HSQLDB shipped

Hello.

I'm developing a Java application with HSQLDB. When I access the database with absolute path, everything works ok:

String txtCon="jdbc: hsqldb: file: C: /ITA/workplace/hsqldb-2.3.3/hsqldb/db/crudfx";

Then I put the db folder inside my project and I'm trying to access it by relative path:

String txtCon="jdbc: hsqldb: file: db / crudfx";

And it does not work at all ... what am I doing wrong?