[jira] Commented: (DERBY-3675) ConcurrentModificationException on closing pooled connection

["Knut Anders Hatlen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DERBY-3675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12597449#action_12597449 ] 

Knut Anders Hatlen commented on DERBY-3675:
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Have you defined any connection event listeners on the pooled connection? And if you have, do any of the listeners add or remove listeners on the same pooled connection?

> ConcurrentModificationException on closing pooled connection
> ------------------------------------------------------------
>
>                 Key: DERBY-3675
>                 URL: https://issues.apache.org/jira/browse/DERBY-3675
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Client
>    Affects Versions: 10.4.1.3
>            Reporter: Trejkaz
>
> I'm seeing the following exception from calling close() on a connection returned from a CollectionPoolDataSource.
> java.util.ConcurrentModificationException
> 	at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
> 	at java.util.AbstractList$Itr.next(AbstractList.java:343)
> 	at org.apache.derby.client.ClientPooledConnection.recycleConnection(ClientPooledConnection.java:343)
> 	at org.apache.derby.client.am.LogicalConnection.close(LogicalConnection.java:83)
> The only particularly unique thing about the area of the code where we're doing this is that we're closing it immediately after opening it, as an initial check to make sure it can connect.

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