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https://issues.apache.org/jira/browse/DERBY-5830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13400472#comment-13400472
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Dag H. Wanvik commented on DERBY-5830:
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Looks like a good improvement in its own right. +1
> Make DoubleProperties.propertyNames() thread-safe
> -------------------------------------------------
>
> Key: DERBY-5830
> URL: https://issues.apache.org/jira/browse/DERBY-5830
> Project: Derby
> Issue Type: Bug
> Components: Services
> Affects Versions: 10.9.1.0
> Reporter: Knut Anders Hatlen
> Assignee: Knut Anders Hatlen
> Attachments: keys-only-v2.diff
>
>
> As discussed in DERBY-4269, DoubleProperties.propertyNames() may throw a
> NullPointerException if properties are removed by another thread while the
> method is executing. Since DoubleProperties is a sub-class of, and used as a
> drop-in replacement for, java.util.Properties, it should be thread-safe just
> like the propertyNames() method in the parent class.
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