How to Setup HSQLDB Connection and Update

package example.jdbc.hsql;
 
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Savepoint;
import java.sql.Statement;
 
public class MainClass {
    public static void main(String[] args) {
	Connection connection = null;
	Statement statement = null;
	try {
	    Class.forName("org.hsqldb.jdbcDriver").newInstance();
	    String url = "jdbc:hsqldb:hsqldb\\demoDatabase";
	    connection = DriverManager.getConnection(url, "username", "password");
	    connection.setAutoCommit(false);
 
	    statement = connection.createStatement();
 
	    String update1 = "UPDATE employees SET email = 'a@b.com' WHERE email = 'a@a.com'";
	    statement.executeUpdate(update1);
	    Savepoint savepoint1 = connection.setSavepoint("savepoint1");
 
	    String update2 = "UPDATE employees SET email = 'b@b.com' WHERE email = 'b@c.com'";
	    statement.executeUpdate(update2);
	    Savepoint savepoint2 = connection.setSavepoint("savepoint2");
 
	    String update3 = "UPDATE employees SET email = 'c@c.com' WHERE email = 'c@d.com'";
	    statement.executeUpdate(update3);
	    Savepoint savepoint3 = connection.setSavepoint("savepoint3");
 
	    String update4 = "UPDATE employees SET email = 'd@d.com' WHERE email = 'd@e.com'";
	    statement.executeUpdate(update4);
	    Savepoint savepoint4 = connection.setSavepoint("savepoint4");
 
	    String update5 = "UPDATE employees SET email = 'e@e.com' WHERE email = 'e@f.com'";
	    statement.executeUpdate(update5);
	    Savepoint savepoint5 = connection.setSavepoint("savepoint5");
 
	    connection.rollback(savepoint3);
	    connection.commit();
	} catch (Exception e) {
	    e.printStackTrace();
	} finally {
	    if (statement != null) {
		try {
		    statement.close();
		} catch (SQLException e) {
		} // nothing we can do
	    }
	    if (connection != null) {
		try {
		    connection.close();
		} catch (SQLException e) {
		} // nothing we can do
	    }
	}
    }
}