Question

I have this field:

@Inject(optional=true)
@Named(NAMED_ERROR_HANDLER)
private PolymorphicDispatcher.ErrorHandler<IScope> errorHandler = new PolymorphicDispatcher.NullErrorHandler<IScope>();

and I need to override the default binding (NullErrorHandler). How do I do that?

Answer 1

I don’t have PolymorphicDispatcher.ErrorHandler and sons on board, but this binding should do the job:

bind(new TypeLiteral<PolymorphicDispatcher.ErrorHandler<IScope>>(){})
    .annotatedWith(Names.named(NAMED_ERROR_HANDLER))
    .to(MyImpl.class);

which MyImpl as something like this:

public class MyImpl implements PolymorphicDispatcher.ErrorHandler<IScope> {
    // methods from interface
}

The basic principle is explained here when you search for TypeLiteral. (Sorry, no HTML-ID or anchor near that section).