can't cast to implemented interface

Question

i\'m very confused...

I have a class which directly implements an interface:

public class Device implements AutocompleteResult
{...}

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Answer 1

AKA when Java apparently doesn't Java.

I hit this problem recently with Play Framework 2.6.3, what helped me was this: https://www.playframework.com/documentation/2.6.x/ThreadPools#Application-class-loader

I leave this info here for the people that might have the same problem.

To make it clearer, what helps is:

Injecting Application on an Eager Singleton and then using its classloader to load the classes I was having issues with.

To make it clearer

public class Module {


 @Override
 public void configure {
   bind(TheClassLoaderLoader.class).asEagerSingleton()

public static class TheClassLoaderLoader {
  @Inject
        public TheClassLoaderLoader( Application application) {

         ClassLoader classloader = application.classloader();

                Class interfaceClass = classloader.loadClass(InterfaceClass.class.getName());
                classloader.loadClass(ImplementsInterfaceClass.class.getName()).asSubclass(interfaceClass);

The example here https://playframework.com/documentation/2.6.x/JavaDependencyInjection#Configurable-bindings

That uses Environment often throws a frustrating ClassNotFoundException

Cheers