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From "Phil Steitz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DBCP-415) Pooled PreparedStatements may be closed when accessed
Date Mon, 14 Apr 2014 03:51:15 GMT

    [ https://issues.apache.org/jira/browse/DBCP-415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13968045#comment-13968045
] 

Phil Steitz commented on DBCP-415:
----------------------------------

@Sebb - I don't think that is actually a problem.  Only one thread at a time should have access
to a given PoolingConnection at a time (else we have a [pool] problem, which I first thought
this might be, but now think it is not).  As long as clients adhere to the pool contract (which
I am pretty sure DBCP does and I know the test code does from DBCP standpoint - no retained
references / use after connection close), there will be no concurrent access to a single PoolingConnection.
 In addition to that protection, the PoolalePreparedStatements are accessed only through their
PooledObject wrappers in the GKOP owned by the PoolingConnection that they belong to.  I could
be wrong, but I am pretty sure that the problem here is the "back door" access to the DelegatingStatement
via the finalizer.  I am -0 to the volatile changes, OK if they can be shown to have zero
performance impact.

> Pooled PreparedStatements may be closed when accessed
> -----------------------------------------------------
>
>                 Key: DBCP-415
>                 URL: https://issues.apache.org/jira/browse/DBCP-415
>             Project: Commons Dbcp
>          Issue Type: Bug
>    Affects Versions: 2.0
>            Reporter: Phil Steitz
>
> Under high concurrency, connections using pooled PreparedStatements may encounter SQLExceptions
with messages of the form "org.apache.commons.dbcp2.PoolablePreparedStatement with address:
'quoted SQL' is closed."



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