When using dynamic instantiation, does each property in the data-transfer have to equate to a column?

Goal: Count an item's bids by bidder
HQL: select new BidSummary ( item.bidder , count(*) ) from Item item where ...
BidSummary class has contructor BidSummary(Bidder bidder, int bids)


With this I get an error "unable to locate appropriate constructor on class [BidSummary]


As a test, I changed the count(*) to an integer column and that works, though not the results I wanted. ;-)


So far none of the examples (Hibernate in Action book, this forum, google) I've come across use an aggregate function. :-(

Thanks!

Actually, the book has an example using count() and avg() in section 7.4.4 Restricting groups with having.

The fix is in the BidSummary constructor (just like the error suggested ;-).
I had BidSummary(Bidder, Integer).
It should've been BidSummary(Bidder, Long).