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https://issues.apache.org/jira/browse/SOLR-11858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16347821#comment-16347821
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Robert Muir commented on SOLR-11858:
------------------------------------
My best guess is the high level bug is here:
[https://github.com/apache/lucene-solr/blob/releases/lucene-solr/7.1.0/solr/core/src/java/org/apache/solr/spelling/DirectSolrSpellChecker.java#L185]
Basically from what I see from the stacktrace, it can happen easily if
something asks for zero or negative suggestions... and unfortunately you'll get
a crazy exception instead of a simple IllegalArgumentException. We should add
some parameter checks to lucene so that you get a good exception instead.
As far as the solr code calling it, thats a separate issue... i have no idea,
because i don't know much about this SpellingOptions, but one of the values in
question defaults to zero...
> NPE in DirectSpellChecker
> -------------------------
>
> Key: SOLR-11858
> URL: https://issues.apache.org/jira/browse/SOLR-11858
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: spellchecker
> Affects Versions: 7.1
> Reporter: Markus Jelsma
> Priority: Major
> Fix For: master (8.0), 7.3
>
>
> We just came across the following NPE. It seems this NPE only appears when
> the query is incorrectly spelled but response has more than 0 results. We
> have not observed this on other 7.1.0 deployments.
> {code}
> 2018-01-16 09:15:00.009 ERROR (qtp329611835-19) [c] o.a.s.h.RequestHand
> lerBase java.lang.NullPointerException
> at
> org.apache.lucene.search.spell.DirectSpellChecker.suggestSimilar(DirectSpellChecker.java:421)
> at
> org.apache.lucene.search.spell.DirectSpellChecker.suggestSimilar(DirectSpellChecker.java:353)
> at
> org.apache.solr.spelling.DirectSolrSpellChecker.getSuggestions(DirectSolrSpellChecker.java:186)
> at
> org.apache.solr.handler.component.SpellCheckComponent.process(SpellCheckComponent.java:195)
> at
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:295)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:177)
> at org.apache.solr.core.SolrCore.execute(SolrCore.java:2484)
> at
> {code}
> Config:
> {code}
> <searchComponent name="spellcheck" class="solr.SpellCheckComponent">
> <str name="queryAnalyzerFieldType">text_general</str>
> <lst name="spellchecker">
> <str name="name">default</str>
> <str name="field">spellcheck</str>
> <str name="classname">solr.DirectSolrSpellChecker</str>
> <str name="distanceMeasure">internal</str>
> <float name="accuracy">0.5</float>
> <int name="maxEdits">2</int>
> <int name="minPrefix">1</int>
> <int name="maxInspections">5</int>
> <int name="minQueryLength">4</int>
> <float name="maxQueryFrequency">0.01</float>
> </lst>
> {code}
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