Re: Can an interface serve as proxy for more than one class in RequestFactory?

On Sunday, June 21, 2015 at 9:29:01 PM UTC+2, Aldo wrote:

HI,

I know this is an old thread, but I'm having a similar problem.

I have a class A that is an entity on my server side and a class B that extends A (with PrimaryKeyJoinColumn). So, in other words I have:

@Entity
@Inheritance(strategy=InheritanceType.JOINED)
public class A {
...
}

@Entity
@PrimaryKeyJoinColumn(name="a_id", referencedColumnName="id")
public class B extends A {
...
}

I already have A extending EntityProxy:

@ProxyFor(A.class)
public interface AProxy extends EntityProxy {
...
}

And now I need to map B as an Entity Proxy as well, but I'm getting an exception. What I did is:

@ProxyFor(B.class)
public interface BProxy extends AProxy, EntityProxy {
...
}

but I get the following exception:
BProxy is not an EntityProxy type
    at com.google.web.bindery.requestfactory.shared.impl.IdFactory.asEntityProxy(IdFactory.java:66)

Is it possible to do what I'm trying here? If so, how?

Assuming you get that error on the client side, it actually means that your RequestFactory doesn't know about BProxy.

BProxy has to be referenced from a RequestContext or another EntityProxy/ValueProxy transitively referenced from your RequestFactory interface.

You might have to annotate one of your RequestContext or proxy with @ExtraTypes(BProxy.class).

See http://www.gwtproject.org/doc/latest/DevGuideRequestFactory.html#transportable (search for ExtraTypes there) 

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