[opencms-dev] Duplicate Entry Exception While CmsObject.LoginUser() - Please Help urgent

[Govind R]

Hello All
Please help...

Can i change the code of opencms.
Please provide some pointers.

Regards
Govind


2009/5/20 Nacho Fernández Orellana <nacho.fernandez.orellana at gmail.com>

> Dear Govind and list,
>
> Funny that just yesterday we faced the same issue (stressing with JMeter an
> OpenCms installation that included login into the workplace). The problem
> reason is that the method that writes user info
> (org.opencms.db.generic.CmsUserDriver.internalWriteUserInfos) first deletes
> the user info and then loops through the different user info nodes and
> writes them one by one. All this block is not synchronized, so concurrent
> accesses to inserting (after having both executions deleted) with the same
> pair "user_id" and "data_key" will produce a database key violation
> exception.
>
> This issue is real but by concept it should also be unimportant, because
> for this issue to happen you have to have THE SAME USER login twice at the
> same time, and the same time means just in the code after deleting user info
> and while inserting. This is almost impossible for actual users to reproduce
> even if several logs in with the same username.
>
> I guess it's up to Alkacon guys to evaluate the need of synchronizing that
> block of code or not. I hope this helped. Greetings,
>
> Nacho Fernandez.
>
>
> _______________________________________________
> This mail is sent to you from the opencms-dev mailing list
> To change your list options, or to unsubscribe from the list, please visit
> http://lists.opencms.org/mailman/listinfo/opencms-dev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://webmail.opencms.org/pipermail/opencms-dev/attachments/20090521/6c9a87ee/attachment.htm>