How to use fetch='join' in Hibernate?

Question

I encountered a problem on usering Hibernate. Table A one-to-one Table B and Table A one-to-one Table C.Now I use the method get(A.class, id), but Hibernate generate two sql:the first one a join b, the second is "select c" when use the property c in a, That is fetch="join" is fail in a and c, Who can help me find the reason？

Answer 1

from Cat as cat
inner join cat.mate as mate
left outer join cat.kittens as kitten

More examples here