In Java Persistence with Hibernate Charpter14 p660

The correlated subquery is:
from User u where 10 < (
select count(i) from u.items i where i.successfulBid is not null
)

I modify the correlated nesting example like these:
from User u where 10 < (
select count(i) from u.items i where i.successfulBid.successful= true
)

When I test it with Hibernate Tools 3.3.1 in Eclipse Galileo SR2,it report that :
Error
Sun Aug 15 05:27:37 CST 2010
org.hibernate.QueryException: could not resolve property: items of: auction.model.User [from auction.model.User u where 10 < (
select count(i) from u.items i where i.successfulBid.successful= true
)]

How to fix it, can anyone give me some clues?

send the code. may be configuration is missing.