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https://issues.apache.org/jira/browse/DBCP-331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12857642#action_12857642
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Phil Steitz commented on DBCP-331:
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Thanks for digging into this further. The top stack trace is troubling and may
point to a dbcp bug. I don't see anything wrong with the pool part of this, so
I moved the issue to dbcp. The torque client is calling getConnection on
SharedPoolDataSource with no username or password, which means a <null, null>
key (need to look into the torque code to verify that this is normal and what
it means). In dbcp 1.4, as part of the changes to support password changes
(DBCP-8), equality among UserPassKeys was changed to identify keys with the
same username. I don't yet have an explanation for the trace. I will dig
into the torque code this weekend and see if I can figure our what is going on.
> GenericKeyedObjectPool.borrowObject does not invalidate object if
> validateObject fails
> --------------------------------------------------------------------------------------
>
> Key: DBCP-331
> URL: https://issues.apache.org/jira/browse/DBCP-331
> Project: Commons Dbcp
> Issue Type: Bug
> Affects Versions: 1.3, 1.4
> 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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