Doubt on @OneToOne bi-directional

[Joe Harry]

What happens when we do not say optional = "false" in the OneToOne definition as below @OneToOne(mappedBy="billingInfo", optional="false");

[Sergio Tridente]

The optional attribute is a hint used for schema generation. In the case we are talking about, the inverse (non-owning) side of a OneToOne association, my guess is that this attribute is ignored.
[ September 01, 2008: Message edited by: Sergio Tridente ]

[S Bhanage]

Hi,

The default value of optional is "true"
which implies that property can take null values while persistence.

If we explicitely specifies optional = "false"
This means we do not want to persist 'Null' value for this perticular property.

You can refer EJB 3 spec for more details.