GraphqlResolver defined out of GenericTypes not supported.

[abhi-rao]

The below use case is supported.

   abstract class FooResolver<T> implements GraphQLResolver<Bar> {
        String getValue(T foo) {
            return "value"
        }
    }

    class BarResolver extends FooResolver<Bar> {

   }

But the following way is not supported. Fails with
Caused by: com.coxautodev.graphql.tools.ResolverError: Unable to determine data class for resolver 'com.coxautodev.graphql.tools.SuperclassResolverSpec$BarResolver' from generic interface! This is most likely a bug with graphql-java-tools.

    abstract class FooResolver<T> implements GraphQLResolver<T> {
        String getValue(T foo) {
            return "value"
        }
    }

    class BarResolver extends FooResolver<Bar> {

   }

    class CarResolver extends FooResolver<Car> {

   }

Though the same approach can be supported currently, but it has duplicated code that can be made cleaner as proposed earlier.

    abstract class FooResolver<T> {
        String getValue(T foo) {
            return "value"
        }
    }

    class BarResolver extends FooResolver<Bar> implements GraphQLResolver<Bar>  {

    }

    class CarResolver extends FooResolver<Car> implements GraphQLResolver<Car> {

    }