String (Object element) { final TreeSet<WorkingSetSerializable> serializables = ourSerializables.get(element.getClass().getName()); if (serializables != null && !serializables.isEmpty()) { final WorkingSetSerializable last = serializables.last(); try { final StringBuilder sb = new StringBuilder(); sb.append(last.getId()); sb.append(' '); sb.append(last.getVersion()); sb.append(' '); last.serializeMe(element, sb); return sb.toString(); } catch (IOException e) { LOG.info(e); return null; } } return null; }