Connection conn = null;
private static final Logger LOG = Logger.getLogger(PostgreSQLDBDAOFactory.class.getName());

public PostgreSQLDBDAOFactory() throws ClassNotFoundException {
    try {
        Class.forName("org.postgresql.Driver");
        String url = "jdbc:postgresql://localhost:5432/CarsAPJ";
        String user  = "petr";
        String password = "pass";
        conn = DriverManager.getConnection(url, user, password);
        ...}
    ...
    }
...