Need to pass test case in QC through Java

Could any one help me in below issue I want to pass test cases in QC through Java, I used con4j and reached till test sets but I am unable to fetch the test cases under respective test set. could any one please help me in how to pass test cases in QC through com4j

import com.qc.ClassFactory;
import com.qc.ITDConnection;
import com.qc.ITestLabFolder;
import com.qc.ITestSetFactory;
import com.qc.ITestSetTreeManager;
import com.qc.ITestSetFolder;
import com.qc.IList;
import com.qc.ITSTest;
import com.qc.ITestSet;
import com.qc.ITestFactory;
import com4j.*;
import com4j.stdole.*;
import com4j.tlbimp.*;
import com4j.tlbimp.def.*;
import com4j.tlbimp.driver.*;
import com4j.util.*;
import com4j.COM4J;
import java.util.*;
import com.qc.IRun;
import com.qc.IRunFactory;


public class Qc_Connect {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        String url="http://abc/qcbin/";
        String domain="abc";
        String project="xyz";
        String username="132222";
        String password="Xyz";
        String strTestLabPath = "Root\\Test\\"; 
        String strTestSetName = "TestQC";   


                try{
            ITDConnection itd=ClassFactory.createTDConnection();
            itd.initConnectionEx(url);
            System.out.println("COnnected To QC:"+ itd.connected());

            itd.connectProjectEx(domain,project,username,password);

            System.out.println("Logged into QC");

            //System.out.println("Project_Connected:"+ itd.connected());


            ITestSetFactory objTestSetFactory = (itd.testSetFactory()).queryInterface(ITestSetFactory.class);
            ITestSetTreeManager objTestSetTreeManager = (itd.testSetTreeManager()).queryInterface(ITestSetTreeManager.class);

           ITestSetFolder objTestSetFolder =(objTestSetTreeManager.nodeByPath(strTestLabPath)).queryInterface(ITestSetFolder.class);

           IList its1 = objTestSetFolder.findTestSets(strTestSetName, true, null);
          //IList ls= objTestSetFolder.findTestSets(strTestSetName, true, null);
          System.out.println("No. of Test Set:" + its1.count());
          ITestSet tst= (ITestSet) objTestSetFolder.findTestSets(strTestSetName, true, null).queryInterface(ITSTest.class);
          System.out.println(tst.name());
          //System.out.println( its1.queryInterface(ITestSet.class).name());

          /* foreach (ITestSet testSet : its1.queryInterface(ITestSet.class)){  
           ITestSetFolder tsFolder = (ITestSetFolder)testSet.TestSetFolder;    
           ITSTestFactory tsTestFactory = (ITSTestFactory)testSet.TSTestFactory;   
           List tsTestList = tsTestFactory.NewList("");
           }*/





          /* Com4jObject comObj = (Com4jObject) its1.item(0);
           ITestSet tst = comObj.queryInterface(ITestSet.class); 
           System.out.println("Test Set Name : " + tst.name());
           System.out.println("Test Set ID : " + tst.id());
           System.out.println("Test Set ID : " + tst.status());
           System.out.println("Test Set ID : " );*/


                System.out.println(its1.count());
           System.out.println("TestSet Present");

           Iterator itr = its1.iterator();
           System.out.println(itr.hasNext());
           while (itr.hasNext())
           {
               Com4jObject  comObj = (Com4jObject) itr.next();
           ITestSet sTestSet = comObj.queryInterface(ITestSet.class);
           System.out.println(sTestSet.name());
           Com4jObject comObj2 = sTestSet.tsTestFactory();
           ITestSetFactory test = comObj2.queryInterface(ITestSetFactory.class);
           }

          // ITSTest tsTest=null;
          // tsTest.
           //its1.
          /* comObj = (Com4jObject) its1.item(1);
           ITSTest tst2=comObj.queryInterface(ITSTest.class);*/
        //  System.out.println( tst2.name());
       /*    foreach (ITSTest tsTest : tst2)
        {
         IRun lastRun = (IRun)tsTest.lastRun();
         if (lastRun == null)
         {
            IRunFactory runFactory = (IRunFactory)tsTest.runFactory;
                        String date = "20160203";
                   IRun run = (IRun)runFactory.addItem( date);
                   run.status("Pass");
                   run.autoPost();
         }

        }*/
                }
        catch(Exception e){

            e.printStackTrace();
        }
    }

}

Why not build a client to access the REST API instead of passing through the OTA interface?

Once you build a basic client, you can post runs and update their status quite easily.