Well, I have read the document about Entity Proxy http://code.google.com/webtoolkit/doc/latest/DevGuideRequestFactory.html . As far as I understood Entity Proxy does not support transparently calling of lazy loaded entity relations. Such as, I have Employee entity, and this entity has supervisor field whose type is Employee, and this field fetch type is lazy.. When I have queried an employee, can I call its getSupervisor method at GWT layer?.. What I expect EmployeeProxy calls transparently getSupervisor method of Employee entity on the server.. Is this the case?.
No, just as you mention it doesn't support lazy loading. It would also be difficult, because while you want to do a getSupervisor(), which would return the data, in practice this would mean GWT performs an asynchronous call, and needs a receiver. Technically, it might be be possible to implement something like lazy loading, but due to the asynchrony it would never be possible to simple do a getSupervisor().