How can i assign multiple process roles to a user in a team area in RTC using plain java api?

Hello,

I need help in adding a user and assigning/adding him/her with multiple process roles in a team area. I have an array where i will be getting the process roles that i need to assign to the user.

static String role[] = new String[] {"Product Owner","User"};

I'm using the code below that i found here in jazz. It's working but the only process role that is being assigned is the last process role in the array. I think it's because of the new keyword for the IContributor and IRole in addContributorsSettingRoleCast, it just overwrites the current process role of the added user everytime it loops.

                    if (teamArea.getName().equals(teamAreaName)) {
                        System.out.println("Adding user to " + teamArea.getName() + " team area");
                       
                        IProcessItemService service = (IProcessItemService) teamRepository.getClientLibrary(IProcessItemService.class);
                        IProcessAreaWorkingCopy areaWc = (IProcessAreaWorkingCopy) service.getWorkingCopyManager().createPrivateWorkingCopy(teamArea);
                        IContributor contributor = teamRepository.contributorManager().fetchContributorByUserId(memberId, null);
                       
                        areaWc.getTeam().addContributors(new IContributor[] {contributor});
                       
                        for (int i = 0; i < role.length; i++) {
                            IRole roles = getRole(teamArea, role[i]);
                            areaWc.getTeam().addContributorsSettingRoleCast(new IContributor[] {contributor}, new IRole[] {roles});
                        }
                        System.out.println("Added " + contributor.getName());
                        areaWc.save(myProgressMonitor);
                    }

    public static IRole getRole(IProcessArea processArea, String processRole) throws TeamRepositoryException {
        IProcessItemService service =(IProcessItemService) teamRepository.getClientLibrary(IProcessItemService.class);
        IClientProcess clientProcess = service.getClientProcess(processArea, null);
        IRole[] availableRoles = clientProcess.getRoles(processArea, null);
        for (int i = 0; i < availableRoles.length; i++) {
            if (availableRoles[i].getId().equals(processRole)) {
                return availableRoles[i];
            }
        }

Can addContributorsSettingRoleCast be used in adding multiple process roles? I tried using it with an ArrayList but there is an error with that. Can i use something else aside from addContributorsSettingRoleCast to add multiple process roles?