code: @Override
      public void start() {
          if (this.started) {
              throw new IllegalStateException("The stub server has been started already.");
          }
          
          logger.debug("starting the underlying stub server...");
          
          this.server.registerRequestManager(this);
  
          try {
              server.start();
          } catch (final Exception ex) {
              throw new JadlerException("Stub http server start failure", ex);
          }
          this.started = true;
      }
docs: {@inheritDoc}