logging multiple users using NDC

["Digambar, Shaligram (Consultant)" <Sh...@GTECH.COM>]

Hello,
In our web application we have a JSP->Struts->EJB->Database dataFlow for
each user. I am using log4j for logging the data to a log file and
logFactor5 to display log from the log file. I am interested in sorting the
logs for each user based on the user ID. Mulitple users can log into the web
app at same time from different browsers. Currently the NDC is implemented
as below
->in login action servelet write NDC.push(userID)
->log debug messages in other JSPs and Actions and EJBs 
->in logoff action write NDC.pop(), NDC.remove()
 
This works well for one user e.g. it produces output like user123,"debug
message1"; user123 "infomessage1"   and so on.
The problem comes when another user say userABC logs in while user123 is
still logged in. The output log looks like user123 user456,"debug message1";
user123 user456,"infomessage1"   and so on.
 
I need a separate log record for each userID and I need to differentiate the
log records based on the userID. How can I accomplish that? Since the NDC
stack is global, it gets appeded for each user if the previous user is not
popped. Is there any other way to implement this?

Thanks,
Shaligram

Phone: (401)392-7948
Fax:(401)392-4974/4975



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