Programatically add members to an RTC Access Group

    public IContributor getUserById(String id) throws TeamRepositoryException{
        return repo.contributorManager().fetchContributorByUserId(id, MONITOR);
    }



        IContributor[] contributors = {null};
        IAccessGroupClientService service = (IAccessGroupClientService) repo.getClientLibrary(IAccessGroupClientService.class);

        // Get user
        try {            
            contributors[0] = getUserById(user);
        } catch (TeamRepositoryException e) {
            return ("ERROR:");            
        }

        IAccessGroup groups[] = service.getAccessGroups(accessGroup, MONITOR);
        if (groups.length == 0) {
            throw new TeamRepositoryException("Could not find accessGroup " + accessGroup);
        }
        
        // Remove user to access group
        IAccessGroup workGroup = (IAccessGroup) groups[0].getWorkingCopy();
        workGroup.add(contributors[0]); 

        // to remove       workGroup.remove(contributors[0]); 
     
        service.save(workGroup,MONITOR);