docs: public static Tuple2<String, Integer> getJobManagerAddress(Configuration configuration) throws ConfigurationException {
  
  		final String hostname = configuration.getString(JobManagerOptions.ADDRESS);
  		final int port = configuration.getInteger(JobManagerOptions.PORT);
  
  		if (hostname == null) {
  			throw new ConfigurationException("Config parameter '" + JobManagerOptions.ADDRESS +
  				"' is missing (hostname/address of JobManager to connect to).");
  		}
  
  		if (port <= 0 || port >= 65536) {
  			throw new ConfigurationException("Invalid value for '" + JobManagerOptions.PORT +
  				"' (port of the JobManager actor system) : " + port +
  				".  it must be greater than 0 and less than 65536.");
  		}
  
  		return Tuple2.of(hostname, port);
  	}