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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2496) NPE if you open IW with CREATE on an index with no segments file
Date Sat, 30 Oct 2010 15:33:21 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12926593#action_12926593
] 

Michael McCandless commented on LUCENE-2496:
--------------------------------------------

OK I believe we don't need to backport this fix (the test case alone does not fail).

This bug was introduced with LUCENE-2386, which we don't plan to back port.

> NPE if you open IW with CREATE on an index with no segments file
> ----------------------------------------------------------------
>
>                 Key: LUCENE-2496
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2496
>             Project: Lucene - Java
>          Issue Type: Bug
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 3.1, 4.0
>
>         Attachments: LUCENE-2496.patch
>
>
> I have a simple test case that hits this NPE:
> {noformat}
>     [junit] java.lang.NullPointerException
>     [junit] 	at java.io.File.<init>(File.java:305)
>     [junit] 	at org.apache.lucene.store.NIOFSDirectory.openInput(NIOFSDirectory.java:67)
>     [junit] 	at org.apache.lucene.store.FSDirectory.openInput(FSDirectory.java:333)
>     [junit] 	at org.apache.lucene.index.SegmentInfos.read(SegmentInfos.java:213)
>     [junit] 	at org.apache.lucene.index.IndexFileDeleter.<init>(IndexFileDeleter.java:218)
>     [junit] 	at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:1113)
>     [junit] 	at org.apache.lucene.index.TestIndexWriter.testNoSegmentFile(TestIndexWriter.java:4975)
>     [junit] 	at org.apache.lucene.util.LuceneTestCase.runBare(LuceneTestCase.java:277)
> {noformat}
> It happens if you have an aborted index, ie, there are segment files in there (*.frq,
*.tis, etc.) but no segments_N file, and then you try to open an IW with CREATE on that index.

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