code: @Override
      public byte[] serviceData() throws LogClosedException, InternalLogException {
          if (tc.isEntryEnabled())
              Tr.entry(tc, "serviceData", this);
  
          if (tc.isEntryEnabled())
              Tr.exit(tc, "serviceData", null);
          return null;
      }
docs: Returns a copy of the service data or null if there is none defined. Changes to
  the copy will have no affect on the service data stored by the RLS.
  
  @return The service data.
  
  @exception LogClosedException Thrown if the recovery log is closed and must
  be opened before this call can be issued.
  @exception InternalLogException Thrown if an unexpected error has occured.