Dúvida no Ex. 3 da Aula 2 - Inserindo e removendo dados

Boa tarde Gurus. Mais uma pergunta:

Estou recebendo o erro:

Exception in thread "main" java.sql.SQLException: java.lang.NoClassDefFoundError: org/hsqldb/navigator/RowSetNavigatorDataChangeMemory java.lang.NoClassDefFoundError: org/hsqldb/navigator/RowSetNavigatorDataChangeMemory
    at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source)
    at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source)
    at org.hsqldb.jdbc.JDBCStatement.fetchResult(Unknown Source)
    at org.hsqldb.jdbc.JDBCStatement.execute(Unknown Source)
    at br.com.caelum.jdbc.Delete.main(Delete.java:14)

Quando tento deletar um registro, usando a seguinte classe:

package br.com.caelum.jdbc;

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

public class Delete {
    public static void main(String[] args) throws SQLException {
        Connection conn = Database.getConnection();
        Statement smtm = conn.createStatement();

        int id=3;
        String query = "delete from Produto where id>3";
        boolean res = smtm.execute(query);

        int updRow=smtm.getUpdateCount();

        System.out.println(updRow);
    }
}

Segue a classe Database:

package br.com.caelum.jdbc;

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

public class Database {
    public static Connection getConnection() throws SQLException {
        Connection connection = DriverManager.getConnection("jdbc:hsqldb:hsql://localhost/loja-virtual", "SA", "");
        return connection;

    }

}