@OneToOne(propertyName) - referenced object uses one-to-one relation, propertyName is referenced entity's property to join with current entity's primary key.
@OneToOne or @OneToOne() - referenced object uses one-to-one relation, requires additional @JoinColumn annotation to specify foreign key column in current entity to join with current entity's primary key.
@OneToOne(propertyName) - referenced object uses one-to-one relation, propertyName is referenced entity's property to join with current entity's primary key. @OneToOne or @OneToOne() - referenced object uses one-to-one relation, requires additional @JoinColumn annotation to specify foreign key column in current entity to join with current entity's primary key.