In all rels there is a Cascade option.
The cascade=CascadeType.ALL option is similar to making the relationship a composite aggregation since when the owner is deleted or persisted, the update will be cascaded down to the aggregated entity.

However, strictly speaking it's not an composite aggregation.
There is no restriction on the number of entities that can have a reference to the composite aggregated object.

For example, say I have an entity Person which composite aggregates an Address entity.

@OneToOne(cascade=CascadeType.ALL)
public Address getHomeAddress() {
return this.address;
}

It is possible for me to create a number of Person entities which have the same Address object.
This is not composite aggregation relationship.
My question is there anyway / annotation a composite relationship can be achieved in Hibernate?

@Embeddable

]Thanks, I got that from the spec alright.
However that only suffices for 1:1, it won't work for 1:M.
that's the way the JPA spec is right now.

@CollectionOfElements will do the job of one to many (Hibernate specific)