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From "Martin Gainty" <>
Subject Re: Retrieve certain session data inside a servlet
Date Sat, 03 Jun 2006 12:32:29 GMT
Good Morning Eric and Carlos-

Indeed there is a way to enable CrossContext communication via the 
CrossContext="true" directive inside the Context tag
<Context path="/pluto" crossContext="true" />

This capability is available from combined engineering staff from Sun 
Microsystems and the IBM Corporation.
Tthe specific JSR-168 spec is published at

For specific implementation details I would encourage you to look at John 
Lewis' article available at


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----- Original Message ----- 
From: "Eric Haszlakiewicz" <>
To: "Carlos Alonso Vega" <>
Cc: "Tomcat Users List" <>
Sent: Friday, June 02, 2006 9:11 PM
Subject: Re: Retrieve certain session data inside a servlet

> On Fri, Jun 02, 2006 at 11:15:03AM +0200, Carlos Alonso Vega wrote:
>> Bob,
>> Thanks for the reply. My problem is that the session info I need is not
>> of the session that makes the request. I need to check other sessions in
>> the same context.  I can use the request because it is in the same
>> context, so the manager is the same.
>> This servlet is called internally from the app, and checks if some
>> session exists. It is similar to the case of obtaining all active
>> sessions from one context using the manager inside the servlet code
>> (findSessions). If someone have this piece of code (or similar), it will
>> serve me.
> To do something like that you need to do it yourself.  i.e. store a
> HashTable in the application context, then add and remove sessions to
> it when people login and logout, or at some other convinient time.
> Of course, this assumes your app isn't running in a distributed 
> environment.
> If it is, then it's impossible to get a session object from a different
> JVM.  (well, you could serialize it and transfer the data, but it won't
> be the same object and it won't be useful for much other than extracting
> some info)
> eric
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