src/share/classes/java/util/AbstractCollection.java

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

*** 366,375 ****
--- 366,376 ----
       *
       * @see #remove(Object)
       * @see #contains(Object)
       */
      public boolean removeAll(Collection<?> c) {
+         Objects.requireNonNull(c);
          boolean modified = false;
          Iterator<?> it = iterator();
          while (it.hasNext()) {
              if (c.contains(it.next())) {
                  it.remove();
*** 399,408 ****
--- 400,410 ----
       *
       * @see #remove(Object)
       * @see #contains(Object)
       */
      public boolean retainAll(Collection<?> c) {
+         Objects.requireNonNull(c);
          boolean modified = false;
          Iterator<E> it = iterator();
          while (it.hasNext()) {
              if (!c.contains(it.next())) {
                  it.remove();