src/java.desktop/macosx/classes/com/apple/laf/AquaComboBoxPopup.java

*** 152,164 ****
      @Override
      @SuppressWarnings("serial") // anonymous class
      protected JList<Object> createList() {
          return new JList<Object>(comboBox.getModel()) {
              @Override
              public void processMouseEvent(MouseEvent e) {
                  if (e.isMetaDown()) {
!                     e = new MouseEvent((Component)e.getSource(), e.getID(), e.getWhen(), e.getModifiers() ^ InputEvent.META_MASK, e.getX(), e.getY(), e.getXOnScreen(), e.getYOnScreen(), e.getClickCount(), e.isPopupTrigger(), MouseEvent.NOBUTTON);
                  }
                  super.processMouseEvent(e);
              }
          };
      }
--- 152,170 ----
      @Override
      @SuppressWarnings("serial") // anonymous class
      protected JList<Object> createList() {
          return new JList<Object>(comboBox.getModel()) {
              @Override
+             @SuppressWarnings("deprecation")
              public void processMouseEvent(MouseEvent e) {
                  if (e.isMetaDown()) {
!                     e = new MouseEvent((Component) e.getSource(), e.getID(),
!                                        e.getWhen(),
!                                        e.getModifiers() ^ InputEvent.META_MASK,
!                                        e.getX(), e.getY(), e.getXOnScreen(),
!                                        e.getYOnScreen(), e.getClickCount(),
!                                        e.isPopupTrigger(), MouseEvent.NOBUTTON);
                  }
                  super.processMouseEvent(e);
              }
          };
      }