How to configure Spring Data Solr with Repositories for multiple cores

Question

Is there a detailed and complete explanation for setting up spring data with solr using repositories with multicore support?

Answer 1

The only dependency that need to be used for spring-data-solr is

<dependency>
    <groupId>org.springframework.data</groupId>
    <artifactId>spring-data-solr</artifactId>
    <version>1.5.2.RELEASE</version>
</dependency>

It downloads solrj dependency and this must not be overridden with later versions of solrj. Also It is always preferable to use HttpSolrServer over EmbeddedSolrServer which is what we will be working with.

The Configuration class should look like this:

@Configuration
@EnableSolrRepositories(value = "com.package.",multicoreSupport = true)
public class SolrConfig
{
    @Bean
    public SolrServer solrServer() throws Exception
    {
        HttpSolrServerFactoryBean f = new HttpSolrServerFactoryBean();
        f.setUrl("http://localhost:8983/solr");
        f.afterPropertiesSet();
        return f.getSolrServer();
    }

    @Bean
    public SolrTemplate solrTemplate(SolrServer solrServer) throws Exception
    {
        return new SolrTemplate(solrServer());
    }
}

The document entity should contain information about which core they belong to

@SolrDocument(solrCoreName = "core1")
public class Document1
{
    @Id
    @Field
    private String id;

    /**other attributes**/
}

The other document should be

@SolrDocument(solrCoreName = "core2")
public class Document2
{
    @Id
    @Field
    private String id;

    /**other attributes**/
}

Now the best part is you are already done. Simply setting up repository in the plain old way does the trick

public interface SolrCore1Repository extends SolrCrudRepository<Document1,String>
{
    // optional code
}

the other repo is like

public interface SolrCore2Repository extends SolrCrudRepository<Document2,String>
{
    // optional code
}

Once solr is running on the url specified and it has fields according to the pojo, you are done.