src/java.desktop/share/classes/javax/swing/plaf/basic/BasicPopupMenuUI.java

*** 266,275 ****
--- 266,276 ----
              }
          }
          return list;
      }
  
+     @SuppressWarnings("deprecation")
      public boolean isPopupTrigger(MouseEvent e) {
          return ((e.getID()==MouseEvent.MOUSE_RELEASED)
                  && ((e.getModifiers() & MouseEvent.BUTTON3_MASK)!=0));
      }