Is this a configuration problem or a bug?
We use two dictionaries, default (spellcheckerFreq) and
solr.WordBreakSolrSpellChecker. When a query contains 2 misspellings,
one corrected by the default dictionary, and the other corrected by the
wordbreak dictionary ("strawberryn shortcake") , Solr crashes with error
below. It doesn't matter which dictionary is checked first.
java.lang.NullPointerException
at
org.apache.solr.handler.component.SpellCheckComponent.toNamedList(SpellCheckComponent.java:566)
at
org.apache.solr.handler.component.SpellCheckComponent.process(SpellCheckComponent.java:177)
at
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:204)
at
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:129)
at
org.apache.solr.core.RequestHandlers$LazyRequestHandlerWrapper.handleRequest(RequestHandlers.java:240)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:1555)
at
org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:442)
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:263)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:662)
Multiple errors corrected by the SAME dictionary (either wordbreak or
default) do not crash Solr. Here is excerpt from our solrconfig.xml:
<searchComponent name="spellcheck" class="solr.SpellCheckComponent">
<str name="queryAnalyzerFieldType">textSpell</str>
<lst name="spellchecker">
<str name="name">wordbreak</str>
<str name="classname">solr.WordBreakSolrSpellChecker</str>
<str name="field">spell</str>
<str name="combineWords">true</str>
<str name="breakWords">true</str>
<int name="maxChanges">1</int>
</lst>
<lst name="spellchecker">
<str name="name">default</str>
<str name="field">spell</str>
<str name="spellcheckIndexDir">spellcheckerFreq</str>
<str name="buildOnOptimize">true</str>
</lst>
</searchComponent>
<requestHandler name="/select" class="solr.SearchHandler">
<lst name="defaults">
.....
<str name="spellcheck.dictionary">wordbreak</str>
<str name="spellcheck.dictionary">default</str>
<str name="spellcheck.count">3</str>
<str name="spellcheck.collate">true</str>
<str name="spellcheck.onlyMorePopular">false</str>
</lst>
</requestHandler>
