@OneToOne unidirectional and bidirectional

Question

I have two examples that first is @OneToOne unidirectional mapping and second bidirectional. In unidirectional mapping, the owning-side table must contain a join column that

Answer 1

I just had an experiment on this. If you just do this below, both tables will have foreign keys:

@OneToOne
private Address43 address;

@OneToOne
private Customer44 customer;

Now you don't need to do the join. I am not sure if it is a good practice or not. Just make sure if you don't have CASCADES.