Impossible to remove a named rule from the notification manager

    public void addNamedRule(String name, XWikiNotificationRule rule) {
        synchronized (namedrules) {
            Vector vnamedrules = (Vector) namedrules.get(name);
            if (vnamedrules==null) {
                vnamedrules = new Vector();
                namedrules.put(name, vnamedrules);
            }
            vnamedrules.add(rule);
        }
    }

    public void removeNamedRule(String name) {
        synchronized (namedrules) {
            Vector vnamedrules = (Vector) namedrules.get(name);
            if (vnamedrules!=null) {
                vnamedrules.remove(name);
                if (vnamedrules.size()==0)
                    namedrules.remove(name);
            }
        }
    }