EmbeddedSolrServer vs CommonsHttpSolrServer

[dcdmailbox-info]

Hi all,

I am new to solr/solrj.

I correctly started up the server example given in the distribution 
(apache-solr-1.4.0\example\solr), populated the index with test data set, and 
successfully tested with http query string via browser (es. 
http://localhost:8983/solr/select/?indent=on&q=video&fl=name,id)

I am trying to set up solrj clients using both CommonsHttpSolrServer and 
EmbeddedSolrServer.

My examples are with single core configuration.

Here below the method used for CommonsHttpSolrServer initialization:

[code.1]
    public SolrServer getCommonsHttpSolrServer() throws IOException, 
ParserConfigurationException, SAXException, SolrServerException {
        String url = "http://localhost:8983/solr";;
        CommonsHttpSolrServer server = new CommonsHttpSolrServer(url);
        server.setSoTimeout(1000); // socket read timeout
        server.setConnectionTimeout(100);
        server.setDefaultMaxConnectionsPerHost(100);
        server.setMaxTotalConnections(100);
        server.setFollowRedirects(false); // defaults to false
        // allowCompression defaults to false.
        // Server side must support gzip or deflate for this to have any effect.
        server.setAllowCompression(true);
        server.setMaxRetries(1); // defaults to 0. > 1 not recommended.
        return server;
    }

Here below the method used for EmbeddedSolrServer initialization (provided in 
the wiki section):

[code.2]
    public SolrServer getEmbeddedSolrServer() throws IOException, 
ParserConfigurationException, SAXException, SolrServerException {
        System.setProperty("solr.solr.home", 
"/WORKSPACE/bin/apache-solr-1.4.0/example/solr");
        CoreContainer.Initializer initializer = new CoreContainer.Initializer();
        CoreContainer coreContainer = initializer.initialize();
        EmbeddedSolrServer server = new EmbeddedSolrServer(coreContainer, "");
        return server;
    }

Here below the common code used to query the server: 
[code.3]

            SolrServer server = mintIdxMain.getEmbeddedSolrServer();
            //SolrServer server = mintIdxMain.getCommonsHttpSolrServer();

            SolrQuery query = new SolrQuery("video");
            QueryResponse rsp = server.query(query);
            SolrDocumentList docs = rsp.getResults();

            System.out.println("Found    : " + docs.getNumFound());
            System.out.println("Start    : " + docs.getStart());
            System.out.println("Max Score: " + docs.getMaxScore());

 
CommonsHttpSolrServer gives correct results whereas EmbeddedSolrServer gives 
always no results.
What's wrong with the initialization and/or the configuration of the 
EmbeddedSolrServer?
CoreContainer.Initializer() seems to not recognize the single core from 
solrconfig.xml...

If I modify [code.2] with the following code, it seems to work. 
I manually added only explicit Core Container registration. 
Is [code.4] the correct way?

[code.4]
    public SolrServer getEmbeddedSolrServer() throws IOException, 
ParserConfigurationException, SAXException, SolrServerException {
        System.setProperty("solr.solr.home", 
"/WORKSPACE/bin/apache-solr-1.4.0/example/solr");
        
        CoreContainer.Initializer initializer = new CoreContainer.Initializer();
        CoreContainer coreContainer = initializer.initialize();
        
        /* >>>>> */
        SolrConfig solrConfig = new 
SolrConfig("/WORKSPACE/bin/apache-solr-1.4.0/example/solr", "solrconfig.xml", 
null);
        IndexSchema indexSchema = new IndexSchema(solrConfig, "schema.xml", 
null);
        CoreDescriptor coreDescriptor = new CoreDescriptor(coreContainer, "", 
solrConfig.getResourceLoader().getInstanceDir());
        SolrCore core = new SolrCore(null, 
"/WORKSPACE/bin/apache-solr-1.4.0/example/solr/data", solrConfig, indexSchema, 
coreDescriptor);
        coreContainer.register("", core, false);
        /* <<<<< */
        
        EmbeddedSolrServer server = new EmbeddedSolrServer(coreContainer, "");
        return server;
    }

Many thanks in advance for the support and the great work realized with all the 
lucene/solr projects.

Dino.
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