Duplicate Session Detected Error [BlazeDS]

I have two saperate EAR applicaion deployed under two saperate Cluster of Weblogic and both application has nothing to do with each other , they just share the same J2EE server.
I am only using Remoting which invokes sever side java code and returns some data in response..
I could not understang what mistake I am doing which is causing this error. I appriciate any help on this.
- Dharmendra

Hi. You're going to have problems using a traditional HTTP load test tool (I'm assuming grinder falls into this category) with BlazeDS. The issue is that these tools don't understand the BlazeDS messaging protocol.
With BlazeDS you can have more than one application sharing the same HTTP Session. Each application would run its own browser window but depending on which browser (IE, Firefox, etc.) and how that browser was started, the two windows might share the same session. BlazeDS needs to be able to tell these applications apart. This is done using a unique application id called the FlexClient id or DSID that is sent with every request. The load test tool you are using needs to be able to use a unique DSID for every virtual user.
There is also other information in the message that the load test tool needs to be aware of. For example every message uses a unique message id. If the server receives messages with duplicate ids it may drop/ignore the duplicate messages.
There are a couple load test tools out there that support BlazeDS. I'd suggest taking a look at one of these.
One commercial tool is called NeoLoad from a company called Neotys:
http://www.neotys.com/
A free tool is the Data Services Stress Testing Framework. This tool runs on LiveCycle Data Services ES (LCDS) but can used to put load on applications running on BlazeDS servers.
http://labs.adobe.com/wiki/index.php/Flex_Stress_Testing_Framework
Hope that helps.
-Alex

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Revision: 21394
Revision: 21394
Author:   [email protected]
Date:     2011-06-16 12:34:13 -0700 (Thu, 16 Jun 2011)
Log Message:
bug fix for watson 2887837 Not getting duplicate session detected error when same flex client id is used from two different HTTP sessions in CRX.
get the sessions id before we invalidate the duplicate session.
Checkintests pass
Modified Paths:
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For our profect I think this issue was caused as follows:
Believing that remoting was full asynchronous we fired a 2 or 3 remote calls to the server at the same time ( within the same function ) - usually when the users goes to a new section of the app.
This seemed to trigger the duplicate http session error since according to http://blogs.adobe.com/lin/2011/05/duplication-session-error.html two remote calls arriving before a session is created will cause 2 sessions to be created.
Our current solution ( too early to say it works ) is to daisy chain the multiple calls together .
Also there seemed to be an issue where mobile apps that never quit ( thanks Apple! ) caused the error when activated after a few hours.
I guess the session expires on the server and the error above occurs on activation.
So the mobile apps now ping the server with a remote call when activated after sleeping for more than one hour.
All duplicate http errors are silently caught and reported.
Fingers crossed we won't get any more!

[svn:fx-trunk] 21141: Bug: 2780176 - Logging and logging out multiple times in LCDS can cause duplicate session detected errors .

Revision: 21141
Revision: 21141
Author:   [email protected]
Date:     2011-04-26 06:40:39 -0700 (Tue, 26 Apr 2011)
Log Message:
Bug: 2780176 - Logging and logging out multiple times in LCDS can cause duplicate session detected errors.
QA: Yes
Doc: No
Checkintests: Pass
Details: When a logout was followed by an immediate login, sometimes the server would throw duplicate session detected errors. This was because when logout happened, a fire-and-forget disconnect message was sent to the server that established a new session, and if the subsequent login happened before disconnect ACK returned from the server, that would establish another session and hence the error. The fix is to insert a slight delay between disconnect and ResultEvent dispatching. This way, disconnect has a chance to return before a login is performed.
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Have read most of the docs about this error -all to do with LCDS
Notes:
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For our profect I think this issue was caused as follows:
Believing that remoting was full asynchronous we fired a 2 or 3 remote calls to the server at the same time ( within the same function ) - usually when the users goes to a new section of the app.
This seemed to trigger the duplicate http session error since according to http://blogs.adobe.com/lin/2011/05/duplication-session-error.html two remote calls arriving before a session is created will cause 2 sessions to be created.
Our current solution ( too early to say it works ) is to daisy chain the multiple calls together .
Also there seemed to be an issue where mobile apps that never quit ( thanks Apple! ) caused the error when activated after a few hours.
I guess the session expires on the server and the error above occurs on activation.
So the mobile apps now ping the server with a remote call when activated after sleeping for more than one hour.
All duplicate http errors are silently caught and reported.
Fingers crossed we won't get any more!

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Duplicate Session Detected Error [BlazeDS]

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