code: public static MySqlConnectionPoolBuilder newBuilder(final String connectionString, final String username) {
      final String[] arr = connectionString.split(":");
      final String host = arr[0];
      final int port = Integer.parseInt(arr[1]);
      return newBuilder(host, port, username);
    }
docs: Warning - Use only when the connection string is in host:port format without schema and other parameter.
  example: mydb.company.com:3308
  
  @param connectionString host:port
  @param username         user name for login.