public class DBConnection {

    static Connection connection;
    static org.postgresql.jdbc2.optional.ConnectionPool connectionPool = new ConnectionPool();

    public DBConnection() throws SQLException {

        System.out.println("-------- PostgreSQL "
                + "JDBC Connection Testing ------------");

        try {

            Class.forName("org.postgresql.Driver");

        } catch (ClassNotFoundException e) {

            System.out.println("Where is your PostgreSQL JDBC Driver? "
                    + "Include in your library path!");
            e.printStackTrace();
            return;

        }

        System.out.println("PostgreSQL JDBC Driver Registered!");


        connectionPool.setUser("postgres");
        connectionPool.setPassword("toor");
        connectionPool.setUrl("jdbc:postgresql://127.0.0.1:5432/bank_database");
        connectionPool.setSspiServiceClass("org.postgresql.Driver");

            connection = DriverManager.getConnection(
                    "jdbc:postgresql://127.0.0.1:5432/bank_database", "postgres",
                    "toor");
        System.out.println(connectionPool.getConnection().toString());

    }