src/share/classes/java/util/AbstractSet.java

rev 7046 : 4802647: Throw required NPEs from removeAll()/retainAll()
Reviewed-by: mduigou, chegar, dholmes
Contributed-by: Brandon Passanisi <brandon.passanisi@oracle.com>

@@ -164,10 +164,11 @@
      *         or if the specified collection is null
      * @see #remove(Object)
      * @see #contains(Object)
      */
     public boolean removeAll(Collection<?> c) {
+        Objects.requireNonNull(c);
         boolean modified = false;
 
         if (size() > c.size()) {
             for (Iterator<?> i = c.iterator(); i.hasNext(); )
                 modified |= remove(i.next());