code: Connection getDataSourceConnection() {
          Connection connection = null;
          try {
              connection = dataSource.getConnection();
          } catch (SQLException ex) {
              throw new InitializationException("Could not obtain the db connection: Cannot get connection", ex);
          }
          return connection;
      }
docs: Gets the data source connection.
  
  @return the data source connection
  @since 2.4.0