/**
     * All users
     */
    public Collection getAllUsers() {
        Collection users = new ArrayList();
        try {
            Collection nodes = getHierarchyManager().getContent("/admin").getChildren(ItemType.USER);
            Collection nodes2= getHierarchyManager().getContent("/system").getChildren(ItemType.USER);
            //we always have a superuser so nodes2 can't be null right? 
            //and because some collections refuse to add null elements
            if (nodes !=null)  
            	nodes2.addAll(nodes);
            for (Iterator iter = nodes2.iterator(); iter.hasNext();) {
                users.add(new MgnlUser((Content) iter.next()));
            }
        }
        catch (Exception e) {
            log.error("can't find user");
        }
        return users;
    }