GWT RequestFactory: inheriting interfaces into a RequestContext

I have my OrganizationRequestContext interface, which works great:

@Service(OrganizationDAO.class)
public interface OrganizationRequestContext extends RequestContext
{
    Request<OrganizationProxy> findOrganization(Long id);

    InstanceRequest<OrganizationProxy, Void> persist();
    InstanceRequest<OrganizationProxy, Void> remove();
}

Now I want to take those last two functions and put them in a PersistentRequestContext of my own design so that I can treat all of my RequestContexts the same in my client code:

public interface PersistableRequestContext<T extends BaseProxy>
{
    InstanceRequest<T, Void> persist();
    InstanceRequest开发者_开发百科<T, Void> remove();
}

...

@Service(OrganizationDAO.class)
public interface OrganizationRequestContext extends RequestContext, PersistentRequestContext<OrganizationProxy>
{
    Request<OrganizationProxy> findOrganization(Long id);
}

But this fails validation: the server complains that

[ERROR] com.activegrade.shared.data.PersistableRequestContext is not a RequestContext

If I make PersistableRequestContext extend RequestContext, then the server complains that it is not linked to any particular DAO service.

Is there any way to extend a common interface besides RequestContext in my various RequestContext interfaces?

This issue has been fixed in GWT 2.4. Thanks Google!

http://code.google.com/p/google-web-toolkit/issues/detail?id=6035