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https://issues.apache.org/jira/browse/LUCENE-6468?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jun Ohtani updated LUCENE-6468:
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Attachment: LUCENE-6468.patch
I created the patch for this issue.
Add open(Reader reader) static method to UserDictionary.
And add test empty user dict.
Please review this patch.
> Empty kuromoji user dictionary -> NPE
> -------------------------------------
>
> Key: LUCENE-6468
> URL: https://issues.apache.org/jira/browse/LUCENE-6468
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Attachments: LUCENE-6468.patch
>
>
> Kuromoji user dictionary takes Reader and allows for comments and other lines
> to be ignored. But if its "empty" in the sense of no actual entries, the
> returned FST will be null, and it will throw a confusing NPE.
> JapaneseTokenizer and JapaneseAnalyzer apis already treat null UserDictionary
> as having none at all, so I think the best fix is to fix the UserDictionary
> api from UserDictionary(Reader) to UserDictionary.open(Reader) or similar,
> and return null if the FST is empty.
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