HSQL embedded

Estou tentando utilizar o sgbd HSQL DB embedded em uma aplicação desktop. Pesquisei um pouco e encontrei a seguinte classe:

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

import org.hsqldb.Server;

public class HSQLDB_tool {

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

// 'Server' is a class of HSQLDB representing
// the database server

 Server hsqlServer = null;
 try {
 hsqlServer = new Server();

 // HSQLDB prints out a lot of informations when
 // starting and closing, which we don't need now.
 // Normally you should point the setLogWriter
 // to some Writer object that could store the logs.
 hsqlServer.setLogWriter(null);
 hsqlServer.setSilent(true);

 // The actual database will be named 'xdb' and its
 // settings and data will be stored in files
 // testdb.properties and testdb.script
 hsqlServer.setDatabaseName(0, "xdb");
 hsqlServer.setDatabasePath(0, "file:testdb");

 // Start the database!
 hsqlServer.start();

 Connection connection = null;
 // We have here two 'try' blocks and two 'finally'
 // blocks because we have two things to close
 // after all - HSQLDB server and connection
 try {
 // Getting a connection to the newly started database
 Class.forName("org.hsqldb.jdbcDriver");
 // Default user of the HSQLDB is 'sa'
 // with an empty password
 connection = DriverManager.getConnection(
 "jdbc:hsqldb:hsql://localhost/xdb", "sa", "");

 // Here we run a few SQL statements to see if
 // everything is working.
 // We first drop an existing 'testtable' (supposing
 // it was there from the previous run), create it
 // once again, insert some data and then read it
 // with SELECT query.
 // connection.prepareStatement("drop table testtable;").execute();
 connection.prepareStatement(
 "create table testtable ( id INTEGER, "
 + "name VARCHAR);").execute();
 connection.prepareStatement(
 "insert into testtable(id, name) "
 + "values (1, 'testvalue');").execute();
 ResultSet rs = connection.prepareStatement(
 "select * from testtable;").executeQuery();

 // Checking if the data is correct
 rs.next();
 System.out.println("Id: " + rs.getInt(1) + " Name: "
 + rs.getString(2));
 } finally {
 // Closing the connection
 if (connection != null) {
 connection.close();
 }

 }
 } finally {
 // Closing the server
 if (hsqlServer != null) {
 hsqlServer.stop();
 }
 }
	}

}

O problema é q toda vez q executo a classe, ele "cria" um novo banco e as informações inseridas nele são perdidas.Alguem pode me ajudar?