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From Peter Schröder <>
Subject AW: AW: AW: postgres, idle in transaction
Date Fri, 27 Apr 2007 06:31:45 GMT
hi andrus,

i know that this issue sucks, but we are forced to solve it.

we did some further investigation of our live-environment and noticed that these idle connections
appear only while our application is plugged into our loadbalancer. first we thought that
this could be an concurrency or load issue, but regarding our logs, the load is close to zero...

i wondered if there is a way to get the current postgres-connection from cayenne. i dont know
how jdbc-connections are wrapped bye cayenne and i dont want to search through the code, even
though i might learn something ;-)

currently i am wondering about why the transaction is not properly closed and i think that
the postgres people said, that this issue had been fixed decades ago, so i guess thats right.
is there a way that the connection is not properly returned to the connection-pool after a
request and because of that the transaction will not put to commit?

kind regards

-----Urspr√ľngliche Nachricht-----
Von: Andrus Adamchik [] 
Gesendet: Donnerstag, 26. April 2007 13:47
Betreff: Re: AW: AW: postgres, idle in transaction

On Apr 26, 2007, at 1:14 PM, Oilid Adsi wrote:

> Or maybe by adding an explicit "COMMIT" after every SELECT- 
> Statement when the connection will be returned to the pool? Can  
> this implemented as an optional function to the Cayenne framework?

Per your comment the patch doing "rollback" didn't help, why do you  
think "commit" should help? Commit and rollback both terminate a  

But if you want to explore various scenarios, Cayenne allows you to  
plug a custom implementation of DataSource via the DataSourceFactory  
mechanism. So you don't need to patch Cayenne, but instead you can  
write a custom DataSource (based on Cayenne or DBCP library, or do it  
from scratch) to do any pre- or post- processing of connections  
checked in or out of the pool.

If you get to the cause of it, please share. Unfortunately I am out  
of ideas regarding this issue.


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