RequestFactory sending EntityProxy in request parameters

Hello,
I have a problem using request factory while sending a user proxy
object in the request method parameters.

My code for the UserProxy:

@ProxyFor(value = User.class, locator = UserLocator.class)
public interface UserProxy extends EntityProxy {
...
}

@Service(value = UserDao.class, locator = MyServiceLocator.class)
public interface UserRequest extends RequestContext {
...
}

And for the StuffProxy:

@ProxyFor(value = Stuff.class, locator = StuffLocator.class)
public interface StuffProxy extends EntityProxy {
...
}

@Service(value = StuffDao.class, locator = MyServiceLocator.class)
public interface StuffRequest extends RequestContext {
Request<List<StufftProxy>> getStuff(UserProxy user);
}

When i call getStuff() i get

2011-06-05 12:07:52
com.google.gwt.requestfactory.server.ServiceLayerDecorator die
SEVERE: Could not find static method with a single parameter of a key
type

It seems that no UserLocator is used when exiting from the server side
getStuff method.
Passing a null object works fine.

What can be the problem?

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