API Code to Close Request

import java.util.Hashtable;
import com.oimacademy.connection.Platform;
import oracle.iam.request.api.RequestService;
import oracle.iam.request.exception.AccessDeniedException;
import oracle.iam.request.exception.RequestServiceException;
import oracle.iam.request.vo.Request;
public class CloseRequestAPI {
    RequestService reqManager;
    public CloseRequestAPI() {
            super();
        }
    public static void main(String[] arg) throws RequestServiceException, AccessDeniedException
    {           
            CloseRequestAPI oim=new CloseRequestAPI();
            oim.OIMConnection();
            oim.closeReq("20541");                 
    }
    public void OIMConnection(){           
    reqManager = Platform.getService(RequestService.class);   
    }   
    public void closeReq(String userId) throws RequestServiceException,
                         AccessDeniedException {
        reqManager.closeRequest(userId);
    }
}