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https://issues.apache.org/jira/browse/DBCP-329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851355#action_12851355
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James Carman commented on DBCP-329:
-----------------------------------
Wouldn't a lot of this be solved by using a validation query (and
test-on-borrow)?
> SQLException: Already closed.
> -----------------------------
>
> Key: DBCP-329
> URL: https://issues.apache.org/jira/browse/DBCP-329
> Project: Commons Dbcp
> Issue Type: Bug
> Affects Versions: 1.4
> Environment: MySQL
> Reporter: Hontvari Jozsef
>
> After upgrading to 1.4 I see such exceptions logged:
> java.sql.SQLException: Already closed.
> at
> org.apache.commons.dbcp.PoolableConnection.close(PoolableConnection.java:114)
> at
> org.apache.commons.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.close(PoolingDataSource.java:191)
> ...
> This should never happen. According to the Connection.close() javadoc:
> "Calling the method close on a Connection object that is already closed is a
> no-op."
>
> Moreover, I am pretty sure that our code does not close the connection twice.
> But because the close() is called in a finally block, it is possible that
> this exception hides another exception. Unfortunately I cannot reproduce it,
> even though it occurs regularly.
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