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Date: Mon, 5 Apr 2010 19:32:28 +0000 (UTC)
From: "Michael McCandless (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Resolved: (LUCENE-2365) Finding Newest Segment In Empty
 Index
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     [ https://issues.apache.org/jira/browse/LUCENE-2365?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael McCandless resolved LUCENE-2365.
----------------------------------------

       Resolution: Fixed
    Fix Version/s:     (was: 3.0.1)
                   3.1

Thanks Karthick!

> Finding Newest Segment In Empty Index
> -------------------------------------
>
>                 Key: LUCENE-2365
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2365
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: 3.0.1
>            Reporter: Karthick Sankarachary
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 3.1
>
>         Attachments: LUCENE-2365.patch
>
>
> While extending the index writer, I discovered that its newestSegment method does not check to see if there are any segments before accessing the segment infos vector. Specifically, if you call the IndexWriter#newestSegment method on a brand-new index which is essentially empty, then it throws an java.lang.ArrayIndexOutOfBoundsException exception.
> The proposed fix is to return null if no segments exist, as shown below:
> --- lucene/src/java/org/apache/lucene/index/IndexWriter.java	(revision 930788)
> +++ lucene/src/java/org/apache/lucene/index/IndexWriter.java	(working copy)
> @@ -4587,7 +4587,7 @@
>  
>    // utility routines for tests
>    SegmentInfo newestSegment() {
> -    return segmentInfos.info(segmentInfos.size()-1);
> +    return segmentInfos.size() > 0 ? segmentInfos.info(segmentInfos.size()-1) : null;
>    }

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