docs: static public int getFreeServerPort(int port){
  		int resultPort = 0;
  		ServerSocket s;
  		try {
  			s = new ServerSocket(port);
  			resultPort = s.getLocalPort();
  			s.close();
  		} catch (IOException e) {
  			resultPort = 0;
  		}
  		return resultPort;
  	}