Hibernate one to zero or one mapping

I'm trying to map a one to "zero or one" relationship in Hibernate. I think I may have found a way using a many-to-one. class A { private B b; // ... getters and setters } class B { private A a; } Class A's mapping specifies: and Class B's mapping specifies: What I would like is for b to be null when no matching row for B was found in the database. So I can do this (in class A): if (b == null) However, it seems that b is never null. What can I do about this?

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