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https://issues.apache.org/jira/browse/LUCENE-883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12497014
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Daniel Naber commented on LUCENE-883:
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Yes, the exist() method checks whether the reader is null and re-opens it if
necessary, so reader = null is needed.
> make spell checker test case work again
> ---------------------------------------
>
> Key: LUCENE-883
> URL: https://issues.apache.org/jira/browse/LUCENE-883
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 2.1
> Reporter: Daniel Naber
> Attachments: lucene-spellchecker-2.diff
>
>
> See attached path which makes the spellchecker test case work again. The
> problem without the patch is that consecutive calls to indexDictionary() will
> create a spelling index with duplicate words. Does anybody see a problem with
> this patch? I see that the spellchecker code is now used in Solr, isn't it? I
> didn't have time to test this patch inside Solr.
> Also see http://issues.apache.org/jira/browse/LUCENE-632, but the null check
> is included in this patch so the NPE described there cannot happen anymore.
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