solrj “org.apache.solr.common.util.SimpleOrderedMap cannot be cast to java.util.Map” exception when using “/suggest” handler

问题

I get the class cast exception when trying to run the solrj program using /suggest handler. I am able to get the suggestion response from Solr Admin UI, but when the same is being tried from solrj client the above exception arises.

The solr-config.xml entries are as follows :

 <searchComponent name="suggest" class="solr.SuggestComponent">
    <lst name="suggester">
            <str name="name">mySuggester</str>
            <str name="lookupImpl">FuzzyLookupFactory</str>
            <str name="dictionaryImpl">DocumentDictionaryFactory</str>
            <str name="field">suggestfield</str>
            <str name="suggestAnalyzerFieldType">text_general</str>

    </lst>
  </searchComponent>

  <requestHandler name="/suggest" class="solr.SearchHandler" startup="lazy">
    <lst name="defaults">
            <str name="suggest">true</str>
            <str name="suggest.count">10</str>
        <str name="suggest.dictionary">mySuggester</str>
    </lst>
    <arr name="components">
            <str>suggest</str>
    </arr>
  </requestHandler>

The schema.xml contains the field

<field name="suggestfield" type="text_general" indexed="true" stored="true"/>

which is a copyField of multiple fields.

The java code is as follows :

 String url = "http://localhost:8983/solr/testwidget"; 
    HttpSolrClient client = new HttpSolrClient.Builder(url).build();
    client.setParser(new XMLResponseParser());

    SolrQuery query = new SolrQuery();
    query.setRequestHandler("/suggest");
    query.setParam("suggest.build", true);
    query.setParam("suggest", true);
    query.setParam("suggest.dictionary", "mySuggester");
    query.setParam("suggest.q", "acc");

    QueryResponse response = client.query(query);
  System.out.println(response.getSuggesterResponse().getSuggestedTerms());

The exception is as follows :

 Exception in thread "main" java.lang.ClassCastException: org.apache.solr.common.util.SimpleOrderedMap cannot be cast to java.util.Map
    at org.apache.solr.client.solrj.response.QueryResponse.setResponse(QueryResponse.java:161)
    at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:194)
    at org.apache.solr.client.solrj.SolrClient.query(SolrClient.java:942)
    at org.apache.solr.client.solrj.SolrClient.query(SolrClient.java:957)
    at com.intellectdesign.canvas.solr.SolrjTest.main(SolrjTest.java:41)

回答1:

I'm not sure why it set XMLResponseParser and then request wt=json. I think https://github.com/apache/lucene-solr/blob/master/solr/solrj/src/test/org/apache/solr/client/solrj/response/TestSuggesterResponse.java may be used as a sample for beginning.

回答2:

Does it make any sense to use a multivalued field for a suggester? Which one does it suggest? The copyField directive will put multiple chunks of text in a single field.

What result do you want? This design doesn't make sense to me.

来源：https://stackoverflow.com/questions/55115760/solrj-org-apache-solr-common-util-simpleorderedmap-cannot-be-cast-to-java-util

标签

java

solr

solrj