complicate generic infer error

[951mmm]

my generic function:

public static <K, V> V getOrCreate(Map<K, V> map, K k, Supplier<? extends V> supplier)

my expression:

MapUtil.getOrCreate(MapUtil.getOrCreate(map, dt.getYear(), HashMap::new), dt.getMonthOfYear(), ArrayList::new).add(dt.getDayOfMonth());

my error:

[rgrunber]

I'm assuming dt is java.util.Date but what is map ?