[jira] [Created] (LUCENE-6093) BlendedInfixSuggester throws NullPointerException if there were discarded trailing characters in the query

["Andrei Filimonov (JIRA)" <ji...@apache.org>]

Andrei Filimonov created LUCENE-6093:
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             Summary: BlendedInfixSuggester throws NullPointerException if there were discarded trailing characters in the query
                 Key: LUCENE-6093
                 URL: https://issues.apache.org/jira/browse/LUCENE-6093
             Project: Lucene - Core
          Issue Type: Bug
          Components: modules/spellchecker
    Affects Versions: 4.10.2
         Environment: Any environment
            Reporter: Andrei Filimonov
            Priority: Critical


BlendedInfixSuggester throws NullPointerException if there were discarded trailing characters (e.g. whitespace or special character) in the query.

The problem seems to be in the createCoefficient method that fails to check if prefixToken parameter is null. AnalyzingInfixSuggester sets prefixToken to null in the described case and passes it to BlendedInfixSuggester. On the side not even if BlendedInfixSuggester is changed to handle this creates a problem to calculate the weights as prefixToken is null and cannot be used. I would be better to have AnalyzingInfixSuggester to always set prefixToken to lastToken.



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