docs: public static File getServerOutputDir(String serverName, boolean isClient) {
          if (serverName == null) {
              throw new IllegalArgumentException("Parameter serverName can not be 'null'");
          }
          File outputDir = Utils.getOutputDir(isClient);
          if (outputDir != null) {
              return new File(outputDir, serverName);
          }
          return getServerConfigDir(serverName);
      }