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https://issues.apache.org/jira/browse/LUCENE-3710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13189746#comment-13189746
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Michael McCandless commented on LUCENE-3710:
--------------------------------------------
Do you have a full exception...? Is this because you called
IndexWriter.commit, and passed a Map<String,String> that had a null value?
Seems like we should add javadocs that you cannot store null values in the
commit data?
> NullPointerException in DataOutput
> ----------------------------------
>
> Key: LUCENE-3710
> URL: https://issues.apache.org/jira/browse/LUCENE-3710
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/store
> Environment: Google App Engine
> Reporter: André Luiz Nascimento Silva
> Priority: Minor
>
> The class org.apache.lucene.store.DataOutput throw a NullPointerException in
> line 189 if the value from Map.Entry is null.
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