Obtener Metadatos de un ResultSet

CREATE TABLE mitabla (
  id int(20) NOT NULL PRIMARY KEY AUTO_INCREMENT,
  nombre varchar(64) NOT NULL,
  fnacimiento date NOT NULL,
  bio varchar(500) DEFAULT NULL,
  mail varchar(32) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
/**
 * @see https://www.jc-mouse.net/
 * @author mouse
 */
public class Main {

    public static void main(String[] args) {

        String sql = " SELECT id, "
                + " nombre AS NombreCompleto,"
                + " fnacimiento AS FechaNacimiento, "
                + " bio AS Biografia "
                + " FROM mitabla ";

        try (Connection connection = DriverManager
                .getConnection("jdbc:mariadb://localhost:3306/TutorialJava", "root", "")) {
            System.out.println("Conectado a la base de datos");

            System.out.println("--- METADATOS ---");
            ResultSet resultset = connection.createStatement().executeQuery(sql);
            ResultSetMetaData resultSetMetaData = resultset.getMetaData();

            int totalCoumnas = resultSetMetaData.getColumnCount();
            System.out.println("Total columnas: " + totalCoumnas);
            for (int col = 1; col <= totalCoumnas; col++) {
                System.out.println("\n--------------------------");
                System.out.println("TABLA: " + resultSetMetaData.getColumnName(col));
                System.out.println(" Tipo: " + resultSetMetaData.getColumnTypeName(col)
                        + " Tamaño: " + resultSetMetaData.getColumnDisplaySize(col));
                //isNullable() donde 0: columnNoNulls 1: columnNullable 2: columnNullableUnknown
                System.out.println(" Es Nullable: " + resultSetMetaData.isNullable(col));
                System.out.println(" Autoincrementable: " + resultSetMetaData.isAutoIncrement(col));
                System.out.println(" Label: " + resultSetMetaData.getColumnLabel(col));
            }

            connection.close();
            System.out.println("\nDesconectado de la base de datos");
        } catch (SQLException ex) {
            System.err.println(ex.getMessage());
        }
    }

}