code: public MucEnterConfiguration.Builder getEnterConfigurationBuilder(Resourcepart nickname) {
          return new MucEnterConfiguration.Builder(nickname, connection.getReplyTimeout());
      }
docs: Get a new MUC enter configuration builder.
  
  @param nickname the nickname used when entering the MUC room.
  @return a new MUC enter configuration builder.
  @since 4.2