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https://issues.apache.org/jira/browse/DERBY-4928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12969269#action_12969269
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Knut Anders Hatlen commented on DERBY-4928:
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Looks like a good cleanup to me. +1
(One small typo in a comment in BaseJDBCTestCase: "Run throgh" -> "Run through")
> Deadlock-prone synchronization in BasicDependencyManager
> --------------------------------------------------------
>
> Key: DERBY-4928
> URL: https://issues.apache.org/jira/browse/DERBY-4928
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.8.0.0
> Reporter: Kristian Waagan
> Assignee: Kristian Waagan
> Attachments: derby-4928-1a-depman_sync_and_cleanup.diff
>
>
> The synchronization in BasicDependencyManager is prone to deadlock, because
> database locks are obtained while holding the monitor on "this".
> Problem observed when testing the automatic index statistics update prototype.
> There are comments in the file suggesting that in-memory dependencies should
> be accessed while holding the Java monitor, but the monitor should not be
> held when accessing stored dependencies. The implementation is breaking this
> rule/suggestion.
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