src/share/classes/java/util/HashMap.java

Print this page 

        
@@ -1210,10 +1210,12 @@
     }
 
     @Override
     public V merge(K key, V value,
                    BiFunction<? super V, ? super V, ? extends V> remappingFunction) {
+        if (value == null)
+            throw new NullPointerException();
         if (remappingFunction == null)
             throw new NullPointerException();
         int hash = hash(key);
         Node<K,V>[] tab; Node<K,V> first; int n, i;
         int binCount = 0;