polymorphism is still broken in 2.4 RC1

[Y2i]

Found another issue with 2.4 RC1.  It seems that polymorphism is still broken.

interface A extends EntityProxy { ... }

interface B extends A { ... }

interface C extends A { ... }

interface D {

  A getA();

}

interface S extends RequestContext {

  RequestContext<List<D>> queryDs();

}

The service is called correctly, and returns the correct results, but the client fails when it receives a response:

generated class:  SImpl(AbstractRequestContext).createProxy(Class<T>, SimpleProxyId<T>) line: 489

failing method:    public <T extends BaseProxy> AutoBean<T> createProxy(Class<T> clazz, SimpleProxyId<T> id)

Line 489:  throw new IllegalArgumentException("Unknown proxy type " + clazz.getName());

Messages:  "Unknown proxy type B", "Unknown proxy type C"

Note that this code worked fine in GWT 2.2.

[Y2i]

Submitted an issue: http://code.google.com/p/google-web-toolkit/issues/detail?id=6700

[Jens]

Just tried it and it works for me in 2.4 RC 1.

Make sure you have @ProxyFor annotations on all proxy interfaces or use @ExtraType annotation.

[Y2i]

Thanks so much, I really appreciate you pointing out @ExtraType attribute.  It solved all my migration problems.