>From the official GWT documentation:
When querying the server, RequestFactory does not automatically populate
relations in the object graph. To do this, use the with() method on a
request and specify the related property name as a String:
Request<Person> findReq =
requestFactory.personRequest().find(personId).with("address");
It is also necessary to use the with() method to retrieve any properties
with types extending ValueProxy. The with() method takes multiple String
arguments, so you can specify multiple property names at once. To specify
nested properties, use dot notation. Putting it all together, you might have
Request<Person> findReq =
find(personId).with("phone","address.city","address.zip")
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