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https://issues.apache.org/jira/browse/LUCENE-5684?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless resolved LUCENE-5684.
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Resolution: Fixed
> Add best effort detection when index is removed & recreated before
> openIfChanged
> --------------------------------------------------------------------------------
>
> Key: LUCENE-5684
> URL: https://issues.apache.org/jira/browse/LUCENE-5684
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 4.9, 5.0
>
> Attachments: LUCENE-5684.patch, LUCENE-5684.patch
>
>
> I dug into the confusing NPE from the java-user email with subject "[lucene
> 4.6] NPE when calling IndexReader#openIfChanged".
> It happens because the app was opening an IndexReader, then rm -rf the entire
> index, build a new one, then calling reopen. This is invalid usage (the app
> should instead use IW.deleteAll, or open new IW with OpenMode.CREATE), but
> I'd like to add a minor best effort check...
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