src/share/classes/java/util/Hashtable.java

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

@@ -1018,10 +1018,12 @@
         return false;
     }
 
     @Override
     public synchronized boolean replace(K key, V oldValue, V newValue) {
+        Objects.requireNonNull(oldValue);
+        Objects.requireNonNull(newValue);
         Entry<?,?> tab[] = table;
         int hash = hash(key);
         int index = (hash & 0x7FFFFFFF) % tab.length;
         @SuppressWarnings("unchecked")
         Entry<K,V> e = (Entry<K,V>)tab[index];

@@ -1038,10 +1040,11 @@
         return false;
     }
 
     @Override
     public synchronized V replace(K key, V value) {
+        Objects.requireNonNull(value);
         Entry<?,?> tab[] = table;
         int hash = hash(key);
         int index = (hash & 0x7FFFFFFF) % tab.length;
         @SuppressWarnings("unchecked")
         Entry<K,V> e = (Entry<K,V>)tab[index];