code: @Override
      public Discriminator getDiscriminator() {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEventEnabled()) {
              Tr.event(tc, "getDiscriminator called erroneously on TCPChannel");
          }
          return null;
      }
docs: /*
  @see com.ibm.wsspi.channelfw.InboundChannel#getDiscriminator()