if (tag == null || axisId== null) { Log.error("Missing information: need tag AND axisId for addAxisTag. Ignoring request. returning null"); return; }
  public void setAxisTag(String tag, String axisId) {    if (tag == null || axisId== null) {      Log.error("Missing information: need tag AND axisId for addAxisTag. Ignoring request. returning null");      return;    }    //insert in hash table, return tag value    tagHash.put(axisId, tag);  }