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https://issues.apache.org/jira/browse/LUCENE-2103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784842#action_12784842
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Uwe Schindler commented on LUCENE-2103:
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One addition: In my opinion, this class should be final. With the private ctor
it gets automatically final (you cannot extend without ctor), but should we
change this for now, too? This would be a (small) BW break.
> NoLockFactory should have a private constructor
> -----------------------------------------------
>
> Key: LUCENE-2103
> URL: https://issues.apache.org/jira/browse/LUCENE-2103
> Project: Lucene - Java
> Issue Type: Bug
> Components: Store
> Affects Versions: 3.0
> Reporter: Shai Erera
> Assignee: Uwe Schindler
> Priority: Trivial
> Fix For: 3.1
>
> Attachments: LUCENE-2103.patch, LUCENE-2103.patch
>
>
> NoLockFactory documents in its javadocs that one should use the static
> getNoLockFactory() method. However the class does not declare a private empty
> constructor, which breaks its Singleton purpose. We cannot add the empty
> private constructor because that'd break break-compat (even though I think
> it's very low chance someone actually instantiates the class), therefore
> we'll add a @deprecated warning to the class about this, and add the method
> in 4.0. I personally prefer to add an empty constructor w/ the @deprecated
> method, but am fine either way.
> Don't know if a patch is needed, as this is a trivial change.
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