[SOLR-4320] NPE on spellcheck.count=0 for DirectSolrSpellChecker

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Cannot Reproduce
• Affects Version/s: 4.0
• Component/s: spellchecker
• Assignee: Unassigned
• Reporter: Jack Krupansky
• Created: 19/Jan/13 21:02
• Updated: 09/Jan/18 21:49
• Resolved: 09/Jan/18 21:49

Description

An NPE occurs if the spellcheck.count=0 parameter is specified when the spellcheck component is enabled with a DirectSolrSpellChecker spellchecker and a query term that has non-zero suggestions.

Repro:

1. Start with Solr 4.0 example.

2. Add these sample documents:

curl http://localhost:8983/solr/update?commit=true -H 'Content-type:application/csv' -d '
id,name
spel-1,aardvark abacus ball bill cat cello
spel-2,abate accord band bell cattle check
spel-3,adorn border clean clock'

3. Perform this spellcheck request:

curl "http://localhost:8983/solr/spell/?q=catl&spellcheck.count=0&indent=true"

4. See the NPE at org.apache.lucene.search.spell.DirectSpellChecker.suggestSimilar line 409.

Response:

<?xml version="1.0" encoding="UTF-8"?>
<response>

<lst name="responseHeader">
  <int name="status">500</int>
  <int name="QTime">45</int>
</lst>
<result name="response" numFound="0" start="0">
</result>
<lst name="error">
  <str name="trace">java.lang.NullPointerException
        at org.apache.lucene.search.spell.DirectSpellChecker.suggestSimilar(DirectSpellChecker.java:409)
        at org.apache.lucene.search.spell.DirectSpellChecker.suggestSimilar(DirectSpellChecker.java:355)
        at org.apache.solr.spelling.DirectSolrSpellChecker.getSuggestions(DirectSolrSpellChecker.java:189)
        at org.apache.solr.spelling.ConjunctionSolrSpellChecker.getSuggestions(ConjunctionSolrSpellChecker.java:120)
        at org.apache.solr.handler.component.SpellCheckComponent.process(SpellCheckComponent.java:172)
        at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:206)
        at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:129)
        at org.apache.solr.core.RequestHandlers$LazyRequestHandlerWrapper.handleRequest(RequestHandlers.java:240)
        at org.apache.solr.core.SolrCore.execute(SolrCore.java:1699)
        at org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:455)
        at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:276)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1337)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:484)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
        at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:233)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1065)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:413)
        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:192)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:999)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
        at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:250)
        at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:149)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:111)
        at org.eclipse.jetty.server.Server.handle(Server.java:351)
        at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:454)
        at org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:47)
        at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:890)
        at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:944)
        at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:634)
        at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:230)
        at org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:66)
        at org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:254)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:599)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:534)
        at java.lang.Thread.run(Unknown Source)
</str>
  <int name="code">500</int>
</lst>
</response>