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https://issues.apache.org/jira/browse/POOL-163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12857273#action_12857273
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Phil Steitz commented on POOL-163:
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Thanks for having a looking into the code, but I think your problem is likely
somewhere else. When an object borrowed from the pool fails validation it is
destroyed and not returned to the pool. The code is a little complicated, but
the object being examined in lines 1195-1228 of the 1.5.4 source is either
newly created or has been removed from the pool and assigned to the client
thread (i.e. it is no longer in the idle object pool, so will not be returned
to the current thread or any other client until it passes validation). The
actual removal from the pool happens in the allocate method, where the instance
is attached to the latch associated with the client thread.
Can you please provide a stack trace of the exception above?
> GenericKeyedObjectPool.borrowObject does not invalidate object if
> validateObject fails
> --------------------------------------------------------------------------------------
>
> Key: POOL-163
> URL: https://issues.apache.org/jira/browse/POOL-163
> Project: Commons Pool
> Issue Type: Bug
> Affects Versions: 1.5.4
> Environment: Windows, java version "1.6.0_06", Torque 3.3 (DBCP 1.4,
> jTDS 1.2.5)
> Reporter: Gabor Horvath
>
> GenericKeyedObjectPool.borrowObject does not invalidate object if
> validateObject fails (line ~1200). I guess invalidation would be needed for
> objects which are not newly created (newlyCreated flag in the code).
> Scenario:
> 1.) DB connection put into pool
> 2.) Attempt to reuse connection (borrowObject)
> 3.) Test on borrow (executing simple SQL query) fails: DB connection closed
> on jTDS level but connection remains in the pool
> 4.) Subsequent attempts to reuse the connection causes
> "java.sql.SQLException: Invalid state, the Connection object is closed"
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