code: private void addElement(String value) {
          if (null == value) {
              return;
          }
          this.num_items++;
          this.genericValues.add(value);
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
              Tr.debug(tc, "addElement: " + value + " num: " + this.num_items);
          }
      }
docs: Add the given element to the generic no-key storage. The value must be
  in lowercase form by the time of this call.
  
  @param value - if null then nothing is stored