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https://issues.apache.org/jira/browse/CONFIGURATION-527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13587111#comment-13587111
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Joerg Schaible commented on CONFIGURATION-527:
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It simply means that this change has to be postponed to version 2.0.
> clearPropertyDirect() in AbstractConfiguration should be abstract
> -----------------------------------------------------------------
>
> Key: CONFIGURATION-527
> URL: https://issues.apache.org/jira/browse/CONFIGURATION-527
> Project: Commons Configuration
> Issue Type: Improvement
> Components: Build
> Affects Versions: 1.9
> Reporter: Matthias Richter
> Priority: Minor
> Attachments: patch.diff
>
>
> The method clearPropertyDirect() in AbstractConfiguration has an empty
> implementation body. It is documented as "should be overwritten" but is not
> marked abstract.
> It should be abstract to prevent errors when subclassing
> AbstractConfiguration and using the clear() method where (indirectly)
> clearPropertyDirect() is being called.
> See addPropertyDirect() for comparison, which is abstract.
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