Duplicate Emails from the JVMs

Hello Experts,
We support an application where the mails are triggered everyday to the group alias.It seems for the past one month, we are receing two mails triggered from both the JVms of this appliaction.
We tried using "for update" in the SQL query to stop one jvm from accessing the table and there by preventing the two mails . This seems to work fine in Testing environment but fails in production environment.
Can anyone please throw some lights on this issue.
This issue is similar to the thread
http://forums.sun.com/thread.jspa?threadID=5234670
Please help!!

Well, now you know "for update" isn't the solution for your problem as, apparently, it does not work in production environment. So, you should really thinking of alternate solutions.
Shalinisel wrote:
So , anyway to prevent this? Instead "Nowait" setting time wud work?Now, I wouldn't suggest this at all. Firstly, I personally don't like to create some race conditions among applications. If at all I have to create a race condition, then I definitely would not like to do a race condition with locking system. Because, I feel this is not a fool-proof solution. What if, somebody kicks off "send email process" other than the time you have locks of the table. And, also, locking mechanism should only be used sparingly.
Having said that, I suggest you have a new table with date column, at the least. Your "send email process" kick off, checks the date in this new table. If the date is not sysdate then it would send emails and update the date in the new table to sysdate (current date). On the other hand, if the "send email process" process finds that the date in the new table is sysdate (current date) then it would avoid sending emails. This new table will only have one row with the date when the email were sent.
I only think this kind of solution will benefit you in resolving this issue and having control on the application rather than application having control with the locking mechanism. Of course, the new table I suggested could be property file or a normal file and need not be a database table. But, I, generally, avoid creating a new property file since, again, anyone could easily go in and change it.

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<blockquote>
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<blockquote>
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My Outgoing server name is = smtp.att.yahoo.com
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