Hi,

I'm having trouble creating a one-to-one relationship in an EJB 3 entity bean. I'm trying to create the relationship in a way that both sides will have the same primary key. The tutorial shows how to create the relationship in a way
that each side has their own primary key and the relationship is defined by placing a foreign key on each side.

The tutorial defines the one-to-one relationship between Customer and Address. This is what it looks like in Customer:

@OneToOne(cascade = {CascadeType.ALL})
@JoinColumn(name = "ADDRESS_ID")
public Address getAddress()
{
return address;
}

This code creates a join column on the Customer table which is a foreign key to Address.

In my case, I would like to not have that extra column in the Customer table and have Address use the same primary key as Customer.

The EJB specification shows the following example:

One-to-one association that assumes both the source and target share the same primary key values

@OneToOne(optional=false)
// No join column required
public Customer getCustomer() { return customer; }


I'm not having any success in getting that to work. So far my code looks like this:

In Customer:
@Id(generate = GeneratorType.AUTO)
public Integer getId() {
return id;
}

...

@OneToOne(cascade = {CascadeType.ALL}, optional = false)
public Address getAddress() {
return address;
}


In Address:
@Id(generate = GeneratorType.AUTO)
public Integer getId() {
return id;
}

...

@OneToOne(cascade = {CascadeType.ALL}, optional = false)
public Customer getCustomer() {
return customer;
}

The problem I'm having is that the primary keys on each entity are being generated independently of one another which, given the way I defined the primary keys, makes perfect sense. I feel like it's missing something, though. The question that stays in my head is, how do I define the primary keys for each side of the relationship in a way that the container will manage it and know that both of them must be the same?

I'm thinking this feature might not be implemented but I couldn't find anything that will confirm or deny that. Can anyone help me please?