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https://issues.apache.org/jira/browse/DERBY-3308?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kristian Waagan updated DERBY-3308:
-----------------------------------

    Attachment: derby-3308-1a-eventlisteners_synchronization.diff

'derby-3308-1a-eventlisteners_synchronization.diff' synchronizes all methods 
accessing the list (a java.util.Vector) of statement event listeners.

I ran derbyall/suites.All without errors. Patch ready for review.

> Broken synchronization for event handling in ClientPooledConnection40
> ---------------------------------------------------------------------
>
>                 Key: DERBY-3308
>                 URL: https://issues.apache.org/jira/browse/DERBY-3308
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC, Network Client
>    Affects Versions: 10.2.2.0, 10.3.2.1, 10.4.0.0
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>            Priority: Minor
>             Fix For: 10.4.0.0
>
>         Attachments: derby-3308-1a-eventlisteners_synchronization.diff
>
>
> Access to the the list of event listeners is not synchronized properly.
> Taken the rather infrequent use of the relevant methods and the small 
> critical sections, I mean it is sufficient to add synchronization to all the 
> methods that access it at the method level. The same approach is taken in 
> ClientPooledConnection (although not followed through consistently, some of 
> the methods are unsynchronized).

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