Custom Request handler Error:

[Noor]

hi,
 i am new to apache solr.
I need to create a custom request handler class. So i create a new one 
and changed the solr-config.xml file as,
  <requestHandler name="/select" class="solr.my.MyCustomHandler">
       <lst name="defaults">
           <str name="echoParams">explicit</str>
           <str name="q">tandem</str>
           <str name="debugQuery">true</str>
       </lst>
   </requestHandler>
And in my java class, the code is,

public class MyCustomHandler extends RequestHandlerBase{
  public CoreContainer coreContainer;
  public void handleRequestBody(SolrQueryRequest request, 
SolrQueryResponse response) throws Exception {
       SolrCore coreToRequest = coreContainer.getCore("core2");
       ModifiableSolrParams params = new ModifiableSolrParams();
       params.set("echoParams", "explicit");
       params.set("q", "text");
       params.set("debugQuery", "true");
request = new LocalSolrQueryRequest(coreToRequest, params);
//      
       SolrRequestHandler reqHandler = 
coreToRequest.getRequestHandler("/select");
       coreToRequest.execute(reqHandler, request, response);
       coreToRequest.close();
       request.close();
   }
 // the abstract methods - getDescription(), getSourceId(), 
getSource(), getVersion() are //overrided... but these methods doesn't 
have any implementations.
}


But, if i search any text in my webapp from browser, gots the HTTP 500 
error.
i dont know how SolrContainer is intialized....
Pls anyone give me the solution...

thanks and regards,
Mohamed