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

@@ -266,10 +266,11 @@
             }
         }
         return list;
     }
 
+    @SuppressWarnings("deprecation")
     public boolean isPopupTrigger(MouseEvent e) {
         return ((e.getID()==MouseEvent.MOUSE_RELEASED)
                 && ((e.getModifiers() & MouseEvent.BUTTON3_MASK)!=0));
     }