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https://issues.apache.org/jira/browse/LUCENE-2280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12846985#action_12846985
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Michael McCandless commented on LUCENE-2280:
--------------------------------------------

Yes close() does commit() internally.

Are you saying you see the same exception on 3.0, using the IBM JRE?  Can you 
try with the Sun JRE?

> IndexWriter.optimize() throws NullPointerException
> --------------------------------------------------
>
>                 Key: LUCENE-2280
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2280
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: 2.3.2
>         Environment: Win 2003, lucene version 2.3.2, IBM JRE 1.6
>            Reporter: Ritesh Nigam
>         Attachments: lucene.jar, lucene.zip
>
>
> I am using lucene 2.3.2 search APIs for my application, i am indexing 45GB 
> database which creates approax 200MB index file, after finishing the indexing 
> and while running optimize() i can see NullPointerExcception thrown in my log 
> and index file is getting corrupted, log says
> ------------------------------------------------------------------------
> Caused by: 
> java.lang.NullPointerException
>       at 
> org.apache.lucene.store.BufferedIndexOutput.writeBytes(BufferedIndexOutput.java:49)
>       at org.apache.lucene.store.IndexOutput.writeBytes(IndexOutput.java:40)
>       at 
> org.apache.lucene.index.SegmentMerger.mergeNorms(SegmentMerger.java:566)
>       at org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:135)
>       at 
> org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:3273)
>       at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:2968)
>       at 
> org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:240)
> ------------------------------------------------------------------------
> and this is happening quite frequently, although I am not able to reproduce 
> it on demand, I saw an issue logged which is some what related to mine issue 
> (http://mail-archives.apache.org/mod_mbox/lucene-solr-user/200809.mbox/%3c6e4a40db-5efc-42da-a857-d59f4ec34...@mikemccandless.com%3e)
>  but the only difference here is I am not using Store.Compress for my fields, 
> i am using Store.NO instead. please note that I am using IBM JRE for my 
> application.
> Is this an issue with lucene?, if yes it is fixed in which version?

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