src/share/classes/java/util/TreeMap.java

rev 7932 : 8021591: Additional explicit null checks
Reviewed-by: psandoz, martin, alanb

@@ -1010,11 +1010,11 @@
     public void replaceAll(BiFunction<? super K, ? super V, ? extends V> function) {
         Objects.requireNonNull(function);
         int expectedModCount = modCount;
 
         for (Entry<K, V> e = getFirstEntry(); e != null; e = successor(e)) {
-            e.value = Objects.requireNonNull(function.apply(e.key, e.value));
+            e.value = function.apply(e.key, e.value);
 
             if (expectedModCount != modCount) {
                 throw new ConcurrentModificationException();
             }
         }