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