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https://issues.apache.org/jira/browse/DBCP-432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14299968#comment-14299968
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Adrian Crum commented on DBCP-432:
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Why not use AtomicReference?
> BasicDataSource createDataSource can return partially initialized DataSource
> ----------------------------------------------------------------------------
>
> Key: DBCP-432
> URL: https://issues.apache.org/jira/browse/DBCP-432
> Project: Commons Dbcp
> Issue Type: Bug
> Affects Versions: 2.0
> Reporter: Phil Steitz
> Attachments: DBCP-432.patch
>
>
> The BasicDataSource instance variable, dataSource, is DCL-controlled in
> createDataSource; but within the sync block it is set directly and then
> subsequently initialized. Threads that request connections, or access
> createDataSource directly while initialization is in progress will get
> partially initialized dataSources. In particular, logWriters may be null and
> initial pool capacity may not be provisioned (if initialSize > 0).
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