Question

I tried using Solr’s Suggester component but it gives exception Unknown Search Component: spellcheck. I am using solr version 3.6. I made changes in solrconfig.xml so it looks like this

<searchComponent class="solr.SpellCheckComponent" name="suggester">
 <lst name="spellchecker">
      <str name="name">suggester</str>
      <str name="field">name</str>
      <str name="classname">org.apache.solr.spelling.suggest.Suggester</str>
      <str name="lookupImpl">org.apache.solr.spelling.suggest.tst.TSTLookup</str>
      <float name="threshold">0.005</float>
      <str name="buildOnCommit">true</str>
      <str name="spellcheckIndexDir">spellchecker</str>
 </lst> 
</searchComponent>

<requestHandler class="org.apache.solr.handler.component.SearchHandler" name="/suggester">
  <lst name="defaults">
  <str name="spellcheck">true</str>
  <str name="spellcheck.dictionary">suggester</str>
  <str name="spellcheck.count">10</str>
  </lst>
  <arr name="components">
  <str>suggester</str>
  </arr>
</requestHandler>

Now i saved it and started solr but it gives a 500 error. There is a long stack trace which goes like this

HTTP Status 500 - Severe errors in solr configuration. Check your log files for more detailed information on what may be wrong. If you want solr to continue after configuration errors, change: <abortOnConfigurationError>false</abortOnConfigurationError> in solr.xml ------------------------------------------------------------- org.apache.solr.common.SolrException: No cores were created, please check the logs for errors at org.apache.solr.core.CoreContainer$Initializer.initialize(CoreContainer.java:172) at org.apache.solr.servlet.SolrDispatchFilter.init(SolrDispatchFilter.java:96) at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:295) at 

—lot of lines—

and some more

Caused by: org.apache.solr.common.SolrException: Unknown Search Component: spellcheck at org.apache.solr.core.SolrCore.getSearchComponent(SolrCore.java:893) at org.apache.solr.handler.component.SearchHandler.inform(SearchHandler.java:118) at org.apache.solr.core.SolrResourceLoader.inform(SolrResourceLoader.java:527) at org.apache.solr.core.SolrCore.<init>(SolrCore.java:594) ... 32 more

According to the stack trace Solr is not able to find the spellcheck component but according to the Solr wiki this component comes with Solr version > 1.4.

Answer 1

You seem to have named your search component suggester, and your requestHandler refers to it correctly, so that’s probably not where the issue is. Can you check in the rest of your solrconfig.xml whether some other requestHandler refers to a component named spellcheck in its last-components section or elsewhere? That would throw an error since it can no longer find a component with that name (it’s been renamed to suggester).

The thing with solrconfig is that it comes with a lot of preconfigured search handlers, and if you change the default name of one item it could cause issues with handlers that refer to it.