code: public ClientConfig setBootstrapUrls(List<String> bootstrapUrls) {
          this.bootstrapUrls = Utils.notNull(bootstrapUrls);
          if(this.bootstrapUrls.size() <= 0)
              throw new IllegalArgumentException("Must provide at least one bootstrap URL.");
          return this;
      }
docs: Set the bootstrap urls from which to attempt a connection
  
  @param bootstrapUrls The urls to bootstrap from