FolderEvent event = new FolderEvent(this, folder, type);
FolderEvent event = new FolderEvent(this,this,type);
    protected void notifyFolderListeners(int type, Folder folder) {        Iterator it = _folderListeners.iterator();        FolderEvent event = new FolderEvent(this, folder, type);        while (it.hasNext()) {            FolderListener listener = (FolderListener) it.next();            event.dispatch(listener);        }    }