Answer by Federico klez Culloca for no instance(s) of type variable(s) K, V exist so that Map conforms to HashMap

Map.of doesn't return a HashMap, it returns an unmodifiable map (what type that is exactly is implementation-dependent and not important), so you can't assign it to a HashMap.

You can work around that by using the HashMap's constructor that accepts (and makes a copy of) another map as an argument.

HashMap<String, String> hashMap = new HashMap<>(Map.of("name", "Murife"));