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https://issues.apache.org/jira/browse/LUCENE-6468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14537755#comment-14537755
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ASF subversion and git services commented on LUCENE-6468:
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Commit 1678702 from [~cm] in branch 'dev/branches/branch_5x'
[ https://svn.apache.org/r1678702 ]
Merged r1678685 from trunk (LUCENE-6468)
> 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
> Assignee: Christian Moen
> 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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