanks in advance!
Andy

Answer 1

Thanks!
In a similar vein, I recently switched to using Jsession
variables because I was concerned with unjudicious use of server
memory when this goes live.
Interestingly, even when a tab is closed (or a new site is
opened in the same tab) the session is still alive. It's not until
the browser is closed and restarted that the session ends. Is that
what is supposed to happen?