Querying Solr via Solrj: Basics

java, lucene, solr, solrj

Solution

Here is how I got Solrj (Solr 3.6) working on my Windows7 box with eclipse:

import java.net.MalformedURLException;

import org.apache.solr.client.solrj.SolrServer;
import org.apache.solr.client.solrj.SolrServerException;
import org.apache.solr.client.solrj.impl.HttpSolrServer;
import org.apache.solr.client.solrj.response.QueryResponse;
import org.apache.solr.common.params.ModifiableSolrParams;

public class SolrQuery {
  public static void main(String[] args) throws MalformedURLException, SolrServerException {
    SolrServer server = new HttpSolrServer("http://localhost:8080/solr");
        ModifiableSolrParams params = new ModifiableSolrParams();
        params.set("q", "1");

            QueryResponse response = server.query(params);

            System.out.println("response = " + response);

  }
}

I had to download additional jars (outside Solr of 3.6) for this to work: httpcomponents-client-4.2-beta1

In total, I needed 4 jars to get this working :

- apache-solr-solrj-3.6.0.jar

- httpclient-4.2-beta1.jar

- httpcore-4.2-beta1.jar

- httpmime-4.2-beta1.jar

Im not sure if my solution is considered a best practice in terms of boilercode, but it solves the issue of getting up on solrj w/ eclipse.

Problem

I am trying to query solr via solrj in Eclipse. I have tried the latest solrj wiki example: ``` import org.apache.solr.client.solrj.SolrServer; import org.apache.solr.client.solrj.SolrServerException; import org.apache.solr.client.solrj.impl.CommonsHttpSolrServer; import org.apache.solr.client.solrj.response.QueryResponse; import org.apache.solr.common.params.ModifiableSolrParams; import java.net.MalformedURLException; public class SolrQuery2 { public static void main(String[] args) throws MalformedURLException, SolrServerException { SolrServer solr = new CommonsHttpSolrServer("http://localhost:8080/solr"); // http://localhost:8080/solr/select/?q=outside ModifiableSolrParams params = new ModifiableSolrParams(); params.set("qt", "/select"); params.set("q", "outside"); QueryResponse response = solr.query(params); System.out.println("response = " + response); } } ``` However, I cant get past this error no matter what I do: ``` Exception in thread "main" java.lang.NoSuchMethodError: org.slf4j.spi.LocationAwareLogger.log(Lorg/slf4j/Marker;Ljava/lang/String;ILjava/lang/String;[Ljava/lang/Object;Ljava/lang/Throwable;)V ``` Next, I tried the cookbook example: ``` import java.util.Iterator; import org.apache.solr.client.solrj.SolrQuery; //Error: The import org.apache.solr.client.solrj.SolrQuery conflicts with a type defined in the same file import org.apache.solr.client.solrj.impl.CommonsHttpSolrServer; import org.apache.solr.client.solrj.impl.XMLResponseParser; import org.apache.solr.client.solrj.response.QueryResponse; import org.apache.solr.common.SolrDocument; import org.apache.solr.common.SolrDocumentList; public class SolrQuery { public static void main(String[] args) throws Exception { CommonsHttpSolrServer server = new CommonsHttpSolrServer("http://localhost:8080/solr"); server.setParser(new XMLResponseParser()); SolrQuery query = new SolrQuery(); query.setQuery("document"); //Error: The method setQuery(String) is undefined for the type SolrQuery query.setStart(0); //Error: The method setStart(int) is undefined for the type SolrQuery query.setRows(10); //Error: The method setRows(int) is undefined for the type SolrQuery QueryResponse response = server.query(query); //Error: The method query(SolrParams) in the type SolrServer is not applicable for the arguments (SolrQuery) SolrDocumentList documents = response.getResults(); Iterator<SolrDocument> itr = documents.iterator(); System.out.println("DOCUMENTS"); while(itr.hasNext()){ SolrDocument doc = itr.next(); System.out.println(doc.getFieldValue("id")+":"+doc.getFieldValue("content")); } } } ``` However, that example might be dated for the current api as I cant even import the SolrQuery library. Does anyone have a quick boilerplate example that works? Thank you in advance. PS. I am running windows7 with tomcat7 and solr 3.5. All I am trying to do at this point is a basic query and get the results back in some kind of list, array, whatever. When I query: `http://localhost:8080/solr/select/?q=outside` in firefox, the results come back just fine.

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