Criei uma classe chamada ConnectionPool da seguinte forma:

package br.com.robson.jdbc;

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

import javax.sql.DataSource;

import org.hsqldb.jdbc.JDBCPool;

public class ConnectionPool {

    private DataSource dataSource;

    public ConnectionPool() {

        JDBCPool pool = new JDBCPool();
        pool.setURL("jdbc:hsqldb:hsql://localhost/loja-        virtual");
        pool.setUser("SA");
        pool.setPassword("");
        this.dataSource = pool;

    }


    public Connection getConnection() throws SQLException {


        Connection connection = dataSource.getConnection();
        return connection;
    }    

}

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Esta dando o seguinte erro : (OBS: O banco está rodando, não está stopado.)

Exception in thread "main" java.lang.NullPointerException
    at org.hsqldb.DatabaseURL.parseURL(Unknown Source)
    at org.hsqldb.jdbc.JDBCDriver.getConnection(Unknown Source)
    at org.hsqldb.jdbc.pool.JDBCPooledDataSource.getPooledConnection(Unknown Source) (<=========== UNKNOWSOURCE ???????)
    at org.hsqldb.jdbc.JDBCPool.getConnection(Unknown Source)
    at br.com.robson.jdbc.ConnectionPool.getConnection(ConnectionPool.java:31)
    at br.com.robson.main.TestaConexao.main(TestaConexao.java:16)

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Pergunta: Porque está dando UNkNOWSOURCE ????