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https://issues.apache.org/jira/browse/LUCENE-5684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14007012#comment-14007012
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ASF subversion and git services commented on LUCENE-5684:
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Commit 1597052 from [~mikemccand] in branch 'dev/branches/branch_4x'
[ https://svn.apache.org/r1597052 ]
LUCENE-5684: best effort detection of (illegal) reopen after index was blown
away
> 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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