HSQLDB inmemory mode doesn't delete files on shutdown - hsqldb

Question

I'm using HSQLDB version 2.2.9 for testing purposes.
When I create named in memory database, files aren't deleted after calling shutdown function. On my filesystem I have folder DBname.tmp and files DBname.lck, DBname.log, DBname.properties and DBname.script. As I understand documentation (http://hsqldb.org/doc/2.0/guide/dbproperties-chapt.html#dpc_connection_url) it shouldn't happened.
For testing I'm using the following code:
import java.io.IOException;
import org.hsqldb.Server;
import org.hsqldb.persist.HsqlProperties;
import org.hsqldb.server.ServerAcl.AclFormatException;
import org.junit.Test;
public class HSQLDBInMemTest {
#Test
public void test() throws IOException, AclFormatException {
HsqlProperties props = new HsqlProperties();
props.setProperty("server.database.0", "test1");
props.setProperty("server.dbname.0", "test1");
props.setProperty("server.database.1", "test2");
props.setProperty("server.dbname.1", "test2");
Server hsqlServer = new Server();
hsqlServer.setRestartOnShutdown(false);
hsqlServer.setNoSystemExit(true);
hsqlServer.setProperties(props);
hsqlServer.start();
hsqlServer.shutdown();
}
}

Answer 1

Answered here: http://sourceforge.net/mailarchive/message.php?msg_id=30881908 by fredt
The code should look like:
import java.io.IOException;
import org.hsqldb.Server;
import org.hsqldb.persist.HsqlProperties;
import org.hsqldb.server.ServerAcl.AclFormatException;
import org.junit.Test;
public class HSQLDBInMemTest {
#Test
public void test() throws IOException, AclFormatException {
HsqlProperties props = new HsqlProperties();
props.setProperty("server.database.0", "mem:test1");
props.setProperty("server.database.1", "mem:test2");
Server hsqlServer = new Server();
hsqlServer.setRestartOnShutdown(false);
hsqlServer.setNoSystemExit(true);
hsqlServer.setProperties(props);
hsqlServer.start();
hsqlServer.shutdown();
}
}
The path for a memory database looks like props.setProperty("server.database.0", "mem:test1");