[SOLR-11858] NPE in DirectSpellChecker

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 7.1
• Component/s: spellchecker
• Assignee: Unassigned
• Reporter: Markus Jelsma
• Created: 16/Jan/18 11:39
• Updated: 10/Feb/22 10:45

Description

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.

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 

Config:

 <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>

Issue Links

• relates to: LUCENE-8147 DirectSpellChecker needs better parameter checks