Java generics TypeReference for collection method not working

I have three classes in play here:

public class MyClass1<T, ID> {

  @Getter
  private static class IdHolder<ID> {
    private ID id;
  }
}

public class MyClass2<T> {
   public MyClass2(Class<? extends T> type) {
   }

   public List<T> fetch() {
   }
}

Inside of MyClass1, I need to create an instance of MyClass2 and call the fetch() method:

List<IdHolder<ID>> previous = new MyClass2<IdHolder<ID>>(???).fetch();

If I use raw types like this:

List<IdHolder> previous = new MyClass2<>(IdHolder.class).fetch();

It does work, but then IntelliJ complains about me using raw types (obviously).

I have tried:

TypeReference<IdHolder<ID>> t = new TypeReference<IdHolder<ID>>() {};

What can I put in ??? to get the class type for IdHolder<ID> or is that just not possible due to type erasure and I have to use raw types? I thought that was the whole point of TypeReference.

>Solution :

is that just not possible due to type erasure and I have to use raw types?

That’s correct, it is not possible. You will have to use raw types.