Bidirectional OneToOne relationship in JPA-RS not traversable - jpa

Question

I use the simple entities below for exploring jpa-rs:
#Entity
public class Employee {
#Id
#GeneratedValue
private int id;
private String name;
#OneToOne
private Address address;
}
#Entity
public class Address {
#Id
#GeneratedValue
private int id;
private String street;
private String city;
#OneToOne(mappedBy = "address")
private Employee employee;
}
Creating an Employee entity with an Address relation works like a charm:
{
"name": "John Doe",
"address": {
"street": "Street No. 1",
"city": "A City"
}
}
But i cannot travers the resulting objects by the _links, like HATEOAS proposes.
The provided students example in the Eclipselink wiki (http://wiki.eclipse.org/EclipseLink/Examples) allows this easily.
As far as i understand, i should be able to do the following:
fetch the employee with id 1: GET url/entity/Employee/1: {
"id": 1,
"name": "John Doe",
"_relationships": [
{
"_link": {
"href": "url/entity/Employee/1/address",
"rel": "address"
}
}
],
"address": {
"_link": {
"href": "url/entity/Address/2",
"method": "GET",
"rel": "self"
}
},
"staff": []
}
fetch the address of the employee: GET url/entity/Address/2:{
"city": "A City",
"id": 2,
"street": "Street No. 1",
"_relationships": [
{
"_link": {
"href": "url/entity/Address/2/employee",
"rel": "employee"
}
}
]
}
Now lets get back to the employee from here: GET url/entity/Address/2/employee -> http status 400
In the mentioned example i can flawlessly navigate using all the links for the relationship.
p.s.: I'd like to tag this JPA-RS, but i don't have enough reputation to create a new tag.