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https://issues.apache.org/jira/browse/LUCENE-7303?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tommaso Teofili resolved LUCENE-7303.
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Resolution: Fixed
> Avoid NPE if classField doesn't exist in SNBC
> ---------------------------------------------
>
> Key: LUCENE-7303
> URL: https://issues.apache.org/jira/browse/LUCENE-7303
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/classification
> Reporter: Tommaso Teofili
> Assignee: Tommaso Teofili
> Priority: Minor
> Fix For: 6.1
>
>
> {{SimpleNaiveBayesClassifier}} uses _MultiFields.getTerms(leafReader,
> classFieldName)._ but doesn't check if the resulting _Terms_ is null or not.
> While that is unlikely to happen (it doesn't make much sense to use a
> classifier without specifying an existing class field), it may happen during
> testing and therefore better to avoid throwing a NPE.
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