RequestFactory, ServiceLocator and Spring

I am trying to find a good solution to integrate the RequestFactory
with Spring. I implemented this ServiceLocator (no exception handling
included for simplicity):

public class SpringServiceLocator implements ServiceLocator {

@Override
public Object getInstance(Class<?> clazz) {
HttpServletRequest request =
RequestFactoryServlet.getThreadLocalRequest();
ApplicationContext context =
WebApplicationContextUtils.getWebApplicationContext(request.getSession().getServletContext());
return context.getBean(clazz);
}
}

I annotate my RequestContext with the GWT @Service annotation (not the
Spring one). Example below:

@Service(locator = SpringServiceLocator.class, value =
AddressService.class)
public interface AddressRequest extends RequestContext {
// Get address by id
Request<AddressProxy> get(Long id);
}

When I fire the Address request using RequestFactory, the
SpringServiceLocator locates the AddressServiceImpl.class and returns
an instance. The method "public Address get(Long id)" is called and
returns a new instance of an Address object.

So it works... but is there a better way? Is the lookup in
getInstance() to slow, could anything be cached, etc. Any input is
welcome.

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