When using generic types in a language like Java, nesting generics is a code smell. That is to say, a type like List> is probably a sign that you've gone off the path and should rethink how you're structuring your program. Similarly, types that depend on more than one or two generic type parameters are probably a code smell as well.

If those are a "code smell" this code Adam S found is a "code sewage treatment plan in dire need of a visit from the Environmental Protection Agency".

public interface VolumeStream<V extends Volume, I> extends BaseVolumeStream<VolumeStream<V, I>, V, I>{

    default  M2 merge(V second, VolumeMergersuper U> merger, M2 destination, VolumeFiller>, GenerationRegion, UnmodifiableBlockVolume

https://thedailywtf.com/articles/crank-the-volume