GWT Request Factories and Spring Services

Hello,

The French book entitled "Programmation GWT 2.0, 2e édition" (ie, "GWT 2.0
Programming, 2nd Edition") contains a chapter on the Request Factory API, which
describes a skeleton GWT application containing Entities (eg, Employee class on
the server side), Proxies (eg, EmployeeProxy on the server side?), Request
Factories (eg, EmployeeRequestFactory on the client side), Services (eg,
EmployeeService on the server side), Locators (eg, EmployeeServiceLocator, on
the server side?), and Spring Services (eg, MySpringEmployeeServiceLocator).
Unfortunately, the author does not spend too much time on the latter subject,
because he probably takes it for granted that readers have sufficient knowledge
to develop fully-fledged Spring Services to retrieve data from a database and
feed them to his skeleton application.

Unfortunately, I don't have that knowledge. I know how to develop a basic Spring
Service using Eclipse, but that's about it.

Can someone tell me what the Service should do to feed data retrieved from a
database, to the Request Factories mentioned above?

Many thanks.

Philroc