Oracle BPM : Assign or Remove user from Application role using BPM api's

Below is the java code to assign or remove user from a role , same functionality is present in bpm workspace admin.

	package com.raylabs.bpm;

	import java.util.HashMap;
	import java.util.Iterator;
	import java.util.List;
	import java.util.Map;

	import oracle.bpel.services.bpm.common.IBPMContext;
	import oracle.bpel.services.workflow.client.IWorkflowServiceClientConstants;
	import oracle.bpel.services.workflow.client.WorkflowServiceClientFactory;

	import oracle.bpm.client.BPMServiceClientFactory;
	import oracle.bpm.services.client.IBPMServiceClient;
	import oracle.bpm.services.organization.IBPMOrganizationService;
	import oracle.bpm.services.organization.model.AppRoleRefType;
	import oracle.bpm.services.organization.model.ApplicationContext;
	import oracle.bpm.services.organization.model.ApplicationContextTypeEnum;
	import oracle.bpm.services.organization.model.ApplicationRoleType;
	import oracle.bpm.services.organization.model.ApplicationRoles;
	import oracle.bpm.services.organization.model.Organization;
	import oracle.bpm.services.organization.model.Participant;
	import oracle.bpm.services.organization.model.ParticipantTypeEnum;

	public class Class1 {
	private static String username;
	private static String password;
	private static String environment;
	private static String serverPort;
	private static String user;
	private static String role;

	private Class1() {
	super();
	}

	public static void main(String[] args) {
	username = "xx";
	password = "xxxx";
	environment = "dev";
	serverPort = "34444";
	user = "xxxx";
	role = "APPROVER";
	BPMServiceClientFactory wfSvcClient = null;
	IBPMContext bpmCtx = null;
	IBPMServiceClient bPMServiceClient = null;
	try {
	final Map connectionProperty = getConnProp();
	wfSvcClient =
	BPMServiceClientFactory.getInstance(connectionProperty,
	null, null);
	bPMServiceClient = wfSvcClient.getBPMServiceClient();
	IBPMOrganizationService bpmOrgSvc =
	bPMServiceClient.getBPMOrganizationService();
	bpmCtx =
	(IBPMContext)wfSvcClient.getWorkflowServiceClient().getTaskQueryService().authenticate(null,
	null,
	null);

	Organization org = bpmOrgSvc.exportOrganization(bpmCtx);
	ApplicationRoles applicationRoles = org.getApplicationRoles();
	List<ApplicationRoleType> roleList =
	applicationRoles.getApplicationRole();
	Iterator<ApplicationRoleType> iterator = roleList.iterator();
	while (iterator.hasNext()) {
	ApplicationRoleType applicationRoleType = iterator.next();
	if (applicationRoleType.getName().equals(role)) {
	ApplicationContext appContext = new ApplicationContext();
	appContext.setApplicationType(ApplicationContextTypeEnum.ORACLE_BPM_PROCESS_ROLES_APP);
	AppRoleRefType appRole = new AppRoleRefType();
	appRole.setType(ParticipantTypeEnum.USER);
	appRole.setName(user);
	bpmOrgSvc.grantAppRoleToPrincipal(bpmCtx, appContext, role,
	new Participant(appRole));
	System.out.println("Added user " + user + " to Role " +
	role);
	// bpmOrgSvc.revokeAppRoleFromPrincipal(bpmCtx, appContext, role, new Participant(appRole));
	// System.out.println("Removed user "+user+" from Role "+role);
	}
	}

	} catch (Exception e) {
	e.printStackTrace();
	} finally {
	}

	}

	public static Map getConnProp() throws Exception {
	final Map connProp = new HashMap();
	try {
	connProp.put(IWorkflowServiceClientConstants.CONNECTION_PROPERTY.EJB_INITIAL_CONTEXT_FACTORY,
	"weblogic.jndi.WLInitialContextFactory");
	connProp.put(IWorkflowServiceClientConstants.CONNECTION_PROPERTY.EJB_PROVIDER_URL,
	"t3://" + environment +
	"-abc.com:" + serverPort);
	connProp.put(IWorkflowServiceClientConstants.CONNECTION_PROPERTY.EJB_SECURITY_PRINCIPAL,
	username);
	connProp.put(IWorkflowServiceClientConstants.CONNECTION_PROPERTY.EJB_SECURITY_CREDENTIALS,
	password);
	connProp.put(IWorkflowServiceClientConstants.CONNECTION_PROPERTY.CLIENT_TYPE,
	WorkflowServiceClientFactory.REMOTE_CLIENT);
	} catch (Exception e) {
	e.printStackTrace();
	}
	return connProp;
	}

	}