How to use

openConnectionImpl

method

in

org.postgresql.core.ConnectionFactory

ProtocolConnection connection = factory.openConnectionImpl(host, port, user, database, info, logger);
if (connection != null)
  return connection;

QueryExecutor queryExecutor = connectionFactory.openConnectionImpl(
  hostSpecs, user, database, info);
if (queryExecutor != null) {

ProtocolConnection connection = factory.openConnectionImpl(host, port, user, database, info, logger);
if (connection != null)
  return connection;

ProtocolConnection connection = factory.openConnectionImpl(host, port, user, database, info, logger);
if (connection != null)
  return connection;