Java

Yeah, this is an example I talked about in another comment here but I can be more concrete. This and code like it is why I usually wondered why erasure happens at all. In the Jackson framework to convert JSON to a class you pass in the type like MyClass.class but because you can't pass in parameters you'd have to do List.class. Jackson has this method to handle such situations. It uses the TypeReference class which takes advantage of Java storing type parameters for anonymous classes. The Javadoc for that class mentions this blog which is sort of the de facto source for getting around this limitation. Essentially the code you write is like this,

readValue(someJson, new TypeReference<List<Integer>> {});

You make a new, anonymous implementation of TypeReference<T> and T is known at runtime.

I haven't looked into why Jackson has to do it that way but my best guess is the proper way would be inconvenient.