Entity with @OneToOne relationship with Entity in another spring-data-rest service [DATAREST-1272]

Farrukh Najmi opened DATAREST-1272 and commented

Please see issue described here.
 
In my spring-data-rest application I have the following entities:

@Entity
public class com.foo.client.Foo {
@Id
@Column(name = "id", nullable = false, length = 48)
public String id = UUID.randomUUID().toString();

@OneToOne
public Bar bar;        

}

@Entity
public class Bar {
@Id
@Column(name = "id", nullable = false, length = 48)
public String id = UUID.randomUUID().toString();

public String name;        

}
I have JpaRepository for each entity class:
@RepositoryRestResource(collectionResourceRel = "foos", path = "foos")
public interface FooRepository extends JpaRepository<Foo, String> {
}

@RepositoryRestResource(collectionResourceRel = "bars", path = "bars")
public interface BarRepository extends JpaRepository<Bar, String> {
}
I create an instance for both Foo and Bar using:
curl -i -X PUT -H "Content-Type:application/json"
-d '{"id": "urn:foo:test:0"}' http://localhost:8000/foos

curl -i -X PUT -H "Content-Type:application/json"
-d '{"id": "urn:bar:test:0", "name" : "0"}' http://localhost:8000/bars

I then associate the Bar instance to the Foo instance using:
curl -i -X PUT -d "http://localhost:8000/bars/urn:bar:test:0\n"
-H "Content-Type:text/uri-list" "http://localhost:8000/foos/urn:foo:test:0/bar"

When the two entities are defined in the same spring-data-rest service endpoint then all is well and I can get the bar instance associated with the foo instance using:
 curl -i -X GET -H "Content-Type:application/json" "http://localhost:8000/foos/urn:foo:test:0/bar"
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Question: Looking at the postgresdb where entities are stored I see an association table FOO_BAR where there are two columns holding the id of each entity. However, I do not see where the URL for bar is stored and would like to understand where it is stored.

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Now if I split my app into two separate spring-data-rest services one foo-service for Foo and another bar-service for bar at separate ports, and also split the Repository classes between two project, then creating the association does not work and I get a 404. See modified code below:

I create an instance for both Foo and Bar using:
curl -i -X PUT -H "Content-Type:application/json"
-d '{"id": "urn:foo:test:0"}' http://localhost:8000/foos

curl -i -X PUT -H "Content-Type:application/json"
-d '{"id": "urn:bar:test:0", "name" : "0"}' http://localhost:8001/bars
{{
I then associate the Bar instance to the Foo instance using:

}}
curl -i -X PUT -d "http://localhost:8001/bars/urn:bar:test:0\n"
-H "Content-Type:text/uri-list" "http://localhost:8000/foos/urn:foo:test:0/bar"
 

This last request above gives me a 404 when Foo and Bar are managed by different spring-data-rest services.

How can I get the second case to work?

Note I used this excellent resource for my example.

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No further details from DATAREST-1272