There is an article on javaworld.com titled J2EE Clustering (Part 1 and 2).
Here is a para from part 1 that might be helpful
"Providing J2EE services on a single machine is trivial compared with
providing the same services across a cluster. Due to the complications of
clustering, every application server implements clustered components in
unique ways. You should understand how vendors implement clustering and
failover of entity beans, stateless session beans, stateful session beans,
and JMS. Many vendors claim to support clustered components but their
definitions of what that means usually involve components running in a
cluster. For example, BEA WebLogic Server 5.1 supported clustered stateful
session beans but if the server that the bean instance was on were to fail,
all of the state would be lost. The client would then have to re-create and
repopulate the stateful session bean, making it useless in a cluster. It
wasn't until BEA WebLogic 6.0 that stateful session beans employed in-memory
replication for failover and clustering. "
Cheers
Jeetendra Dassani
Lead Systems Engineer
Tata Infotech Limited
Tel: 8291261 X 2787
Email: [EMAIL PROTECTED]
[EMAIL PROTECTED]
-----Original Message-----
From: A mailing list for Enterprise JavaBeans development
[mailto:[EMAIL PROTECTED]]On Behalf Of Daniel Carlberg
Sent: Tuesday, September 25, 2001 10:00 PM
To: [EMAIL PROTECTED]
Subject: Re: StatefulSession & Clustering
The EJB spec does not cover how application server vendors should implement
clustering. Stateful session bean clustering works in Weblogic (atleast from
version 6), if you need more information check the documentation 'Using
Weblogic Server Clusters'
(http://edocs.bea.com/wls/docs61/cluster/index.html).
/ Daniel
>From: "Riccardo F." <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: [EMAIL PROTECTED]
>Subject: StatefulSession & Clustering
>Date: Fri, 21 Sep 2001 20:06:46 +0200
>
>Hi,
>is true that with stateful ejbs is not possible achieve clustering with
>WebLogic (state replication problems)? If it is true, is a WL limitation
>or is a EJB Specifications (I did not read nothing on EJB Spec.)
>limitation?
>Where can I get some documentation about this eventual problem?
>
>Thanks in advance.
>
>Riccardo.
>
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