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From "Michael McCandless (JIRA)" <>
Subject [jira] Commented: (LUCENE-2280) IndexWriter.optimize() throws NullPointerException
Date Mon, 08 Mar 2010 16:07:27 GMT


Michael McCandless commented on LUCENE-2280:

bq. I checked the documentation of IndexWriter in 2.3.2, API commit() is not available with
this version (I think it is introduced in 2.4), I am not explicitely setting autoCommit, so
it should take default value which I believe is "true".

Ahh right sorry.  Hard to remember that far back!

bq. One more thing I am catching any exception hitting during indexing or optimizing, and
then in finally block i am closing the IndexWriter by calling close(), method which sould
take care of commit internally? Please suggest me if there is any equivalent method which
i can use in place of commit()

That's right, though, Lucene doesn't call "fsync" (to the OS) in
2.3.x... so if the machine/OS crashes it could corrupt your index.  So
it's not quite doing the same thing as commit() does in newer Lucene
releases (ensure durability), but it does save everything to the

bq. I have not upgraded to the newer version of lucene, but probably i will try 3.0.0 version
of lucene in future.


> IndexWriter.optimize() throws NullPointerException
> --------------------------------------------------
>                 Key: LUCENE-2280
>                 URL:
>             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
> 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
> ------------------------------------------------------------------------
> Caused by: 
> java.lang.NullPointerException
> 	at
> 	at
> 	at org.apache.lucene.index.SegmentMerger.mergeNorms(
> 	at org.apache.lucene.index.SegmentMerger.merge(
> 	at org.apache.lucene.index.IndexWriter.mergeMiddle(
> 	at org.apache.lucene.index.IndexWriter.merge(
> 	at org.apache.lucene.index.ConcurrentMergeScheduler$
> ------------------------------------------------------------------------
> 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 (
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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