How to create access groups programmatically?

Java Client API code:

IAccessGroupClientService clientService = (IAccessGroupClientService) repo.getClientLibrary(IAccessGroupClientService.class);
IWorkItemCommon workItemCommon = (IWorkItemCommon)repo.getClientLibrary(IWorkItemCommon.class);
accessGroup = (IAccessGroup) workItemCommon.getAuditableCommon().createAuditable(IAccessGroup.ITEM_TYPE);
accessGroup.setName(strAccessGroupName);

//Add at least one IProjectArea, ITeamArea or IContributor
accessGroup.add(projectArea, ReadAccessContextType.MEMBERS);

clientService.save(accessGroup, null);