Building samples on oracle 9i - cannot resolve symbol

I have successfully run and built the sample application from a mysql 
database (as I'm more familiar with that).  Then decided to move to Oracle 
to do the same. I'm running building on a windows platform accessing an 
oracle 9i database using the ojdbc14.jar drivers, and Middlegen 2.1.

The Middlegen task completed, then the XDoclet stage created classes, but 
the compilation stage failed. With the following:
compile-ejb:
    [javac] Compiling 53 source files to 
C:\programming\middlegen-2.1\samples\build\classes
    [javac] 
C:\programming\middlegen-2.1\samples\build\gen-src\airline\ejb\PersonBean.java:261: 
cannot resolve symbol
    [javac] symbol  : variable reservations
    [javac] location: class airline.ejb.PersonBean
    [javac]       setReservations(reservations);
    [javac]                       ^
    [javac] 1 error

I've not found the same error in the archive, but I don't think I deviated 
from the guide, because I carried it out successfully with mySQL.

Can anybody shed some light?

Thanks