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From Swaminathan Gurumoorthy <>
Subject Re: DBCP Pool - Releasing connections
Date Tue, 02 Dec 2003 17:40:47 GMT
Can I use 'testOnBorrow' to validate the connection. The documentaion says it is 'true' by
default. Will this parameter work only with 'validationQuery '?
I wish DBCP has a 'releaseStale' parameter similar to the 'removeAbandoned' . This may eliminate
the overhead on 'testOnBorrow'.

Larry Young <> wrote:

When I detect a problem like this in my code, I call "close()" on 
the datasource, which in my case is a BasicDataSource. This blows away all 
currently held connections in the pool. If you're in a multi-threaded 
world like in a web app, you might want to be a bit careful of how you do 
this to avoid any race conditions, although if one connection is dead, more 
than likely they all will be.

Another thing that I do is I have an agreement with our AS400 DB 
folks that when they are going down, they send me a message so I can handle 
this type of behavior a bit more gracefully.

--- regards ---

At 10:07 AM 12/2/03, you wrote:
>I need some help on how to refresh DB connection using DBCP. We have a web 
>application built on Struts running on Tomcat 4.1.18 and talking to a 
>AS400 database. We use commons DBCP for datasoures.
>Our database goes down every morning at 5 AM for maintenanace because of 
>which Tomcat/DBCP loses its connection. When I come in the morning and 
>try to access the app ,I usually get a connection exception because 
>datasource.getConnection() craps out. I usually restart Tomcat to refresh 
>all connections ( the project is still under development and hence I get 
>away with it).
>Is there a parameter setting by which I can ask DBCP to see if the 
>connection is stale (like in the case of a DB shutdown) and if so release 
>all connections or even better try 'n' times to refresh before releasing them?
>Intuitively I thought the 'minIdle=0' wud do the trick but it is set to 
>zero by default anyway. Will setting removeAbandoned to true help my cause?
>Do you Yahoo!?
>Free Pop-Up Blocker - Get it now

Larry Young
The Dalmatian Group 

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