Have a look at 
http://code.google.com/p/google-web-toolkit/issues/detail?id=5776 and 
related bugs.

Note that the (a bit outdated ¹) docs say:

RequestFactory automatically sends the whole object graph in a single 
request. In this case, the implementation of Person.persist() on the server 
is responsible for persisting the related Address also, which may or may not 
happen automatically, depending on the ORM framework and how the 
relationship is defined.

—* Source: *
http://code.google.com/webtoolkit/doc/latest/DevGuideRequestFactory.html#relationships

¹ outdated because @Embedded are supported since GWT 2.2 through ValueProxy

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