How to pass VM name to Workflow using JavaSDK?

Hi

      How to pass VM name to Workflow using JavaSDK? I tried passing VM name as parameter, but it is getting failed with error " 400 1 error(s) found: [ { Virtual machine to power off - This field is required. } ]" .

find below code..

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.URI;

import java.net.URL;

import com.vmware.o11n.sdk.rest.client.DefaultVcoSessionFactory;

import com.vmware.o11n.sdk.rest.client.VcoSession;

import com.vmware.o11n.sdk.rest.client.VcoSessionFactory;

import com.vmware.o11n.sdk.rest.client.authentication.Authentication;

import com.vmware.o11n.sdk.rest.client.services.ExecutionContextBuilder;

import com.vmware.o11n.sdk.rest.client.services.ExecutionService;

import com.vmware.o11n.sdk.rest.client.services.ParameterExtractor;

import com.vmware.o11n.sdk.rest.client.services.PresentationService;

import com.vmware.o11n.sdk.rest.client.services.WorkflowService;

import com.vmware.o11n.sdk.rest.client.stubs.ExecutionContext;

import com.vmware.o11n.sdk.rest.client.stubs.Parameter;

import com.vmware.o11n.sdk.rest.client.stubs.Presentation;

import com.vmware.o11n.sdk.rest.client.stubs.PresentationExecution;

import com.vmware.o11n.sdk.rest.client.stubs.Workflow;

import com.vmware.o11n.sdk.rest.client.stubs.WorkflowExecution;

import com.vmware.o11n.sdk.rest.client.stubs.WorkflowExecutionState;

import com.vmware.o11n.sdk.rest.client.stubs.Workflow.InputParameters;

public class ConnectVCO

{

    public static void main(String args[])

    {

    try{

    VcoSession session = DefaultVcoSessionFactory.newSsoSession(new URI("https://Win2K8:8281/api/"), new URI("https://SSOServer:7444/ims/STSService"), 300000,"user", "pass");

            //create the services

            WorkflowService workflowService = new WorkflowService(session);

            ExecutionService executionService = new ExecutionService(session);

            //find a workflow by ID

            Workflow workflow = workflowService.getWorkflow("e6820263-366a-487c-be29-1cxdc23db7e5"); //Workflow to "Power off virtual machine and wait"

            //create an ExecutionContext from the user's input

            ExecutionContext context = new ExecutionContextBuilder().addParam("vm","testVCOCust").build();

            //run the workflow

            WorkflowExecution execution = executionService.execute(workflow, context);

            execution = executionService.awaitState(execution, 500, 10, WorkflowExecutionState.CANCELED, WorkflowExecutionState.FAILED, WorkflowExecutionState.COMPLETED);

            String nameParamValue = new ParameterExtractor().fromTheOutputOf(execution).extractString("name");

            System.out.println("workflow was executed with 'name' input set to" + nameParamValue);

            //wait for the workflow to reach the user interaction state, checking every 500 milliseconds

            //execution = executionService.awaitState(execution, 500, 10, WorkflowExecutionState.CANCELED, WorkflowExecutionState.FAILED, WorkflowExecutionState.COMPLETED);

            //String nameParamValue = new ParameterExtractor().fromTheOutputOf(execution).extractString("name");

            //System.out.println("workflow was executed with 'name' input set to"+nameParamValue);

    }

    catch(Exception e)

    {

        System.out.println(e);

    }

}

}

If someone can help??