Duvida de banco de JDBC

Bom tarde pessoal, estou com problemas com jdbc, o codigo não apresenta erro, mas não está inserindo e nem removendo, apenas listando, vou por o codigo para vcs, valeu abraço

package conexao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DataBase {
    static Connection getConnection() throws SQLException {
        Connection connection = DriverManager
                .getConnection("jdbc:hsqldb:file:C:/Users/julian/Desktop/hypersql/loja-virtual", "SA", "1234");
        return connection;
    }
}

package conexao;

import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;

public class TestaRemocao {

    public static void main(String[] args) throws SQLException {

        Connection connection = DataBase.getConnection();
        Statement stmt = connection.createStatement();
        stmt.execute("delete from produto where id > 3");

        int count = stmt.getUpdateCount();
        System.out.println(count + "linhas atualizadas");    

        connection.close();

    }

}

package conexao;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class TestaInsercao {

    public static void main(String[] args) throws SQLException {

        Connection connection = DataBase.getConnection();

        Statement statement = connection.createStatement();
        boolean resultado = statement.execute("insert into produto(nome, descricao)values('Notebook', 'Notebook i5')",
                Statement.RETURN_GENERATED_KEYS);

        System.out.println(resultado);

        ResultSet resultset = statement.getGeneratedKeys();

        while(resultset.next()) {
            String id = resultset.getString("id");
            System.out.println(id + "gerado");

        }
        statement.close();
        connection.close();
    }

}