Java Database Connectivity (JDBC)

I am trying to connect to an Access database using the hsqldb drivers but i keep getting the error that no user is found can anyone help PLEASE??? im pretty new to JDBC.

Driver d = (Driver)Class.forName("org.hsqldb.jdbcDriver").newInstance();
String URL = "jdbc:hsqldb:"+"db2";
dbConn = DriverManager.getConnection(URL, "nouser", "nopassword");
System.out.println("db Connected...\n");