On Mon, Apr 15, 2019 at 8:04 PM Christopher Dodunski <
chrisfromtapes...@christopher.net.nz> wrote:
> By creating a ServletContextListener that sets a static ServletContext
> variable in a RegistryProxy class I created, I now have access to the
> Tapestry-IoC registry from anywhere in the application.
Nice!
> However, when I use my custom endpoint Configurator to get an instance of
> ServerEndpoint (implementation) from the registry, it seems that what I
> get back is not castable:
> java.lang.ClassCastException: Cannot cast
> $HarbourServerEndpoint_39c9cc24eb8b2a to
> com.optomus.harbour.services.HarbourServerEndpointImpl
>
It's not castable nor it should. You shouldn't cast to the service
implementation class. Just use the service interface instead. I'd try this:
@Override
public <T> T getEndpointInstance(Class<T> endpointClass) throws
InstantiationException {
return RegistryProxy.getService(endpointClass.class);
}
Why is it even referencing HarbourServerEndpointImpl? This, the service
implementation class, should only be referenced in AppModule (or other
Tapestry-IoC module) when declaring the service and maybe also when making
unit tests. Everything else should use HarbourServerEndpoint instead.
My Configurator method:
>
> @Override
> public <T> T getEndpointInstance(Class<T> endpointClass) throws
> InstantiationException {
> return
> endpointClass.cast(RegistryProxy.getService(HarbourServerEndpoint.class));
> }
>
> My RegistryProxy method:
>
> public static <T> T getService(Class<T> serviceInterface){
> Registry registry =
> (Registry)context.getAttribute(TapestryFilter.REGISTRY_CONTEXT_NAME);
> return registry.getService(serviceInterface);
> }
>
> Incidentally, altering my Configurator method to use old style casting (as
> per below) didn't solve the problem.
>
> @Override
> public <T> T getEndpointInstance(Class<T> endpointClass) throws
> InstantiationException {
> return (T)RegistryProxy.getService(HarbourServerEndpoint.class);
> }
>
> Finally, with no casting at all, the compiler gives the error:
>
> Error:(17, 40) java: incompatible types: inference variable T has
> incompatible bounds
> equality constraints:
> com.optomus.harbour.services.HarbourServerEndpoint
> upper bounds: T,java.lang.Object
>
> Regards,
>
> Chris.
>
>
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>
--
Thiago
