public byte[] getData(String s) throws PropertyException {
   return ps.getData(s);
 }
  public String getDataPropertyValue(String prefix, String key) throws Exception {
    byte[] valueBytes =
        propertySet.getData("serverNode_" + this.getServerNodeId() + "_" + prefix + "_" + key);

    return (valueBytes != null ? new String(valueBytes, "utf-8") : "");
  }