ResourcePlanningService.java has this, it might be helpful  


 private void getTeamAreas(final ItemCollection<IContributorHandle> contributors, final ItemAwareMap<IContributorHandle, ItemCollection<IProcessArea>> result) throws TeamRepositoryException {
        final IRepositoryItemService repositoryService= getService(IRepositoryItemService.class);
        final IQueryService queryService= getService(IQueryService.class);
        IItemQuery query= IItemQuery.FACTORY.newInstance(ProcessAreaQueryModel.ROOT);
        IPredicate contributorPredicate= ProcessAreaQueryModel.ROOT.contributors()._contains(query.newItemHandleArg());
        for (int index= 0; index < contributors.size() - 1; index++)
            contributorPredicate= contributorPredicate._or(ProcessAreaQueryModel.ROOT.contributors()._contains(query.newItemHandleArg()));
        query= (IItemQuery) query.filter(contributorPredicate).distinct();
        final ItemQueryIterator<IProcessArea> iterator= new ItemQueryIterator<IProcessArea>(queryService, repositoryService, query, contributors.toArray(new IContributorHandle[contributors.size()]));
        while (iterator.hasNext()) {
            final List<IProcessArea> areas= iterator.next();
            for (final IProcessArea area : areas) {
                final IContributorHandle[] members= area.getMembers();
                for (final IContributorHandle member : members) {
                    ItemCollection<IProcessArea> collection= result.get(member);
                    if (collection == null) {
                        collection= new ItemHashSet<IProcessArea>(AVERAGE_TEAMS);
                        result.put(member, collection);
                    }
                    collection.add(area);
                }
            }
        }
    }

A better way
        IProcessItemService processItemService = (IProcessItemService) repo.getClientLibrary(IProcessItemService.class);
        List processAreasOfUser= processItemService.findProcessAreas(repo.loggedInContributor(), null, IProcessClientService.ALL_PROPERTIES , MONITOR);
        Iterator b = processAreasOfUser.iterator();
        while (b.hasNext()) {               
            IProcessArea processArea = (IProcessArea) b.next();
            if (processArea.getItemType().getName().equals("TeamArea")) {
                System.out.println(processArea.getName());
            }
        }

this link is useful
http://rsjazz.wordpress.com/2012/12/09/analyzing-a-aroject-areas-members-and-roles-using-the-plain-java-client-libraries/